TAILIEUCHUNG - Lecture Companion site to accompany thermodynamics: An engineering approach (7/e): Chapter 7.2 - Yunus Çengel, Michael A. Boles

Chapter - Entropy: A measure of disorder. The objectives of this chapter are to: Derive the reversible steady-flow work relations; develop the isentropic, or adiabatic, efficiencies of various steady-flow engineering devices and apply the definitions to turbines, compressors, and nozzles; introduce and apply the entropy balance to various systems. | Chapter 7 Continued Entropy: A Measure of Disorder Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 7th edition by Yunus A. Çengel and Michael A. Boles Example 7-9 Air, initially at 17oC, is compressed in an isentropic process through a pressure ratio of 8:1. Find the final temperature assuming constant specific heats and variable specific heats, and using EES. a. Constant specific heats, isentropic process For air, k = , and a pressure ratio of 8:1 means that P2/P1 = 8 specific heat method Using the air data from Table A-17 for T1 = (17+273) K = 290 K, Pr1 = . Interpolating in the air table at this value of Pr2, gives T2 = K = c. A second variable specific heat method. Using the air table, Table A-17, for T1 = (17+273) K = 290 K, soT1 = kJ/kg K. b. Variable specific heat method For the isentropic process At this value of soT2, the air table gives T2 = K= . This

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