Find a State Point

Locate the intersection of dry-bulb (x-axis) and the diagonal humidity lines. That point gives wet-bulb, humidity ratio, and enthalpy at once.

Trace a Recovery Process

• Mark the exhaust state and the supply state
• For a sensible device, move horizontally (temperature changes, moisture stays)
• For an enthalpy device, move along a line that also drops humidity ratio

Read the Result

The enthalpy difference between states is the recovered energy per kg of air. Multiply by mass flow to get power.

Use It For Selection

The chart shows whether a sensible or enthalpy device meets your supply-air target, which settles the technology choice.