Chapter 8, Problem 8.46P

Consider an ideal gas-turbine cycle with the following details in Table 1. Table 1 No. of stages at compression No. of stages at expansion 2 2 Pressure ratio 3 T of air at compressor inlet T of air at turbine inlet 300 K 1200 K Analyse the back work ratio and compare the thermal efficiency of the cycle for these two cases: i. no regenerator is used ii. a regenerator is used with 75 percent effectiveness

How can we increase the efficiency of the Rankine cycle? Discuss one method where the changes to be done in the ideal Rankine cycle for the sake of efficiency enhancement. Show the changes in schematic and T-S diagram.

The pressure ratio of a simple air-powered Rayton cycle is 12. Air enters the compressor at 295K and turbine at 1020 K. Since the net power of the cycle is 32MW, a) If the isentropic efficiency of the compressor and the turbine are 95%, b) If they are 80%, calculate the circulating air flow rate. Constant specific heat at room temperature will be accepted.