MurphkitschTHE ODDLY USEFUL TOOL LAB
한국어
Home / Math & science

Psychrometric Calculator

Engineering approximation for ideal moist air using Tetens vapor pressure over liquid water. Enthalpy reference is dry air and liquid water at0°C; limited to0–50°C.

Engineering approximation for ideal moist air using Tetens vapor pressure over liquid water. Enthalpy reference is dry air and liquid water at0°C; limited to0–50°C.

Your workbenchInputs are not stored

Result

Enter your values and run the tool to see your result.

How to use this tool

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Calculation method

Water-vapor partial pressurerh/100*0.6108*exp(17.27*temperature/(temperature+237.3))
Humidity ratio on dry-air basis(0.621945*(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3)))/(pressure-(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3)))))
Moist-air specific enthalpy1.006*temperature+(0.621945*(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3)))/(pressure-(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3)))))*(2501+1.86*temperature)
Specific volume per dry-air mass0.287042*(temperature+273.15)*(1+1.607858*(0.621945*(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3)))/(pressure-(rh/100*0.6108*exp(17.27*temperature/(temperature+237.3))))))/pressure

References