Psychrometrics · ASHRAE
What's the air actually carrying?
Enter a dry-bulb temperature and one of relative humidity, wet-bulb, or dew point, and get the full moist-air state: humidity ratio, enthalpy, dew point, specific volume. The ASHRAE psychrometrics behind cooling towers, dryers, and combustion air.
Air state
Site pressure
Air pressure drops with altitude, about −11% at 1000 m, which shifts every property. Enter altitude to set the pressure, or type it directly.
Moist-air properties
Relative humidity
–
of saturation at this temp
Humidity ratio
–
water per dry air
Enthalpy
–
energy per kg dry air
Wet-bulb temp–
Dew point–
Specific volume–
Moist-air density–
Vapor pressure–
Sat. vapor pressure–
A mini psychrometric chart: the curve is 100% saturation; your air sits at the dot.
Built by Empira
This free tool comes from our operator training simulators. Each is a working model of your own unit that operators run, break and recover.
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