Heat Recovery Efficiency Calculator

Model the supply-air temperature a plate or wheel delivers before the coils see the air. This tool helps visualize the direct energy gap reduced by your selected recovery technology.

Governing Formula

$$T_{\text{supply}} = T_{\text{outdoor}} + \eta \times (T_{\text{exhaust}} – T_{\text{outdoor}})$$

Technical Note: Sensible temperature model only; a wheel also recovers latent (moisture) energy. Field effectiveness is lower than rated due to fouling, frost and pressure imbalance — Koven sizes on the post-recovery design condition.

Outdoor air temp (°C)

winter example: −5

Exhaust / return air temp (°C)

typical indoor: 20–24

Recovery effectiveness η

plate 0.50–0.80 · wheel 0.80–0.90

Setpoint temp (°C)

supply setpoint

Supply air after recovery — °C

Coil lift with recovery — °C

Coil lift without recovery — °C

Temp load avoided — °C (—% gap)