A vertical piston–cylinder device initially contains 0.20 m3 of air at 300 0C by placing 580 kg on the piston (Patm = 97 kPa). The piston has a mass of 5 kg and a diameter of 12 cm. A valve connected to the cylinder is now opened, and air is allowed to escape until three-quarters of the mass leave the cylinder at which point the final temperature in the cylinder is 180 0C. Determine the boundary work during this process. a. 99 kJ b. None of these c. 128 kJ d. 85 kJ e. 115 kJ f. 120 kJ

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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.