In a piston-cylinder system, there is 3 kg of refrigerant-134a initially at 1.2 MPa and 50°C. The refrigerant undergoes a cooling process at constant pressure until it reaches a state where it exists as a liquid at 15°C. Given that the surroundings are at 150 kPa and 16°C. (a) Sketch a schematic diagram to represent the question and states determine (b) the exergy of the and (b) the exergy refrigerant at the initial and final states destruction during this process 2

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Q: device expends 142.26 kJ of energy while pressurizing 3.93 kg of water initially at 12.88°C. The…

A: Given:Q=142.26 KJm=3.93 KgT1=12.88°Cη=59.73%

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.