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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
R-11
Ammonia
R-12

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = hl/k
NN = μ cp/k
NN = V²/t.cp
NN = ρ V l /μ

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

Atmospheric pressure
Slightly above atmospheric pressure
56 bars
24 bars

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Refrigeration and Air Conditioning
In a refrigeration system, heat absorbed in comparison to heat rejected is

More
More for small capacity and less for high capacity
Same
Less

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Refrigeration and Air Conditioning
Air conditioning means

Heating
Cooling
Dehumidifying
All of these

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Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

43833
43834
3
4

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