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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The mass of water vapour present in __________ is called absolute humidity.

1 kg of dry air
1 m3 of dry air
1 m3 of water
1 kg of wet air

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Refrigeration and Air Conditioning
In a refrigeration system, heat absorbed in comparison to heat rejected is

Less
Same
More
More for small capacity and less for high capacity

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Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

Increases C.O.P
O.P remains unaltered
Decreases C.O.P
Other factors decide C.O.P

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Refrigeration and Air Conditioning
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

(hA - h1)/ (h2 - h1)
(h1 - h2)/ (hA - h2)
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)

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Refrigeration and Air Conditioning
The process, generally used in winter air-conditioning to warm and humidity the air, is called

Dehumidification
Heating and humidification
Cooling and dehumidification
Humidification

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

P.F. - 1
1/ B.P.F.
1 - B.P.F.
1 + B.P.F.

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