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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

Unpredictable
Equally
More
Less

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

Of cooling medium
Of freezing zone
Of evaporator
At which refrigerant gas becomes liquid

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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

7.44 kW
1.86 kW
18.6 kW
3.72 kW

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Refrigeration and Air Conditioning
One of the purposes of sub cooling the liquid refrigerant is to

Reduce compressor overheating
Reduce compressor discharge temperature
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Increase cooling effect

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Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Sum of (A) and (B)
Heat dissipated to the surroundings
Difference of (A) and (B)
Heat stored in the human body

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Ice at 4°C
Mixture of ice and water under equilibrium conditions
Solid and dry ice
Water at 0°C

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