Window Air-Conditioner (Room Air-Conditioner)

WINDOW AIR-CONDITIONER (ROOM AIR-CONDITIONER)

Window air-conditioner is also know as room  air-conditioner

• It is designed to condition the air in a single room or a large scale.

• It is called a window air-conditioner because it is usually installed in a window.

Construction

A layout of a window air-conditioner is shown in fig. 2.9.

The main components of a window air-conditioner are given  below

(i) Compressor

(ii)  Condenser

(iii) Air filter

(iv) Evaporator

(v) Motor

(vi) Fans

(vii) Thermostat

• The whole unit is divided into two units as indoor unit moand outdoor unit.

• The indoor unit consists of an evaporator, air filter, motor driven fan, control panel, trays, etc.

• The outdoor unit consists of a compressor unit, condenser, trays and motor driven fan.

• All the components are enclosed in a single unit

• It follows the vapour compression refrigeration system.

Working

• The evaporator fan sucks the air from the room to be conditioned through air filter. It passes the air over the evaporator (cooling) coil.

• In the evaporator, the liquid refrigerant picks up heat Jing 100 from the room air. This cool air brings down the temperature and humidity levels in the room and provides comfortable conditions.

• The compressor compresses the low-pressure vapour refrigerant coming from the evaporator. It converts refrigerant into high-pressure vapour refrigerant.

• The high-pressure vapour refrigerant is then passed into the condenser where it is cooled.

• Outside air is drawn in by the another fan (which is also driven by same motor.) Thus, it cools the refrigerant to become liquid

• The high-pressure low-temperature liquid refrigerant from the condenser enters the capillary tube (ie., Tenoitib expansion valve).

• The pressure and temperature of the refrigerant drops when it leaves the tube. Then, the low-temperature refrigerant from the tube passes to the evaporator coil.

• In the evaporator, the liquid refrigerant picks up heat and gets vapourised. This cycle repeats again and again.

• The unit stops automatically when the required temperature is reached in the room by help of  thermostat.

Advantages of the Window air-conditioner

• For each unit, an individual temperature control device is provided.

• For air distribution, ducts are not required.

Disadvantages of the Window air-conditioner

• The unit is installed outside the wall.

• This unit has a fixed air quantity.