If the temperature is above the set or desired value, it makes the compressor to switch “ON”. The fan used may be propeller type or centrifugal type. The air is cooled while passing over the evaporator tubes by giving its heat to the refrigerant circulating inside the evaporator. A thermostat (in control panel) is provided at the evaporator to measure the temperature of air coming from the room. The air from the room is drawn over the evaporator fan (also called as indoor fan) through a filter, which removes dirt, dust, impurities etc. The air circuit of a window air conditioner consists of 3 major air circulation systems. Window air conditioning system does not require ducts for free delivery of conditioned air into room to be cooled.įig. Distributing the air to each and every corner of room.The function of window air conditioner is to provide comfort to the occupants in the room by, Air Circuit of Window Air Conditioning System High pressure, high temperature vapour refrigerant coming out of compressor is condensed in condenser using outside (atmospheric) air as cooling medium. The liquid refrigerant is further passed through capillary tube to reduce its own pressure and then passed over evaporator, where it absorbs heat from air to cool it. Due to absorption of heat, the liquid refrigerant gets converted into vapour refrigerant and these vapours are drawn into the compressor and cycle is repeated again and again. Operation of Window Air Conditioning System It is located in return air path near filter. It is used to ensure desired temperature conditions inside the room. When switch is on cool position, all motors operate and complete unit works as air conditioning unit. It controls the compressor, compressor motor, condenser fan motor and evaporator fan motor. Window air conditioner is provided with two controls: Either permanent or replaceable filters are used. In a window air conditioner, air filter is located on the air entering side of evaporator coil. The fresh air mixes with room air together and is passed over evaporator coil.Īir should be fltered, as soon as, it enters the air conditioner. Evaporator is surrounded by insulating material, such that, it reduces operating noise. A propel er type fan is located in front of evaporator, so that, it can pul the fresh air from outside through ventilation dampers. It is located at the front end of room air conditioner. It is also made up of copper tubing, like condenser coils. It is a tube of very small diameter and long length. Its function is to reduce the pressure of high pressure, low temperature liquid refrigerant coming from condenser and convert it Into low pressure, low temperature liquid refrigerant. In short, it creates pressure drop, when liquid refrigerant is passed through it. It is air cooled type condenser having continuous coil of copper tubing, to which, aluminium fins are attached to increase surface area, through which, more heat transfer can take place. A propeller type fan is located immediately in front of condenser to cool the condenser coil.Ĭapillary tube is the most commonly used expansion device in window air conditioner. This type of compressor has its motor and all moving parts operating within a sealed gas tight housng. It is of hermetically sealed type compressor. Window air conditioning system consists of following components: Capillary tube),Īl the above mentioned components are briefly discussed in the following manner. Window air conditioning system consists of following components: Construction of Window Air Conditioning System Window air conditioner is a small unit having capacity of 1/2 TOR to 3 TOR. Window air conditioner is a room air conditioner mounted in a window, through a wall.
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