The refrigerant R-134a is cooled in a piston-and-cylinder device from 190°F to 75°F. The piston moves freely and the initial pressure is 200 psia. Determine the specific entropy change of the refrigerant, the work per lbm and heat transfer per lbm during this process.
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http://www.LearnThermo.com/T1-tutorial/ch07/lesson-B/pg20.php#P7B10
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