Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning
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In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
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In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
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The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is
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In a lithium bromide absorption refrigeration system
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A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
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In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
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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
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Which of the following statement is wrong?
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A.
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
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B.
In vapour compression cycle, the useful part of the heat transfer is at the condenser.
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C.
In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required.
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D.
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.
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