A pneumatic (air charged) lifting device is shown in the figure, which consists of a piston-cylinder that is connected to a high-pressure air line through a valve. In a process, the valve is opened slowly, lifting a mass. The initial volume of the piston-cylinder system after the mass is set on the piston is 0.25 m³, and contained air at 300 kPa and 17°C. The piston can be lifted up to a set of stops, at which point the volume is 1 m³. The air line is at 600 kPa and 500 K. The final pressure and temperature inside the cylinder reach 400 kPa and 350 K, respectively. Assume constant air properties at room temperature (cy=0.718 kJ/kgK, cp=1.005 kJ/kgK, R=0.287 kJ/kgK). d) Determine the heat transfer, and e) Determine the entropy generation for the process assuming that the heat transfer is with the surrounding at 17°C.

A pneumatic (air charged) lifting device is shown in the figure, which consists of a piston-cylinder that is connected to a high-pressure air line through a valve. In a process, the valve is opened slowly, lifting a mass. The initial volume of the piston-cylinder system after the mass is set on the piston is 0.25 m³, and contained air at 300 kPa and 17°C. The piston can be lifted up to a set of stops, at which point the volume is 1 m³. The air line is at 600 kPa and 500 K. The final pressure and temperature inside the cylinder reach 400 kPa and 350 K, respectively. Assume constant air properties at room temperature (cy=0.718 kJ/kgK, cp=1.005 kJ/kgK, R=0.287 kJ/kgK). d) Determine the heat transfer, and e) Determine the entropy generation for the process assuming that the heat transfer is with the surrounding at 17°C.

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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