HVAC Psychrometric Calculator
Calculate air properties including humidity ratio, dew point, wet bulb temperature, enthalpy and more for HVAC design and troubleshooting.
Created by Sam Ruf
Input Parameters
Enter any two known properties to calculate the others.
Results
Your calculation results will appear here.
Air Mixing Calculator
Calculate properties of mixed airstreams (e.g., return air + outside air).
Airstream 1 (e.g., Return Air)
Airstream 2 (e.g., Outside Air)
Mixed Air Results
Results of mixed airstreams will appear here.
Cooling & Heating Process
Calculate air properties after cooling, heating, or dehumidification processes.
Initial Air Conditions
Process Results
Results of air process will appear here.
About Psychrometric Calculations
The psychrometric calculator helps HVAC professionals analyze air properties for system design and troubleshooting. Key terms:
- Dry Bulb Temperature: The temperature measured by a standard thermometer.
- Wet Bulb Temperature: The temperature measured by a thermometer with a wet wick, affected by humidity and air movement.
- Dew Point Temperature: The temperature at which air becomes saturated and condensation begins.
- Relative Humidity (RH): The ratio of actual water vapor in the air to the maximum amount possible at that temperature.
- Humidity Ratio: The mass of water vapor per mass of dry air (grains/lb or g/kg).
- Enthalpy: The total heat content of air, including sensible and latent heat (BTU/lb or kJ/kg).
- Specific Volume: Volume occupied by a unit mass of air (ft³/lb or m³/kg).
These calculations are essential for designing HVAC systems, analyzing cooling and heating processes, and ensuring proper indoor air quality and comfort.
Important Note
This calculator provides accurate psychrometric calculations based on standard formulas and ASHRAE data. Results are intended for professional reference. For critical applications, always verify calculations with multiple sources or consult with a qualified HVAC engineer.