DX coil means cooling the air by loading the heat taken from the air passing through the evaporator to refrigerant with the help of compressor. To simply describe the system, a direct expansion cooling coil is adapted to an air handling unit and exterior ountdoor unit which is connected to this coil to the extent it requires. While performing this operation, the refrigerant is evaporated at the source (AHU) where the heat transfer is made. During the heat transfer made by conventional cooling groups (chiller / hot water boiler), heat first transferred to water and then the heat transfer made inside the AHU via pipes and pumps. AHU with DX coil heat pump operation make air conditioning without any need of conventional cooling groups and hot water boilers.

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Air Handling Units, Air  Handling Unit.