Indoor Pool Design
and Dehumidification
Mike Herwald
Regional Sales Manager
March 7, 2011
Summary of Critical Design Parameters
● Design temperature approximately 2° higher than water temperature
● Design relative humidity 40-60%
● 4-8 Air changes/hour
● Design space pressure slightly negative
● Design 0.5 CFM/sq. ft. deck and pool area
● “Wash” exterior walls and windows with supplied conditioned air
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
90
85
85
PSYCHROMETRIC
CHART
85
W
ET
B
UL
B
TE
MP
ER
AT
UR
E
80
Normal Temperature
I-P Units
80
-°
F
80
SEA LEVEL
75
BAROMETRIC PRESSURE: 29.921 in. HG
75
95/78
75
86/60%
70
70
70
86/70
82/50%
60
80
%
90
93/74
65
65
%
60
86/50%
82/60%
65
55
60
55
%
70
60
45
50
40
10
15
20
30
35
8%
15%
40
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
45
50
55
60
65
MID
E HU
ATIV
REL
ITY
35
30
25
20
6%
20%
10% REL
25
40
%
30%
25
20
15
40
30
20
10
%
25
35
25
45
%
40
30
15
50
45
35
50
%
DEW POINT TEMPERATURE - °F
55
50
MIDITY
ATIVE HU
4%
10
0
2%
70
75
80
85
90
95
100
DRY BULB TEMPERATURE - °F
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
105
110
115
120
Consider this…
● Introduction of fresh air, in a controlled manner, will positively control
indoor pool humidity when it is most important: WHEN IT IS COLD OUT
and when building structures are coldest and most susceptible for
condensation formation
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
TMY Data
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
DESIGN PARAMETERS
VT McComas Hall
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
FAP WINTER MODE
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
FAP SUMMER MODE
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
$0.047/Kwh
$8.39/Million BTUH
FAP Cost to Operate
OCCUPIED HOURS
TEMPERATURES
DRY BULB
97.5
92.5
87.5
82.5
77.5
72.5
67.5
62.5
57.5
52.5
47.5
42.5
37.5
32.5
27.5
22.5
17.5
12.5
7.5
MCWB*
77
74.2
72.6
69.2
65.8
63
59.2
54.3
50.2
45.3
40.9
37.5
32.7
28.2
22.7
18.2
14.3
10
6.3
DP
69.1
66.5
66.2
62.8
59.6
57.6
53.9
48.0
43.8
37.7
32.8
30.9
25.7
20.6
11.0
4.9
3.0
-0.6
1.0
TOTAL HOURS*
OUTSIDE
AT CONDITION
AIR
2
42
113
338
359
369
302
393
262
231
223
199
220
161
117
47
34
16
4
12500
12500
12500
12500
12500
12500
10491
8008
6995
6070
5574
5414
5053
4803
4497
4375
4344
4294
4314
DEHUMID
DEHUMID
Condenser Heat
COIL
COIL
Available
Supply
Supply Air
TONS
COST
BTUH
Air Temp
Temp Deg. F
$8
$145
$370
$872
$675
$496
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
1,075,975
940,340
892,222
702,375
512,080
366,273
0
0
0
0
0
0
0
0
0
0
0
0
0
76.1
77.2
78.3
79.4
80.6
81.9
83.0
84.4
85.7
87.0
88.3
89.7
91.0
92.3
93.6
94.9
96.3
97.6
98.9
73.6
73.6
73.6
73.6
73.6
73.6
83.0
83.1
83.0
82.9
82.7
82.4
82.3
82.1
82.0
81.8
81.5
81.2
80.9
71.73
62.69
59.48
46.82
34.14
24.42
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Weather Bin Data, Roanoke Va.
2011 Munters Sales Meeting | Indoor Pool Dehumidification
$2,566
March 7, 2011
Required
No Heat
$0.047/Kwh
$8.39/Million BTUH
FAP Cost to Operate
OCCUPIED HOURS
TEMPERATURES
DRY BULB
97.5
92.5
87.5
82.5
77.5
72.5
67.5
62.5
57.5
52.5
47.5
42.5
37.5
32.5
27.5
22.5
17.5
12.5
7.5
MCWB*
77
74.2
72.6
69.2
65.8
63
59.2
54.3
50.2
45.3
40.9
37.5
32.7
28.2
22.7
18.2
14.3
10
6.3
DP
69.1
66.5
66.2
62.8
59.6
57.6
53.9
48.0
43.8
37.7
32.8
30.9
25.7
20.6
11.0
4.9
3.0
-0.6
1.0
Weather Bin Data, Roanoke Va.
TOTAL HOURS*
Cost to Heat
Condenser Air
Condenser Water
AT CONDITION
Supply Air
Reheat Credit
Heat Credit
2
42
113
338
359
369
302
393
262
231
223
199
220
161
117
47
34
16
4
$1
$43
$152
$559
$719
$871
$0
$138
$203
$270
$355
$410
$545
$467
$387
$176
$143
$75
$21
$1
$43
$152
$559
$719
$871
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$4.08
$85.66
$230.47
$689.38
$732.21
$545.95
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
Cond. Water Credit $2,288
$5,533
$2,346
$2,288
TOTAL $3,465
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Dehum Coil Costs $2,566
Heating Costs $5,533
Cond. Air Credit $2,346
Conventional Dehumidifier
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
$0.047/Kwh
$8.39/Million BTUH
MECH Cost to Operate
OCCUPIED HOURS
TEMPERATURES
DRY BULB
97.5
92.5
87.5
82.5
77.5
72.5
67.5
62.5
57.5
52.5
47.5
42.5
37.5
32.5
27.5
22.5
17.5
12.5
7.5
MCWB*
77
74.2
72.6
69.2
65.8
63
59.2
54.3
50.2
45.3
40.9
37.5
32.7
28.2
22.7
18.2
14.3
12
6.3
DP
69.1
66.5
66.2
62.8
59.6
57.6
53.9
48.0
43.8
37.7
32.8
30.9
25.7
20.6
11.0
4.9
3.0
10.5
1.0
TOTAL HOURS*
OUTSIDE
DEHUMID
DEHUMID
Condenser Heat
Required
No Heat
AT CONDITION
AIR
COIL
LAT / TONS
COIL
COST
Available
BTUH
Supply
Air Temp
Supply Air
Temp Deg. F
60.8 / 73.5
61.4 / 70
61.5 / 69.5
62.3 / 65.3
62.9 / 61.7
63.3 / 59.7
63.9 / 56.3
64.7 / 51.7
65.1 / 49
65.7 / 45.6
66.1 / 43.4
66.2 / 42.6
66.5 / 40.6
66.8 / 39.1
67.1 / 36.9
67.3 / 36.1
67.3 / 35.8
67.1 / 36.9
67.4 / 35.6
$8
$162
$433
$1,217
$1,222
$1,214
$937
$1,121
$707
$581
$534
$468
$493
$347
$238
$93
$67
$33
$8
1,103,279
1,050,474
1,043,104
980,291
926,585
896,043
844,601
776,700
735,216
685,218
651,840
640,046
609,954
587,009
553,739
541,658
537,934
553,739
534,206
76.1
77.2
78.3
79.4
80.6
81.9
83.0
84.4
85.7
87.0
88.3
89.7
91.0
92.3
93.6
94.9
96.3
97.6
98.9
70.2
66.8
66.1
65.8
65.5
64.9
64.6
64.3
63.9
63.5
62.9
62.2
61.6
60.9
60.4
59.6
58.8
57.8
57.1
2
42
113
338
359
369
302
393
262
231
223
199
220
161
117
47
34
16
4
Weather Bin Data, Roanoke Va.
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
4309
TOTALS
2011 Munters Sales Meeting | Indoor Pool Dehumidification
$9,882
March 7, 2011
$0.047/Kwh
$8.39/Million BTUH
MECH Cost to Operate
OCCUPIED HOURS
TEMPERATURES
DRY BULB
MCWB*
97.5
92.5
87.5
82.5
77.5
72.5
67.5
62.5
57.5
52.5
47.5
42.5
37.5
32.5
27.5
22.5
17.5
12.5
7.5
77
74.2
72.6
69.2
65.8
63
59.2
54.3
50.2
45.3
40.9
37.5
32.7
28.2
22.7
18.2
14.3
10
6.3
DP
69.1
66.5
66.2
62.8
59.6
57.6
53.9
48.0
43.8
37.7
32.8
30.9
25.7
20.6
11.0
4.9
3.0
-0.6
1.0
Weather Bin Data, Roanoke Va.
TOTAL HOURS* Cost to Heat
AT CONDITION
2
42
113
338
359
369
302
393
262
231
223
199
220
161
117
47
34
16
4
Condenser Air
Condenser Water
Supply Air
Reheat Credit
Heat Credit
$3
$123
$392
$1,302
$1,542
$1,777
$1,588
$2,239
$1,626
$1,547
$1,612
$1,556
$1,840
$1,437
$1,107
$472
$363
$181
$48
$3
$123
$392
$1,302
$1,542
$1,777
$1,588
$2,239
$1,626
$1,547
$1,524
$1,336
$1,407
$991
$679
$267
$192
$93
$22
$20,757
$18,653
2011 Munters Sales Meeting | Indoor Pool Dehumidification
$6.16
$129.34
$347.98
$1,040.87
$1,105.54
$1,136.34
$930.01
$962.44
$393.93
$113.21
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$0.00
$6,166
March 7, 2011
Dehum Coil Costs $9,882
Heating Costs $20,757
Cond. Air Credit $18,653
Cond. Water Credit $6,166
TOTAL $5,820
68% MORE
Fresh Air Pool Cost to Operate
$1,000.00
$800.00
$600.00
$400.00
/7
4.
87
2
.5
/7
2.
82
6
.5
/6
9.
77
2
.5
/6
5.
8
72
.5
/6
67
3
.5
/5
9.
62
2
.5
/5
4.
57
3
.5
/5
0.
52
2
.5
/4
5.
47
3
.5
/4
0.
42
9
.5
/3
7.
37
5
.5
/3
2.
32
7
.5
/2
8.
27
2
.5
/2
2.
22
7
.5
/1
8.
17
2
.5
/1
4.
3
12
.5
/1
0
7.
5
/6
.3
($200.00)
92
.5
/7
7
$0.00
97
.5
Cost
$200.00
($400.00)
($600.00)
($800.00)
($1,000.00)
($1,200.00)
Ambient Condition
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Comp Cost (W/Credits)
Reheat Cost
Heat Cost
MECHANICAL Cost to Operate
$2,500.00
$2,000.00
$1,500.00
$1,000.00
/7
4.
87
2
.5
/7
2.
82
6
.5
/6
9.
77
2
.5
/6
5.
8
72
.5
/6
67
3
.5
/5
9.
62
2
.5
/5
4.
57
3
.5
/5
0.
52
2
.5
/4
5.
47
3
.5
/4
0.
42
9
.5
/3
7.
37
5
.5
/3
2.
32
7
.5
/2
8.
27
2
.5
/2
2.
22
7
.5
/1
8.
17
2
.5
/1
4.
3
12
.5
/1
0
7.
5
/6
.3
($500.00)
92
.5
/7
7
$0.00
97
.5
Cost
$500.00
($1,000.00)
($1,500.00)
($2,000.00)
($2,500.00)
Ambient Condition
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Comp Cost (W/Credits)
Reheat Cost
Heat Cost
VT McComas Hall, 25,000 CFM
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Pool Unit Construction
● Structural Steel Base Frame
● All Welded Floor, Phenolic Coated
● Double Wall Construction, Aluminum Interior
● Fully welded Drain Pans, Rubberized Coating
● All aluminum Dampers
● Epoxy Coated Fan Assemblies
● Baked Phenolic Coated Coils
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
CONTROLS
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Refrigeration Capabilities
● Air Cooled – No Hot Gas Bypass
● Water Cooled
● Water Cooled heat pump
● R-22 /
R-407C /
R-410A
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Key Advantages
● Increased fresh air (12500 CFM) – Lower compressor run time (off 75% of the time)
● Higher capacity when cold out (most important during cold outside conditions)
● Better construction – Lower corrosion issues
● Compressors isolated from pool air
● More reliable with lower cost to operate
● Mfg. and service close
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Epoxy Coated Fan Assemblies
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Coated Coils
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Aluminum Heat Exchanger
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
All Aluminum Dampers
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Wiring Methods
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Base Frame
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Aluminum Tread Plate Floor
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Coated Floor
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Wringer Pool
● Wringer and Wringer Plus configurations
for pools
● Able to integrate building exhaust
● Larger Sizes, over 200 lbs/hr
● Humid markets
● Custom options, pool hot water heating,
controls
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
DryCool
● New Product, extends DryCool Systems
● Meant for small – midsize pools
● Standard Configurations
● Capacity Range 70 – 300 lbs/hr
● Price Range, base unit $ 25 – $ 65 K
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Fresh Air Pool
● Plate Heat Exchanger, with / without
refrigeration
● Western Markets
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Gas Fired Desiccants - Pools
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
90
85
85
PSYCHROMETRIC
CHART
85
W
ET
B
UL
B
TE
MP
ER
AT
UR
E
80
Normal Temperature
I-P Units
80
-°
F
80
SEA LEVEL
75
BAROMETRIC PRESSURE: 29.921 in. HG
75
95/78
75
86/60%
70
70
70
86/70
82/50%
60
80
%
90
93/74
65
65
%
60
86/50%
82/60%
65
55
60
55
%
70
60
45
50
40
10
15
20
25
30
40
%
30%
8% R
15%
MIDITY
TIVE HU
10% RELA
35
40
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
45
50
55
60
65
HU
TIVE
ELA
MID
ITY
35
30
25
20
6%
20%
25
20
15
40
30
20
10
%
25
35
25
45
%
40
30
15
50
45
35
50
%
DEW POINT TEMPERATURE - °F
55
50
70
75
4%
80
85
90
95
100
DRY BULB TEMPERATURE - °F
2011 Munters Sales Meeting | Indoor Pool Dehumidification
10
0
2%
March 7, 2011
105
110
115
120
Consider…
● Introduction of fresh air, in a controlled manner, will positively control indoor pool humidity when it
is most critical…WHEN IT IS COLD OUT, and building structures are coldest and most susceptible
for condensation formation.
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
TMY Data
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Design Parameters – USA POOL
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Conventional Dehumidifier
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Summary of Operating Costs
Conventional
Des Champs
Pool DehumidifierFAP Dehumidifier
Dehumidification Coil Costs
$51,095
$12,234
Air Heat Costs
$68,903
$20,376
Air Heat Credit (Condenser Heat Reclaim)
$60,873
N/A
Water Heat Credit (Condenser Heat Reclaim
$15,002
N/A
TOTAL COSTS
$44,123
Savings
$32,610
$11,513
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Fresh Air Pool Retrofit
● Hampton Inn Pool
– 700 L/s OA; 2 speed; VFD
– 1,900 L/s SA; Hybrid System
O/A
Micro-Z Unit
E/A
Pool Space
R/A
E/A
O/A
Condensing Unit
Recirc
Fan Coil Unit
S/A
Mixed Air
To FCU
DX Coil
2011 Munters Sales Meeting | Indoor Pool Dehumidification
Ind. Gas
Furnace
March 7, 2011
Pool
Fresh Air Case Study
● Marshall Pool (Vancouver)
–
–
–
–
–
Reduced Energy Costs
Winter Heat Recovery
Improved Occupant Comfort
Structural Integrity Protected
Reduced Maintenance Cost
Annual Total Costs (Air-to-Air HX only)
Air Heating ($)
Pool Water Heating ($)
Fan Energy ($)
Total ($)
Annual Total costs (Air-to-Air HX +Heat Pump)
5,559
22,242.56
5,847.31
33,826.30
Air Heating ($)
Pool Water Heating ($)
Fan Energy ($)
Total ($)
Savings ($)
Totals reflect miscellaneous power consumption, pumps, controls, etc.
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
2,003.80
7,592.82
5,931.48
15,705.54
18,120.76
Indoor Pools/Natatoriums
● Estimated 250,000 commercial indoor pools in continental U.S.
● Value is between $2 and $2.5 billion
● 70% of market is hotel/motel/apartment/condo (HMAC)
– Tend to be smaller pools – market similar to residential
● 30% of market is institutional (university and similar)
– Tend to be larger pools – typically would have a
construction/bid specification
● It is estimated that 50% of recreational indoor
pool facilities in North America are not
delivering IAQ that is considered healthy
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011
Indoor Pools/Natatoriums
● Physical fitness facilities are expected to continue to grow, even during recession ~4%
growth is expected in 2009
● Almost 50,000 facilities are in operation
● Newest opportunity is indoor aquatic parks
● New/planned aquatic facilities are feeling impact of economic crisis
– 132 open in U.S. and Canada – number of new projects expected to decline in 2009
– Projected opening of 13 indoor waterparks and 5 expansions of existing parks
– Approximately 300 proposals for new indoor waterpark resorts or indoor waterpark additions to
existing properties
● Regulations/standards are in the process of being defined for indoor aquatic facilities
2011 Munters Sales Meeting | Indoor Pool Dehumidification
March 7, 2011