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Geothermal Comfort Systems
Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05
17
CFM = airfl 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 Effi ciency Ratio
= BTU output/Watt input
COP = Coeffi 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