Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial
Can be avoided by proper design
Results in loss of heat due to poor heat transfer
Increases heat transfer rate

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Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
Heat supplied by the gas burner to the heat absorbed by the evaporator

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Refrigeration and Air Conditioning
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

Which lies between the wet bulb and dew point temperatures of the incoming stream
Of adiabatic saturation of incoming stream
Which is lower than the dew point temperature of the incoming stream
Which lies between the dry bulb and wet bulb temperatures of the incoming stream

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