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Heat of Extraction/Rejection Data
Model
gpm
1.2
09
1.8
2.5
1.5
12
2.3
3.5
2.0
15
3.0
4.5
3.0
18
4.0
5.5
Data provided in MBtu/h
Reference Calculations
Heating Calculations:
HE
LWT = EWT -
gpm x 500
HC
LAT = EAT +
cfm x 1.08
TH = HC + HWC
Legend
ABBREVIATIONS AND DEFINITIONS:
cfm
= airflow, cubic feet/minute
EWT = entering water temperature, Fahrenheit
gpm = water flow in gallons/minute
WPD = water pressure drop, psi and feet of water
EAT
= entering air temperature, Fahrenheit
(dry bulb/wet bulb)
HC
= air heating capacity, MBtu/h
TC
= total cooling capacity, MBtu/h
SC
= sensible cooling capacity, MBtu/h
KW
= total power unit input, kilowatts
HR
= total heat of rejection, MBtu/h
Heat of Extraction (HE)
30°F
50°F
70°F
6.2
8.1
5.0
6.6
8.5
5.0
6.9
9.0
7.8
10.1
6.3
8.1
10.4
6.2
8.6
10.9
10.3
12.4
8.8
10.7
12.9
7.4
11.3
13.7
12.0
15.2
9.5
12.2
15.5
8.5
12.6
16.0
Cooling Calculations:
HR
LWT = EWT +
gpm x 500
LAT(DB) = EAT(DB) -
cfm x 1.08
LC = TC - SC
SC
S/T =
TC
AFFINITY LOW SILL SERIES INSTALLATION MANUAL
90°F
30°F
10.6
10.8
13.9
10.9
14.0
12.4
12.6
16.3
12.8
16.3
16.4
16.7
19.4
17.0
19.5
17.6
17.9
23.4
18.2
23.5
SC
HE
= total heat of extraction, MBtu/h
HWC = hot water generator capacity, MBtu/h
EER = Energy Efficient Ratio
= Btu output/Watt input
COP = Coefficient of Performance
= Btu output/Btu input
LWT = leaving water temperature, °F
LAT
= leaving air temperature, °F
TH
= total heating capacity, MBtu/h
LC
= latent cooling capacity, MBtu/h
S/T
= sensible to total cooling ratio
39
Heat of Rejection (HR)
50°F
70°F
90°F
12.9
12.1
11.8
13.1
12.4
11.7
13.4
12.6
11.8
15.2
14.4
13.9
15.4
14.6
13.9
15.8
14.9
14.0
19.7
18.2
19.9
19.8
18.2
20.0
19.9
18.2
20.2
23.8
22.0
20.7
23.9
21.9
20.7
23.9
21.9
20.9
110°F
10.9
11.0
12.9
13.0
18.7
18.9
19.4
19.5
6/10/13
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