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Bryant Geothermal Heat Pump Systems
GT-PG
9
Residential Products Technical Guide
Ref er ence Calculations & Legend
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
Piping End
Left Return Air Right Return Air
UPFLOW
Left Return Air
Side Discharge
Piping End
Right Return Air
Side Discharge
Piping End
Right Return Air
Back Discharge
Piping End
Left Return Air
Back Discharge
Piping End
LEFT RETURN AIR
Piping End
Piping End
RIGHT RETURN AIR
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
Hot Water Generator capacities (HWC) are based on potable water fl ow rate of 0.4 gpm per nominal equipment ton and 90°F
entering potable water temperature.