Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Compression of the refrigerant vapour
Condensation of the refrigerant vapour
Metering of the refrigerant liquid
Evaporation of the refrigerant liquid

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Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
One tonne is the total mass of machine
One tonne refrigerant is used
One tonne of water can be converted into ice

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Refrigeration and Air Conditioning
A refrigeration system

Removes heat from a high temperature body and delivers it to a low temperature body
Rejects energy to a low temperature body
None of the listed here
Removes heat from a low temperature body and delivers it to a high temperature body

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