How Air Conditioning Works

Basically, the purpose of having an air conditioning system is to provide a more comfortable temperature of indoor air. Air conditioning works by altering the properties of outside air, usually the temperature and humidity, in order to make it more comfortable when distributed inside the room being ventilated. Used typically in cooling the room temperature, an air conditioning system’s cooling effect can be achieved through refrigeration cycle, evaporation or free cooling. In refrigeration cycle, heat transfer occurs which starts from a colder area to a hotter space, an opposite process to the usual which is heat transfer from a hotter place to a colder location. By this, work is required in order to take this process into effect. Such principle is also applied by the air conditioning Sydney is operating.

Evaporative cooling takes place in very dry climates where the ambient temperature is improved during hot season. The evaporative cooler works by drawing outside air through a wet pad, like a sponge soaked with water, then releases the cooled air into the dwelling occupants via the air duct system. Evaporative coolers are dependent on the outside air. Thus, during cold season where humidity is high, evaporative coolers have not much work to do. On the contrary, during hot season evaporative coolers work hard in order to convert the hot air into cool air upon releasing it to the designated space. Free cooling, on the other hand, is a process of circulating a coolant using a pump from a cold source. This system can be relied upon as it has higher cooling efficiency over the rest of the air cooling processes. To sum it up, air conditioning involves energy transfer, as heat is expelled in order to achieve a cooling effect.

Air conditioners can be installed in several ways. The most common installation type, also typically used in houses and bedrooms, is the window unit and packaged terminal. This type of installation uses no ducts because just an open window is required to set it up. The principle of evaporation-condensation is applied here such that the evaporative unit lies on the interior while the condensing unit stays on the exterior of the space being cooled. There is also the split system which comes in two forms – the mini-split or ductless system and the central or ducted air conditioning. Mini-split types are used in small room areas while central types are used in large buildings and houses. There are also portable air conditioning units most commonly used in homes and offices. Such portable units can use the refrigeration or the evaporation principle of cooling. Although having an air conditioning system can be quite expensive, there is just no monetary equivalent for the comfort that you can get in having a constant comfortable room temperature despite external weather conditions or internal heat loads. Weather conditions can be nasty especially on summer time. Internal heat loads can be obtained by increasing room occupants or heating processes inside the room like cooking, and other exothermic processes especially when using electrical appliances.