DriExpress also provides its customers with DX Chillers. DX is short for Direct Expansion which means that the refrigerant expands (produces the cooling effect) in a coil that is in direct contact with the conditioned air that will be delivered to the space. Typical examples are residential air conditioners, both central and window units. These units are usually air cooled and self-contained. Units have the condenser and evaporator coils in two different locations (central residential systems) are called “split systems”.
Types of DX Equipment
DX equipment is available from about 1/2 Ton ‘window’ units, up to over 150 tons in a single unit.
Common sizes are 5 Tons in a residential furnace size commonly used in small offices, and 5 – 20 Ton units used for commercial/light industrial roof-top space cooling applications.
How they Work
Starting at the Compressor – the compressor uses electric energy to compress the refrigeration gas, increasing its temperature and pressure. The hot gas/liquid enters the outdoor Condenser Coil where the outdoor fan blows outdoor air across the coil to remove as much temperature from the hot gas/liquid as possible. The cooled gas/liquid flows to a regulator valve where it is allowed to quickly expand in the Evaporator Coil. The sudden expansion of the gas causes it to become very cold, even below freezing. The indoor fan circulates indoor air across the cold coil, causing moisture to condense (latent cooling) and the sensible air temperature to drop. The gas warmed by the indoor air then flows (is ‘sucked into’) the compressor where the cycle is repeated.