Two kilograms of nitrogen at 40°C are placed in a piston cylinder device under 10 kPa pressures (Figure Q1). Heat is added to the nitrogen at constant pressure until the temperature of the nitrogen reaches 300°C. Assume that the nitrogen is an ideal gas and taken R= 0.2968 kJ/kgK. i) Determine the initial and final volume of the nitrogen per unit kg. ii) Determine the work done by the nitrogen (kJ) and heat transferred to the nitrogen (kJ) during this process. iii) Sketch the process in pressure versus volume diagram. (P-v diagram)

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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.