The figure below shows a combined cycle formed by a gas turbine and an organic Rankine bottoming cycle. Steady-state operating data are labeled on the figure. Owing to internal irreversibilities, the generator electricity output is 95% of the input shaft power. The regenerator preheats air entering the combustor. In the evaporator, hot exhaust gas from the regenerator vaporizes the bottoming cycle working fluid. For propane, specify workable ranges for p8, turbine inlet pressure, and T8, turbine inlet temperature; also determine turbine exit pressure p9.

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nc = 85% Compressor T₁ = 300 K P₁ = 100 kPa 2 6 www 7 mreg = 80% www. Regenerator trimm Evaporator T₁=Tg+20 K P₁ = P₁ Gas turbine cycle www 11 3 gin mp = 85% Combustor T4 = 1200 K Organic Rankine cycle Pump P mt=85% 8 P8, Tg 10 Turbine 4 5 mt=85% Turbine 9+ P9 Condenser Saturated liquid W GTC ngen = 95% Generator WORC ngen = 95% Generator Qout W₂ = 100 kW nc = 85% Compressor T₁ = 300 K P₁ = 100 kPa 2 6 www 7 mreg = 80% www. Regenerator trimm Evaporator T₁=Tg+20 K P₁ = P₁ Gas turbine cycle www 11 3 gin mp = 85% Combustor T4 = 1200 K Organic Rankine cycle Pump P mt=85% 8 P8, Tg 10 Turbine 4 5 mt=85% Turbine 9+ P9 Condenser Saturated liquid W GTC ngen = 95% Generator WORC ngen = 95% Generator Qout W₂ = 100 kW

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