THE UNIVERSITY OF MICHIGAN
Department of Mechanical Engineering
ME 235 Thermodynamics I / Winter 2014 / Section 002
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
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