Prepare a memorandum including the derivation of part (a),the plots of part (b), and the…

Prepare a memorandum including the derivation of part (a),

the plots of part (b), and the conclusions of part (c) relating

to actual engine performance.

9.9D Figure P9.9D shows a combined cycle formed by a gas

turbine and an organic Rankine bottoming cycle. Steadystate 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 modeling 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.


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