
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text: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.
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