HVAC Toolkit

Psychrometric Chart Calculator

Calculate air properties and visualize psychrometric processes

Input Parameters

kPa

Standard: 101.325 kPa at sea level

°C
%

Process Calculator

Air Properties

Dry Bulb
-
Wet Bulb
-
Dew Point
-
Relative Humidity
-
Humidity Ratio
-
Enthalpy
-
Specific Volume
-
Density
-

Psychrometric Chart

RH Lines
Wet Bulb Lines
Enthalpy Lines
Current Point

ASHRAE Comfort Zone Reference

Summer (Cooling Season)

  • Temperature: 23.0 - 26.0°C (73 - 79°F)
  • Humidity: 30 - 60% RH
  • Max Humidity Ratio: 12 g/kg
  • Air Velocity: 0.15 - 0.25 m/s

Winter (Heating Season)

  • Temperature: 20.0 - 24.0°C (68 - 75°F)
  • Humidity: 30 - 50% RH
  • Min Humidity Ratio: 4 g/kg (comfort)
  • Air Velocity: 0.10 - 0.15 m/s

Reference: ASHRAE Standard 55-2020