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REFRIGERATION AND AIR CONDITIONING

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

1.86 kW
7.44 kW
3.72 kW
18.6 kW

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Ammonia vapour is driven out of solution
Ammonia vapour goes into solution
Weak solution mixes with strong solution
Lithium bromide mixes with ammonia

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Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

Negative
None of the listed here
Zero
Positive

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 9
9: 1
1: 3
1: 1

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

10 tons
40 tons
0.1 ton
5 tons

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