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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

increases
depends on other factors
remains same
decreases

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Refrigeration and Air Conditioning
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

Sulphur dioxide
Carbon dioxide
Lithium bromide
R-12

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Refrigeration and Air Conditioning
Chaperon equation is applicable for registration at

Sublimation temperature
Triple point
Saturation point of vapour
Saturation point of liquid

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Refrigeration and Air Conditioning
Chaperon equation is a relation between

Temperature, pressure, specific volume and enthalpy
Temperature, pressure and enthalpy
Temperature and enthalpy
Specific volume and enthalpy

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

5
1.2
6
0.2

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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
2.15
1.25

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