Heat exchanger functioning

Heat exchanger functioning, air-to-air heat transfer

Heat exchangers work through the transfer of energy in the form of heat from one medium (air, gas or fluid) to another. The functioning of heat exchangers, which bring about a complete separation of the two substances where there is no intermediate storage of heat, is known as a recuperator. Recair develops and produces recuperators for air-to-air heat transfer.

Heat exchanger functioning with maximum efficiency

In order to maximise the functioning of the heat transfer of heat exchangers, the partition in the exchanger has been designed in such a way that the distance the heat flow has to bridge is as small as possible. The permitted pressure drop in the exchanger has been taken into account.

The two air flows move (in opposite directions) parallel to one another along the -in principle immeasurably large- partition. This enables the cold air flow to be heated up to the temperature of the flowing out hot air flow and vice versa: the hot air flow can be cooled down up to the temperature of the flowing out cool air flow.

For an equal division of air flows over the width of the exchanger, triangular channels have been formed in the wall, with a minor diameter and an equal resistance. This is why the air flow is exactly equal in all channels. Each triangular channel is surrounded by three uniform channels in which counter flow occurs. This way, an extremely high effectiveness of 93% is reached in the exchanger. Because this results in an almost indistinguishable difference in temperature between incoming outside and outgoing inside air, this results in an extremely comfortable living and working atmosphere.

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