The principle of vapour compression system is that fluids absorb heat while changing from a 

1
Vapour phase to liquid phase and give up heat in changing from liquid phase to vapour phase
2
Liquid phase to vapour phase and give up heat in changing from a vapour phase to liquid phase
3
Vapour phase to liquid phase only
4
Liquid phase to solid state phase and give up heat in changing from a solid state to liquid phase 

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