Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Constant pressure expansion process
Isentropic compression process
Isentropic expansion process
Constant pressure cooling process

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Refrigeration and Air Conditioning
The bypass factor for a cooling coil

Decreases with increase in velocity of air passing through it
Remains unchanged with increase in velocity of air passing through it
May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
Increases with increase in velocity of air passing through it

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Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne refrigerant is used
One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
One tonne of water can be converted into ice
One tonne is the total mass of machine

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with oxygen and cause its depletion
These react with ozone layer
These react with water vapour and cause acid rain
These react with plants and cause greenhouse effect

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