Refrigeration and Air Conditioning
A good refrigerant should have

High operating pressures and low freezing point
Low C.O.P. and low freezing point
High specific volume and high latent heat of vaporisation
High latent heat of vaporisation and low freezing point

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Refrigeration and Air Conditioning
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

Smaller cabinet should be used
Perfectly tight vapour seal should be used
Bigger cabinet should be used
Refrigerant with lower evaporation temperature should be used

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