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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

Zero
Negative
Positive
None of the listed here

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Air conditioning
Commercial refrigerators
Gas liquefaction
Domestic refrigerators

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Refrigeration and Air Conditioning
In vapour compression cycle the condition off refrigerant is dry saturated vapour

After passing through the expansion or throttle valve
Before passing through the condenser
Before entering the compressor
After passing through the condenser

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12
1.25
1
2.15

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Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

43834
3
43833
4

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Refrigeration and Air Conditioning
During sensible heating of air _________ decreases.

Specific humidity
Wet bulb temperature
Relative humidity
Dry bulb temperature

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