A container equipped with a resistance heater and a mixer is initially filled with 3.6 kg of saturated water vapor at 120°C. Now the heater and the mixer are turned on; the steam is compressed, and there is heat loss to the surrounding air. At the end of the process, the temperature and pressure of steam in the container are measured to be 300°C and 0.5 MPa. The net energy transfer to the steam during this process is(a) 274 kJ (b) 914 kJ (c) 1213 kJ(d) 988 kJ (e) 1291 kJ

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Q: A 3000 cm' tank initially contains compressed air at 600 kPag and 28 °C. Determine the mass of air…

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Q: 77 kg of saturated water mixture is contained in a piston cylinder device initially at 450 kPa with…

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Q: A 1 m^ 3 rigid tank contains hydrogen at 250 kPa and 420 K. The gas is now cooled until its…

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Q: Nitrogen gas is compressed from 80 kPa and 27°C to 480 kPa by a 10-kW compressor. Determine the mass…

A: The mass flow rate can be found from the compressor power and the work of compression as follows:

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Q: A rigid tank contains 5 kg of refrigerant-134a initially at 20°C and 140 kPa. The refrigerant is now…

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Q: A rigid vessel contains 5 kg of wet steam at 0.4 MPa. After the addition of 9585 kJ the steam has a…

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Q: A piston–cylinder device contains 15 kg of air at 599 kPa and 38oC. During a quasi-equilibium…

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Q: A 0.8-m3 rigid tank contains carbon dioxide (CO2) gas at 250 K and 100 kPa. A 500-W electric…

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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.