Views: 0 Author: Site Editor Publish Time: 2023-07-20 Origin: Site
A DX (Direct Expansion) coil is an evaporator coil commonly used in air handling units (AHUs) for cooling and dehumidification.
A DX coil is a refrigerant-air heat exchanger designed to remove heat from the air flowing through an AHU. It consists of a series of tubes through which the refrigerant flows and a series of fins that increase the surface area of the tubes, allowing more heat to be transferred to the refrigerant. As the air passes over the fins, it transfers heat to the refrigerant and is cooled.
The refrigerant used in a DX coil is typically a liquid that evaporates at low temperatures, such as R-410A or R-134a. The refrigerant is circulated through the coil by a compressor, which compresses the refrigerant and pumps it through the coil. As the refrigerant flows through the coil, it absorbs heat from the air flowing through the fins, causing it to evaporate and turn into a gas.
The cooled and dehumidified air is then supplied to the building through AHU's ductwork. DX coils are typically located downstream of the supply fan and upstream of any filters or other air handling components in the AHU.
Overall, the DX coil is an efficient and effective method of cooling and dehumidifying the air in an AHU. It provides precise temperature control and can handle a variety of cooling loads. However, it does require regular maintenance, such as cleaning and replacing filters, to ensure optimal performance.
