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TONS = Air Conditioning Load (Tons) GPMEVAP. = Evaporator Water Flow Rate (Gallons per Minute) GPMCOND. = Condenser Water Flow Rate (Gallons per Minute) 5.04 Air Change Rate Equations = CFM = AC/HR. = Air Change Rate per Hour CFM = Air Flow Rate (Cubic Feet per Minute) VOLUME = Space Volume (Cubic Feet) 5.05 Mixed Air Temperature T MA = T ROOM ...
The Sensible Heat Formula: Q = C x M x ∆𝑇 Q= quantity of sensible heat in BTU/hr M= mass C= specific heat of material ∆𝑇= temp difference Applied to Standard Air Applied to Water (not glycol)
Specific Heat Ratio of air at temperatures ranging -40 - 1000 degC (-40 - 1500 degF) at standard atmospheric pressure - Imperial and SI Units.
Sensible heat load and required air volume to keep the temperature constant at various temperature differences between make up air and room air: Sensible Heat Load and Required Air Volume Chart (pdf) . Latent Heat. Latent heat due to the moisture in air can be calculated in SI-units as: h l = ρ h we q dw kg (2) . where . h l = latent heat (kW) .
Latent Heat: LH = 3.0 Q∆w. where heat is in W = ∆t temperature difference, K or °C = ∆h enthalpy difference, kJ/kg ∆w = moisture concentration, g/kg dry air = Q flow rate of air, L/s. Pump or Fan Power. P = Q h.
HVACR FORMULAS. TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) of ice at 32°F 288,000 BTU/24 hr. 12,000 BTU/hr. APPROXIMATELY 2 inches Hg. (mercury) = 1 psi.
Excess Air = 50% 15 ft.3 of air to burn 1 ft.3 of methane produces: 16 ft.3 of flue gases: 1 ft.3 of oxygen 12 ft.3 of nitrogen 1 ft.3 of carbon dioxide 2 ft.3 of water vapor Another 15 ft.3 of air is added at the draft hood GAS PIPING (Sizing – CF/hr.) = Input BTU’s Heating Value Example: ___ 80,000 Input BTU’s_____
