Central Air Conditioner

Central air conditioners are known to cool the entire house and these air conditioners use ducts to distribute cooled air throughout the house. The most commonly used central air conditioner is the split system that has the condenser outside the house and the fan along with the coil inside the home. Both these units are connected by pipes carrying refrigerants. However, it needs to be noted here that all houses cannot have the duct systems to install central air conditioners, in such cases the ductless split systems are viable option.

As far as the types of central air conditioners are concerned, they are either split systems or the packaged unit. In a split-system central air conditioner, the outdoor unit comprises the compressor and the condenser while the indoor unit has the evaporator. There are many split systems in which the indoor unit also has the furnace or the indoor part of a heat pump.

On the other hand, in a packaged central air conditioner, the evaporator, the condenser, and the compressor all are located in one cabinet which is usually placed on the roof of the house or on a concrete slab beside the foundation of the house. Packaged central air conditioners are generally installed in small commercial buildings.

Now let us have a look as to how central air conditioners work. Generally, central air conditioners has a primary appliance like the air handler or the furnace located in the basement or in the attic. It is this appliance that pumps chilled air throughout the house with the help of ducts. One or more thermostats in the house turn off or on the cooling system depending upon the rise and fall in the room temperature.

One must be aware of the fact a central air conditioner runs on electricity and removes heat from the air applying the simple principles of refrigeration. When the thermostat signals the system to lower the temperature, it is then that a whole sequence of events follows one after the other.

In the very beginning, the air handler system starts drawing m air from various parts of the room through the return air ducts. The air the passes through a filter where the air borne particles and lint are removed from the air. In recent times, there are some improved air filter systems which removes even microscopic pollutants from the air. Once the air has been cleared from all its impurities it is routed to the air-supply duct work that carries it back to the rooms.

It is the refrigerant such as Freon that circulates through the copper tubing that runs between the various components of the air conditioner. The refrigerant receives and releases heat as it raises and lowers in temperature. The refrigerant changes form from liquid to gas and again back to liquid during the entire process. However, the refrigerant is cold when it begins to circulate through the indoor coil.

When the air handler pushes warm air across the coil, the refrigerant absorbs quite a lot of heat and it gets converted to vapor from a liquid state. In the vapor state, it travels to the compressor that pressurizes it and moves it through the outdoor coil that jettisons the heat. There is a fan that helps in dissipating the heat. Then the refrigerant passes through an expansive device that converts it to a low-pressure and low-temperature liquid which returns to the indoor coil. And it is this cycle that goes on.




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