Heat recovery is the collection and re-use of heat arising from any process that would otherwise be lost. The process might be inherent to a building, such as space heating, ventilation and so on.

Ventilation systems bring cool fresh air into a building using fans in Air Handling Units (AHUs). The AHUs also contain heating coils to allow the fresh air to be raised to the required temperature by the buildings boiler. The air continues to be heated by the occupants and equipment in the room and all this heat energy is lost when the air is extracted into the environment.

The addition of heat recovery means that some of the heat contained within the extract air can be recovered. The heat energy is passed into the incoming fresh air effectively pre-heating it and meaning the boiler needs to add less heat. The two air streams need not mix directly to allow the transfer of heat.

Below is a diagram demonstrating how heat recovery works:

 Heat recovery diagram

Please contact Aria if you think that Heat Recovery could be of benefit in your home or place of work.

If you wish to know more about heat recovery then please take a look at this guide produced by the Carbon Trust: https://www.carbontrust.com/media/31715/ctg057_heat_recovery.pdf

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