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AREpodcast Episode 4 Refrigeration

August 18, 2011
To change the temperature in a room, hotter or colder, relies on the second law of thermodynamics. It simply states that differences in temperature will seek out equilibrium. Meaning if a source of heat, or cooling is introduced into a space the space will change in temperature.
In a refrigerator unit there are several basic components.

  1. Refrigerant – the medium of heat transfer in a refrigerant system which absorbed heat by evaporation at low temperatures and pressure and gives up heat on condensing at higher temperatures and pressures.
  2. Compressor – a machine for compressing refrigerant vapor.
  3. Condenser – a heat-exchanging device that consists of an arrangement of pipes where refrigerant vapor is liquefied (condensed) by the removal of heat.
  4. Evaporator – where refrigerant is vaporized, thereby taking up the external heat and producing cooling.
  5. Expansion Valve – controls the flow of refrigerant to evaporator and allows the refrigerant to be changed into a vapor again

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