Reference Calculations And Legend - York YAFS012 Installation Manual

Reference Calculations
Heating Calculations:
HE
LWT = EWT -
gpm x 500
HC
LAT = EAT +
cfm x 1.08
TH = HC + HW
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
Cooling Calculations:
HR
LWT = EWT +
gpm x 500
SC
LAT (DB) = EAT (DB) -
cfm x 1.08
LC = TC - SC
SC
S/T =
TC
AFFINITY SINGLE & DUAL CAPACITY SERIES INSTALLATION MANUAL
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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