About Air Conditioning and Heat Pumps
Condenser / External Unit.
Commercial or industrial air conditioners have an external condenser unit having a coil wherein a refrigerant is circulated through the coil for heat exchange purposes. During operation, the coils are cooled by a fan which draws external air over the condenser coil.
Internal unit / Evaporator.
When the working fluid leaves the condenser, its temperature is much cooler and it has changed from a gas to a liquid under high pressure. The liquid goes into the evaporator through a very tiny, narrow hole. On the other side, the liquid's pressure drops. When it does it begins to evaporate into a gas. As the liquid changes to gas and evaporates, it extracts heat from the air around it. The heat in the air is needed to separate the molecules of the fluid from a liquid to a gas. The evaporator also has metal fins to help in exchange the thermal energy with the surrounding air. By the time the working fluid leaves the evaporator, it is a cool, low pressure gas. It then returns to the compressor to begin its trip all over again.
Controller.
The controller can vary from a wireless handheld unit to a wall mounted control center. This is how you control the temperature and timing of each unit.
