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 each of three working fluids—propane,
Refrigerant 22, and Refrigerant 134a—specify workable ranges for p8, turbine inlet pressure, and T8, turbine inlet
temperature; also determine turbine exit pressure p9. For each working fluid, investigate the influence on net
combined-cycle electricity production and on combined-cycle thermal efficiency of varying p8, T8, and
compressor pressure ratio. Identify the bottoming working fluid and operating conditions with greatest net
combined-cycle electricity production. Repeat for greatest combined-cycle thermal efficiency. Apply engineering
modelling compatible with that used in the text for Rankine cycles and air-standard analysis of gas turbines.
Present your analyses, results, and recommendations in a technical article adhering to ASME standards with at
least three references.

 

nc = 85% n = 85% WGTC Gas turbine cycle Compressor Turbine T = 300 K P = 100 kPa 2 nreg = 80% Amm Regenerator mmm gin 7 4 T4=1200 K Combustor 8 P8, T8 Evaporator Organic Rankine cycle T = T8 +20 K P7=P1 11 Pump np = 85% W P 5 ngen = 95% Generator nt = 85% WORC ngen = 95% Turbine Generator 10 Saturated liquid 9 P9 Condenser Qout = 100 kW