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Air handling systems are typically used to recover heat from warm air leaving a facility and using that heat to heat incoming air. In cases where building requirements restrict any cross leakages between incoming air and air leaving the facility (for example hospitals) a double coil system is used to separate the air. By example: In a winter arrangement, where air has to be heated in a building, the air exiting the building is blown over a coil and heat is absorbed by a liquid such as water or a glycol mix. This liquid is pumped to another coil in the incoming air stream where a second coil heats the incoming air.
The arrangement is intended to achieve a physical separation of air streams, while providing a heat coupling between them, and ensuring that this is achieved even in cases where equipment develops leakages.
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