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USEFUL HVAC FORMULAS

      * Total Heat (BTU/hr) = 4.5 x cfm x ?h (std.air)
      * Sensible Heat (BTU/hr) = 1.1 x cfm x ?t
      * Latent Heat (BTU/hr) = 0.69 x cfm x ?gr. (std. air)
      * Total Heat (BTU/hr) = 500 x gpm x ?t (water)
      * TONS = 24 x gpm x ?t (water)
      * GPM cooler = (24 x TONS) / ?t (water)
      * Fluid Mixture Tm = (Xt1 + Yt2) / X + Y (this works for air or water)

      * BTU/hr = 3.413 x watts = HP x 2546 = Kg Cal x 3.97
      * Lb. = 453.6 grams = 7000 grains
      * psi = ft. water/2.31 = in. hg/2.03 = in. water/27.7 = 0.145 x kPa
      * Ton = 12,000 BTU/hr = 0.2843 x KW
      * HP (air) = cfm x ?p (in.H2O)/6350 x Eff.
      * HP (water) = gpm x ?p (ft.)/3960 x Eff.
      * Gal. = FT3/7.48 = 3.785 Liters = 8.33 lb. (water) = 231 in. 3
      * gpm = 15.85 x L/S

      * cfm = 2.119 x L/S
      * Liter = 3.785 x gal = 0.946 x quart = 28.32 x ft3
      * Therm = 100,000 BTU = MJ/105.5
      * Watt/sq. ft. = 0.0926 x W/M2
      * yd. = 1.094 x M
      * ft. = 3.281 x M
      * ft2 = 10.76 x M2
      * ft3 = 35.31 x M3
      * ft/min = 196.9 x M/S
      * PPM (by mass) = mg/kg

NOTE: Liter/sec is the proper SI term for liquid flow. M3/sec is the prop er SI term for airflow. Due to the awkward nature of using M3/S at low air flow rates (lots of decimal points), L/S is commonly used to express air flow for HVAC applications.