Learning workbench

A hands-on guide to psychrometrics

Air changes.
Follow the water.

Start with one air state. Heat it, cool it, or remove moisture—and see why relative humidity never tells the whole story.

01—04

Four experiments.
No weather account.
No facility setup.

Choose a lesson ↓

01 / Set the air

Your starting state

Three inputs are enough: dry bulb, one humidity measure, and station pressure.

Declare the humidity convention

Below freezing, water and ice give different answers. An unknown required convention cannot be calculated.

02 / Read the state

Temperature × water

Air-state calculator

Right means warmer. Up means more water per unit of dry air. Curved lines show RH over liquid water.

● A · Input   ■ B · After process   ◆ C · Room reference

Calculated air states; each row uses its own station pressure. Secondary values show the other unit system.
StateDry bulbRHWater / dry airEnthalpyPressure

03 / Try a process

Predict. Change. Explain.

Choose a lesson to load its starting air.

Use arrow keys to change the process. You can also edit the starting air above.

04 / Use real weather

Take a real hour apart

These saved reanalysis examples load locally. No weather-provider request is made.

CSV: time (UTC ending Z), tempC, rh (0–1) or dewPointC, pressurePa, ghiWm2. JSON: schema-1/2 weather snapshot or exported run. Existing JSON conventions remain attached to each hour.