A heat engine, a heat pump, and a refrigerator receive 500 kJ of heat each. But they reject 250 kJ, 600 kJ and 700 kJ of heat respectively. Determine the efficiency of heat engine, the COP of the heat pump and the refrigerator.

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.