Psychrometric Inputs
Unit System
Input Combination
Optional. Leave at 101.325 kPa (or 29.92 inHg) for standard atmosphere.
Uses standard psychrometric relationships with a Tetens-type saturation pressure approximation. Intended for field checks and diagnostics, not as a substitute for project-specific design software.
Calculated Properties
All per kilogram or pound of dry air as noted.Relative Humidity
–
%
Dew Point
–
°C
Wet-Bulb (approx.)
–
°C
Humidity Ratio
–
kg water / kg dry air
Moisture Content
–
g water / kg dry air
Enthalpy
–
kJ / kg dry air
Specific Volume
–
m³ / kg dry air
Specific Volume (IP)
–
ft³ / lb dry air
Quick Interpretation
Run a calculation to see a brief interpretation of the condition – comfort band, dehumidification required, or risk of condensation.
Psychrometrics in the Field
Psychrometric data is the foundation of almost every HVAC diagnostic. This tool provides fast field-level values—humidity ratio, dew point, wet-bulb temperature, enthalpy, and specific volume—without needing a chart or app.
Moisture Load
Identify whether the space requires dehumidification, humidification, or adjustments to OA mixtures.
Cooling Coil Performance
Compare entering/leaving air conditions, evaluate approach temperatures, and verify sensible/latent behavior.
Outdoor Air Evaluation
Understand how outside conditions affect pressurization, mixed air temperature, and equipment capacity.
Ventilation Troubleshooting
Confirm if high supply humidity, elevated dew points, or poor latent removal are contributing to comfort or condensation issues.
TAB Verification
Validate sensor readings, check mixed-air calculations, and confirm that measured airflow and temperature data align with expected thermodynamic behavior.
Explore other tools
Quick links to our other simulators and references.