A 0.5-m³ rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat istransferred now to the refrigerant from a source at 35°C until the pressure rises to 450 kPa.Determine:a. The entropy change of the refrigerant.b. The entropy change of the heat source.C.The total entropy change for this process.Using EES software, investigate the effect of the source temperature and final pressure on the totalentropy change for the process. Let the source temperature vary from 30°C to 210°C, and the finalpressure vary from 300 to 500kPa. Plot the total entropy change for the process as a function of thesource temperature for final pressures of 300 kPa, 400 kPa, and 500 kPa, and discuss the results.

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A 0.5-m3 rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is transferred now to the refrigerant from a source at 35°C until the pressure rises to 450 kPa. Determine: a. The entropy change of the refrigerant. b. The entropy change of the heat source. C. The total entropy change for this process.

A 0.5-m3 rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is transferred now to the refrigerant from a source at 35°C until the pressure rises to 450 kPa. Determine: a. The entropy change of the refrigerant. b. The entropy change of the heat source. C. The total entropy change for this process.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

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.

Question

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A 0.5-m³ rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is
transferred now to the refrigerant from a source at 35°C until the pressure rises to 450 kPa.
Determine:
a. The entropy change of the refrigerant.
b. The entropy change of the heat source.
C.
The total entropy change for this process.
Using EES software, investigate the effect of the source temperature and final pressure on the total
entropy change for the process. Let the source temperature vary from 30°C to 210°C, and the final
pressure vary from 300 to 500kPa. Plot the total entropy change for the process as a function of the
source temperature for final pressures of 300 kPa, 400 kPa, and 500 kPa, and discuss the results.

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