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# HW9_Problems.pdf

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School
University of Michigan - Ann Arbor
Department
Mechanical Engineering
Course
MECHENG 235
Professor
Donald Siegel
Semester
Winter

Description
THE UNIVERSITY OF MICHIGAN Department of Mechanical Engineering ME 235 Thermodynamics I / Winter 2014 / Section 002 HW 9 Due date: Mar. 27 2014 6.25 Determine the missing property among P, T, s, and x for R-410A at: a. T = –20C, v = 0.1377 m /kg 3 b. T = 20C, v = 0.01377 m /kg c. P = 200 kPa, s = 1.409 kJ/kgK 6.30 Two kg water at 120°C with a quality of 25% has its temperature raisedC in a constant volume process. What are the new quality and specific entropy? 6.44 A piston cylinder maintaining constant pressure contains 0.1 kg saturated liquid water C. It is now boiled to become saturated vapor in a reversible process. Find the work term and then the heat transfer from the energy equation. Find the heat transfer from the entropy equation, is it the same? 6.49 A piston/cylinder has 2 kg water at 1000 kPa, 2C which is now cooled with a constant loading on the piston. This isobaric process ends when the
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