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| Known 1 | Known 2 | Solve for → | Method | |---------|---------|-------------|--------| | T_db, RH | All others | Direct | | T_db, W | RH | Inverse via ( p_w = (W \cdot P)/(0.62198+W) ) then RH = 100*p_w/p_ws | | T_db, T_wb | W, RH, h, v | Iterative (solve Carrier equation) | | T_db, h | W, RH, T_wb | Quadratic from enthalpy equation | | T_dp, T_db | RH, W | RH = p_ws(T_dp)/p_ws(T_db) *100 |
[ v = \frac0.2871 \cdot (T_db + 273.15)P \cdot (1 + 1.6078 \cdot W) ] where 0.2871 = gas constant for dry air (kJ/kg·K), ( P ) in kPa. psychrometric chart calculator excel
– solved iteratively from ( p_ws(T_dp) = p_w ). | Known 1 | Known 2 | Solve