The calculations follow ASHRAE Handbook – Fundamentals. va_T_RH (T,RH) – Calculates specific volume of a air water mixture (ft3/lb) at a specified temperature (T, degF) and relative humidity (RH).vsa_T (T) – Calculates specific volume of saturated air (ft3/lb) at a specified temperature (T, degF).vda_T (T) – Calculates specific volume of dry air (ft3/lb) at a specified temperature (T, degF).
Tda (h) – Calculates a specific temperature for dry air of a specific enthalpy. ha_T_RH (T,RH) – Calculates specific enthalpy of a air water mixture (BTU/lb) at a specified temperature (T, degF) and relative humidity (RH). hsa_T (T) – Calculates specific enthalpy of saturated air (BTU/lb) at a specified temperature (T, degF). 
hda_T (T) – Calculates specific enthalpy of dry air (BTU/lb) at a specified temperature (T, degF). Interpolate (x, x1, x2, y1, y2) – Calculates y (unknown) given x and four known table lookup values (x1, x2, y1, y2) using a linear interpolation. hfg_T (T) – Calculates the specific enthalpy of evaporation at a given temperature (T, degF). Pvap_TDB_RH (TDB, RH, P) – Calculates the vapor pressure of water (Pvap, psia) in air for a given dry bulb temperature (TDB, degF), RH (%) and total pressure (P, psia) as inputs. Psat_T (T) – Calculates the saturation pressure (Psat, psia) of water vapor for a given temperature (Tsat, F). Tsat_P (P) – Calculates the saturation temperature (Tsat, F) of water vapor for a given pressure (Psat, PSIA). Wsat_T (T) – Calculates the saturation humidity ratio (w, lbw/lbda) for a given temperature (Tsat, F). T_Wsat (Wsat) – Calculates the temperature (Tsat, F) corresponding to a given saturation humidity ratio (w, lbw/lbda). W_TDB_TWB (TDB, TWB, P) – Calculates humidity ratio (w, lbw/lbda) for known dry-bulb temperature (TDB, F) and wet-bulb (TWB, F) at a given pressure (P, psia). 
TDP_TDB_RH (TDB, RH, P) – Calculates dew-point temperature (TDP, F) for a known dry-bulb temperature (TDB, F) and relative humidity (RH, %) at a given pressure (psia). TWB_TDB_RH (TDB, RH, P) – Calculates wet-bulb temperature (TWB, F) for a known dry-bulb (TDB, F) and relative humidity (RH, %) at a given pressure (P, psia). TDB_RH_W (RH, W, P) – Calculates drybulb (TDB, F) for a known relative humidity (RH, %) and humidity ratio (W, lbw/lbda) at a given pressure (P, PSIA). RH_TDB_W (TDB, W, P) – Calculates relative humidity (RH, %) for a known drybulb (TDB, F) and humidity ratio (W, lbw/lbda) at a given pressure (P, PSIA). RH_TDB_TWB (TDB, TWB, P) – Calculates relative humidity (RH, %) for a known dry-bulb (TDB, F) and wet-bulb (TWB, F) temperature at a given pressure (P, PSIA). Currently the following calculations are supported with Excel(TM) friendly functions: Absolute humidity ratio calculator free#
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