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

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

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Refrigeration and Air Conditioning
A good refrigerant should have

High latent heat of vaporisation and low freezing point
Low C.O.P. and low freezing point
High operating pressures and low freezing point
High specific volume and high latent heat of vaporisation

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Refrigeration and Air Conditioning
The relative humidity is defined as

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
The mass of water vapour present in 1 m3 of dry air
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
The mass of water vapour present in 1 kg of dry air

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