An enthalpy exchanger, known as an energy recovery ventilator (ERV), is a device used to recover the heat or energy from the exhaust air of a building and transfer it to the incoming fresh air. 

The primary function of an enthalpy exchanger is to improve the energy efficiency of a building's ventilation system. It helps to reduce the heating or cooling load by using the energy from the outgoing air to precondition the incoming air, thereby reducing the overall energy consumption for conditioning the fresh air.

Enthalpy exchangers are particularly useful in climates where there are significant temperature and humidity differences between the indoor and outdoor environments. Apart from transferring sensible heat (temperature), they also transfer latent heat (moisture) between the airstreams, providing the benefits of both heat and moisture recovery.

The basic working principle involves the use of parallel air streams that pass through an enthalpy exchanger core. The core usually consists of plates or a matrix that allows heat and moisture to transfer between the two airstreams without mixing them. The outgoing air gives up its heat and moisture to the enthalpy exchanger, while the incoming air absorbs the recovered energy before being supplied to the building.

Overall, enthalpy exchangers play a crucial role in improving indoor air quality, reducing energy consumption, and maintaining a comfortable and healthy environment in buildings.

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