Mechanical Concepts - HVAC Manufacture's Representative ...
BASIC HVAC FORMULAS
11/16/09
AIR SYSTEM
Q Sensible = 1.08 x CFM x (T
Q Latent = 4840 x CFM x (H
WATER SYSTEM
Q Total = 500 x GPM x (T
EQUIPMENT LOAD
Q Total = W x 3.412
Q Total = 2545 x (HP / motor eff.)
ENERGY
One Horsepower = 746 Watts
1 Watt = 3.413 Btu/hr
1 Boiler Horsepower = 33,472 Btuh
TEMPERATURE
F = C x 1.8 + 32
F = Kelvin x 1.8 – 459.7
CHILLER
kW/Ton = 12 / EER
kW/Ton = 12 / (COP x 3.412)
kW/Ton = 12 / (SEER x 0.697 + 2.0394)
EER = 12 / (kW/Ton)
EER = COP x 3.412
COP = EER / 3.412
COP = 12 / (kW/Ton) / 3.412
MISCELLANEOUS
1 psi = 2.31 ft H20
1 HP = 0.746 kW
1 atm = 14.7 psia
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