Ammonia Air Cooling Coils

Chilled water coils also known as hydronic cooling coils are typically used to cool or remove moisture from air streams. The air to be cooled moves through the fins, and either water or an ethylene or propylene glycol solution move through the tubes.A chilled water fan coil unit (FCU) works by transferring heat from the air passing over the internal heat exchanger to the chilled water passing within. Cold water is supplied by a chiller unit, or reversible heat pump, which is installed in a central plant room or on the roof of a building. Water Coil Construction. Coils are used to transfer heat between two mediums, often water and air. Air passes over a coil and the water passing through the coil either absorbing or giving up its heat. The greater the temperature differential between the air and water, the greater the potential heat transfer.