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Indoor & Outdoor Split
Geothermal Comfort Systems
Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05
17
CFM = air
fl
ow, cubic feet/minute
EWT = entering
water
temperature,
˚
F
GPM = water
fl
ow in US gallons/minute
EAT = entering air temperature, Fahrenheit
(dry
bulb/wet
bulb)
HC
=
air
heating
capacity,
Mbtuh
TC = total cooling capacity, Mbtuh
SC = sensible cooling capacity, Mbtuh
KW = total power unit input, KiloWatts
HR = total heat of rejection, Mbtuh
HE = total heat of extraction, Mbtuh
HWC = Hot Water Generator (desuperheater)
capacity,
Mbtuh
WPD = Water coil pressure drop (psi & ft hd)
EER = Energy
Ef
fi
ciency Ratio
= BTU output/Watt input
COP = Coef
fi
cient of Performance
= BTU output/BTU input
LWT = leaving
water
temperature,
°F
LAT = leaving air temperature, °F
LC = latent cooling capacity, Mbtuh
S/T = sensible to total cooling ratio
LWT = EWT -
HE
GPM x 500
LAT = EAT +
HC
CFM x1.08
LWT = EWT +
HR
GPM x 500
LAT (DB) = EAT (DB) -
SC
CFM x1.08
LC = TC - SC
S/T =
SC
TC
Heating
Cooling
Heating Corrections
Cooling Corrections
Sens Clg Cap Multiplier - Entering DB
°
F
Ent Air DB
°
F
Htg Cap
Power
Heat of
Ext
Ent Air
WB
°
F
Total Clg
Cap
70
75
80
80.6
85
90
95
Power
Heat of
Rej
60
1.019
0.896
1.054
60
0.881
0.943
1.067
1.192
1.240
*
*
*
0.983
0.899
65
1.010
0.948
1.028
65
0.940
0.797
0.952
1.106
1.125
1.261
*
*
0.991
0.949
68
1.004
0.980
1.011
66.2
0.976
0.693
0.868
1.043
1.063
1.217
*
*
0.997
0.980
70
1.000
1.000
1.000
67
1.000
0.624
0.812
1.000
1.023
1.188
1.343
1.352
1.000
1.000
75
0.997
1.059
0.979
70
1.012
0.697
0.820
0.835
0.944
1.067
1.257
1.002
1.010
80
0.993
1.118
0.957
75
1.024
0.637
0.658
0.817
0.983
1.159
1.005
1.019
Rev. 5/2/00M
*
Sensible capacity equals total capacity (no latent capacity) at conditions shown as "
*
"
ARI/ISO/ASHRAE 13256-1 uses entering air conditions of Clg- 80.6
°
F DB/66.2
°
F WB and Htg- 68
°
F DB/59
°
F WB
GT-GS & GT-S Performance Correction Factors