Problem
1. A piston/cylinder contains ethane gas initially at 500 kPa, 100 L, and at ambient temperature 0oC. The piston is moved, compressing the ethane until it is at 20oC with a quality of 50%. The work required is 25% more than would have been needed for a reversible polytropic process between the same initial and final states. Calculate the heat transfer and the net entropy change for the process.
2. Carbon dioxide gas enters a turbine at 5 MPa, 100oC, and exits at 1 MPa. If the isentropic ef- ficiency of the turbine is 75%, determine the exit temperature and the second-law efficiency, using the generalized charts.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.