WaterFurnace Versatec Base - Manual (Page 47)

47
VERSATEC BASE SERIES INSTALLATION MANUAL
Reference Calculations
Heating Calculations: Cooling Calculations:
LWT = EWT +
LAT(DB) = EAT(DB) -
LC = TC - SC
S/T =
HR
gpm x 500
SC
cfm x 1.08
SC
TC
HE
gpm x 500
LWT = EWT -
LAT = EAT +
TH = HC + HWC
HC
cfm x 1.08
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