A suction line liquid line heat exchanger cause

  1. Subcooling of liquid refrigerant entering the expansion device
  2. Superheating of the suction vapour
  3. May increase or decrease COP
  4. All of the above

Answer (Detailed Solution Below)

Option 4 : All of the above
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Detailed Solution

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A liquid line and suction line heat exchanger are used to transfer heat between liquid refrigerant leaving the condenser on the high-pressure side of the system and refrigerant vapour leaving the evaporator on the low-pressure side of the system.

This heat transfer causes following effects

  • To raise the vapour temperature (Superheating) to prevent frosting or condensation on the suction line
  • To evaporate any remaining liquid in the vapour stream to prevent possible compressor damage
  • To sub-cool the liquid to prevent flash gas in the liquid line
  • To increase the system refrigerating capacity

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