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Tu m bl e d ryers for com m erci al u se – M e th od s for m eas u ri n g th e pe rform an ce
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I E C P AS 63 1 2 4
®
Edition 1 .0 201 7-06
P U B LI C LY AVAI LAB LE
S P E C I F I C ATI ON
P RE -S TAN D ARD
colour
i n sid e
Tu m bl e d ryers for com m erci al u se – M e th od s for m eas u ri n g th e pe rform an ce
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.060
ISBN 978-2-8322-451 9-4
Warn i n g ! M ake s u re th a t you ob tai n ed th i s p u b l i cati on from an au th ori zed d i stri b u tor.
® Registered trademark of the International Electrotechnical Commission
–2–
I EC PAS 631 24: 201 7 © I EC 201 7
CONTENTS
FOREWORD . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... . .. .. ... ... ... ... ... ... ... ... .. 6
1
Scope .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . 8
2 Norm ative references . ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... . 8
3 Terms, definitions and sym bols... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... 8
3. 1
Terms and definitions . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... . .. .. 8
3. 2
List of sym bols ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. . ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. 1 1
4 Requirements ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... . 1 2
4. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 1 2
4. 2
Rated capacity ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... .. . ... ... .. 1 3
4. 3
Dim ensions ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . 1 3
5 Test conditions, m aterials, equipment and instrum entation .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... . 1 3
5. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 1 3
5. 2
Ambient conditions.. ... ... ... ... ... ... ... ... ... .. ... ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... 1 4
5. 2. 1
Electricity supply ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... . .. ... ... ... ... ... ... ... ... .. ... ... ... ... 1 4
5. 2. 2
Water supply . ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... .. 1 4
5. 2. 3
Ambient tem perature and hum idity ... ... ... ... ... .. ... ... ... ... ... ... ... ... . .. ... ... ... ... ... .. ... . 1 5
5. 3
Test materials . ... ... ... ... ... ... ... ... ... ... ... ... ... . . ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. 1 5
5. 3. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 1 5
5. 3. 2
Test load .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . 1 5
5. 3. 3
Detergent . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . 1 6
5. 4
Equipm ent . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . .. ... . 1 6
5. 4. 1
Equipm ent for normalization .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... .. 1 6
5. 4. 2
Equipm ent for conditioning the test load .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... . 1 6
5. 4. 3
Equipm ent for wetting the test load prior to a test ... ... ... ... ... ... ... ... ... .. ... ... ... ... . 1 6
5. 4. 4
Equipm ent for measurem ent . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 1 6
5. 5
I nstrumentation and accuracy . ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... .. 1 7
6 Preparation for testing ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . .. ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... .. 1 7
6. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 1 7
6. 2
Test specifications from manufacturers .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... . 1 8
6. 3
I nstallation of the tumble dryer ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... ... ... ... ... ... ... .. 1 8
6. 4
Preparation of the tumble dryer for a test series .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... 1 8
6. 5
Preparation of the tumble dryer for a test run . ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... .. . ... ... .. 1 8
6. 6
Preparation of test loads ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. ... ... ... ... ... ... ... ... ... ... ... ... .. .. 1 9
6. 6. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 1 9
6. 6. 2
Pre-treatm ent of new test load item s prior to use .. ... ... .. ... ... ... ... ... ... ... ... ... ... ... 1 9
6. 6. 3
Requirem ents regarding the age of test load item s . ... ... ... ... ... ... ... ... .. ... ... ... ... . 1 9
6. 6. 4
Normalization of test load item s .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... ... ... .. 1 9
6. 6. 5
Conditioning of test load item s . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 20
6. 6. 6
Test load com position . ... ... ... ... ... ... ... ... ... ... ... ... .. . ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... 20
6. 6. 7
Wetting ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. . ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... . 22
7 Perform ance m easurements – General requirem ents . ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... .. 23
8 Tests for perform ance. ... ... ... ... .. ... ... ... ... ... ... ... ... . .. ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... .. . ... ... .. 24
8. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 24
8. 2
Test procedure for perform ance tests ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . .. ... ... ... .. ... ... ... . 24
8. 2. 1
Test conditions, materials and preparation for testing .. ... ... ... ... ... ... ... ... ... ... ... . 24
8. 2. 2
Programm e .. ... ... ... ... ... ... ... .. ... ... ... ... ... . .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... . 24
I EC PAS 631 24:201 7 © I EC 201 7
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8. 2. 3
Test load .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . 25
8. 2. 4
Test procedure . ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. 25
8. 2. 5
Validity of a test run .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... . . ... ... ... ... ... ... ... ... ... ... ... ... ... 25
8. 2. 6
Validity of a test series .. ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... .. . ... ... ... ... .. ... ... ... ... ... . 25
8. 3
Measurem ents to determ ine water and energ y consum ption and programm e
time . ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... ... 26
8. 3. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 26
8. 3. 2
Procedure . ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . 26
8. 4
Measurem ents to determ ine condensation efficiency .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... . 26
8. 4. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 26
8. 4. 2
Procedure . ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . 27
8. 5
Measurem ents to determ ine exhaust air volume .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... 27
8. 6
Perform ance m easurement at m axim um exhaust duct pressure . ... ... ... ... ... ... ... ... ... 27
8. 7
Measurem ent of the textile drying temperature .. ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... .. 27
9 Assessm ent of performance .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... 27
9. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 27
9. 2
Final moisture content of the load .. ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... .. . ... ... ... ... ... ... ... 28
9. 3
Total energ y .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... . .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... .. . ... ... ... . 28
9. 4
Corrected energy . ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 28
9. 5
Corrected water consumption .. ... .. ... ... ... ... ... ... ... ... ... ... .. . ... ... ... ... .. ... ... ... ... ... ... ... ... .. 29
9. 6
Corrected program me time ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... .. . ... ... ... ... ... ... ... ... ... ... ... .. .. 29
9. 7
Condensation efficiency .. ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 30
9. 8
Evaporation capacity .. ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 31
9. 9
Exhaust air volum e . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 31
1 0 Data to be reported... ... ... ... ... ... ... ... ... ... ... .. ... ... .. . ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... . 31
Annex A (normative) Reference list .. ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. 32
A. 1
Reference detergent .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 32
A. 2
Specification of test load . ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... . .. ... ... ... ... ... .. ... ... ... ... ... ... ... . 32
A. 3
The bone dry m ethod of conditioning ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... ... . 32
A. 4
Uncertainty of m easurem ent ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... . .. .. ... ... ... ... ... ... ... ... .. 32
A. 5
Environm ental aspects of tumble dryer use . ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . . ... ... ... .. 32
A. 6
Source of materials and supplies . ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... 32
A. 7
Washing machine for norm alization ... ... ... ... ... ... ... ... ... ... ... ... . .. .. ... ... ... ... ... ... ... ... ... ... 32
Annex B (normative) Exhaust ducts for tum ble dryer testing ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . 33
B. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 33
B. 2
Specification of the exhaust duct type 1 . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... . 33
B. 2.1
Duct material . ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. 33
B. 2.2
The form of the duct . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. ... ... ... ... ... ... ... ... ... ... ... 33
B. 2.3
I nstrumentation . ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. 34
B. 3
Exhaust duct type 2 ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... . .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... 34
B. 3.1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 34
B. 3.2
Specification of exhaust duct Type 2... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . 34
B. 3.3
Setting the correct exhaust duct pressure .. ... ... ... ... ... ... ... .. ... ... ... ... ... .. . ... ... ... .. 34
Annex C (inform ative) Flow diagrams . ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 38
Annex D (norm ative) Test report – Data to be reported . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... .. 41
Annex E (normative) Procedure to determine test load size where rated capacity is not
declared.. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... ... ... .. 45
E. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 45
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I EC PAS 631 24: 201 7 © I EC 201 7
E. 2
Determination of the volum e of the clothes container .. ... ... ... ... ... ... ... .. ... ... ... ... ... ... . 45
E. 3
Determination of the test load . ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... .. 45
Annex F (norm ative) Flexible initial m oisture content method .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. . 46
F.1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 46
F.2
Procedure .. ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... . 46
F.3
Evaluation ... .. ... ... ... ... ... ... ... ... ... ... ... .. . ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . 46
Annex G (norm ative) Performance testing of steam heated tum ble dryers . ... ... ... ... ... ... ... ... ... 48
G.1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 48
G.2
Types of steam heating – Steam heated tum ble dryers . ... ... ... ... ... ... ... ... ... ... ... ... ... . 48
G.3
Specification of steam properties ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... 48
G. 3. 1
Type of steam ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... . .. ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. 48
G. 3. 2
Steam generator . ... ... ... ... ... ... ... ... ... ... .. ... ... .. . ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 48
G.4
Equipm ent and instrumentation .. .. ... ... ... ... ... ... ... ... ... ... . .. ... ... ... ... .. ... ... ... ... ... ... ... ... .. 48
G. 4. 1
Test equipm ent for m easuring the characteristics of steam ... ... ... .. ... ... ... ... ... .. 48
G. 4. 2
I nstruments ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... .. 49
G.5
I nstallation . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... . .. ... . 49
G. 5. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 49
G. 5. 2
I nstallation of the m easurem ent equipment for indirect steam heated
tum bler dryers.(Alternative 1 ) .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... ... ... .. 49
G. 5. 3
I nstallation of the m easurem ent equipment for indirect steam heated
tum ble dryers. (Alternative 2) . ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. 51
G.6
Preparation for testing . ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 52
G. 6. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 52
G. 6. 2
I ndirect heated tum ble dryer installed according to Alternative 1 .. ... ... ... ... ... ... 52
G. 6. 3
I ndirect heated tum ble dryer installed according to alternati ve 2 .. ... ... ... ... ... ... 53
G.7
Tests for perform ance .. ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . 53
G. 7. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 53
G. 7. 2
Performance testing of indirect steam heated tum ble dryer installed
according to alternative 1 ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... . 53
G. 7. 3
Performance testing of indirect heated tumble dryers installed according
to Alternative 2 . ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... .. 53
G.8
Assessm ent of performance . ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. 54
G. 8. 1
General .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... . .. . 54
G. 8. 2
Evaluation of performance of indirect heated tum ble dryer installed
according to alternative 1 ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... . 54
G. 8. 3
Evaluation of performance of indirect heated tumbler dryers installed
according to alternative 2 ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... . 55
G. 8. 4
Evaluation of total energy supplied to the tum bler dryer by steam ... ... ... ... ... ... 55
G.9
Data to be reported . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... . .. 56
Annex H (inform ative) Performance testing of gas heated tumble dryers ... ... ... ... ... ... ... ... ... ... 57
H. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 57
H. 2
I nstallation, testing procedure and calculation of supplied gas energy ... ... ... ... ... ... . 57
Annex I (inform ative) Measurement of exhaust air volume ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... . 58
I.1
Procedure .. ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... . 58
I.2
Exhaust air volum e . ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 58
Annex J (norm ative) Measurement of the textile drying tem perature . ... ... ... ... ... ... ... ... ... ... ... .. 59
J. 1
General . ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... 59
J. 2
Specification of the loggers .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. 59
J. 3
Preparation of the loggers before measurem ent ... ... ... ... ... .. ... ... ... ... ... ... ... . .. ... ... ... .. 59
J. 4
Number of loggers .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 59
I EC PAS 631 24:201 7 © I EC 201 7
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J.5
Measuring the temperature .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... .. . ... ... ... ... ... ... ... ... ... .. .. 60
J. 6
Presenting the result .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... . .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... 60
Bibliograph y .. .. ... ... ... ... ... ... ... ... ... ... ... . .. ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... .. . ... ... .. ... ... ... ... ... ... ... ... 61
Figure B. 1 – Exhaust duct bend ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... . .. ... ... ... ... ... ... ... .. ... ... ... ... ... . 33
Figure B. 2 – Exhaust duct Type 2 ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... . .. ... ... ... ... ... ... .. ... ... ... ... ... . 35
Figure C.1 .. ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... . .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... ... ... ... .. 39
Figure C.2 .. ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... . .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... .. . ... ... ... ... ... ... ... ... .. 40
Figure G. 1 – Schematic installation of the m easurement equipm ent for steam heated
tumble dryers (Alternative 1 ) ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... .. . ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 50
Figure G. 2 – Schematic installation of the m easurement equipm ent for steam heated
tumble dryers (Alternative 2) ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 52
Table 1 – List of sym bols .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... .. . ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 1 1
Table 2 – Specification of instruments. ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... .. 1 7
Table 3 – N um ber of items in the test load for various test load masses ... ... ... ... ... ... ... ... ... ... 21
Table 4 – Specifications for initial m oisture content in the test load ... ... ... ... ... ... ... ... ... ... ... ... .. 23
Table 5 – Specification for final m oisture content of the test load after dryin g in a
cotton dry programm e ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... . .. ... .. ... ... .. 24
Table B. 1 – Equivalent tube length of a 90° bend ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... .. . ... ... ... ... .. ... .. 33
Table B. 2 – Pressure drop values for different diam eters and flows for a 1 5 m long duct . ... . 36
Table D. 1 – I dentification data .. ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. . .. ... ... ... ... ... ... ... ... ... ... ... ... ... . 41
Table D. 2 – Test measurem ents .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... ... . 42
Table D. 3 – Test conditions and materials .. ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. . ... ... ... ... ... ... ... .. . 44
Table J. 1 – Specification of tem perature logger suitable for tem perature m easurement
for both washing and dryi ng . ... ... ... ... .. ... ... ... ... ... ... ... ... ... .. . ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... ... ... 59
Table J. 2 – N um ber of temperature loggers to be used during a textile drying
temperature measurem ent ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... ... . .. ... ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 60
–6–
I EC PAS 631 24: 201 7 © I EC 201 7
INTERNATI ONAL ELECTROTECHNI CAL COMMISSI ON
____________
T U M B L E D RYE RS F O R C O M M E RC I AL U S E –
M E T H O D S F O R M E AS U RI N G T H E P E RF O R M AN C E
FOREWORD
1 ) The I nternati on al Electrotechni cal Com m ission (I EC) is a worl d wid e organi zation for stan dardization com prisin g
all n ation al el ectrotechnical comm ittees (I EC National Comm ittees). The object of I EC is to prom ote
internati onal co-operation on all q uestions concerni ng stand ardi zati on in the el ectrical an d electronic fi elds. To
this en d an d i n additi on to other acti vities, I EC publish es I nternational Standards, Techn ical Specificati ons,
Technical Reports, Publicl y Avail abl e Specificati ons (PAS) an d Guides (h ereafter referred to as “I EC
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agreem ent between th e two organi zati ons.
2) The form al decisions or agreem ents of I EC on technical m atters express, as n early as possible, an i nternati onal
consensus of opi nion on the rel evant subjects since each technical com m ittee has representati on from all
interested I EC N ational Com m ittees.
3) I EC Publications have the form of recom m endations for intern ational use an d are accepted by I EC Nati onal
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m isinterpretation by an y en d u ser.
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8) Attention is drawn to th e N orm ative references cited in this publication. Use of the referenced publ ications is
indispensable for the correct applicati on of this publication.
9) Attention is drawn to the possibility that som e of the elem ents of this I EC Publication m ay be th e subject of
patent rig hts. I EC shall not be held responsibl e for identifyi ng any or all such patent ri ghts.
A PAS is an interm ediate specification not fulfillin g the requirements for a standard, but m ade
available to the public.
I EC PAS 631 24 has been processed by subcom mittee 59D: Performance of household and
similar electrical laundry appliances, of I EC technical committee 59: Perform ance of
household and similar electrical appliances.
The text of this PAS is based on the
following docum ent:
D ra ft P AS
59D/447/DPAS
This PAS was approved for
publ ication by th e P-m em bers of the
comm ittee concerned as ind icated in
the foll owi ng d ocum ent
R e p o rt o n
vo ti n g
59D/451 /RVDPAS
Following publication of this PAS, which is a pre-standard publication, the technical comm ittee
or subcomm ittee concerned may transform it into an I nternational Standard.
I EC PAS 631 24:201 7 © I EC 201 7
–7–
This document is based on CLC/TS 50594:201 5.
This PAS shall rem ain valid for an initial maxim um period of 2 years starting from the
publication date. The validity may be extended for a single period up to a maximum of
2 years, at the end of which it shall be published as another type of normative document, or
shall be withdrawn.
I M P O R T AN T
th a t
it
– Th e ' co l ou r i n s i d e'
con tai n s
u n d e rs t a n d i n g
c o l o u r p ri n t e r.
of
c o l o u rs
i ts
wh i ch
c o n te n ts .
logo
a re
U s e rs
on
th e
co ve r p ag e o f th i s
c o n s i d e re d
sh ou l d
to
t h e re fo re
be
p ri n t
p u b l i c ati o n
u s e fu l
th i s
fo r
i n d i c a te s
th e
d o cu m en t
c o rre c t
u sin g
a
–8–
I EC PAS 631 24: 201 7 © I EC 201 7
T U M B L E D RYE RS F O R C O M M E RC I AL U S E –
M E T H O D S F O R M E AS U RI N G T H E P E RF O R M AN C E
1
S cop e
This PAS is applicable to
for comm ercial use of the
and
type, incorporating an electric or steam heating device. I t also includes
which use gas as a heating source with a reference to appropriate EN gas standards.
tu m b l e
d ry e rs
a u to m ati c
au to m at i c
n on -
tu m b l e
d ry e rs
The object is to state and define the principal performance characteristics of
for commercial use of interest to users and to describe standard methods for m easuring these
characteristics.
tu m b l e
NOTE I t does not appl y to
2
t ra n s fe r t u m b l e d r ye r s
d ry e rs
or dryers with autom atic loadi ng and u nl oadi ng.
N o rm a t i ve re fe re n c e s
The following docum ents are referred to in the text in such a way that some or all of their
content constitutes requirem ents of this docum ent. For dated references, onl y the edition
cited applies. For undated references, the latest edition of the referenced docum ent (including
an y am endm ents) applies.
EN 1 2953-1 0, Shell boilers – Part 10: Requirements for feedwater and boiler water quality
EN 50570: 201 3, Household and similar electrical appliances – Safety – Particular
requirements for commercial electric tumble dryers
CLC/TS 50640:201 5, Clothes washing machines for commercial use – Methods for measuring
the performance
EN 60456: 201 1 , Clothes washing machines for household use – Methods for measuring the
performance (I EC 60456: 201 0, modified)
EN 60734, Household electrical appliances – Performance – Water for testing (I EC 60734)
EN 62053-21 , Electricity metering equipment (a.c. ) – Particular requirements – Part 21: Static
meters for active energy (classes 1 and 2) (I EC 62053-21 )
ISO 80000-1 : 2009, Quantities and units – Part 1: General
3
T e rm s ,
3. 1
d e fi n i t i o n s a n d s ym b o l s
T e rm s a n d
d e fi n i t i o n s
For the purposes of this docum ent, the following terms and definitions apply.
3. 1 . 1
t u m b l e d ry e r
appliance in which textiles are dried by tumbling in a rotating drum, through which air is
passed
I EC PAS 631 24:201 7 © I EC 201 7
–9–
3. 1 . 2
ai r ven ted tu m bl e d ryer
tu m bl e d ryer that draws in fresh air which is passed over the textiles and where the resulting
moist air is exhausted into the room or vented outside
3. 1 . 3
con d en ser tu mbl e d ryer
tu mbl e dryer which includes a device for rem oving m oisture from the air used for the drying
process
3. 1 . 4
au tomati c tu mbl e d ryer
tu m bl e d ryer which switches off the drying process when a certain moi stu re con ten t of the
load is reached
Note 1 to entry: This m ay include system s that use cond uctivity or tem peratu re sensi ng.
3. 1 . 5
n on -au tom atic tu mbl e d ryer
tu mbl e d ryer which does not switch off the drying process when a certain moistu re con ten t
of the load is reached, usuall y controlled by a timer, but m ay also be controlled manuall y
3. 1 . 6
tran sfer tu mbl e d ryer
tu mbl e d ryer with automatic loading and unloading via conveyers or by other means
Note 1 to entry: The loadi ng and unloadi ng conveyers are often located on opposite sides of the d ryi ng basket.
3. 1 . 7
test load
textile load used for testing
3. 1 . 8
pre-treatmen t
processing of a new test l oad prior to its first use to avoid rapid changes of characteristics
during the tests
3. 1 . 9
con d i ti on i n g
bringing the test load into therm od ynamic equilibrium with the defined am bient air conditions
of tem perature and hum idity
Note 1 to entry: The process of con d i ti on i n g is not th e sam e as ‘wetti ng’ which is descri bed in 6. 6. 7.
3. 1 . 1 0
test ru n
single perform ance assessment
3. 1 . 1 1
test series
group of test ru n s on a tu mbl e d ryer which, collectivel y, are used to assess the perform ance
of that tu mbl e d ryer
3. 1 . 1 2
operation
performance of a function that occurs during the tu mbl e d ryer drying process such as heating
up, drying, cooling, anti-creasing
– 10 –
I EC PAS 631 24:201 7 © I EC 201 7
3.1 .1 3
programme
series of operations which are pre-defined within the tumble dryer and which are declared
by the manufacturer as suitable for drying certain types of textiles
3.1 .1 4
end of the programme
moment in tim e when the tumble dryer indicates the programme is com plete and the load is
accessible to the user
3.1 .1 5
programme time
period of time from the initiation of the programme (excluding an y user programmed delay)
until the end of the programme
3.1 .1 6
cycle
complete drying process, as defined by the selected programme , consisting of a series of
operations including an y operations that occur after the end of the programme
Note 1 to entry: Exam ples of operations that m ay occur after the com pletion of the programme are m onitoring
and anti-creasi ng operations (where appl icabl e).
3.1 .1 7
cycle time
period of tim e from the initiation of the programme (excluding an y user programm ed delay)
until all activity ceases
Note 1 to entry: Activity is considered to h ave ceased wh en the power consum ption reverts to a steady state
condition that persists indefinitely without user interventi on. I f there is no acti vity after th e end of the programme ,
the cycle time is equal to the programme time .
Note 2 to entry: Cycle time includes an y activity that m ay occur for a lim ited peri od after the end of the
programme . Any cyclic event that occurs in defi nitel y is consi dered to be steady-state.
3.1 .1 8
normalization
processing of a test load after a pre-determ ined num ber of cycles to bring the test load to a
normal state prior to testing
3.1 .1 9
rated capacity
maxim um m ass in kilogram s of dry textiles of a particular defined type, which the
manufacturer declares can be treated in a specific programme
3.1 .20
test load mass
actual m ass of the test load
3.1 .21
conditioned test load mass
mass of the test load when conditioned to correct hum idity and temperature defined in 5.2. 3. 2
3.1 .22
nominal test load mass
mass of dry textiles of a particular type for which the perform ance of the tumble dryer will be
tested ( rated capacity or part load)
Note 1 to entry: Target valu e toward which th e conditioned test load mass wil l be adj usted.
I EC PAS 631 24:201 7 © I EC 201 7
– 11 –
[SOU RCE: EN 61 1 21 :201 3, 3. 1 .20, modified – The second part of the definition has been
turned into the present N ote 1 to entry. ]
3.1 .23
moistu re content
ratio of the difference between test load mass and the conditioned test load mass to the
conditioned test load mass expressed in percent
3.1 .24
initial moisture content
moistu re content of a test load prior to a test run
3.1 .25
final moisture content
moisture content of a test load at the end of a test run
3.1 .26
rated voltage
voltage assigned to the appliance by the m anufacturer
3.2
List of symbols
The sym bols are listed in Table 1 .
Table 1 – List of symbols
Symbol
Unit
Defini tion
a
-
constant part of the regression line
b
-
slope part of th e reg ression li ne
C
%
arithm etical average of th e con densati on efficiency of all vali d test runs
Cj
%
condensation efficiency for test run
d
Kg/l
density of water
E
kWh
arithm etical average of th e corrected energ y consum ption of all valid test run s
Ec
kg/m in
j
evaporati on capacity
Ej
kWh
corrected total en erg y consum ption for test run
j
E mj
kWh
m easured total energ y consu m ption for test run
j
Ee j
kWh
m easured el ectric energ y con sum ption for test run
Esj
kWh
m easured steam energ y consum ption for test run
Eg j
kWh
m easured gas energ y consum ption for test run
Es
kWh/kg
specific corrected en ergy consum ption
vol um etric flow rate
j
j
j
F
m 3 /m in
j
-
L
l
Arithm etical average of the corrected water consum ption of al l vali d test
runs
Lj
l
Corrected water consum ption for test run
j
L mj
l
Measured water consum ption for test run
j
Ls
l/kg
n
-
p
Pa
S
-
test run n um ber
Specific water consum ption
num ber of test run s
static pressure
standard d eviation of m easured results
– 12 –
Symbol
S
b
I EC PAS 631 24:201 7 © I EC 201 7
Unit
Defini tion
-
standard d eviation of th e m easured final moisture content for all vali d test runs
arithm etical average of th e corrected programme time of all vali d test runs
T
m in
T
m in/kg
T
j
m in
corrected program m e tim e for test run
T
m in
m easured programm e tim e for test run
s
mj
specific corrected programme time
j
j
V
l
V
m3
W
g
rated capaci ty for the type of l oad tested
W
g
m ass of the conditi oned test load
W
c
0
clothes contai ner vol um e
exh aust ai r volum e
g
m ass of the test load after d ryi ng
W
g
m ass of the test load after d ryi ng for test run
W
i
g
m ass of the test load after wetting
W
g
m ass of water col lected
W
g
m ass of water col lected du ring test run
W
kg
m ass of the sm all sheet in a test load
W
kg
m ass of the m edium sheet in a test load
W
kg
m ass of the large sheet in a test load
W
kg
desired m asst of the test load
f
fj
w
wj
S
M
L
T
x
i
xi
i
-
m ean of all term s of param eter
x
X
num ber of sm all sheets in a test load
X
num ber of m edium sheets in a test load
X
num ber of l arge sheets in a test load
M
L
j
-th term of param eter x
-
S
j
Y
-
perform ance param eter (energy consum ption or programme time )
μ
%
average m easured final moisture con ten t for a test load
μ f0
%
targ et final moistu re content
μ fj
%
m easured final moisture con tent after test run
μi j
%
m easured initi al moisture con ten t for test run
μi 0
%
nom inal initial moistu re content
4
4.1
j
j
Requirements
General
This PAS does not specify minimum performance requirements for tumble dryers . This PAS
does however set methods for the measurement of following perform ance param eters:
•
•
•
•
•
•
electric energy consumption;
steam energy consumption;
gas energ y consum ption;
water consumption;
programme tim e;
condensation efficiency;
I EC PAS 631 24:201 7 © I EC 201 7
•
•
– 13 –
drying temperature of the textiles;
volum etric flow rate of exhaust air.
An y claim s of perform ance referring to this PAS for these parameters shall be measured in
accordance with the requirements of this PAS. An y claim s of performance referring to this
document at other than rated capacity shall be qualified with load type and capacity used for
the test (refer to Clause 7 for details).
4. 2
Rated capacity
The m anufacturer or supplier shall declare the rated capacity at 0,5 kg intervals for each
relevant textile type up to a rated capacity of 1 0 kg. For capacities larger than 1 0 kg the
supplier m ay declare the rated capacity at 1 kg intervals. Relevant textile types are cotton
and synthetic/blends.
The rated capaci ty for an y textile type shall not exceed the maximum mass of dry laundry, in
kilogram s, to be used in the appliance in accordance with EN 50570: 201 3, 3. 1 . 9.
I f the rated capaci ty is not declared by the m anufacturer, the rated capacity shall be
deduced from the clothes container volum e (see 4. 3) as described in Annex E.
Where the manufacturer gives a range of values for the rated capacity for a particular textile
type, the maximum value shall be used.
For different textiles the rated capaci ty of an appliance m ay be different.
4. 3
Di m en sion s
Where a m anufacturer declares dim ensions, these shall be in accordance with the following
requirements, as applicable. The dimensions shall be given in mm and shall be rounded up to
the nearest higher m illim etre.
•
•
•
•
•
•
5
5. 1
Height = vertical dim ension measured from the lower edge (on the floor) to the upper edge
of the top, with the door/lid closed: if adj ustable levelling feet are provided, they shall be
m oved to determ ine m axim um possible height.
Max height = m aximum vertical dimension m easured from the lower edge (on the floor) to
a horizontal plane at the m aximum height of the tu m bl e d ryer with the door/lid open: if
adjustable levelling feet are provided, they shall be moved up and down to determ ine
m inimum and maximum possible heights.
Width = horizontal dim ension, between the sides, as measured between two parallel
vertical planes against the sides of the tu m bl e d ryer , including all projections.
Depth = horizontal dim ension as measured from a vertical rear plane against the tu m bl e
d ryer and the m ost prominent part of the front, knobs and handles not being taken into
account, with the door/lid closed, including all proj ections.
Max depth = horizontal d im en sion as m easured from a vertical rear plane against the
tu m bl e d ryer and the most prominent part of the front knobs and handles not being taken
into account, with the door/lid open (generall y when at right angles to the machine front),
including all projections.
Clothes container volume = the volume of the container in which textiles are placed, where
required, shall be determ ined in accordance with Annex E.
Test condi ti ons, materi al s, equi pm ent and i nstrum entati on
G en eral
The tolerances specified for parameters within this PAS, using the sym bol ‘ ± ’, indicate the
allowable limits of variation from the specified parameter outside which the test or results
– 14 –
I EC PAS 631 24:201 7 © I EC 201 7
shall be invalid. The statement of tolerance does not perm it the deliberate variation of these
specified parameters.
5.2
Ambient conditions
5.2.1
Electricity supply
The suppl y voltage at the power outlet to each tumble dryer shall be maintained at the rated
voltage ± 2 % throughout the test. I f a voltage range is indicated, then the supply voltage
shall be the nom inal voltage of the country in which the appliance is intended to be used.
The suppl y frequency to each tumble dryer shall be maintained at the rated frequency ± 1 %
throughout the test.
The measured voltage and frequency of the power suppl y used during testing shall be
reported.
Voltage stabilizers should be designed such that the normal operation of the tumble dryer
does not cause undue distortion of the voltage waveform .
5.2.2
5.2.2.1
Water supply
General
This section describes the specifications for water to be used for preparing test loads ,
wetting test loads and for water used as cooling fluid.
In all cases the water suppl y shall meet the requirements given in 5. 2. 2.2. Water used for
norm alizing test loads and wetting test loads shall m eet the requirements of 5. 2. 2.2 and
5. 2. 2. 3.
Water used for wetting test loads for testing conductivity controlled automatic tumble dryers
shall meet the requirem ents of 5. 2.2. 2, 5. 2. 2. 3 and, 5. 2. 2. 4.
The performance of a dryer m ay differ when water of different quality is used to wet the test
load .
5.2.2.2
Water temperature and pressure
The temperature of the cold water suppl y shall be (1 5 ± 2) °C.
The pressure of the water suppl y during water intake at the appliance water inlet shal l be
maintained at (240 ± 50) kPa.
The m easured water temperature and pressure shall be reported.
5.2.2.3
Water hardness
Standard soft water with a total hardness of (0, 5 ± 0,2) mmol/l shall be used for all procedures
within this PAS. I f available, naturall y occurring water of the correct total hardness m ay be
used. Alternatively, water of the correct total hardness shall be prepared according to
EN 60734.
The total hardness of the water used shall be reported.
I EC PAS 631 24:201 7 © I EC 201 7
5.2.2.4
– 15 –
Water alkalinity and conductivity
When testing conductivity controlled automatic tumble dryers , the characteristics of the
water used for wetting the test load can have a large influence on the test results. The water
characteristics are defined in term s of hardness, alkalinity and conductivity.
For the purpose of testing automatic tumble dryers the water for wetting the test load shall
have the characteristics of water prepared according to Method B of EN 60734.
If water characteristics need to be adjusted, Method B or Method C3 of EN 60734 shall be
followed.
If applicable the pH , alkalinity and conductivity of the water used shall be reported.
5.2.3
Ambient temperature and humidity
5.2.3.1
Ambient temperature and relative humidity for tumble dryer testing
The am bient tem perature of the test room shall be (23 ± 2) °C at the start of the drying test.
The tem perature shall not rise more than 4 K during the test run. The measured ambient
temperature for tumble drying testing shall be reported. I t shall be rounded to the nearest
0, 5 °C. The maxim um and m inimum tem perature during the test run shall be recorded. The
measurement location shall be in the vicinity of the air intake.
The ambient relative hum idity of the test room shall be m aintained at (55 ± 1 0) % throughout
the tumble dryer test. The am bient relative hum idity shall be m easured in the vicinity of the
tumble dryer being tested. The maximum and minim um measured ambient relative humidity
for tumble dryer testing shall be reported rounded to the nearest whole percentage.
Care should be taken to ensure that the ambient temperature and relative humidity are not
influenced by the appliance itself or other appliances in the laboratory.
5.2.3.2
Ambient temperature and ambient relative humidity for conditioning of test
load items
Where an am bient controlled room or cham ber is used for conditioning the test load , the
following conditions shall be maintained:
•
•
ambient temperature: (20 ± 2) °C;
am bient relative humidity: (65 ± 5) %.
The m easured ambient temperature and relative hum idity for conditioning test load items
shall be reported. The am bient temperature shall be rounded to the nearest 0, 5 °C, the
am bient relative hum idity shall be rounded to the nearest whole percentage.
NOTE Requi rem ents for conditioning the test load are specified in 6. 6. 5. 2.
5.3
5.3.1
Test materials
General
This section sets out the specifications for test materials required for tumble dryer testing to
this PAS, including test loads and detergent.
NOTE Suitabl e sou rces of test m aterials are given i n A. 6.
5.3.2
Test load
The test load shall consist of small, m edium and large sheets as specified in A. 2.
– 16 –
5.3.3
I EC PAS 631 24:201 7 © I EC 201 7
Detergent
The specification for the EN 60456 reference detergent A* base powder as defined in A.1 .
Detergent dosage is specified in 6. 6. 4. 2.
5.4
Equipment
5.4.1
Equipment for normalization
The specification for a washing machine which is used for the normalization of test loads is
defined in A.7.
5.4.2
Equ ipment for conditioning the test load
This PAS requires test load item s to be treated in a controlled m anner prior to their use in
perform ance tests in order to determine their m ass under standardized ambient conditions.
The alternative methods of conditioning the test load items are:
•
•
Leaving the test load item s in a room or chamber with a controlled ambient temperature
and humidity (refer to 5.2.3.2) until their remaining moisture content is in equilibrium with
the am bient conditions. Refer to 6.6. 5. 2 for details.
Treating the test load item s in a clothes dryer of specified performance to ensure that the
test load items are in a “bone dry” state. Refer to 6. 6.5.3 for details. A.3 sets out the
m ethod and the specifications for a tumble dryer which is used for this method.
5.4.3
Equipment for wetting the test load prior to a test
An y washing m achine may be used to wet the load prior to a test, provided it has the following
features:
•
•
•
•
a rated capacity which is equal to or greater than the load being wetted;
at least one rinse operation with a duration of at least five m inutes;
the rinse shall consist of a volume of water in litres at least three times the mass of the
test load in kilograms;
a spin drying operation capable of achieving the desired initial moistu re content .
5.4.4
Equ ipment for measu rement
This PAS requires the m easurem ent of a range of param eters during testing of a tu mble
dryer. These param eters include the following:
•
•
•
•
•
•
•
•
•
•
•
•
m ass;
electrical parameters (voltage, energ y, power and frequency);
steam energ y (steam pressure, steam temperature, steam flow);
gas energ y (gas flow);
tem perature of water and air;
water pressure;
textile temperature during drying;
relative humidity;
total water hardness;
conductivity of water (conductivity sensing dryers onl y);
alkalinity of water (conductivity sensing dryers only);
tim e.
I EC PAS 631 24:201 7 © I EC 201 7
– 17 –
The specifications of instruments used to take the measurements for some of these
param eters are explicitly defined in 5. 5.
NOTE Several different instru m ents for the m easurem ent of m ass are likely to be requi red for tasks such as m ass
of load item s and the whol e
and m ass of detergent.
te s t l o a d
5. 5
I n s t ru m e n t a t i o n
an d
a c c u ra c y
I nstrum ents used for this PAS shall comply with the specifications set out in Table 2.
Devices using viscosity to m easure water volume shall be calibrated at the actual nom inal
tem perature ± 5 °C, and the nom inal flow rate.
T a b l e 2 – S p e c i fi c a t i o n
P a ra m e t e r
o f i n s t ru m e n t s
Unit
Re s o l u ti o n
Ac c u ra c y
Ad d i t i o n a l
r e q u i re m e n t s
Masses above 50kg
g
50 g
±1 00 g
-
Masses in th e rang e between 1 0kg
and 50 kg
g
10 g
±20 g
-
Masses in th e rang e between 2 kg
and 1 0 kg
g
1 g
±5 g
-
Masses in th e rang e between 1 00 g
and 2 000 g
g
0, 5 g
±1 g
-
Masses in th e rang e up to 1 00 g
g
0, 05 g
±0, 1 g
-
°C
0, 1 °C
±0, 5 K
-
M ass
T e m p e ra t u r e
Am bient tem perature
°C
-
-
See spec. in Ann ex J
Textil e tem perature
°C
0, 1 °C
±0, 5 K
-
% (RH )
1 % (RH )
±3 % (RH )
The specificati ons shall be
m et over a tem peratu re
range of 1 5 °C to 25 °C
l
0, 1 l
±2 %
-
kPa
1 0 kPa
±5 %
s
5s
±1 0 s
-
kWh
As specified in
EN 62053-21 ,
Class 1
instrum ent
definiti on
±1 %
Due to distorti on of th e
voltage and cu rrent wave
form s caused by i nducti ve
devices such as m otor
controls, specific
req uirem ents for energy
m eters are n ecessary.
Water tem perature
Am b i e n t h u m i d i t y
Wa te r vo l u m e
(water i nlet)
W a t e r p re s s u re
Ti m e
E n e rg y
Electrical en erg y consum ption
kWh
Steam energy consum ption
kWh
Gas energ y consum ption
±1 %
±1 %
-
See Ann ex G.
As a recomm endation,
see Annex H.
H a rd n e s s o f w a t e r
C o n d u c ti vi t y o f wa t e r
6
6. 1
mm ol/l
As specified in EN 60734
µ S/cm
As specified in EN 60734
P re p a ra t i o n fo r t e s t i n g
G e n e ra l
This section sets out the requirements for the preparation of a
the requirem ents for the preparation of
.
te s t l o ad s
tu m b l e
d ry e r.
I t also specifies
– 18 –
6. 2
I EC PAS 631 24:201 7 © I EC 201 7
T e s t s p e c i fi c a t i o n s fro m m a n u fa c t u re rs
Specifications that are given specificall y for use by test laboratories shall be ignored.
6. 3
I n s t a l l ati o n
o f t h e t u m b l e d ry e r
The measurem ents shall generall y be carried out on a new
which is installed
and used in accordance with the m anufacturer’s instructions, except as required by this PAS.
Where there is more than one option for installation, the option chosen for testing shall be
docum ented in the test report.
tu m b l e
Stea m
heated
heated
d ry e r
shall be installed according to instructions in Annex G.
should be installed according to instructions in Annex H.
tu m b l e
d ry e rs
t u m b l e d ry e rs
G as
Where the
is intended for use without a duct (i. e. the
is intended
to be vented into the room), the
shall be tested as supplied without a duct.
tu m b l e
d ry e r
tu m b l e
d ry e r
t u m b l e d ry e r
Where the
is intended for use with a duct the
a duct as specified in Annex B.
t u m b l e d ry e r
Where a manufacturer gives the option to use the
the
shall be tested with a duct.
tu m b l e
t u m b l e d ry e r
d ry e r
shall be tested with
both with and without a duct,
t u m b l e d ry e r
The test report shall clearl y state which d uct configuration, if an y, is used in each test.
Where a water inlet is supplied, it shall be connected to an appropriate laboratory water
suppl y system for testing (refer to 5. 2. 2).
If the manufacturer gives the option to use a
both with and without
condensation box, the dryer shall be tested in accordance with the m anufacturer’s
instructions. I f no instructions are provided, then the dryer shall be tested with the
condensation box.
co n d e n s e r tu m b l e
6. 4
P re p a ra t i o n
o f t h e t u m b l e d ry e r fo r a t e s t s e ri e s
Before a
is commenced the
no operating defects that m ay affect the
test
d ry e r
s e ri e s
tu m b l e
shall be checked to confirm that it has
of the unit.
d ry e r
o p e ra t i o n
Before each
the filters, heat exchangers and ducts intended to be serviced by the
user shall be cleaned according to the m anufacturer’s instructions.
t e s t s e ri e s
The manufacturer’s specification for the
of the heat exchanger and
related filters shall be followed. I f no specification is given regarding frequency, or the
specified frequency is greater than six
then the heat exchanger and its related filters
shall not be cleaned between
within a
. I n this context, the
manufacturer’s specification for cleaning the heat exchanger and its related filters m eans the
specification that is directed towards the user.
fre q u e n c y
of
cl ean i n g
c yc l e s
test
6. 5
P re p a ra t i o n
ru n s
te s t
s e ri e s
o f t h e t u m b l e d ry e r fo r a t e s t ru n
Before each
the filters, heat exchangers and ducts intended to be serviced by the
user shall be cleaned according to the manufacturer’s instructions.
tes t
ru n
The
shall be at laboratory ambient temperature (refer to 5. 2. 3.1 ) at the
beginning of each
. This requirem ent has been met if the tem perature of the hottest
internal surface of the
drum rem ains within 2 °C of the ambient air tem perature
for a period of 1 5 m in while the drum door remains closed. Alternativel y the
shall be left for 1 5 h at ambient tem perature between
.
tu m b l e
d ry e r
test
ru n
tu m b l e
d ry e r
tu m b l e
t e s t ru n s
d ry e r
I EC PAS 631 24:201 7 © I EC 201 7
– 19 –
NOTE The l ater is th e preferred m ethod wh en testin g tum ble dryers with a h igh thermal m ass (such as heat
pum p dryers).
6.6
Preparation of test loads
6.6.1
General
This section sets out requirem ents for the preparation of the test loads used in the tu mble
dryer which is to be tested in accordance with this PAS. Refer to Clause 7 regarding the
selection of the required test load mass and requirem ents for tests at rated capacity . This
section sets out:
•
•
•
•
•
•
pre-treatment of new test load items prior to use in testing;
age requirem ents for test load items used in a test series ;
normalization of the test load item s;
conditioning of test load item s to determine the test load mass at a known remaining
moistu re content ;
test load com position;
wetting of the test load .
6.6.2
Pre-treatment of new test load items prior to u se
New test load items shall be treated before their first use by undergoing a normalization
wash process five tim es, as defined in 6.6. 4 but without interm ediate drying. 1 5 g of the
reference detergent A* base powder per kg of test load is added to the first five washes. After
the final pre-treatment wash, the test load shall be dried. Test load items that have
undergone full pre-treatment following CLC/TS 50640: 201 4, 6. 4. 2 do not need to undergo a
new pre-treatment when used for drying.
6.6.3
Requirements regarding the age of test load items
No individual test load items shall be used for more than 1 00 test runs ( Test runs for
washing perform ance according to CLC/TS 50640 and/or test runs for tumble dryer testing
according to this PAS) excluding pre-treatment runs prior to initial use and the normalization
runs (refer to 6. 6.4).
Test loads intended for tumble dryer tests followi ng this PAS shall not be used for an y other
purpose except for wash perform ance tests following the full procedures in CLC/TS 50640.
Loads that have been used for an y other purpose are not suitable for tumble dryer tests
following this PAS.
To meet the age requirem ents specified in this PAS, a system for tracking the number of test
runs for each load item is advisable.
6.6.4
6.6.4.1
Normalization of test load items
General
After they have been used for a minimum of 1 0 test runs and a m aximum of 1 2 test ru ns , all
test load item s shall undergo normalization . N ormalization is the process of washing the
test load in a washing machine using a specified programme in order to bring the test load
back into a stan dardized state.
6.6.4.2
Normalization procedure of test load items
Normalization of the test load items is achieved by processing them once in a washing
machine using 1 5 g per kg of test load item s of the reference detergent A* base powder.
Carry this out using a washing machine and programm e as described in A. 7. On com pletion of
the programme , the test load item s shall then be dried in a tumble dryer.
– 20 –
6.6.5
6.6.5.1
I EC PAS 631 24:201 7 © I EC 201 7
Conditioning of test load items
General
Conditioning is the process of bringing the test load to a known moisture content after
normalization and drying at the completion of a test series in order to check the
standardized m ass of each load item prior to comm encing the next test series .
Conditioning may be done in an ambient controlled room /cham ber or using the bone d ry
method.
The conditioning m ethod used shall be reported.
6.6.5.2
Conditioning of test load items in an ambient controlled room/chamber
I n this m ethod, the test load textiles are dried in a tumble dryer to a final moisture content
of abou t −1 % in the case of synthetics/blend textiles and they are then stretched or flattened
by hand. They are then allowed to reach an equilibrium moisture content when placed in a
room/chamber with an am bient temperature and hum idity which is maintained in accordance
with 5. 2. 3.2. Under this method, two options are available as follows:
•
•
The textiles shall be hung singly and separatel y so that air can freel y circulate between
individual load items. The load is left for a period of not less than 1 5 h.
Textiles shall be left until their m ass has changed by less than 0, 5 % for two successive
m easurements which are taken at intervals of 2 h or more.
NOTE The final moisture content i s d efi n ed at −1 % in order to ensu re th at all item s of the load are conditi oned
com ing from a m ore d ry state.
The mass of the com plete test load in its conditioned state shall be recorded.
6.6.5.3
Conditioning of test load items using the bone dry method
I n this method, the test load textiles are dried continuall y in a tumble dryer of known
performance until the remainin g moisture content has been reduced to a level that is known
as the “bone dry” condition, where very little free m oisture is present. The conditioned mass of
the test load is then determ ined by taking the bone dry mass and multipl ying it by factor
which is determined by the dryer performance characteristics.
The specification for the tumble dryer used and the method to prepare the test load to the
bone dry condition prior to a test series and the calculation of conditioned mass is specified
in A. 3.
6.6.6
6.6.6.1
Test load composition
General
The test load mass is adjusted so that it corresponds to the required test load mass for the
specified programme of the tumble dryer to be tested. The num bers of small, m edium and
large sheets in the test load for various required test load masses are selected so that they
as much as possible correspond to the num ber of test load items as specified in
CLC/TS 50640 for the sam e test load m ass in a washing machine of the same load size. The
number of test load items are specified in Table 3. Final adjustm ent of the test load mass , is
made by adding or rem oving small sheets so that the total m ass is as close as possible
(±0, 06 kg) to the required nominal test load mass .
I EC PAS 631 24:201 7 © I EC 201 7
– 21 –
Table 3 – N u m ber of i tem s i n th e test load
for variou s test l oad m asses
Test l oad m ass
kg
N u m ber of sm al l
sh eets a
N u m ber of
m ed i u m sh eets
N u m ber of l arg e
sh eets
60 cm x 60 cm
90 cm x 1 20 cm
1 40 cm x 1 80 cm
2, 0
6
4
0
2, 5
4
6
0
3, 0
9
6
0
3, 5
8
8
0
4, 0
12
8
0
4, 5
11
10
0
5, 0
15
10
0
5, 5
14
12
0
6, 0
12
12
1
6, 5
11
14
1
7, 0
15
14
1
7, 5
14
16
1
8, 0
12
16
2
8, 5
10
18
2
9, 0
8
18
3
9, 5
7
20
3
1 0, 0
12
20
3
1 5, 0
11
20
10
20, 0
11
20
17
25, 0
11
20
24
30, 0
10
20
31
40, 0
9
20
45
50, 0
9
20
59
60, 0
8
20
73
70, 0
14
20
86
80, 0
13
20
1 00
90, 0
12
20
114
1 00, 0
12
20
1 28
1 50, 0
8
20
1 98
200, 0
11
20
267
250, 0
14
20
336
300, 0
10
20
406
For load si zes not sh own i n Table 3 see 6. 6. 6. 2.
a
The actual n um ber of sm all sh eets m ay differ from the n um ber i ndicated above
(wh ich is inten ded to be i ndicative).
NOTE The num ber of sm all, m edium and l arge sheets in thi s table wi ll give a tes t
l oad as sim ilar as possibl e to the test load used for th e sam e load m ass in
CLC/TS 50640.
– 22 –
6.6.6.2
I EC PAS 631 24:201 7 © I EC 201 7
Calculation of the composition of test load items for load sizes above 1 0 kg
and not shown in Table 3
Calculation of the test load com position is done according to the following formulae:
Number of large sheets ( XL ) = Integer(
W − 20 * W
W
T
− 10 *
M
W)
S
L
Number of small sheets ( Xs ) = Integer
(WT − 20 * MM − XL *WL )
W
S
Number of medium sheets ( XM ) = 20 for all test loads above 1 0 kg
where:
W
W
W
W
X
X
X
T
S
M
L
S
M
L
= the total test load m ass (kg)
= the m ass of a sm all sheet
= the m ass of a m edium sheet
= the mass of a large sheet
= number of small sheets
= num ber of m edium sheets
= number of large sheets
Values according to specification of the test load given in A. 2:
W
S
= 0,1 1 0 kg (nominal mass)
W
= 0, 31 5 kg (nominal mass)
M
W = 0, 720 kg (nominal mass)
L
The m ass of the individual test load items as defined above is a nominal value. Therefore the
num ber of small and large sheets for a certain load as defined in Table 3 m ay differ. I f
adj ustm ents need to be done the num ber of small sheet shall not be selected lower than 1 0
and not above 20.
Care is required to ensure that no test load item s are lost or gained between test runs , so a
system of accounting for all test load item s should be used.
6.6.7
6.6.7.1
Wetting
Temperature of the test load
Before wetting the tem perature of the test load and the water used for wetting shall be within
the limits of the ambient tem perature specification according to 5. 2. 3. 1
I EC PAS 631 24: 201 7 © I EC 201 7
6. 6. 7 . 2
The
We tti n g
i n i ti al
– 23 –
p ro c e d u re
m o i s t u re c o n t e n t
is established by wetting and spinning the load.
The load shall be hom ogeneously wetted. This shall be carried out in a washing m ach ine
according to the specification given in 5. 4.3. I n order to get the wetting to be as
hom ogeneousl y as possible the extraction speed of the washing machine shall be set so low
that the final moisture not will be reached within 3 min. The load shall be spun for as long as
necessary to reach
in the range:
i n i t i a l m o i s t u re c o n t e n t
μi o + 3 % to μ io – 5 %
where
is the nom inal initial m oisture content.
μi o
The
m o i s t u re c o n t e n t
W -W
W
i
0
0
of the wet
tes t l oad
μij is calculated as
expressed as a percentage,
where
Wi
W0
is the mass of the
te s t l o ad
after wetting; and
is the m ass of the conditioned
tes t l o ad
.
Water is then added evenl y by m eans of a fine spray as necessary, so that the
of the
when starting the test lies within the allowable range
specified in Table 4. This initial wet m ass is recorded as Wi .
i n i ti al
m o i s t u re
co n te n t
te s t
l o ad
other than specified in Table 4 may be used if clearl y stated with
the results. Annex F shows how the results of tests using two different
m ay be used to calculate the drying tim e and energy consum ption that relate to
other
.
I n i ti a l
m o i s t u re
con ten ts
i n i ti al
m o i s t u re
con ten ts
i n i ti al
m o i s t u re c o n t e n t s
NOTE 1 The preferred m ethod is th e on e given in Ann ex F. The val ues g iven in Table 4 are only recom m ended
where a singl e resu lt is req uired for a sin gle m arket and l oad.
NOTE 2 Resu lts m easured di rectly have priority over results calculated usin g th e m ethod shown in Ann ex F, for
the purposes of resolvi ng disputes.
T a b l e 4 – S p e c i fi c a t i o n s fo r i n i t i a l
co n ten t i n
N om i n al
i n i ti a l
μ
Al l o w a b l e ra n g e fo r
m o i s t u re
c o n te n t o f th e te s t l o a d
i n i ti a l
m o i s t u re c o n t e n t
μ
i0
50 %
7
m o i s t u re
th e te s t l o a d
45 %
ij
to 5 3
%
P e rfo rm a n c e m e a s u re m e n t s – G e n e ra l re q u i re m e n t s
This clause sets out the overall strategy for carrying out perform ance tests using this PAS.
Prior to performing a
•
•
t e s t s e ri e s
, the following param eters need to be selected:
performance tests required (energ y and water consum ption, condensation efficiency, etc);
to be tested on the
;
p ro g ra m m e
t u m b l e d ry e r
– 24 –
I EC PAS 631 24:201 7 © I EC 201 7
initial moisture content of the test load ;
target final moisture content of the test load ;
test load mass .
•
•
•
The primary requirem ent of this PAS is for determ ination of perform ance at rated capacity for
each relevant load type and set of test conditions. An y claim of perform ance to this PAS
without a statement of load size shall be determ i ned on the basis of tests at rated capacity .
However, additional tests m ay be conducted at other capacities. An y claims of perform ance
for such test results shall be qualified with the test load capacity used.
When two or m ore of the following performance param eters are required for a single tumble
dryer, they shall be measured as far as possible using a single comm on test series as set
out in Clause 8:
electric energy consumption;
steam energy consumption;
gas energ y consum ption ;
water consumption ;
programme time;
condensation efficiency;
textile drying temperature;
exhaust air volum e.
•
•
•
•
•
•
•
•
8
Tests for performance
8.1
General
Clause 8 sets out the test procedure for the determ ination of performance for the tumble
dryer.
8.2
Test procedure for performance tests
8.2.1
Test conditions, materials and preparation for testing
For each test run the tu mble dryer shall be prepared according to Clause 6.
8.2.2
Programme
The programme selected on the tumble dryer and an y associated settings shall initiall y be in
accordance with the manufacturer’s instructions. I n the absence of an y instructions from the
manufacturer, or if the recomm ended programmes do not achieve valid results (see 8. 2. 5)
then a suitable programme is established by trial and error before a full test series is carried
out.
Table 5 – Specification for final moistu re content of the test load
after drying in a cotton dry programme
Programme or user
requiremen ts
Dryin g programme 1
Target final
moisture
content value
Range for final moisture
content for a test run
μ f0
μ fj
0%
− 3 % to +3 %
Al lowable range for average
final moisture con ten t μ of a
test series
Less than +1 , 5 %
I EC PAS 631 24:201 7 © I EC 201 7
– 25 –
The selected programm e shall be used for all test ru n s in a test series . I f it is decided part
way through a test seri es that the prog ram me shall be changed in order to achieve the
required target fin al m oistu re con ten t value then the test seri es shall be aborted and
another test seri es started using the alternate prog ram me .
The prog ramm e selected on the tu mbl e d ryer (with an y associated settings) shall be
reported.
8. 2. 3
Test load
Prior to a test ru n , a separate conditioned test l oad as specified in Clause 6 shall be
prepared for each tu mbl e d ryer being tested.
8. 2. 4
Test procedu re
I mm ediatel y before each test ru n , the test l oad shall be wetted according to 6. 6. 7.
The test load shall be loaded into the tu mbl e d rye r within 5 m in of having been wetted and
the selected prog ram me shall be started without delay.
No control on the tu mble dryer (for example the timer control) shall be adjusted by the
operator while the prog ram m e is running.
At the en d of th e prog ram m e , the test load shall be removed within 2 min and immediatel y
weighed. The final test l oad m ass for test ru n j is recorded as Wfj .
When the prog ram me has terminated and the tu mbl e d ryer has stopped, this means that the
test ru n has finished. The test load shall not be subj ected to an y further drying as part of the
sam e test ru n .
The final m oisture content for test run j is calculated as:
µ fj = (Wfj – W0 ) / W0 (expressed as a percentage)
where
W0
is the m ass of the conditioned test load.
The fin al moi stu re con ten t shall be reported.
8. 2. 5
Val id ity of a test ru n
I f the fi n al moistu re con ten t for a test ru n is within the range given in Table 5, then the test
ru n shall be declared valid. Otherwise the test ru n shall be declared invalid.
I f the dryer has stopped automaticall y during a test ru n because a condensate container is
full of water, the fact shall be reported and the test ru n shall be declared invalid.
An y adverse warning indicators (e. g. warnings or faults) shall be recorded and considered
when assessing test ru n validity. H owever, if the run is not invalid for an y of the reasons
given above, it shall be declared valid.
8. 2. 6
Val idity of a test seri es
A test seri es of five tests shall be carried out on the tu mble d ryer. I n circum stances where
one of the five test ru n s is invalid, a sixth test ru n m ay be carried out on the tu mbl e d ryer
using the sam e prog ram me setting, and the sam e nom inal i n iti al moi stu re con ten t as all the
previous test ru n s in the test seri es . The invalid test ru n shall be elim inated completel y from
an y subsequent evaluation.
– 26 –
I EC PAS 631 24: 201 7 © I EC 201 7
I f more than one test run is invalid in a test series , then the whole test series shall be
declared invalid.
I f the average final moisture content for a test series of five valid runs is below the upper
lim it of the allowable range given in Table 5, then the test series shall be declared valid and
the results evaluated according to Clause 9. Otherwise the test series shall be invalid.
I f a test series of 5 valid test runs is invalid, it shall not be made valid by substituting one of
the test runs with a sixth test run .
Data from an invalid test series shall not be used for evaluation according to Clause 9.
I f a tumble dryer cannot complete a valid test series using the programme recomm ended
by the manufacturer to dry a particular load type then this fact shall be reported. A new test
series shall then be carried out using the programme with the next lower final moistu re
content . I f no such programme is available then the test series shall be stopped.
A schem atic representation of a test series is set out in Annex C.
8.3
8.3.1
M easurements to determine water and energy consumption and programme time
General
This subclause contains specific requirem ents for the measurem ent of energ y consum ption,
programme time and water consu mption . The purpose is to obtain reproducible data for the
calculation of environmental impacts and cost of operation based on energ y and water
consumption.
Evaluation of the measurem ents perform ed in this clause is set out in 9. 2, 9. 3, 9. 4 and 9. 5.
The water added to the process in the form of steam shall not be added to the corrected water
consumption as described in 9.5. The steam shall be reported as kilogram s of steam
according to Clause G. 9.
8.3.2
Procedure
The test load shall be subj ected to the perform ance test procedure specified in 8.2. During
these tests, instrum entation for the m easurement of electrical energy, steam energy, gas
energ y, water volume and tem perature shall record the required parameters (refer to
Clause 5). I t is recommended that data for all param eters be recorded at regular intervals
throughout the test using a data logger or com puter. Data collection should com mence well
before the programme is initiated and continue until after the end of the programme .
Measurements shall comm ence when the programme is initiated (without an y user
programmed delay). They shall be stopped at the end of the programme .
Measurements shall be m ade on all five valid test runs of a valid test series for the selected
programme .
8.4
8.4.1
M easu rements to determine condensation efficiency
General
This subclause contains specific requirem ents for the m easurem ent of condensation
efficiency of condenser tumble dryers . Evaluation of the measurem ents performed in this
clause is set out in 9. 7.
I EC PAS 631 24:201 7 © I EC 201 7
8.4.2
– 27 –
Procedure
The tumble dryer shall be conditioned no m ore than 36 h before the first test run by drying a
rated capacity load that has been wetted to no less than the minim um relevant value given in
Table 4. It shall then be allowed to cool to am bient tem perature as described in 6.5.
The tumble dryer door shall remain closed during the period before starting the test.
The test load shall be subjected to the performance test procedure specified in 8. 2.
The mass of the test load is m easured imm ediatel y before and after the test run . The m ass
of moisture condensed during the test run and water collected is determ ined.
I f m ore than 36 h elapses between one test run and the next then the tumble dryer shall be
conditioned as described above prior to the next test run .
Measurements shall be made on all five valid test runs of a valid test series for the selected
programme .
8.5
M easurements to determine exhau st air volu me
This clause contains specific requirements for the m easurem ent of exhaust air volume.
Evaluation of the m easurements perform ed in this clause is set out in 9. 9.
This m easurement is applicable for externall y vented tumble dryers onl y.
Under certain climatic conditions an air vented tumble dryer which is externall y vented may
consum e additional thermal energ y where the indoor tem perature is lower or higher than the
outdoor air temperature. I n this case it is assumed that the exhaust air is vented outside and
replaced through the intake of outdoor air into the building.
8.6
Performance measurement at maximum exhaust du ct pressure
Performance m easurem ent test series are norm all y performed with an exhaust duct pressure
according to Table B. 2. A perform ance test can also be made at the maximum exhaust duct
pressure indicated by the manufacturer. I n that case the dam per in Figure B. 2 shall be set so
the pressure drop in the exhaust duct is equal to the m aximum pressure declared by the
manufacturer.
8.7
M easu rement of the textile drying temperatu re
The textile drying temperature shall be measured by temperature loggers placed in the drum
and following the load during the drying phase. The procedure and specification of the loggers
are described in Annex J .
9
9.1
Assessment of performance
General
Clause 9 sets out the primary evaluation m ethods for the assessment of tumble dryer
performance under this PAS. This clause includes the evaluation of all the performance
param eters listed in Clause 7.
Rounding shall onl y be applied to reported values in Annex D. I f numbers have to be rounded
they shall be rounded to the nearest number according to I SO 80000-1 : 2009, B.3, Rule B. I f
the rounding takes place to the right of the com ma, the om itted places shall not be filled with
zeros.
– 28 –
9.2
I EC PAS 631 24:201 7 © I EC 201 7
Final moisture content of the load
The final moisture content of the load shall be evaluated as shown in 8. 2. 4.
The average final moisture content µ of the valid test runs of a test series is calculated as:
μ=
n
1
n∑
j=
μ fj
1
where
n is the num ber of test runs ;
j
is the test run num ber;
µ fj is the m easured final moisture content after test run j.
The standard deviation of the m easured final moisture content Sb , which is a m easure of the
variability between test runs in one test series on a selected programme or timer setting, is
calculated for a test series :
1
n
n −1 ∑
j=
Sb =
( μfj − μ )²
1
where
n
j
µ fj
µ
9.3
is
is
is
is
the
the
the
the
number of test runs ;
test run number;
measured final moisture content after test run j ;
average m easured final moisture content for the test series .
Total energy
The total measured energy Emj is the sum of the measured electric energy and the m easured
steam energy m easured according to Annex G and, if gas energ y is m easured, to follow the
instructions in Annex H.
9.4
Corrected energy
I f the final moisture content of a valid test run is within the target range given in Table 5
then the corrected energ y consumption shall be evaluated as shown below using the
measurem ents from valid test runs determined in 8. 3.
Otherwise, no correction shall be m ade on the energy consumption and the measured energy
consum ption shall be declared as the corrected energ y consum ption.
The corrected energy consumption Ej is calculated for each test run j in a test series :
E j = E mj x
( μ i0 − μ f0 ) x W
(Wi - Wf )
where
Em j is the measured energ y (electrical and steam or gas)for test run j ;
µ i0 is the nominal initial m oisture content;
µ f0 is the target final moisture content
I EC PAS 631 24:201 7 © I EC 201 7
– 29 –
is the rated capacity of the tumble dryer for the type of load tested;
is the mass of the test load after wetting;
is the m ass of the test load after drying.
W
Wi
Wf
The average corrected energ y consumption E is calculated from the corrected energy
consum ption of all valid test runs :
E=
n
1
Ej
n∑
j
=1
where
is the num ber of test runs ;
is the test run num ber;
is the corrected energ y consum ption of the test run j .
n
j
Ej
9.5
Corrected water consumption
The corrected water consum ption shall be evaluated as shown below using the measurements
from valid test runs determ ined in 8. 3.
The corrected water consumption L j is calculated for each test run j in a test series
( − ) xW
L j = L mj x m i0 m f0
(Wi - Wf )
where
Lm j
µ i0
µ f0
W
Wi
Wf
is
is
is
is
is
is
the
the
the
the
the
the
m easured water consumption for test run j;
nominal initial moisture content ;
target final moisture content ;
rated capacity of the tumble dryer for the type of load tested;
m ass of the test load after wetting;
mass of the test load after drying.
The average corrected water consumption L is calculated from the corrected water
consum ption of all valid test runs :
n
L = 1 ∑ Lj
n j=
1
where
n
j
Lj
9.6
is the number of test runs ;
is the test run num ber;
is the corrected water consumption of test run j
.
Corrected programme time
I f the final moisture content of a valid test run is within the target range given in Table 5
then the corrected programme time shall be evaluated as shown below using the
measurem ents from valid test runs determ ined in 8. 3.
– 30 –
I EC PAS 631 24:201 7 © I EC 201 7
Otherwise, no correction shall be m ade on the programme tim e and the measured
programme time shall be declared as the corrected energ y consumption.
The corrected programme time Tj is calculated for each test run j in a test series :
T j = T mj x ( m i0 − m f0 ) x W
(Wi - Wf )
where
Tm j
µ i0
µ f0
W
Wi
Wf
is the m easured programme time for test run j ;
is the nominal initial moisture content ;
is the target final moisture content ;
is the rated capacity of the tumble dryer for the type of load tested;
is the mass of the test load after wetting;
is the mass of the test load after drying.
The average corrected programme time t is calculated from the corrected programme times
of all valid test runs :
n
T = 1 ∑T
n j=
j
1
where
n
j
Tj
9.7
is the num ber of test runs ;
is the test run num ber;
is the corrected programme time of test run j .
Condensation efficiency
The condensation efficiency shall be evaluated as shown below using the measurements
from valid test runs determ ined in 8. 4.
Condensation efficiency Cj is calculated for all valid test runs and expressed as a
percentage:
Cj = W wj
Wi - W f
× 1 00
where
Wwj is the m ass of water collected during a test run j;
Wi is the mass of the test load used after wetting but before drying;
Wf is the mass of the test load after drying.
The average condensation efficiency C is calculated from the condensation efficiencies of all
valid test runs and expressed as a percentage:
n
C = 1 ∑ Cj
n j=
1
I EC PAS 631 24:201 7 © I EC 201 7
– 31 –
where
n
j
Cj
9.8
is the num ber of test runs ;
is the test run num ber;
is the condensation efficiency of test run j .
Evaporation capacity
The evaporation capacity shall be evaluated as shown below using the m easurem ent from
valid test runs determ ined in 8. 4:
n W −W
Ec = 1 ∑ ij fj
n j = Tmj
1
where
n
Ec
j
Tm j
Wwj
Wij
Wfj
9.9
is
is
is
is
is
is
is
the
the
the
the
the
the
the
num ber of test runs ;
evaporation capacity ;
test run num ber;
m easured programme time of test run j ;
mass of water collected in the condenser reservoir during test run j ;
m ass of the test load used after wetting but before drying during test run j;
m ass of the test load after drying during test run j.
Exhaust air volume
The exhaust air volum e shall be evaluated as shown in Annex I .
1 0 Data to be reported
For each test, the relevant data that shall be reported are listed in Annex D. I t is
recom mended that the data be presented in the form at shown in Annex D.
– 32 –
Annex A
(normative)
Reference list
A.1
Reference detergent
See CLC/TS 50640:201 5, Annex B.
A.2
Specification of test load
See CLC/TS 50640:201 5, Annex C.
A.3
The bone dry method of conditioning
See CLC/TS 50640:201 5, Annex F.
A.4
Uncertainty of measurement
See EN 60456: 201 1 , Annex Q.
A.5
Environmental aspects of tumble dryer use
See EN 60456: 201 1 , Annex R.
A.6
Source of materials and supplies
See CLC/TS 50640:201 5, Annex N.
A.7
Washing machine for normalization
See CLC/TS 50640:201 5, 6. 4. 4. 2.
I EC PAS 631 24:201 7 © I EC 201 7
I EC PAS 631 24:201 7 © I EC 201 7
– 33 –
Annex B
(normative)
Exhaust ducts for tumble dryer testing
B.1
General
The pressure duct shall compl y with a 1 5 m long duct with a diam eter specified by the
manufacturer. The duct can be of two different types; Type 1 and Type 2.
B.2
B.2.1
Specification of the exhaust duct type 1
Duct material
The duct shall consist of a steel pipe, called spiro-pipe. The diameter of the pipe shall be in
accordance with the requirements given be the m anufacturer for the tumble dryer under test.
B.2.2
The form of the duct
d
The duct can be in the form of a straight tube or bended. I t is allowed to add maxim um three
90° bends with a design according to Figure B. 1 . I f one or more bends are added the total
length of the exhaust duct shall be corrected. The correction shall be made according to
Table B. 1 . A straight tube of the length of at least 200 cm shall be fitted between each bend.
R
IEC
Key
Allowed types of bends:
Type 1 :
R/d = 1
Type 2:
R/d = 2
Figure B.1 – Exhau st duct bend
Table B.1 – Equivalent tube length of a 90° bend
Bend type
Equivalent tube
length (m)
R/d = 1
1 6 × di am eter(m )
R/d = 2
1 2 × di am eter(m )
EXAM PLE Tube di am eter 0, 2 m . I f two 90° bends
with R/d = 1 are added they represent an equi val ent
tube length of 2 × 1 6 × 0, 2 m = 6, 4 m . Thus 8, 6 m of
straight tubes shall be add ed to achi eve a
correspon din g all straig ht tube of 1 5 m .
– 34 –
B. 2. 3
I EC PAS 631 24:201 7 © I EC 201 7
I n s t ru m e n t a t i o n
The exhaust duct shall be equipped with exhaust pressure equipment and a flow m eter. The
pressure reading shall be made at a distance from the output of the
of 0, 5 m.
No bend m ay exist between the output and the pressure m easurem ent point. After the
measurement point another straight tube with a length of at least 0, 5 m shall be attached. The
flow m eter shall before and after the measurem ent point be attached to straight tubes with a
length of 1 m or more.
tu m b l e
B. 3
B. 3. 1
d ry e r
E xh a u s t d u c t t yp e 2
G e n e ra l
For laboratories where the space for ducts Type 1 is limited ducts according to Type 2 can be
used.
B. 3. 2
S p e c i fi c a t i o n
o f e xh a u s t d u c t T yp e 2
The duct shall be designed according to Figure B. 2. The horizontal part of the duct shall be in
accordance with the specification from the m anufacturer while the vertical part can be in an y
dim ension as long as the pressure drop between
output and ambient is not
larger than corresponding drop for an exhaust duct Type 1 . The horizontal length of the duct
before and after the pressure m easurement point shall be 0, 5 m .
tu m b l e
B. 3. 3
d ry e r
S e t t i n g t h e c o rre c t e x h a u s t d u c t p re s s u re
The flow in the Type 2 exhaust duct restrictor shall be adj usted so the flow resistance in the
duct is in line with the resistance of a Type 1 straight 1 5 m exhaust duct. This shall be done
as follows: use the inform ation given by the m anufacturer regarding dimension of the exhaust
duct and exhaust air flow. I n Table B. 2 select the column for the given diameter of the
exhaust duct and chose the pressure drop corresponding to the air flow. (Use interpolati on if
necessary. )
Run the
and
and adjust the air damper so the
sam e pressure drop will occur as found in Table B. 2. Measure the air flow and if the air flow
now differs from the value obtained from the m anufacturer read a new pressure drop in
Table B. 2 based on the m easured air flow. Repeat the
above until the pressure
drop and the air flow is in accordance with the values in Table B. 2.
tu m b l e
d ry e r
wi th o u t
l oad
wi th o u t
h e a ti n g
o p e ra t i o n
I EC PAS 631 24:201 7 © I EC 201 7
– 35 –
Resistor (ai r dam per) i n
ord er to get correct
exh aust d uct pressu re
Min im um 1 m
of straig ht
tube before
and after th e
flow m eter
Flow m eter
postion
Tum bl e dryer
Pressure
m easurem ent
l ocation
d
0, 5 m of straight tubes before and after th e
pressu re m easurem ent points
IEC
Figu re B.2 – Exhaust duct Type 2
– 36 –
I EC PAS 631 24:201 7 © I EC 201 7
Table B.2 – Pressure drop values for different diameters
and flows for a 1 5 m long duct
Pressu re drop (Pa) for a circular duct for di fferen t duct diameters and air flows
Exhaust duct diameter
Cold air
M 3 /h
(mm )
flow
1 00
1 25
1 50
200
1 50
69, 28
200
1 1 4, 62
39, 71
220
1 35, 42
46, 92
250
1 69, 38
58, 69
24, 68
260
1 81 , 41
62, 85
26, 44
280
206, 53
71 , 56
30, 1 0
300
233, 03
80, 74
33, 96
350
305, 1 9
1 05, 74
44, 48
360
320, 62
1 1 1 , 09
46, 73
400
385, 53
1 33, 58
56, 1 9
1 4, 33
420
41 9, 90
1 45, 49
61 , 1 9
1 5, 60
430
437, 55
1 51 , 60
63, 77
1 6, 26
450
250
31 5
473, 78
1 64, 1 6
69, 05
1 7, 61
500
569, 71
1 97, 39
83, 03
21 , 1 7
550
673, 1 2
233, 22
98, 1 0
25, 01
600
783, 83
271 , 58
1 1 4, 23
29, 1 3
620
830, 1 2
287, 62
1 20, 98
30, 85
640
877, 55
304, 05
1 27, 89
32, 61
650
901 , 68
31 2, 41
1 31 , 41
33, 51
700
1 026, 54
355, 68
1 49, 60
38, 1 5
1 3, 22
750
1 1 58, 28
401 , 32
1 68, 80
43, 04
1 4, 91
800
1 296, 77
449, 30
1 88, 99
48, 1 9
1 6, 70
850
499, 59
21 0, 1 4
53, 59
1 8, 57
860
509, 92
21 4, 48
54, 69
1 8, 95
900
552, 1 5
232, 24
59, 22
20, 52
950
606, 94
255, 29
65, 1 0
22, 56
1 000
663, 95
279, 27
71 , 21
24, 67
1 060
723, 1 3
304, 1 6
77, 56
26, 87
1 1 00
784, 46
329, 96
84, 1 4
29, 1 5
1 200
91 3, 48
384, 23
97, 98
33, 95
1 300
1 050, 83
442, 00
1 1 2, 71
39, 05
1 3, 03
1 400
1 1 96, 35
503, 21
1 28, 32
44, 46
1 4, 83
1 500
1 349, 87
567, 78
1 44, 78
50, 1 6
1 6, 74
1 600
635, 67
1 62, 1 0
56, 1 6
1 8, 74
1 700
706, 82
1 80, 24
62, 45
20, 83
1 800
781 , 1 8
1 99, 20
69, 02
23, 03
1 900
858, 70
21 8, 97
75, 87
25, 31
2 000
939, 34
239, 53
82, 99
27, 69
400
I EC PAS 631 24:201 7 © I EC 201 7
– 37 –
Pressu re drop (Pa) for a circular duct for di fferen t duct diameters and air flows
Exhaust duct diameter
Cold air M 3 /h flow
(mm )
1 00
1 25
1 50
200
250
31 5
400
2 250
1 1 54, 36
294, 36
1 01 , 99
34, 03
2 500
1 388, 09
353, 96
1 22, 64
40, 91
1 3, 1 5
2 750
1 640, 04
41 8, 21
1 44, 90
48, 34
1 5, 54
3 000
1 909, 78
487, 00
1 68, 73
56, 29
1 8, 1 0
3 250
560, 22
1 94, 1 0
64, 76
20, 82
3 500
637, 80
220, 98
73, 72
23, 70
3 750
71 9, 64
249, 34
83, 1 8
26, 74
4 000
805, 69
279, 1 5
93, 1 3
29, 94
– 38 –
I EC PAS 631 24:201 7 © I EC 201 7
Annex C
(informative)
Flow diagrams
Figure C.1 shows the decision chart illustrating the requirements for a valid test series for
automatic tumble dryers . Figure C. 2 shows the decision chart illustrating the requirem ents
for a valid test series for non automatic tumble dryers .
I EC PAS 631 24:201 7 © I EC 201 7
– 39 –
Start test series
5 tests done
All final m oisture
contents with in th e
given lim it for
single test?
Yes
Con denser
dryer?
Yes
No
No
Only on e
invalid ?
No
No
Yes
All test runs with out
interru ption du e to water
contain er fu ll?
Yes
Yes
Delete the non com plying
test out of the set of tests
Perform 6 th test
No
All final m oisture
contents of the rem aini ng
runs within th e gi ven lim it
for singl e test?
Averag e final m oisture
content below the given
lim it for average?
Yes
No
Assess 5 tests
accordi ng to th e
standard
Repeat test seri es
of stop
IEC
Figure C.1
– 40 –
I EC PAS 631 24:201 7 © I EC 201 7
Start test series
5 tests done
All final m oisture
contents with in th e
given lim it for
single test?
Yes
No
Yes
No
No
Only on e
invalid ?
No
Con denser
dryer?
Yes
All test runs with out
interru ption du e to water
contain er fu ll?
Yes
Yes
Delete the non com plying
test out of the set of tests
Perform 6 th test
All final m oisture
contents of the rem aini ng
runs within th e gi ven lim it
for singl e test?
No
Averag e final m oisture
content below the given
lim it for average?
Yes
No
Repeat test seri es
or stop
Assess 5 tests
accordi ng to th e
standard
IEC
Figure C.2
I EC PAS 631 24:201 7 © I EC 201 7
– 41 –
An n e x D
(normative)
T e s t re p o rt – D a ta t o b e re p o rte d
This annex presents the data to be reported.
The layout of the following Tables D. 1 to D. 3 is recomm ended. Onl y the tables and
parameters that are relevant for the
need to be included.
t e s t s e ri e s
Tabl e D . 1
Title: “
Te s t Re p o rt to C L C / TS
50 5 9 4: 2 0 1 5
– I d e n t i fi c a t i o n
d ata
” (state editi on and year used)
Laboratory n am e and add ress:
Laboratory test report id;
Laboratory sam ple id;
Bran d:
Model nam e:
Model num ber;
Serial num ber:
Source of appliance:
Cou ntry of m anufactu re:
Ap p l i a n c e d i m e n s i o n s d e c l a r e d
(cm )
Ap p l i a n c e d i m e n s i o n s m e a s u re d
Heig ht:
Heig ht:
Max h eig ht:
Max h eig ht;
Width:
Width:
Depth:
Depth:
Max d epth;
Max d epth;
Drum vol um e (l): a
Drum vol um e (l): a
Ra t e d
cap aci t y
(cm )
(kg) a
Cotton/synth etics blend:
Desi g n
o f d r ye r
Axis (vertical / horizontal):
Dryer loadin g (top / front):
Air vented (yes / no):
Con denser (yes / no):
Autom atic (sensor-controlled) (yes / no):
Tim er controll ed (yes / no):
Heati ng alternati ve (el ectrical/steam /gas
Cold water con nection (yes/no)
Rated voltage (V):
Rated frequency (H z):
Additional i nform ation (for exam ple, include h ere if applicable, reasons wh y the test h ad to be stopped before
com pletion an d state if the nom inal test load m ass is not equ al to the
):
ra t e d
Page n um ber:
a
As applicabl e.
ca p aci ty
Num ber of pag es in this report:
– 42 –
I EC PAS 631 24:201 7 © I EC 201 7
Table D.2 – Test measurements
Laboratory n am e and add ress:
Laboratory test reference:
Laboratory sam ple reference:
Prog ram m e
setting;
Symbol
Units
Noted (n )
Measured
(m )
Calculated
Reported
precision b Run 1 Run 2 Run 3 Run 4 Run 5 Mean
(calc)
Date of test
yy/mm /
dd
n
-
Con ditioned
test load m ass
W0
g
m
1
Mass of test
load after
wettin g
Wi
g
m
1
Nom inal initi al
m oisture
content
µi o
%
n
0, 1
I nitial
m oisture
content
µi j
%
calc
0, 1
Final test load
m ass
Wf
g
m
1
Targ et final
m oisture
content
µf0
%
n
0, 1
Final m oisture
content
µfj
%
calc
0, 1
Measured
electrical
energ y
consum ption
Eej
kWh
m
0, 01
Measured
steam energ y
consum ption
Esj
kWh
m
0, 01
Measured g as
energ y
consum ption
Eg j
kWh
m
0, 01
Measured
energ y
consum ption
Emj
kWh
m
0, 01
Corrected
energ y
consum ption
Ej
kWh
m
0, 01
Specific
corrected
energ y
consum ption
Es
kWh/kg
calc
0, 001
Measured
water
consum ption
L mj
l
m
0, 1
Corrected
water
consum ption
Lj
l
calc
0, 1
S
I EC PAS 631 24:201 7 © I EC 201 7
Symbol
Units
– 43 –
Noted (n )
Measured
(m )
Calculated
Reported
precision b Run 1 Run 2 Run 3 Run 4 Run 5 Mean
S
(calc)
Specific
corrected
water
consum ption
Ls
i/kg
calc
0, 1
Measured
programm e
tim e
Tmj
m in
m
0, 5
Corrected
programm e
tim e
Tj
m in
calc
0, 5
Specific
corrected
programm e
tim e
Ts
m in/kg
m
0, 1
Mass of water W
w
collected a
g
m
1
Con densation
efficiency a
C
%
calc
0, 1
Evaporation
capacity
EC
l/m in
calc
Exhaust air
vol um e a
V
m3
calc
1
Am bient
tem peratu re
°C
m
0, 1
Am bient
hum idity
%
m
1
Page n um ber:
Num ber of pag es in this report:
a
To be d eclared onl y when appli cable.
b
The fi gu res for reported preci sion specify the roun din g and reportin g of valu es. As an exam ple, a reported
precision of 0, 001 m eans that the result shall be reported rounded to 3 d ecim al places.
– 44 –
I EC PAS 631 24:201 7 © I EC 201 7
Table D.3 – Test conditions and materials
Laboratory n am e and add ress:
Laboratory test reference:
Laboratory sam ple references:
Conditions during the drying test
Average
Max
Min
Average
Max
Min
Air tem perature arou nd the tu m ble dryer (°C)
Test room hum idity (%)
Electricity supply voltag e (V)
Electricity supply frequency (H z)
Water suppl y tem peratu re (° C)
Water suppl y pressu re (kPa)
Suppli ed steam pressure (kPa)
Suppli ed steam tem peratu re (° C)
Suppli ed g as type
Suppli ed g as pressure (kPa)
Conditions during the wetting of the load
Water suppl y tem peratu re (° C)
Water suppl y h ardn ess (mm ol/l)
Water suppl y con ducti vity (µ S/cm ) a
Water supply alkalinity (m m ol/l ) a
Washing m achine used (m odel and rated capacity)
Con ditions du rin g the conditioning of the load
Am bient tem perature (° C) a
Hum idity (%) a
Tum ble dryer used for bon e dryin g a (m odel an d rated capacity)
Bone d ry con versi on factor used a
Con ditions durin g the n orm ali zi ng of the l oad
Water suppl y tem peratu re (° C)
Water suppl y h ardn ess (mm ol/l)
Water suppl y alkalinity (m m ol/l) a
Water supply con ducti vity (µ S/cm) a
Method used to prepare the water accordin g to EN 60734
Page n um ber:
a
To be d eclared onl y when appli cable.
Num ber of pag es in this report:
I EC PAS 631 24:201 7 © I EC 201 7
– 45 –
Annex E
(normative)
Procedure to determine test load size where rated capacity is not declared
E.1
General
This annex sets out the method for the determ ination of test load mass when rated capacity
is not declared.
E.2
Determination of the volume of the clothes container
The volum e of the clothes container shall be done in accordance with CLC/TS 50640: 201 5,
Annex K.
E.3
Determination of the test load
The test load mass shall be calculated as follows:
Test load mass , in kg = Vc / 30, 0
where:
Vc
= the clothes container volum e ( Vc in litres)
– 46 –
I EC PAS 631 24:201 7 © I EC 201 7
Annex F
(normative)
Flexible initial moisture content method
F.1
General
This annex sets out an approach that form s the basis of a standard which characterizes the
energy consum ption of a dryer over a wide range of initial moisture contents . Using this
approach, the energy consum ption of a dryer can be accurately determined for an y specified
initial moisture content (within a defined range) without th e need for additional testing. As
the energ y consum ption of most dryers is highl y linear with respect to initial moisture
content , this approach has been found to be accurate for m ost dryer types.
This m ethod allows the perform ance param eters energy consum ption and programme time
for a specific initial moisture content to be calculated from energ y consumption and drying
tim es measured for two other initial moisture contents . I f the linear relationship is known,
energy consumption and programme time can be calculated by linear interpolation for an y
initial moisture content between 45 % and 90 %.
A linear relationship is described as:
Y= b
xx+
a
where
y
b
x
a
is the perform ance parameter (energy consumption or programme time );
is the slope (as calculated in F. 3);
represents the initial moisture content µ ;
is the constant part of the regression line (as calculated in F. 3).
This method is onl y valid if the drying process reaches the final moisture content stated in
Table 3 on every test ru n .
F.2
Procedure
Two test series shall be performed on a single tumble dryer as described in Clause 8 but
with initial moistu re contents between 45 % and 90 %. The m inim um difference between the
mean initial moistu re contents of the two test series shall not be less than 30 %. The initial
moistu re content of every test ru n in each test series shall be maintained within a tolerance
of ± 5 %.
For condenser tumble dryers , it is recom mended that the external water drain is used.
For non-automatic tum ble dryers, the maximum programm e time should be considered.
F.3
Evaluation
For each of the test runs energ y consumption Em j , time tm i , and final moisture content µ fj
shall be recorded. Energy consum ption and programme time shall be corrected regarding the
measured final moistu re content and conditioned m ass as follows:
I EC PAS 631 24: 201 7 © I EC 201 7
Corrected prog ramm e ti me :
– 47 –
ti
Corrected energy consum ption:
Ei
=
t mi
=
( m i − m f 0) W
( m i − m f j) W0
Emj
( μi − μ f 0) W
( μi − μ f j) W0
‘ a ’ and ‘ b ’ are calculated as follows:
1
b= n
∑ in=1 ( xi − x )( yi − y )
1
n
∑ in=1 ( xi − x ) 2
=
∑ in=1 ( xi − x )( yi − y ) SSxy
=
∑ in=1 ( xi − x ) 2
SSxx
Where x represents the moi stu re content and y is the corresponding corrected energy
consum ption or prog ram me tim e , x is the arithm etic mean of the in iti al m oistu re con tent ,
and y the arithm etic mean of the corrected measurands.
i
a = y − bx
For an y required i nitial moistu re con tent x the corresponding energ y consum ption and
prog ram me tim e is then calculated by:
y = b× x+ a
where
a
and
b
are the values as calculated above.
– 48 –
I EC PAS 631 24: 201 7 © I EC 201 7
Annex G
(normative)
Performance testing of steam heated tumble dryers
G.1
General
This annex specifies the instrumentation, installation, test procedure and calculation of energy
consum ption for steam heated tumble dryers.
G.2
Types of steam heating – Steam heated tumble dryers
All steam heated tum ble dryers are indirect steam heated meaning that the steam energy is
transferred to the dryin g air via a heat exchanger (steam battery). The energy of the
condensate water can be recovered and shall be subtracted from the total steam energy.
G.3
Specification of steam properties
G.3.1
Type of steam
The steam shall be dry saturated steam. Required steam pressure is set by the tum ble dryer
manufacturer instructions. Maxim um pressure for an y test is lim ited to 1 , 4 MPa and with a
corresponding tem perature of 1 98 °C.
G.3.2
Steam generator
The steam generator shall be large enough to supply dry saturated steam to the dryer under
test at the given steam pressure and flow specified by the manufacturer throughout the full
test procedure. I f dry saturated steam not can be guaranteed a super heater shall be added to
the steam boiled so slightl y superheated steam is produced.
The inlet water quality to the steam boiler shall be in accordance with EN 1 2953-1 0.
G.4
Equipment and instrumentation
G.4.1
G.4.1 .1
Test equ ipment for measu ring the characteristics of steam
Flow meter for measu rement of steam velocity and mass flow
Flow meter intended for m easurement of steam flow. The flow m eter shall be able to tolerate
the required pressure and tem perature range of supplied steam.
G.4.1 .2
Pressure sensor for measurement of the steam pressure
Pressure transducer intended for measurem ent of steam and wi th a pressure range from 0 to
1 , 4 MPa.
G.4.1 .3
Temperature sensor for measurement of the steam and condensate
temperature
Tem perature sensor intended for incoming steam temperature measurem ent: temperature
range from 0°C to 200°C.
Temperature sensor intended for condensate tem perature measurem ent: temperature range
from 0°C to 200°C.
I EC PAS 631 24:201 7 © I EC 201 7
G . 4. 1 . 4
– 49 –
S c a l e fo r m e a s u re m e n t o f t h e m a s s o f t h e c o n d e n s a t e
Scale to be used for mass measurement of the condensate.
G . 4. 1 . 5
Steam
cal cu l ato r
To calculate the steam energy transferred to the tumble dryer a steam calculator shall be
used.
The calculator shall follow and support following standard: Form ulation I APWS I F 97 for
calculation of the energ y (I APWS I ndustrial Formulation 1 997 for the Th erm od ynam ic
Properties of Water and Steam)
The calculator shall be able to correctly calculate the steam energ y for dry saturated steam
and for superheated steam. The calculator shall also preferabl y be equipped with a wet steam
alarm .
G . 4. 2
I n s t ru m e n t s
P a ra m e t e r
Unit
M inimum
re s o l u t i o n
Minimum
a c c u ra c y
Steam flow
m /sec
± 0, 1 %
±1 %
Tem peratu re
°C
± 0, 1 K
±1 K
Pressure
kPa
± 0, 05 % of set ran ge
± 0, 2 % of set rang e
Masses
g
See 5. 6. 2 I nstrum ents
G . 4. 2 . 1
M e a s u re m e n t s
P a ra m e t e r
Unit
Minimum
Steam energy
kWh
±2%
Con densation water m ass
g
±1 %
a c c u ra c y
Ad d i t i o n a l
r e q u i re m e n t s
The com bined m inim um
accuracy refers to the
steam calculation usin g
the steam calculator,
tem peratu re and pressu re
sensor d escribed above
NOTE I t is probabl y not possible to fin d one set of equipm ent that covers the full requ ired pressure an d flow
ran ges for all kin d of dryers un der test.
I f the maximum steam pressure is set lower than 1 , 4 MPa the requirem ents for the equipm ent
regarding m ax pressure and temperature m ay be lowered as long as it is in line with the
pressure and steam temperature delivered by the boiler.
G.5
G.5.1
I n s ta l l a ti o n
G e n e ra l
I t is very im portant that all instrum entation is installed according the m anufacturers exact
instructions. The installation can be made according two alternatives and the difference
between the alternatives is the way the amount condensate is m easured.
G.5.2
I n s t a l l ati o n
o f t h e m e a s u re m e n t e q u i p m e n t fo r i n d i re c t s t e a m h e a t e d t u m b l e r
d ry e rs . ( Al t e rn a t i v e 1 )
Figure G. 1 shows a schem atic installation of the measurem ent equipment for indirect steam
heated tumble dryers.
– 50 –
I EC PAS 631 24:201 7 © I EC 201 7
The steam flow entering the m easurement instrum ents shall be as undisturbed as possible
and therefore the steam measurement equipm ent (1 ) shall be placed together and with a
straight part of the steam suppl y pipe prior and after the instruments according to the
instrument suppliers instruction.
Also the tube diam eter shall be according to the instructions and shall not change in diam eter
from where the straight suppl y steam tube starts and ends.
The steam trap (4) shall be placed so condensed water can be drained from the suppl y steam
tube.
The shut off valve (2) and the steam measurement equipment (1 ) shall be placed as close as
possible to the dryer under test. The steam suppl y pipe from the steam measurement
equipm ent (1 ) to the dryer under test shall not be longer than 1 , 5 m .
After the steam battery (6) a tem perature sensor (8) shall be installed and close to the sensor
a steam trap (7) shall be placed.
1
4
2
3
5
8
6
7
IEC
Key
1
suppl y steam m easurem ent equipm ent consistin g of steam flow m eter, tem perature sen sor an d pressure
transd ucer.
2
shut off val ve
3
indi rect steam heated tum ble d ryer
4
steam trap
5
drain val ve
6
steam battery
7
steam trap
8
tem peratu re sensor
Figure G.1 – Schematic installation of the measurement equipment
for steam heated tumble dryers (Alternative 1 )
I EC PAS 631 24:201 7 © I EC 201 7
G . 5. 3
I n s ta l l ati o n
d ry e rs .
– 51 –
o f t h e m e a s u re m e n t e q u i p m e n t fo r i n d i re c t s t e a m h e a t e d t u m b l e
( Al t e rn a t i v e 2 )
Figure G. 2 shows an alternative schem atic installation of the m easurement equipm ent for
indirect steam heated tumble dryers. This installation will give a possibility to com pare the
amount of steam supplied to the dryer with the am ount of condensate water recovered in the
tank.
The steam flow entering the measurement instruments shall be as undisturbed as possible
and therefore the steam measurement equipment (1 ) shall be placed together and with a
straight part of the steam supply pipe prior and after the instrum ents according to the
instrument suppliers instruction.
Also the tube diam eter shall be according to the instructions and shall not change in diam eter
from where the straight suppl y steam tube starts and ends.
The steam trap (4) shall be placed so condensed water can be drained from the suppl y steam
tube.
The shut off valve (2) and the steam measurement equipment (1 ) shall be placed as close as
possible to the dryer under test. The steam suppl y pipe from the steam measurem ent
equipm ent (1 ) to the dryer under test shall not be longer th an 1 , 5 m .
After the steam battery (6) a tem perature sensor (8) shall be installed and close to the sensor
a steam trap (7) shall be placed.
The condensate is recovered in a water tank (1 2) placed on a scale (1 0).
The condensate water hose from the steam trap to the tank is equipped with a drain valve (9)
and a shut off valve (1 1 ). The hose shall not have an y ph ysical connection with the tank in
order not to disturb the m ass m easurement of the condensate water.
– 52 –
1
4
I EC PAS 631 24:201 7 © I EC 201 7
2
3
11
12
5
8
6
7
9
10
IEC
Ke y
1
suppl y steam m easurem ent equipm ent consisting of steam flow m eter, tem perature sen sor and pressure
transd ucer.
2
shut off val ve
3
indi rect steam heated tum ble d ryer
4
steam trap
5
drain val ve
6
steam battery
7
steam trap
8
tem peratu re sensor
9
drain val ve
10
scale
11
shut off val ve
12
water tank
F i g u re G . 2 – S c h e m a t i c i n s t a l l a t i o n
fo r s t e a m
G.6
G.6.1
h eated
o f t h e m e a s u re m e n t e q u i p m e n t
t u m b l e d ry e rs ( Al t e rn a t i v e 2 )
P re p a ra t i o n fo r t e s t i n g
G e n e ra l
The ambient conditions shall follow the specifications given in 5. 2. The tum ble dryer shall be
installed according to the m anufacturer’s instructions. The dim ension of the steam hoses shall
be in accordance with the installation instructions.
G.6.2
I n d i re c t h e a t e d t u m b l e d ry e r i n s t a l l e d
a c c o rd i n g t o
Al t e rn a t i v e 1
The tum ble dryer shall be prepared for testing according to Clause 6 with following additions:
Before the start of a test series the tumble dryer under test shall be run once with a full test
load according to Table 4. After this initial run of the tumble dryer under test a test series shall
start within 2 d of the initial run but not sooner than 1 d after the cleaning run. An y remaining
I EC PAS 631 24:201 7 © I EC 201 7
– 53 –
condensate within the test tum ble dryer itself shall not be rem oved between the initial run and
the start of a test series.
G.6. 3
I n d i re c t h e a t e d t u m b l e d ry e r i n s t a l l e d
a c c o rd i n g t o a l t e rn a t i v e 2
The tum ble dryer shall be prepared for testing according to Clause 6 with following additions:
Before the start of a test series the tum ble dryer under test shall be run once with a full test
load according to Table 4. After this initial run of the tum ble dryer under test a test series shall
start within 2 d of the initial run but not sooner than 1 d after the cleaning run. After this initial
run the drain valve (9) shall be opened in order to drain the condensate collected in the
condensate hose. The am ount of water (see G.7. 3) in the tank (1 2) shall be reset to the start
level. An y other rem aining condensate within the test dryer itself may not be rem oved
between the initial run and the start of a test series.
G.7
G.7.1
T e s t s fo r p e rfo rm a n c e
G e n e ra l
This subclause contains inform ation about the test procedure for perform ance m easurem ents
on steam heated tum ble dryers and the additional requirements needed.
G.7.2
P e rfo rm a n c e t e s t i n g
o f i n d i re c t s t e a m h e a t e d t u m b l e d ry e r i n s t a l l e d
a c c o rd i n g
t o a l t e rn a t i v e 1
All performance tests shall be according to Clause 7 and according to following additional
requirem ents:
The tests shall be performed with the steam pressure and flow rate recommended by the
manufacturer.
Before each test run the steam hoses outside the dryer under test shall be flushed with steam
ensuring that the steam is as dry as possible wh en entering into the dryer under test. Close
the shut off valve (2) and open the drain valve (5) and flush the steam until no condensate is
visible in the valve outlet. The flushing shall occur immediate before the start of the test run.
Close drain valve (5) and open the shut off valve (2) and start the test run.
The measured values from the steam m easurement equipment (steam pressure, steam flow
rate and steam temperature shall be recorded by the steam energ y calculator and required
output data shall be calculated and reported according to G.8. 2. 1 .
The mass of steam (kg) calculated by the Steam energy calculator shall be recorded and
reported according to G. 8. 2. 3.
The average tem perature of the condensate shall be recorded via the temperature sensor (8).
G.7.3
P e rfo rm a n c e t e s t i n g
o f i n d i re c t h e a t e d t u m b l e d ry e rs i n s t a l l e d
a c c o rd i n g t o
Al t e rn a t i v e 2
G.7.3. 1
G e n e ra l
All performance tests shall be according to Clause 7 and according to following additional
requirem ents:
The tests shall be performed with the steam pressure and flow rate recommended by the
manufacturer.
– 54 –
I EC PAS 631 24:201 7 © I EC 201 7
The tank (1 2) shall be filled with water. The am ount of water shall be approximately 4 tim es
the expected am ount of condensate and the vertical water distance between the steam outlet
in the tank and the water surface shall be so high that all steam not yet condensed will
condensate before breaking the water surface. The mass of the tank (1 2) with water shall be
recorded.
Before each test run the steam hoses outside the dryer under test shall be flushed with steam
ensuring that the steam is as dry as possible wh en entering into the dryer under test. Close
the shut off valve (2) and open the drain valve (5) and flush the steam until no condensate is
visible in the valve outlet. The flushing shall occur immediate before the start of the test run.
Close drain valve (5) and open the shut off valve (2) and start the test run.
The m easured values from the steam m easurement equipm ent (steam pressure, steam flow
rate and steam tem perature shall be recorded by the steam energ y calculator and required
output data shall be calculated and reported according to G.8. 3. 1 .
The average temperature of the condensate shall be recorded via the temperature sensor (9).
After each test run shut off valve (1 1 ) shall be closed and valve (9) shall be opened. The
water in the condensate water hose shall be collected and poured into the tank (1 2) When the
condensate water hose is em pty the shut off valve (1 1 ) shall be opened again so an y
rem aining water in the condensate water hose can flow into the tank (1 2).
The total mass of the tank (1 2) shall now be recorded.
G.7.3.2
Control of accuracy
The m ass of the steam supplied to the tumble dryer as calculated by the steam energ y
calculator can be com pared with the m ass of the condensate calculated as the difference of
the m ass of the tank after and before the test run. I f the mass values differ more than 1 0 %
the run shall be regarded as not valid.
G.8
Assessment of performance
G.8.1
General
This subclause sets out the evaluation methods for the assessm ent of the energ y
perform ance of steam heated tum ble dryers.
G.8.2
G.8.2.1
Evaluation of performance of indirect heated tumble dryer installed according
to alternative 1
General
This subclause sets out the evaluation of supplied steam energ y, energy recovered in the
condensate and the total steam energ y supplied to indirect heated tumbler dryers installed
according to Alternative 1 .
G.8.2.2
Evalu ation of supplied steam energy
The steam energ y supplied to an indirect heated tum bler dryer Eist is the energ y measured by
the steam energy calculator.
G.8.2.3
Evalu ation of the energy to be recovered through the condensate
The recovered energ y of condensate water Ecs is calculated as:
Ecs = Mdst x Tc /860
I EC PAS 631 24:201 7 © I EC 201 7
– 55 –
Tc = Tcs if Tcs is < 1 00°C
Tc = 1 00°C if Tcs
where
Mdst
Tc
Tcs
Wcs
1 /860
G.8.3
is
is
is
is
is
the
the
the
the
the
is ≥ 1 00°C
mass of steam supplied to the tum ble dryer during a test run.
condensate temperature
tem perature recorded by the tem perature sensor (8)
energy of the recovered condensate
energy equivalent
Evalu ation of performance of indirect heated tumbler dryers installed
according to alternative 2
G.8.3.1
General
This section sets out the evaluation of supplied steam energ y, energ y recovered in the
condensate and the total steam energy supplied to indirect heated tum ble dryer installed
according to Alternative 2.
G.8.3.2
Evaluation of supplied steam energy
The steam energ y supplied to an indirect heated tumble dryer Eist is the energy m easured by
the steam energ y calculator.
G.8.3.3
Evaluation of the energy to be recovered through the condensate
The recovered energy of condensate water is calculated as:
Mcw = MT1 – MT2
Tc = Tcs if Tcs is < 1 00°C
Tc = 1 00°C if Tcs
is ≥ 1 00°C
Ecs = Mcw x Tc /860
where
Mcw
MT1
MT2
Tc
Tcs
Wcs
1 /860
G.8.4
is
is
is
is
is
is
is
the
the
the
the
the
the
the
recovered amount of condensate water;
mass of the tank (1 2) at the end of the procedures described in G. 7. 3;
mass of the tank (1 2) at the start of the test run ;
condensate temperature;
tem perature recorded by the temperature sensor (8);
energ y of the recovered condensate;
energ y equivalent.
Evaluation of total energy su pplied to the tumbler dryer by steam
The total steam energy Est for an indirect steam heated tum ble dryer is equal to:
Est = Eist - Ecs
– 56 –
G.9
I EC PAS 631 24:201 7 © I EC 201 7
Data to be reported
The value of the total steam energy Est and the m ass of the supplied steam Mdst shall be
reported in Table D. 2.
I EC PAS 631 24: 201 7 © I EC 201 7
– 57 –
An n e x H
(informative)
P e rfo rm a n c e te s ti n g o f g a s h e a te d t u m b l e d rye rs
H.1
G e n e ra l
This annex gives references to CEN standards related to the safety and measurem ent of gas
fired
.
t u m b l e d ry e rs
H.2
I n s ta l l a ti o n ,
t e s t i n g p ro c e d u re a n d c a l c u l a t i o n o f s u p p l i e d g a s e n e rg y
The dryer shall be installed according to reference given in a future standard, EN ZZZZZ.
NOTE At the tim e of introd ucing this PAS, the concerned docum ent was not ready for pu blication, nor gi ven an
EN num ber.
All safety issues required shall be followed.
Specification for the gas energy measurement is given in Table 2.
The testing procedure shall follow the procedure given in Clauses 6, 7 and 8.
Formulae for calculating the supplied gas energy can be found in EN 1 458-2.
– 58 –
I EC PAS 631 24:201 7 © I EC 201 7
An n e x I
(informative)
M e a s u re m e n t o f e x h a u s t a i r vo l u m e
I.1
P ro c e d u re
The volumetric flow rate of exhaust air shall be measured while the
is operating
without a load and with the heater switched off. The
shall be attached to the
standard exhaust described in Annex B and the m easurem ent shall be m ade using the
equipm ent described in EN I SO 51 67-1 .
t u m b l e d ry e r
tu m b l e
d ry e r
The pressure at the outlet of the standard exhaust and in the vicinity of the dryer relative to
the environment shall be maintained at 0 Pa at the operating flow rate. The air temperature,
humidity and pressure shall be maintained at 23 °C, 55 % RH and 1 ,01 3 × 1 0 5 Pa
respectivel y.
NOTE A form al procedu re for this test is under devel opm ent.
I.2
E xh a u s t a i r vo l u m e
Exhaust air volum e V is calculated from the volum etric flow rate and the duration of the
and expressed in cubic metres:
ru n
V = F×t
where
F
t
is the volum etric flow rate m easured according to EN I SO 51 67-1 ; and
is the average
.
p ro g ra m m e t i m e
te s t
I EC PAS 631 24:201 7 © I EC 201 7
– 59 –
Annex J
(normative)
Measurement of the textile drying temperature
J.1
General
The textile drying tem perature shall be m easured by temperature loggers placed am ong the
test load in the drying basket and following the load during the drying procedure.
J.2
Specification of the loggers
The specification of the tem perature logger is given in Table J . 1 .
Table J.1 – Specification of temperature logger suitable for
temperatu re measurement for both washing and drying
Tem peratu re range
0 °C – 1 50 °C
Accuracy
≤ 0, 5 °C over full ran ge
Resol ution
≤ 0, 1 °C
Response tim e TC (1 0 – 90 %) a water
≤ 2 m in
Response tim e TC (1 0 – 90 %) a m oving ai r(2 m /sec)
≤ 5 m in
Sam pling rate
≤ 10 s
Max m ass
70 g
a
J.3
TC (1 0 %–90 %) is the tim e it takes for the sensor to traverse between 1 0 %
and 90 % of its final valu e. Response tim e can also be expressed as a TC 63 %
val ue. The 63 % fi gu re is the ti m e for the sensor to reach 63 % of its final val ue.
TC 1 0 %–90 % an d the TC 63 % value are of approxi m ately the sam e
m agnitude for a given sensor.
Preparation of the loggers before measurement
The tem perature logger shall be placed in a textile pocket made of the sam e fabric as the test
load . The size of the pocket shall not be excessivel y larger than the logger. By doing this the
logger will be protected from extensive shocks when hitting the basket walls and also an y
damage to the test load will be minim ized. The pocket shall be closed by cl ips or by an y other
means.
I n order to make the logger follow the motion pattern of the test load as close as possible the
pocket shall be attached to one of the m edium -sized test sheets.
J.4
Number of loggers
Following number of tem perature loggers shall be placed in the tu mble dryer depending on
the size of the dryer.
The num ber of tem perature loggers to be placed in the dryer is dependent on the size of the
dryer as described in Table J. 2.
– 60 –
I EC PAS 631 24:201 7 © I EC 201 7
Table J.2 – Nu mber of temperatu re loggers to be used
during a textile drying temperature measurement
J.5
Size of drying basket
Number of temperature loggers to use
< 200 l
2
200 l – 1 000 l
3
> 1 000 l
4
Measuring the temperature
The loggers shall be placed in the middle of the load before the d rying sequence is started. I f
more than one logger is used they shall be placed evenl y within the drum. The loggers shall
follow the drying textiles throughout the drying process until the end of the programme .
Directl y after the programme end the loggers shall be removed and the logged data loaded to
a computer.
J.6
Presenting the result
The tem perature data obtained by the logger shall preferabl y be presented as a curve
showing the temperature during the whole drying process. The result can be presented as
individual tem perature profiles for each logger or as a m ean value of the loggers for each time
point.
I f m ax drying tem perature shall be reported max drying tem perature shall be defined as the
highest tem perature measured during the drying cycle by an y logg er.
I EC PAS 631 24:201 7 © I EC 201 7
– 61 –
Bibliography
[1 ]
EN 1 458-2, Domestic direct gas-fired tumble dryers of types B22D and B23D, of
[2]
EN 60704-1 : 201 0, Household and similar electrical appliances – Test code for the
determination of airborne noise – Part 1: General requirements (IEC 60704-1:2010)
[3]
EN I SO 51 67-1 , Measurement of fluid flow by means of pressure differential devices
[4]
nominal heat input not exceeding 6 kW – Part 2: Rational use of energy
inserted in circular cross-section conduits running full – Part 1: General principles and
requirements (ISO 5167-1)
I EC Guide 1 09: 2003, Environmental aspects – Inclusion in electrotechnical product
standards
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