Cooling – final temperature may not be lower
than the surroundings.
e.g. cooling the coffee or tea in the room.
Refrigeration- final temperature is always
lower than the surroundings.
e.g. cooling the water with ice cubes.
Gas cycle
-involves gas with sensible cooling and no
phase change takes place.
Vapour cycle
-involves phase change from liquid to gas in
evaporator and gas to liquid in condenser.
*Vapour compression uses mechanical
compressors.
*Vapour absorption uses thermal compressors.
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