Two identical metal blocks, each weighing 25 kg and having a specific heat of 0.4 kJ/kg, are first heated to a temperature of 50 degrees Celsius. A refrigerator that is reversible accepts heat from one block and denies it to the other. Determine how much effort the refrigerator must do to generate a temperature differential of 150 degrees Celsius between the two blocks.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.