Windows air Conditioning | Working , Components and Application
Introduction to Air Conditioning :
Air conditioner is a device used to condition the air according to human comfort. Air is consisting of humidity, temperature, dust etc. The presence of these constituents makes the people to feel discomfort and reduces the efficiency of persons. Therefore air has to be conditioner depending upon the requirement. Generally in coastal areas the humidity level is more hence wet air prevails, so air has to be dehumidified using air conditioner. In the tropical areas dry air prevails hence air has to be humidified using air conditioner. Thus air conditioner may be classified according to season as Summer.
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Air Conditioner & Winter Air Conditioner.
Types of Air Conditioner:
1. Window Air Conditioner
2. Spilt type Air Conditioner
WINDOW AIR CONDITIONER:
The refrigerant vapour at high pressure and temperature is supplied by the compressor to the condenser. A propeller type fan is used to draw air from atmosphere and to circulate through the condenser coil. The air cools the refrigerant vapour and it becomes liquid.
The refrigeration cycle consists of the following processes .
1) Condensing coil 2) Expansion valve, 3) Evaporator coil, 4) Compressor.
Initially, a heat pump transfers heat from a lower-temperature heat source into a higher temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior and into the room in which it stands.
The most common refrigeration cycle uses an electric motor to drive a compressor. Since evaporation occurs when heat is absorbed, and condensation occurs when heat is released, air conditioners use a compressor to cause pressure changes between two compartments, and actively condense and pump a refrigerant around. A refrigerant is pumped into the cooled compartment (the evaporator coil), where the low pressure causes the refrigerant to evaporate into a vapor, taking heat with it. In the other compartment (the condenser), the refrigerant vapor is compressed and forced through another heat exchange coil, condensing into a liquid, rejecting the heat previously absorbed from the cooled space. Air conditioning equipment usually reduces the humidity of the air processed by the system and hence produces the effect.
The refrigeration systems consists of :
The compressor used in window air conditioner is of hermetic type. The refrigerant vapour is compressed to high pressure and temperature in the condenser.
b) Air-cooled condenser
It is used to cool the high pressure high temperature refrigerant vapour. It is continuous coil made of copper tubing. A propeller type fan is used to draw the necessary air from atmosphere to cool the refrigerant.
c) Capillary tube
It is an expansion device. It is used to reduce the pressure and temperature of the refrigerant.
It is cooling coil made of copper. A centrifugal blower is installed behind the coil to deliver cool air from the evaporator to the room. The blower also sucks warm air from the room and sends it to the evaporator through a Filter.
1) Used in offices, hotels, buses, cars, aero planes for human comfort.
2) Used in textile industries to control moisture.
3) Used in printing press, food industries, chemical plants etc.,
Window air conditioner is also known as room air conditioner, and is usually fitted in the window or any opening made in the wall of suitable dimensions. This is then packed with insulating material like thermocoal to achieve better efficiency
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