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

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

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The cooling effect produced by melting 1 ton of ice
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The refrigeration effect to produce 1 ton of ice at NTP conditions
The standard unit used in refrigeration problems

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