The wear on a steam turbine could be decreased by raising the pressure at the turbine outlet so that the quality of the steam at the outlet is one. In the ideal Rankine cycle of Example 13.2 and Figure 13.12

χ = 0.9 at the turbine outlet. Keeping the p₊, T₊, and T₃ unchanged, determine p₋ and T₋ so that χ = 1 at ➃. Compare the efficiency and the power per cycle of the resulting cycle with the cycle of Example 13.2. To simplify the calculation, ignore the work done by the pump. Would you advise taking this step?

Transcribed Image Text:

700 P+ 600 о т. 500 p- 400 т. 300 4 6. (a) entropy [kJ/kg K] 3, т. 800 700 P+ 600 Tvap (P) 500 p- 400 т. 300 4 8. (b) entropy [kJ/kg K] temperature [K] temperature [K] 2. 2.