Aluminium with a mass of 100 kg and an initial temperature of 20, 6\deg C is to be melted in an electric are furnace in one hour. The aluminium has a melting point of 934 Kelvins, a specific heat capacity of 952 J/kg. K and a specific latent heat of fusion of 452.8 kJ/kg. The efficiency of the furnace is 79.8% and the cost of electrical energy is 41.9c/ KWh. Calculate the active power required.

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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.