Excerpt from Refrigeration: An Elementary Text-Book
It is the same with heat pumps (refrigerating apparatus) -they require the expenditure of energy in order to drive them, the amount of energy depending on the quantity of heat removed and the height through which it is raised.
The foregoing indicates that the science of Heat should claim the first consideration of the student in.
Refrigeration, particularly in its effects upon matter, its measurement, the transference of heat from substance to substance direct and also through intervening media, and the elementary ideas of the more important laws which have been established.
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