About the Psychrometric Process Plot Helper Online Free Tool

The Psychrometric Process Plot Helper Online Free Tool compares two air states from dry-bulb temperature, relative humidity, and atmospheric pressure, then estimates humidity ratio and enthalpy changes.

How to Use the Psychrometric Process Plot Helper Online

1. Enter dry-bulb temperature and relative humidity for state 1 and state 2.
2. Enter atmospheric pressure for the psychrometric calculation.
3. Run the calculation to compare humidity ratio, enthalpy, sensible change, and latent change.
4. Use the results as numeric support for a psychrometric process sketch or chart review.

Choosing Options Correctly

Relative humidity:
Enter values from 0 to 100 percent for each state.

Pressure:
Use local atmospheric pressure when elevation materially affects air properties.

Common Use Cases

• Compare cooling and dehumidification states.
• Estimate sensible and latent components of an air-side process.
• Check psychrometric values before plotting them on a chart.

Quick FAQ

What does this helper compare?
It compares two air states and summarizes the psychrometric process between them.

Does it replace a full chart?
No. It helps with state-to-state checks; a full chart or HVAC software is better for complex systems.

Why can two states be invalid?
Dry-bulb, humidity, and pressure inputs must describe physically possible moist-air conditions.

What processes can it help review?
Heating, cooling, humidification, dehumidification, and mixed-air style checks.