2/7/EN/6
Swirl Diffuser
Type VDW
recommended for room heights from approx. 2.60 . . . 4.00 m
TROX GmbH
Heinrich-Trox-Platz
D-47504 Neukirchen-Vluyn
Telephone +49 / 28 45 / 2 02-0
Telefax
+49 / 28 45 / 2 02-2 65
e-mail trox@trox.de
www.troxtechnik.com
Contents · Description
Description
Discharge Characteristics
Constructions · Dimensions
Materials
Installation · Assembly
Nomenclature
Preliminary Selection
Spectral Data
Acoustic Data
Aerodynamic Data
Order Details
2
2
3
4
6
6
7
7
7
8
11
18
In addition to the existing range of TROX swirl diffusers, the
type VDW swirl diffuser with manual adjustment has been
developed.
This enables the direction of discharge to be altered on site
to cater for changes in room layout or partitions. Due to the
rotary swirling motion of the air discharge, induction of room
air occurs very quickly, resulting in a rapid decay of supply
air velocity and temperature differential. Air change rates of
30 per hour can be achieved with supply air temperature
differentials of +10K to –10K.
The diffuser can be supplied with either circular or square
face plate depending on architectural requirements,
additionally with white or black air control blades. Air is
supplied via top or side entry plenum boxes.
The type VDW can be used for either supply or extract air
application. For supply air, special control elements are
required. These are not necessary for use in the extract air
mode.
Construction VDW - R, Size 500 x 24
Construction VDW - R, Size 600 x 48
with black air control blades
with black air control blades
Construction VDW - Q, Size 600 x 24
Construction VDW - Q, Size 825 x 72
with white air control blades
with black air control blades
Discharge Characteristics
The manual adjustment of the VDW swirl diffuser means that
architectural changes, for instance relocation of lightweight
partition walls, can be catered for by changes in discharge
pattern. Directions of discharge can be altered by
adjustment of the control blade settings.
For sizes 300 x 8, 400 x 16, 500 x 24, 600 x 24 and 625 x 24
the air control blades are set as standard to external swirl
and for sizes 600 x 48, 625 x 54 and 825 x 72 the air control
blades of the outer blade ring are set to external swirl and
those of the inner blade ring to internal swirl.
The flow visualisation opposite shows the air discharge
characteristics, control blades set for internal swirl.
Positions of air control blades
External swirl
(normal position)
Vertical
air discharge
Internal swirl
Discharge Characteristics for sizes 300 x 8, 400 x16, 500 x 24, 600 x 24 and 625 x 24
All air control blades
set to external swirl
Air control blades set
half to external and
half internal to swirl
Air control blades in each quartile of
face are set in the same direction, adjacent
quartiles set one internal one external swirl
3
Constructions · Dimensions
Constructions
Adjustable swirl diffusers type VDW are supplied in the sizes
listed below:
Size
Size
Size
Size
Size
Size
Size
Size
300 x 8
400 x 16
500 x 24
600 x 24
600 x 48
625 x 24
625 x 54
825 x 72
with 8 air control blades,
with 16 air control blades,
with 24 air control blades,
with 24 air control blades,
with 48 air control blades,
with 24 air control blades,
with 54 air control blades,
with 72 air control blades,
The face plate can be circular or square to suit the
architectural requirements, except for sizes 625 x 54 and
825 x 72, which are only supplied in square format.
The removeable face plate is held in the plenum box with a
centre screw fixing. The head of the screw is covered with
a decorative cap.
The plenum box is available with side or top entry spigot,
with volume control damper and/or lip seal on request.
If a circular diffuser face is ordered fitted with a side entry
plenum box, a 35 mm extension piece is fitted to the
plenum, as shown on Page 5 (VDW-R-H).
For simple adjustment of the volume flow, on request the
plenum box can be provided with a test connection for
measurement of a reference pressure and a volume control
damper operated by sheathed cables. The characteristic
curve of pressure reading versus volume flow rate for each
size of plenum box is supplied.
Note: If a larger size side entry plenum is fitted to a diffuser
face, this should be considered in relation to performance
(lower noise levels and pressure drop).
Size 300 x 8
300
Size 600 x 24/Size 625 x 24
298
600
625
Size 400 x16
400
598
623
398
Size 500 x 24
500
4
498
Test nipple
Inclined manometer
Plastic tube
Code
White sheathed cable damper open
Diffuser face
Green sheathed cable damper closed
Plenum box
Constructions · Dimensions
Size
B
D
H1
H2
P
K
AK Code for 1)
Diffuser Face
Circular Square
300 x 8
280
158
200
250
278
290
AK 013
AK 001
400 x 16
364
198
200
295
362
372
AK 014
AK 002
500 x 24
462
198
200
295
460
476
AK 015
AK 003
600 x 24
559
248
200
345
557
567
AK 016
AK 004
600 x 48
580
248
300
345
578
590
AK 017
AK 005
625 x 24
559
248
200
345
557
567
AK 016
AK 004
625 x 54
605
248
300
345
–
615
–
AK 006
825 x 72
796
313
300
410
–
806
–
AK 007
1) Only valid for VDW-...-H!
Size 600 x 48
Size 625 x 54
600
598
623
Size 825 x 72
Plenum Box
VDW-Q-...-H
VDW-...-V
K
8
H2
D
32
2)
VDW-R-...-H
K
8
35
H2
825
D
32
P
2)
2) Overall face dimension
5
Materials · Installation · Assembly
Materials
Installation
The face plate is in galvanised sheet steel. The surfaces are
pre-treated and powder coated white (RAL 9010).
The control blades are made from Polystyrol (PS 476L),
with black (similar to RAL 9005) as standard or white
(similar to RAL 9010) on request.
The plenum box is made from galvanised sheet steel, the
rubber lip seal.
All sizes are suitable for flush mounting into a ceiling.
If the diffuser is installed below a closed ceiling (i.e. freely
suspended) a stable discharge can be achieved if a
peripheral collar 50 mm is provided – available on
request.
Assembly
The plenum box is suspended using wires or slotted strips,
using the drilled holes in the plenum return edge or hanging
brackets when provided. For the side entry plenum box, a
self adhesive seal, supplied loose, must be fitted by the
client. The diffuser face is fitted to the plenum box by means
of centre fix screw locating in cross channel of the plenum
box.
Installation Flush to Ceiling
Installation with cut-out in Ceiling
Surface Mounting on Ceiling
Installation Suspended from Slab
Hangers by others
using factory drilled
holes in plenum
Self adhesive seal
fitted by others
6
Face plate installed using
a centre fix screw
6
Installation using
suspension brackets
Nomenclature · Preliminary Selection · Spectral Data
·
V
·
V
A, B
X
H1
v-H1
Nomenclature
L
in l/s:
in m3/h:
in m:
in m:
in m:
in m/s:
in m:
v-L
tZ
in m/s:
in K:
tL
in K:
A eff
in m2 :
pt
in Pa:
L WA in dB(A):
L W NC
:
L W NR
:
L pA, L pNC
:
L in dB/Oct.:
L W in dB/Oct.:
Supply air volume per diffuser
Supply air volume per diffuser
Spacing between two diffusers
Distance between diffuser centre and wall
Distance between ceiling and occupied zone
Time average air velocity between two diffusers
at distance from ceiling H1
Horizontal + vertical distance (X+H1)
discharge to the wall
Time average air velocity at wall
Temperature difference between supply air
and room air
Difference between core and room temperature
at distance L = A/2 + H1
or L = B/2 + H1
or L = X + H1
Effective outlet area
Total pressure drop (supply air)
A-weighted sound power level
NC rating of sound power level
L W NR = L W NC + 1
A-weighting and NC rating respectively of room
sound pressure level
L pA L WA – 8 dB
L pNC L W NC – 8 dB
Relative sound power level with respect to L WA
Octave band sound power level of regenerated
noise L W = L WA + L
Preliminary Selection (supply air)
V·max
Size
V·min
m3/h
L WA max
dB(A)
L W NC max
NC
L WA min
dB(A)
L W NC min.
NC
A eff
m2
15
54
40
34
20
20
0.0070
30
108
40
34
20
20
0.0140
468
40
144
40
34
20
20
0.0210
190
684
60
216
40
34
20
20
0.0295
600 x 48
230
828
100
360
40
34
20
20
0.0390
625 x 24
190
684
60
216
40
34
20
20
0.0295
625 x 54
235
846
120
432
40
34
20
20
0.0470
825 x 72
350
1260
155
558
40
34
20
20
0.0730
l/s
m3/h
l/s
300 x 8
70
252
400 x 16
110
396
500 x 24
130
600 x 24
Octave band spectrum available on request!
7
Acoustic Data Type VDW-...-V
Supply air
Correction to diagrams 1, 2 and 3:
Volume control damper setting
Size
Damper angle
pt
300 x 8
0°
45°
90°
x 1.0
x 1.2
x 1.8
L WA / L W NC
pt
400 x 16
–
–
–
x 1.0
x 1.1
x 2.0
L WA / L W NC
pt
500 x 24
–
–
+1
x 1.0
x 1.4
x 2.8
–
+3
+6
L WA / L W NC
1
3
Sound Power Level and Pressure Drop
Size 300 x 8
Sound Power Level and Pressure Drop
Size 500 x 24
200
45
35
50
50
40
70
5
30
l/s
m 3/h 150
2
Sound Power Level and Pressure Drop
Size 400 x16
100
50
45
80
40
45
35
30
40
40
dB
(A
)
in
L
30
W
A
20
35
25
30
20
Pressure drop pt in Pa
60
L
W
25
NC
15
4
·
V
20
10
40
150
8
50
60
200
l/s
80
m 3/h 300
100
150
400
500
200
600 700
20
·
V
L
40
dB
(A
)
35
in
W
NC
10
25
15
L
W
A
20
30
25
30
30
20
Pressure drop pt in Pa
Pressure drop pt in Pa
45
100
50
70
200
100
300
200
500
700
300
1000
Acoustic Data Type VDW-...-V
Supply air
Correction to diagrams 4 to 7:
Volume control damper setting
Size
Damper angle
600 x 24
pt
625 x 24
L WA / L W NC
600 x 48
pt
625 x 54
L WA / L W NC
825 x 72
pt
L WA / L W NC
Sound Power Level and Pressure Drop
Size 600 x 24 and size 625 x 24
5
Sound Power Level and Pressure Drop
Size 600 x48
90°
x 2.8
–
+3
+5
x 1.0
x 1.6
x 3.4
–
+4
+9
x 1.0
x 1.3
x 3.3
–
+2
+4
Sound Power Level and Pressure Drop
Size 625 x 54
7
Sound Power Level and Pressure Drop
Size 825 x 72
Pressure drop pt in Pa
Pressure drop pt in Pa
Pressure drop pt in Pa
6
45°
x 1.3
Pressure drop pt in Pa
4
0°
x 1.0
9
Acoustic Data Type VDW-...-H
Supply air
Correction to diagrams 8 to 10:
Volume control damper setting
Size
Damper angle
pt
300 x 8
0°
45°
90°
x 1.0
x 1.3
x 2.2
L WA / L W NC
pt
400 x 16
–
+3
+5
x 1.0
x 1.2
x 2.3
L WA / L W NC
pt
500 x 24
–
+1
+3
x 1.0
x 1.5
x 3.4
–
+2
+3
L WA / L W NC
Sound Power Level and Pressure Drop
Size 500 x 24
150
45
150
W
45
L
50
40
45
in
4
dB 0
(A
)
35
20
10
7
20
·
V
40
l/s 30
m 3/h 100
9
50
150
100
70
200
300
150
200
150
50
45
45
40
30
40
in
dB
40
(A
)
35
50
NC
15
15
W
A
L
W
10
L
25
20
20
30
25
35
30
20
Pressure drop pt in Pa
70
·
V
7
30
m 3/h
10
40
150
50
200
70
100 l/s 150
300
400 500
200
300
900
7
40
50
70 l/s 100
200 m 3/h 300
400 500
Sound Power Level and Pressure Drop
Size 400 x16
100
·
V
W
A
L
W
NC
L
25
20
15
10
35
30
30
30
W
A
40
20
NC
15
50
25
15
25
20
L
20
30
30
25
35
in
dB
(A
)
40
Pressure drop pt in Pa
45
30
50
70
40
35
70
100
50
40
100
Pressure drop pt in Pa
10
Sound Power Level and Pressure Drop
Size 300 x 8
15
8
150
400 500
200
700 900
300
1200
400
Acoustic Data Type Typ VDW-...-H
Supply air
Correction to diagrams 11 to 14:
Volume control damper setting
Size
Damper angle
600 x 24
pt
625 x 24
L WA / L W NC
600 x 48
pt
0°
45°
90°
x 1.0
x 1.5
x 4.0
–
+2
+5
x 1.0
x 1.7
x 4.5
L WA / L W NC
pt
625 x 54
–
+4
+ 10
x 1.0
x 1.7
x 5.1
L WA / L W NC
pt
825 x 72
–
+5
+ 10
x 1.0
x 1.5
x 4.7
–
+5
+ 11
L WA / L W NC
50
L
45
35
W
A
in
dB
40
(A
)
30
35
L
25
7
L
L
W
NC
15
15
25
10
20
7
15
30
30
20
10
W
A
15
20
20
25
35
in
dB
(A
)
20
30
25
Pressure drop pt in Pa
35
30
40
30
40
20
40
50
45
40
50
70
40
70
45
100
45
Sound Power Level and Pressure Drop
Size 625 x 54
100
50
Pressure drop pt in Pa
13
Sound Power Level and Pressure Drop
Size 600 x 24 and size 625 x 24
W
NC
11
4
50
200
300 m 3/h 500
200
12
100 l/s 150
70
300
400
500
4
70
·
V
100 l/s 150
200
300 m 3/h 500
900 1200 1600
14
Sound Power Level and Pressure Drop
Size 600 x48
100
300
900 1200 1600 2200
Sound Power Level and Pressure Drop
Size 825 x 72
45
50
45
35
40
30
35
in
dB
(A
)
W
A
L
25
20
15
L
100 l/s
300
W
NC
20
W
NC
7
L
4
70
15
10
15
10
20
30
W
A
30
25
L
15
25
35
in
dB
(A
)
30
25
20
40
30
20
Pressure drop pt in Pa
45
50
40
30
40
40
50
70
35
40
20
Pressure drop pt in Pa
50
·
V
700
100
70
7
400 500
45
·
V
m 3/h
150
500
200
300
900
400 500
1200 1600 2200
700
·
V
4
100 l/s 150
200
500 m 3/h
300
900
400 500
700
1000
1200 1600 2200 3000
11
Acoustic Data
Extract air
Correction to diagrams 15 and 17:
Volume control damper setting
Size
300 x 8
Damper angle
pt
0°
45°
90°
Size
x 1.0
x 1.5
x 3.0
600 x 24
pt
L WA / L W NC
400 x 16
pt
pt
–
+7
+9
625 x 24
L WA / L W NC
x 1.8
x 4.1
600 x 48
pt
–
+4
+9
625 x 54
L WA / L W NC
x 1.0
x 1.8
x 4.1
825 x 72
pt
–
+3
+9
L WA / L W NC
15
Sound Power Level and Pressure Drop VDW-...-H
L WA / L W NC
17
Size
0°
45°
90°
x 1.0
x 2.0
x 5.6
–
+2
+9
x 1.0
x 2.0
x 5.6
–
+2
+10
x 1.0
x 2.3
x 6.5
–
+2
+11
Sound Power Level and Pressure Drop VDW-...-V
Size
Pressure drop pt in Pa
Pressure drop pt in Pa
16
Sound Power Level and Pressure Drop VDW-...-H
18
Pressure drop pt in Pa
Pressure drop pt in Pa
Sound Power Level and Pressure Drop VDW-...-V
Size
Size
12
Damper angle
x 1.0
L WA / L W NC
500 x 24
Correction to diagrams 16 and 18:
Volume control damper setting
Aerodynamic Data
Size 300 x 8
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
Diffuser arrangement:
single row or more than one row if B 4.00 m
21
Temperature Quotient
22
Square diffuser
Temperature Quotient tL / tZ
19
Spacing A
20
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
Distance L
Spacing A
13
Aerodynamic Data
Size 400 x 16
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
Diffuser arrangement:
single row or more than one row if B 4.00 m
24
Diffuser arrangement:
more than one row if B = 3.00 m
25
Temperature Quotient
26
Square diffuser
Temperature Quotient tL / tZ
23
Distance L
Spacing A
Spacing A
14
Spacing A or B
Aerodynamic Data
Size 500 x24
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
Diffuser arrangement:
single row or more than one row if B 4.00 m
29
Temperature Quotient
Temperature Quotient tL / tZ
27
Distance L
Spacing A
28
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
30
Square diffuser
Spacing A
15
Aerodynamic Data
Size 600 x 48
Example
Data given:
A hall measuring B x L x H = 24 m x 24 m x 3.40 m is to be
designed using VDW swirl diffusers for supply air.
Total volume flow rate
V· = 16000 l/s (57600 m3/h)
Supply air temperature
differential
Room temperature
tz = – 8 K
t R = 24 °C
For structural reasons, no diffuser should be placed closer
than 3 m to the external facade.
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0,71!
For adjustment of blade rings for external swirl, the
diagram values must be multiplied by 1.25!
Diffuser arrangement:
single row or more than one row if B 4.00 m
Initial observation:
Since the diffusers have to be arranged at a distance of
X = 3 m from the external facade, the remaining area
available for installation is 18 m x 18 m.
Consider a distance between rows B = 3.0 m
This results in 7 rows
16000 l/s
V· per row =
2280 l/s
7
For spacing of diffusers along the rows select A = 1.0 m.
This results in 19 diffusers per row.
The volume flow per diffuser then becomes
2280 l/s
= 120 l/s
19
33
Temperature Quotient
Temperature Quotient tL / tZ
31
Requirement: Air velocity v-H1 and v-L should not exceed
0.2 m/s. The regenerated noise level of each diffuser is
limited to L WA = 30 dB(A).
Spacing A
32
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
16
Distance L
34
Square diffuser
Spacing A or B
Aerodynamic Data
Sizes 600 x 24 and 625 x 24
Diagram 11:
Sound power level and pressure drop
= 27 dB(A) (LWNC = 21 NC)
LWA
= 12 Pa
pt
Diagram 36:
Square diffuser: more than one row
if B = 3.00 m
= H – 1.70 = 1.70 m
= 0.17 m/s
H1
v-H1
Diagram 37:
L
= H1 + A/2 = 2.20 m
tL / tZ = 0.05
= – 8 x 0.05 = – 0,4 K
tL
L
= H1 + X = 4.70 m
= 0.18 m/s
v-L
tL / tZ = 0.023
= – 8 x 0.023 = – 0.2 K
tL
133 off VDW - Q - Z - H / 600 x 24
At the required air change rate of 30 per hour, the noise
level requirements are met and the limiting air velocities not
exceeded.
Temperature Quotient
between two diffusers
at the wall
Diffuser arrangement:
single row or more than one row if B 4.00 m
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
37
Temperature Quotient
Temperature Quotient tL / tZ
35
Result:
Distance L
Spacing A
36
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
38
Square diffuser
Spacing A or B
17
Aerodynamic Data
Size 625 x 54
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
For adjustment of blade rings for external swirl, the
diagram values must be multiplied by 1.25!
Diffuser arrangement:
single row or more than one row if B 4.00 m
41
Temperature Quotient
Temperature Quotient tL / tZ
39
Distance L
Spacing A
40
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
18
42
Square diffuser
Spacing A or B
Aerodynamic Data
Size 825 x72
Correction!
For an installation below a continuous ceiling, the values
v-H1, v-L, and tL / tZ must be multiplied by a factor of 0.71!
For adjustment of blade rings for external swirl, the
diagram values must be multiplied by 1.25!
Diffuser arrangement:
single row or more than one row if B 4.00 m
45
Temperature Quotient
Temperature Quotient tL / tZ
43
Distance L
Spacing A
44
Diffuser arrangement:
more than one row if B = 3.00 m
Spacing A
46
Square diffuser
Spacing A or B
19
Order Details
Order Code
These codes do not need to be completed for standard products
VDW - R - Z - V - M - L
Circular
Square
R1)
Q
Supply air
Extract air
Z
A
/
600 x 24
/
/
Q 21
/
P1
IEE
OE
P
IEE
OE
P
Top entry plenum
Side entry plenum
Volume control damper
with adjustment lever
Volume control damper
with test connection
Spigot with lip seal
/
RAL 9016
State colour
IEE
OE
P
V
H
M
MN
IE
EE
EO
EE
EP
L
300 x 8
400 x 16
500 x 24
600 x 24
600 x 48
625 x 24
625 x 54
825 x 72
Size
1) Not available in sizes 625 x 54 and 825 x 72!
2) Only for supply air with side entry.
3) GE = Gloss level
Design changes reserved · All rights reserved © TROX GmbH (8/2008)
0
TE
EE 0
EE
EE
EE
EZ P1
EE
EE
EE
EE
EE
U
TE
EE
EE
EZ
EE
EE
EU
0
Standard finish
powder-coated
RAL 9010 (GE 50 %) 3)
Powder-coated
to RAL 9006 (GE 30 %) 3)
other colours
to RAL ... (GE 70 %) 3)
Supply air:
Extract air:
Q11 Extract air:
Q21 Supply air:
Extract air:
black air control blades
no air control blades
black air control blades
white air control blades
white air control blades
Specification Test
20
Adjustable swirl diffusers in square or circular face plates with
swirling horizontal discharge of supply air with high induction.
For air change rates up to approximately 30 per hour.
Consisting of a pressed front face with radially angled air
discharge sections incorporating adjustable directional air
control blades. Supplied with plenum box incorporating
special internal control elements, complete with circular top
or side entry spigots (with optional volume control damper, lip
seal or test connection for reference pressure measurement,
sheathed cable and test nipple). Plenum box has holes in the
top return edge for suspension or, when supplied, can be fixed
by hanging brackets. The face plate can be fitted and removed
by means of the centre fixing screw.
The control blades are made from Polystyrol (PS 476 L), with
black (similar to RAL 9005) as standard or white (similar to
RAL 9010) on request.
The plenum box is made from galvanised sheet steel, the
rubber lip seal.
Material:
The face plate is in galvanised sheet steel. The surfaces are
pre-treated and powder coated white (RAL 9010).
Order example
Make: TROX
Type: VDW - R - Z - V - M / 600 x 24 / Q21 / P1 / RAL 9016