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ClimateMaster Geothermal Heat Pump Systems

All Products Technical Guide: 2008

Ref er ence Calculations & Legend

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 -

GPM x 500

LAT = EAT +

CFM x1.08

LWT = EWT +

GPM x 500

LAT (DB) = EAT (DB) -

CFM x1.08

LC = TC - SC

S/T =

Heating

Cooling

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

RIGHT RETURN AIR

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.

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