Classification of Air Conditioning Systems , Window Air- Conditioner

1 12 - Classification of Air Conditioning Systems , Window Air- Conditioner
1 12 672x521 - Classification of Air Conditioning Systems , Window Air- Conditioner

The air conditioning may be broadly classified as follows:

  1. According to the purpose Comfort
  • air conditioning system
  • Industrial air conditioning system,
  1. According to the season of the year Winter air conditioning system,
  • Summer air conditioning,
  • Year-round air conditioning.
  1. According to the arrangement of equipment
  • Unitary air conditioning system
  •  Central air conditioning system.

Window Air- Conditioner

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1 12 640x497 - Classification of Air Conditioning Systems , Window Air- Conditioner

Figure shows the schematic diagram of a window air-conditioner. The window air-conditioner works on the vapour compression refrigeration cycle. The basic components of the system are compressor, condenser, a capillary tube and an evaporator, in addition, filters, accumulators, motors, fan and electrical controls from the rest of components. The high pressure gas (refrigerant), which comes out of the compressor, is condensed in the condenser using ambient air as a coolant. The liquid refrigerant is expanded in a capillary tube and the n enters the evaporator. Here, it evaporates and causes the refrigerating effect. Then fan blows the fresh air over the evaporator coil, which cools the air. The cool air is supplied the room. Meanwhile, refrigerant from the evaporator enters the compressor to be compressed and the cycle is repeats itself.

The return air from the room is exhausted by the evaporator fan by blowing air over the condensed coil, where it picks up heat from the refrigerant. The compressor used in a window air-conditioner is hermetic type, which is sealed in a casing with a motor as shown in the figure. The condenser and evaporator fans are both propeller type. The condenser coil is a continuous copper coil with aluminum fins. The capillary tube is 40cm long, usually with 0.75mm diameter. Evaporator coil is also made of copper with aluminum fins. Dampers and louvers are provided for intake and exhaust on both sides of the air-conditioner casing. A one tone window air-conditioner circulaets4m3/min of air in the room. Some fraction of air (25%) is fresh; where as some fraction (75%) of air is recirculated. Filters are used to filter air entering the A/C unit. The filter is plastic foam or metallic mat type. The controls used by the unit are
1)Thermostat Control:
This is used to set the room temperature. Usually it is a bimetallic strip.
2)Master Control
It is an electrical switch used to stop or start the compressor motor.
The installation of the unit is done either in the wall or by using external brackets or locating it inside the room with exhaust flush to the window. In either case, the condenser should be facing outside and the evaporator should be facing inside. It is advisable to install the unit for a minimum sun exposure as sun’s rays can diminish the efficiency of the condenser. The air louver inlets should not be blocked and provision for draining of the condensate (like a pipe) should be provided. Maintenance of the window air-conditioner should include periodic cleaning, replacing filters and air seals and lubrication of fans.

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