Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Water and water
Water and lithium bromide
Ammonia and water
Ammonia and lithium bromide

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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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Refrigeration and Air Conditioning
In a bootstrap air evaporative cooling system, the evaporator is provided

Between the second heat exchanger and the cooling turbine
Between the first heat exchanger and the secondary compressor
Between the secondary compressor and the second heat exchanger
Between the combustion chamber and the first heat exchanger

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