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
7.44 kW
1.86 kW

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with ozone layer
These react with plants and cause greenhouse effect
These react with water vapour and cause acid rain
These react with oxygen and cause its depletion

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Ensures the evaporator completely filled with refrigerant of the load
Is suitable only for constant load systems
Maintains different temperatures in evaporator in proportion to load
None of these

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