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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

3.33
4.33
2.33
1.33

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Refrigeration and Air Conditioning
During sensible cooling of air, specific humidity

Increases
Remains constant
None of the listed here
Decreases

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Freezing at the expansion valve
All of these
Restriction to refrigerant flow
Corrosion of steel plates

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Refrigeration and Air Conditioning
The C.O.P. of a heat pump working on a reversed Carnot cycle is

(T₂ - T₁)/T₁
T₁/(T₂ - T₁)
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)

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Refrigeration and Air Conditioning
The optimum effective temperature for human comfort is

Same in winter and summer
Not dependent on season
Higher in winter than in summer
Lower in winter than in summer

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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

18.6 kW
1.86 kW
7.44 kW
3.72 kW

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