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Tech Note #6

The Basic Refrigerant Cycle
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 Low pressure refrigerant
 High pressure refrigerant

 

Basic refrigeration system: 


  • Starting at the compressor; 


  • Low pressure vapor refrigerant is compressed and discharged out of the compressor.


  • The refrigerant at this point is a high temperature, high pressure, superheated vapor. 


  • The high pressure refrigerant flows to the condenser by way of the "Discharge Line".


  • The condenser changes the high pressure refrigerant from a high temperature vapor to a low temperature liquid and leaves through the "Liquid Line".


  • The high pressure refrigerant then flows through a filter dryer to the Thermal Expansion valve or TXV. 

  • The TXV meters the correct amount of liquid refrigerant into the evaporator.

  •  As the TXV meters the refrigerant, the high pressure liquid changes to a low pressure, low temperature, saturated vapor. 

  • This saturated vapor enters the evaporator and is changed to a low pressure dry vapor. 

  • The  low pressure dry vapor is then returned to the compressor in the "Suction line".

  • The cycle then starts over.