A piston-cylinder device contains 9.4 kg of refrigerant R-134a at 100 kPa and has a volume of 1.8 m3. The refrigerant is now heated at constant pressure until the temperature becomes 60 oC. Determine: (a) The initial temperature of the refrigerant (oC), (b) The final volume of the refrigerant ( in m3), (c) The amount of work done during the process (in kJ), (d) The change in the internal energy of the refrigerant (in kJ). Submit your solution by multiplying (a)*(b)*(c)*(d)/100000 =

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Q: (a) the final temperature, (b) the work done during this process, (c) the total heat transfers

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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.