It is required to maintain a large cold storage at 10 oC while the ambient temperature is 40 oC. The energy losses as heat from the walls of the cold storage are estimated at 12 kJ /s per degree Celsius temperature difference between the ambient and the cold space. Determine the minimum power required to maintain the cold storage at 10 oC.
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Heat pumps, air conditioners, and refrigerators utilize heat transfer from cold to hot. They are heat engines run backward. We say backward, rather than reverse, because except for Carnot engines, all heat engines, though they can be run backward, cannot truly be reversed. Heat transfer occurs from a cold reservoir Qc and into a hot one. This requires work input W, which is also converted to heat transfer.
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