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Reference Calculations
Heating Calculations:
HE
LWT = EWT -
gpm x 500
HC
LAT = EAT +
cfm x 1.08
TH = HC + HWC
Cooling Calculations:
HR
LWT = EWT +
gpm x 500
SC
LAT(DB) = EAT(DB) -
cfm x 1.08
LC = TC - SC
SC
S/T =
TC
LX COMPACT SERIES INSTALLATION MANUAL
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
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
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