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| Carry over leakages in rotary heat exchangers
10 Carry over leakages in rotary heat exchangers
Air from extract air can be carried over to supply air by the exchanger’s rotation.
OACF – Outdoor Air Correction Factor: Ratio of outdoor air mass flow divided by the supply air mass flow.
EATR – Exhaust Air Transfer Ratio: Percentage of the extract air going back to the supply air.
Fig. 17
10.1 Purge sector
The figure 18 describes how the purge sector change the direction of the outdoor air to exhaust air and by that rinses
the exchanger from remaining of extract air in the rotor material. The angle of the purge sector is installed from factory
in 0°.
Two purge sectors are built in the rotary wheel housing one on each side of the rotor as a preparation for both left and
right units. If the angle needs to be changed it is the purge sector on the supply air side.
Fig. 18 Image of right handed exchanger
1 2 3 4 5 6
Exhaust air
Extract air
Outdoor air Supply air Direction of rotation of the rotor
Purge sector
254050 | A001
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