Air ConditionElectrical WorksElectricianMechanical Works

Air Conditioner


It removes heat from the enclosed space and discharges it to the outside. Once it was considered as a luxury, is now gradually becoming an essential requirement in many households.  Typically, one AC of 1.5 T capacity may consume electricity equivalent to the running of about 25 ceiling fans. In real practice, electricity cost for running an AC depends on :

  1. Its energy efficiency as designed by its manufacturer
  2. Number of operating hours
  3. Maintenance.


Basic components of the system include an:

  1. Evaporator
  2. Compressor
  3. Condenser (air-cooled or water cooled- Room ACs are air cooled)
  4. Expansion device

A refrigerant circulates in these components.


  • It vaporizes in the evaporator absorbing the heat from the warm room air drawn across the evaporator coil. This cools and dehumidifies the air.
  • The compressor raises the pressure and temperature of the refrigerant vapours.
  • The condenser condenses the refrigerant and transforms the high-pressure vapour into a high-pressure liquid.
  • Heat is rejected via outside air drawn across the condenser.
  • The expansion device transforms the high-pressure high-temperature liquid refrigerant to a low-pressure low-temperature mixture of refrigerant liquid and vapour.
  • The refrigerant goes to the evaporator, and the cooling cycle continues.

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