HVAC Formulas have some useful equations
-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 -
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