1. Answer the following questions. (i) Consider water substance at an absolute pressure of 20 bar and a temperature of 50°C. What is the specific internal energy of water, in kJ/kg? 209.33 906.14 What is the specific enthalpy of water, in kJ/kg? 209.33 211.34 2599.1 2591.3 2442.7 2798.3

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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.