Refrigeration and Air Conditioning
During sensible cooling,

Relative humidity remains constant
Wet bulb temperature increases
Partial pressure of vapour remains constant
Specific humidity increases

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Refrigeration and Air Conditioning
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

1 to 2 h.p. per ton of refrigeration
0.5 to 0.8 h.p. per ton of refrigeration
0.1 to 0.5 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration

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Refrigeration and Air Conditioning
A good refrigerant should have

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

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