Consider the gas turbine system analyzed in Section 3.10.3. The system is modified to include a regenerator as shown in Figure P3.28. The regenerator is a counter flow heat exchanger and has an effectiveness of 0.65. The other operating parameters are the same as in Section 3.10.3 and have been repeated in Figure P3.28. For this modified gas turbine system determine,

a. The mass-based air-fuel ratio (AF)

b. The specific fuel consumption (kg/kWh)

c. The thermal efficiency of the system

d. The exergetic efficiency of the system

e. The exergy accounting of the fuel’s input exergy transfer rate to the system.
Construct a table similar to Table 3.8, adding a line for the exergy destruction rate in the regenerator.

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TABLE 3.8 Distribution of the Incoming Fuel Exergy in the Gas Turbine System kW % of Input 837.0 250.0 19.1 169.8 7.1 17.4 373.6 Exergy Rate Entering with the fuel Output of the gas turbine system Compressor destruction Combustion chamber destruction Gasifier turbine destruction Power turbine destruction Lost leaving the power turbine 29.9% 2.3% 20.3% 0.8% 2.1% 44.6%