Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Much above critical pressure
Critical pressure of refrigerant
Near critical pressure
Much below critical pressure

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Refrigeration and Air Conditioning
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

0.5 to 0.8 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration
0.1 to 0.5 h.p. per ton of refrigeration
1 to 2 h.p. per ton of refrigeration

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Refrigeration and Air Conditioning
The relative humidity is defined as

The mass of water vapour present in 1 m3 of dry air
The mass of water vapour present in 1 kg 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 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

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