Solve Problems 7.94 and 7.95 and compare your results. Why is the change in entropy of the
Question:
Solve Problems 7.94 and 7.95 and compare your results. Why is the change in entropy of the world greater for Problem 7.95?
Problems 7.94
The air in a piston–cylinder device initially has a volume of 0.2 m3 at 100 kPa and 200° C. The air is compressed reversibly from 100 kPa to 300 kPa at a constant temperature of 200° C. The air temperature in the cylinder is maintained constant during this process as a result of heat transfer to the surrounding medium at 80° C.
Problems 7.95
The air in a piston–cylinder device initially has a volume of 0.2 m3 at 100 kPa and 200° C. The air is compressed from 100 kPa to 300 kPa at a constant temperature of 200° C. During this process, a fan mixes the air for two minutes with a power of 100 W. The air temperature in the cylinder is maintained constant during this process as a result of heat transfer to the surrounding medium at 80° C.
Step by Step Answer:
Problem 794 Given data Initial volume V1 02 m Initial pressure P1 100 kPa Final pressure P2 300 kPa Initial temperature T1 200C 47315 K Surrounding te...View the full answer
Thermodynamics Concepts And Applications
ISBN: 9781107179714
2nd Edition
Authors: Stephen R. Turns, Laura L. Pauley
