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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Aluminium
Brass
Copper
Steel

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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

3.72 kW
1.86 kW
18.6 kW
7.44 kW

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Solid and dry ice
Ice at 4°C
Mixture of ice and water under equilibrium conditions
Water at 0°C

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

noisy operation
very little power consumption
quiet operation
cooling below 0°C

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

5°C
20°C
10°C
15°C

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Thermostatic expansion valve
High side float valve
Automatic expansion valve
Low side float valve

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