Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

3.72 kW
18.6 kW
1.86 kW
7.44 kW

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Refrigeration and Air Conditioning
A good refrigerant should have

Low C.O.P. and low freezing point
High operating pressures 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
The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₃ - td₂)
(td₃ - td₁)/(td₂ - td₃)
(td₂ - td₃)/(td₃ - td₁)

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