Temperature- and humidity efficiency

Temperature- and humidity efficiency1

Temperature efficiency and humidiy efficiency values are the primary criteria for evaluating the performance of rotary heat exchangers. They are defined as the ratio between the air condition change achievable by the rotary heat exchanger and the maximum possible condition change of the air.

Definition according to VDI 2071

Temperature efficiency Φ

Temperature efficiency F1

Outgoing air Φ1 =

Temperature efficiency F2

Outdoor air Φ2 =

Humidity efficieny Ψ

Outgoing air ?1 =

Outgoing air Ψ1 =

Outdoor air ?2 =

Outdoor air Ψ2 =

t     = Temperature in °C
x    = Absolute specific humidity in g/kg
11    = Outgoing air condition before entering the rotorsystem
12    = Outgoing air condition after leaving the rotorsystem
21    = Outdoor air condition before entering the rotorsystem
22    = Outdoor air condition after leaving the rotorsystem