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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Stirling
Bell Coleman
Carnot
Ericson

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

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

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be higher
Will be lower
Will remain unaffected
May be higher or lower depending upon the nature of non-condensable gases

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Refrigeration and Air Conditioning
In aircraft, air refrigeration Cycle is used because of

Higher coefficient of performance
Low temperature at high altitudes
High heat transfer rate
Low weight per tonne of refrigeration

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
56 bars
Atmospheric pressure
24 bars

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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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