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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m/h
m²/hK
m²/h
m/hK

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
56 bars
Atmospheric pressure
24 bars

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Refrigeration and Air Conditioning
During sensible cooling,

Relative humidity remains constant
Specific humidity increases
Wet bulb temperature increases
Partial pressure of vapour remains constant

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Refrigeration and Air Conditioning
Air conditioning means

Heating
Dehumidifying
All of these
Cooling

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Refrigeration and Air Conditioning
The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

0.376
0.4
0.6
0.67

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

Cooling and dehumidification
Humidification
Heating and humidification
Dehumidification

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