Air Properties Calculator – Psychrometric Calculator for HVAC Engineers
The Air Properties Calculator (also known as a Psychrometric Calculator) is an essential HVAC engineering tool used to calculate thermodynamic properties of moist air. This online calculator helps engineers, technicians, and students quickly determine humidity ratio, relative humidity, enthalpy, dew point temperature, degree of saturation, and specific volume.
Table of Contents
What is an Air Properties Calculator?
An Air Properties Calculator uses psychrometric equations to determine the physical and thermal properties of moist air at a given condition. It is widely used in HVAC design, cooling load calculations, AHU selection, duct design, and indoor air quality analysis.
Input Parameters
- Atmospheric Pressure (kPa)
- Dry Bulb Temperature (°C)
- Wet Bulb Temperature (°C)
⚠️ Note: Wet bulb temperature must always be less than or equal to dry bulb temperature.
Air Properties Calculator
Vapour Pressure:
Specific Humidity:
Relative Humidity:
Degree of Saturation:
Enthalpy:
Specific Volume:
Dew Point Temperature:
Calculated Air Properties
- Vapour Pressure
- Specific Humidity (Humidity Ratio)
- Relative Humidity
- Degree of Saturation
- Enthalpy of Moist Air
- Specific Volume
- Dew Point Temperature
HVAC Applications
- Cooling & heating load calculations
- AHU & FCU selection
- Psychrometric chart analysis
- Indoor air quality studies
- HVAC commissioning & troubleshooting
Frequently Asked Questions (FAQ)
Is this air properties calculator accurate?
Yes. This calculator uses standard ASHRAE psychrometric equations and is suitable for HVAC engineering calculations.
Can I use this calculator on mobile?
Yes. This tool is fully responsive and works on Android and iOS devices.
Why wet bulb temperature must be less than dry bulb?
Because wet bulb temperature represents evaporative cooling. It cannot physically exceed dry bulb temperature.
Is this calculator free?
Yes. This online psychrometric calculator is completely free to use.
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