Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Increased to a value above its critical temperature
Equal to critical temperature
Reduced to a value below its critical temperature
None of these

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

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Refrigeration and Air Conditioning
It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be

Dehumidification and pure sensible cooling
Dehumidification
Cooling and humidification
Cooling and dehumidification

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