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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Cools below 0°C
Requires little power consumption
Gives quiet operation
Gives noisy operation

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and humidified
Heated and dehumidified
Heated and humidified
Cooled and dehumidified

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Ammonia
Carbon dioxide
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

CO2
Freon-22
Freon-12
NH3

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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
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

5
6
0.2
1.2

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