Regeneration, Reheat, and Compression with Intercooling For each of the following modifications of the cycle of part (c) of Problem 9.66, determine the thermal efficiency and net power developed, in horsepower.
(a) Introduce a two-stage turbine expansion with reheat between the stages at a constant pressure of 50 lbf/in.2 Each turbine stage has an isentropic efficiency of 88% and the temperature of the air entering the second stage is 2000°R.
(b) Introduce two-stage compression, with intercooling between the stages at a pressure of 50 lbf/in.2 Each compressor stage has an isentropic efficiency of 84% and the temperature of the air entering the second stage is 70°F.
(c) Introduce both compression with intercooling and reheat between turbine stages. Compression occurs in two stages, with intercooling to 70°F between the stages at 50 lbf/in.2
The turbine expansion also occurs in two stages, with reheat to 2000°R between the stages at 50 lbf/in.2 The isentropic efficiencies of the turbine and compressor stages are 88 and 84%, respectively.
Problem 9.66
An air-standard Brayton cycle has a compressor pressure ratio of 10. Air enters the compressor at p1 = 14.7 lbf/in.2, T1 = 70°F with a mass flow rate of 90,000 lb/h. The turbine inlet temperature is 2200°R. Calculate the thermal efficiency and the net power developed, in horsepower, if
(a) the turbine and compressor isentropic efficiencies are each 100%.
(b) the turbine and compressor isentropic efficiencies are 88 and 84%, respectively.
(c) the turbine and compressor isentropic efficiencies are 88 and 84%, respectively, and a regenerator with an effectiveness of 80% is incorporated.
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