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Unformatted text preview: 1 Indian Institute of Technology Kharagpur Department of Mechanical Engineering Thermodynamics ME22002 Tutorial 5 (Entropy) 1. A 0.5-m 3 rigid tank contains refrigerant-134a initially at 200 kPa and 40 percent quality. Heat is transferred now to the refrigerant from a source at 35°C until the pressure rises to 400 kPa. Determine (a) the entropy change of the refrigerant, (b) the entropy change of the heat source, and (c) the total entropy change for this process. Answers: (a) 3.880 kJ/K, (b) -3.439 kJ/K, (c) 0.441 kJ/K. 2. An insulated piston – cylinder device contains 0.05 m 3 of saturated refrigerant- 134a vapor at 0.8-MPa pressure. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 0.4 MPa. Determine (a) the final temperature in the cylinder and (b) the work done by the refrigerant. Answer: 8.91 ° C, 27.09kJ. 3. Steam at 6000 kPa and 500°C enters a steady-flow turbine. The steam expands in the turbine while doing work until the pressure is 1000 kPa. When the pressure is 1000 kPa, 10 percent of while doing work until the pressure is 1000 kPa....
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- Spring '11
- Mechanical Engineering