Air enters the compressor of an air-standard regenerative

Chapter 9, Problem 9.83

(choose chapter or problem)

Air enters the compressor of an air-standard regenerative gas turbine at \(p_{1}=14.7 \mathrm{lbf} / \mathrm{in} .{ }^{2}, T_{1}=530^{\circ} \mathrm{R}\) with a mass flow rate of 90,000 lb/h. The compressor pressure ratio is 10, the turbine inlet temperature is \(2200^{\circ} \mathrm{R}\), and the regenerator effectiveness is 80%. Determine the thermal efficiency and net power developed, in hp, for each of the following configurations that build on Problem 9.67(c).

(a) Introduce two-stage compression with intercooling between the compressor stages at a pressure of \(50 \mathrm{lbf} / \mathrm{in}^{2}\) Each compressor stage has an isentropic efficiency of 84% and the temperature of the air entering the second stage is \(530^{\circ} \mathrm{R}\). The isentropic turbine efficiency is 88%.

(b) Introduce two-stage expansion with reheat between the turbine stages at a pressure of \(50 \mathrm{lbf} / \mathrm{in}^{2}\) Each turbine stage has an isentropic efficiency of 88% and the temperature of the air entering the second stage is \(2000^{\circ} \mathrm{R}\). The isentropic compressor efficiency is 84%.