Transcription of Commonly Used HVAC Formulae and Conversions
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Commonly Used HVAC Formulae and Conversions
Commonly used HVAC Formulae and Conversions Air Side QTotal = CFM x (hi hf) x Btuh QSensible = CFM x (ti tf) x Btuh QLatent = CFM x (Gri Grf) x .068 Btuh Humidification = CFM x (Grf Gri) / 1,555 lbs/hr CFM = l/s x Air Pressure Drop (in. wg) = Pa / 249 Water Side Q = USGPM x (ti tf) x 500 Btuh Q = USGPM x (ti tf) x 450 Btuh (50% ) Q = USGPM x (ti tf) / 24 Tons USGPM = l/s x Water Pressure Drop (ft. wg) = kPa x PSI = wg 7,000 Grains = lb Miscellaneous Ton = 12 MBH = 12,000 Btuh Therm = 100,000 Btuh = 100 MBH COP = / (kw / Ton) EER = Tons x 12 / (Total kW input) Btuh = Watt x HP = kW x 1 Boiler HP = MBH 1 US Gallon = Latent heat of vaporization of steam in air (average) = 1,050 Btuh/lb The Affinity Laws (Fan/Pump Laws) rpm2 Flow2 = rpm1 Flow1 P2 Flow2 2 = P1 Flow1 mhp2 Flow2 3 = mhp1 Flow1 Pump BHP = USGPM x Head (ft.)
Commonly Used HVAC Formulae and Conversions Air Side Q Total = CFM x (h i ‐ h f) x 4.5 Btuh Q Sensible
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