PSYCHROA THERMODYNAMIC PROPERTIES TOOL
SEA LEVEL · 14.696 psi

AIR-SIDE HVAC CALCULATOR

Mixed air, made clear.

Enter dry-bulb, wet-bulb, and airflow for two streams to see the resulting condition instantly.

A
AIR STREAM
DERIVED RH43.2%HUMIDITY RATIO97.3 gr/lbENTHALPY37.4 Btu/lb
+
B
AIR STREAM
DERIVED RH51.6%HUMIDITY RATIO66.7 gr/lbENTHALPY28.4 Btu/lb
MIXING RATIO

Adjust the outdoor-air fraction

Outdoor air 20%Return air 80%

Moving the slider preserves the total airflow and redistributes CFM between the two streams.

A92.0°F400 CFM
B75.0°F1,600 CFM
MIX
M78.4°F2,000 CFM
How it works

Humidity ratio and enthalpy are airflow-weighted, then the mixed dry-bulb and relative humidity are solved from those conserved properties. This is the standard HVAC volumetric-airflow approximation at sea-level pressure.