Live Engineering Tools

HVAC Engineering Calculators

Real psychrometric calculations in your browser. Engineered for accuracy — indicative results that engineers can actually use.

HEX Type

Flow Arrangement

HEX Medium

Sensible ε

76.2 %

Latent ε

72.4 %

Effectiveness calculated via NTU-ε method. Actual values depend on HEX size and face velocity.

Airflow & External Static

OA Flow Rate (L/s)

Ext. Static (Pa)

Summer Outside Air

Dry Bulb (°C)

Wet Bulb (°C)

Winter OA & Room Conditions

Winter OA DB (°C)

Room DB (°C)

Room WB (°C)

Select HEX type, enter conditions and click Calculate. Effectiveness is derived automatically from the NTU-ε method.

Indicative calculations only. Full product selections include verified model data, certifications and technical documentation.