A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C. Initially the piston is fixed with a pin. The piston-cylinder assembly is heated from a heat source at 150 ° C and the pressure rises to 0.32 MPa. Then the pin is pulled and heat is transferred to an environment at 25 ° C, allowing the R-134a refrigerant to reach 50 ° C at constant pressure.
A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C. Initially the piston is fixed with a pin. The piston-cylinder assembly is heated from a heat source at 150 ° C and the pressure rises to 0.32 MPa. Then the pin is pulled and heat is transferred to an environment at 25 ° C, allowing the R-134a refrigerant to reach 50 ° C at constant pressure.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C. Initially the piston is fixed with a pin. The piston-cylinder assembly is heated from a heat source at 150 ° C and the pressure rises to 0.32 MPa. Then the pin is pulled and heat is transferred to an environment at 25 ° C, allowing the R-134a refrigerant to reach 50 ° C at constant pressure.
a) Calculate the amount of heat and work transfer in processes.
b) Calculate the entropy generation in processes. Comment on the conformity of the processes to the second law of
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