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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Wet bulb temperature
Relative humidity
Dew point temperature
Dry bulb temperature

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Refrigeration and Air Conditioning
The specific humidity during heating and humidification process.

Increases
None of these
Decreases
Remains constant

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = ρ V l /μ
NN = μ cp/k
NN = hl/k
NN = V²/t.cp

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Water and lithium bromide
Ammonia and lithium bromide
Water and water

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Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Compressor and condenser
Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 3
1: 9
1: 1
9: 1

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