Psychrometric Calculator

Humid air properties: dry bulb, wet bulb, dew point, humidity ratio, enthalpy

Presets

Calculation Type

Input Parameters

Dry Bulb Temperature (°C)

Relative Humidity (%)

Atmospheric Pressure (kPa)

Sea level: 101.3 kPa • 500 m: ~95.5 • 1000 m: ~89.9 • 2000 m: ~79.5

Sensible Heating/Cooling

Horizontal line on chart. Humidity ratio W constant, dry bulb T changes.

Humidification

Vertical line on chart. Dry bulb T constant, humidity ratio W increases.

Adiabatic Saturation

Along constant wet bulb line. Enthalpy h approximately constant.

Dehumidification

Cool below dew point then reheat; removes condensate, lowers W.

Psychrometric Properties

Dry Bulb

25.0°C

Wet Bulb

17.8°C

Dew Point

13.9°C

50.0%

Humidity Ratio:0.009876 kg/kg

Enthalpy:50.3090 kJ/kg

Vapor Pressure:1,583.71 Pa

Sat. Vapor Pressure:3,167.43 Pa

Specific Volume:8.5821e-4 m³/kg

ASHRAE 55 Comfort

✓ Within comfort zone