HW07_solns[1] - refrigerant-134a vapor.” The problem on...

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San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 Homework 7 solutions NOTE : Solutions for HW problems that are based upon textbook problems reflect numerical values from the text. Numerical values may differ for these problems when they appear on iLearn. In such cases, the solution presented below provides the appropriate solution method . 1. The correct choice is (c): zero or positive. 2. For an irreversible process, Sgen must be positive. Therefore, the entropy change of the system can only be zero if entropy is transferred out of the system. This can only occur if heat is transferred out of the system (entropy transfer accompanies heat transfer). The correct choice is (c).
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