500 Chilled Water Cooling Coil is a type of heat exchanger used in air conditioning systems to cool and dehumidify the air. It is typically made of copper or aluminum tubing that is wrapped around a series of fins, which increase the surface area of the coil and help to transfer heat more efficiently. Chilled water is circulated through the tubing, absorbing heat from the air as it passes over the fins. The cooled and dehumidified air is then circulated back into the building.