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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
26°C DBT and 50% RH

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Refrigeration and Air Conditioning
Moisture in Freon refrigeration system causes

Freezing automatic regulating valve
High power consumption
Corrosion of whole system
Ineffective refrigeration

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

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Absolute humidity
Degree of saturation
Humidity ratio
Relative humidity

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Evaporator to the thermostat
Condenser to the expansion valve
Expansion valve to the evaporator
Condenser to the evaporator

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.8
0.5
1.25
0.25

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