What is the efficiency? Consider the design of a high pressure ratio, single-shaft cycle with reheat at

What is the efficiency?   

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Consider the design of a high pressure ratio, single-shaft cycle with reheat at some point in the expansion when used either as a separate unit, or as part of a combined cycle. The power required is 240 MW at 288 K and 1-01 bar. • Compressor pressure ratio: • Polytropic efficiency (compressor and turbines): 0.89 • Turbine inlet temperature (both turbines): • Ap/paz (1st combustor): • Ap/pos (2nd combustor): • Exhaust pressure: 30 1525K 0.02 0.04 1.02 bar The plant is shown in Figure. A heat exchanger is not used because it would result in an exhaust temperature that would be too low for use with a high efficiency steam cycle. Reheat charmber Fuel Fuel HP turb. LP turb. FIG. 2.19 Reheat cycle Consider the design of a high pressure ratio, single-shaft cycle with reheat at some point in the expansion when used either as a separate unit, or as part of a combined cycle. The power required is 240 MW at 288 K and 1-01 bar. • Compressor pressure ratio: • Polytropic efficiency (compressor and turbines): 0.89 • Turbine inlet temperature (both turbines): • Ap/paz (1st combustor): • Ap/pos (2nd combustor): • Exhaust pressure: 30 1525K 0.02 0.04 1.02 bar The plant is shown in Figure. A heat exchanger is not used because it would result in an exhaust temperature that would be too low for use with a high efficiency steam cycle. Reheat charmber Fuel Fuel HP turb. LP turb. FIG. 2.19 Reheat cycle