Dry-Bulb from Enthalpy and Humidity Ratio
The inverse of the moist-air-enthalpy tile: the dry-bulb temperature of an air state from its enthalpy and humidity ratio - t = (h - 1061 W) / (0.240 + 0.444 W) deg F. An enthalpy of 31.48 Btu/lb at W 0.0112 recovers an 80 F dry-bulb. Use it to back out the dry-bulb of a coil's entering or leaving state when a psychrometric analysis gives the enthalpy and W but not the temperature. Sea-level ASHRAE coefficients; a design aid, not a substitute for a measured chart state.
Formula and source
t = (h - 1061 W) / (0.240 + 0.444 W) deg F (the moist-air enthalpy h = 0.240 t + W (1061 + 0.444 t) solved for t).
The I-P moist-air enthalpy relation from the ASHRAE Handbook - Fundamentals solved for the dry-bulb, the inverse of the moist-air-enthalpy tile, by name.
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