Moist Air Enthalpy (ASHRAE Psychrometrics)
Total heat content h = 0.240 t + W (1061 + 0.444 t) Btu per lb dry air, the state property every coil and air-mix calculation starts from. Return air at 80 F, W 0.0112 -> 31.48 Btu/lb; 55 F supply, W 0.009 -> 22.97. Pair with outdoor-air-mix for W. A design aid; the chart and equipment ratings govern.
Formula and source
h = 0.240 t + W (1061 + 0.444 t) Btu per lb dry air.
The I-P moist-air enthalpy relation from the ASHRAE Handbook - Fundamentals, by name.
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