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In Figs. 6.35-6.38, we observe that the HRSG low and high pressures (Fig. 6.36a and Fig. 6.36b), the HRSG high and low pinch point temperatures (Fig. 6.36c and Fig. 6.36d), the steam turbine and pump isentropic efficiencies (Fig. 6.37a and Fig. 6.37b), the absorption chiller evaporator temperature (Fig. 6.37c), the condenser pressure (Fig. 6.37d), the ORC turbine inlet pressure (Fig. 6.38a) and the ORC evaporator Pressure (Fig. 6.38c) have scattered distributions in their allowable domains, suggesting that these parameters have important effects on the trade- off between exergy efficiency and total cost rate. Design parameters selected with their maximum values indicate that they do not exhibit a conflict between two objective functions, indicating that increasing those design parameters leads to an improvement of both objective functions. 6.2.4.4.2 Sensitivity analysis In order to have a better understanding of the multi-objective optimization, a comprehensive sensitivity analysis is performed. The effects of each design parameters for point A-D on both objective functions are investigated. Fig. 6.39a, shows the effects of compressor isentropic efficiency on system exergy efficiency and total cost rate of the system. As seen in this figure, an increase in compressor isentropic efficiency has positive effect on both objective functions. An increase in compressor isentropic efficiency leads to a decrease in compressor required work which results in less fuel burnt in the combustion chamber. The lower the fuel use the higher the exergy efficiency and the lower the cost. Fig. 6.39b also shows that an increase in gas turbine isentropic efficiency has a positive effect on both objective functions. The reason is same as for compressor isentropic efficiency. Fig. 6.39c represents the effect of GTIT on both objective functions, showing that this parameter has positive effect on both objective functions. The maximum value for the GTIT is selected based on the evolutionary algorithm. The higher the GTIT, the higher the achieved exergy efficiency will be, since one of the objective functions is supposed to be maximized. As shown in this figure, an increase in GTIT has positive effect on both objective functions. This is why, in Fig. 6.35c, points reach at their maximum value for GTIT. Fig. 6.39d shows the effect of compressor pressure ratio on both objective functions. An increase in compressor pressure ratio leads to an increase in exergy efficiency and decrease in total cost rate of the system. 149PDF Image | Energy Systems for Multigeneration Purposes
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