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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The specific humidity during humidification process

Remains constant
Decreases
Increases
None of these

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Refrigeration and Air Conditioning
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

Same
Higher
Lower
None of these

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Refrigeration and Air Conditioning
Air conditioning means

Heating
Cooling
Dehumidifying
All of these

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

3 kW
4 kW
2 kW
1 kW

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
e₁ + e₂
e₁e₂

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

20°C DBT and 80% RH
25°C DBT and 100% RH
22°C DBT and 60% RH
25°C DBT and 40% RH

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