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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 + C.O.P
1 - (1/C.O.P)
1 - C.O.P.
1 + (1/C.O.P)

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Sulphur sticks which on detection gives white smoke
Using reagents
Smelling
Halide torch which on detection produces greenish flame lighting

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Electrolux refrigerator
Vapour compression
Carnot cycle
Vapour absorption

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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

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

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Dry bulb temperature
Relative humidity
Specific humidity
Wet bulb temperature

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Increases heat transfer
Improves C.O.P. of the system
Reduces power consumption
Increases power consumption

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