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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.1
0.5
0.75
0.25

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

22°C
8°C
5°C
14°C

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Increases heat transfer
Improves C.O.P. of the system
Increases power consumption
Reduces power consumption

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Refrigeration and Air Conditioning
In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

R-12
Ammonia
Sulphur dioxide
Carbon dioxide

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

24 bars
56 bars
Slightly above atmospheric pressure
Atmospheric pressure

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant entropy
Involves no change in volume
Takes place at constant pressure
Takes place at constant temperature

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