Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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results in a decrease in heat transfer area for the evaporator. This is why the total cost rate of the system decreases. Figure 6.74: Effects of evaporator pinch point temperature on both objective functions. Since an increase in this parameter has positive and negative effects on both objective functions, the variation of this design parameter within its allowable range exhibits a scattered distribution as shown in Fig. 6.70a. Fig. 6.75 represents the effect of turbine isentropic efficiency (ηT) on both objective functions. An increase in ηT results in an increase in system exergy efficiency and increase in total cost of the system. Increasing this parameter results in an increase in the steam turbine power output, which directly leads to an increase in the exergy efficiency. It is also seen that increasing this parameter leads to an increase in steam turbine purchase and maintenance cost. Since an increase in this parameter has positive and negative effects on both objective functions, the variation of this design parameter within its allowable range exhibits a scattered distribution as shown in Fig. 6.70b. Fig. 6.76 shows that pump isentropic efficiency does not have a significant effect on both objective functions, as its purchase cost is small. Fig. 6.77c shows the variation of the objective function by changing the absorption chiller evaporator temperature. An increase in evaporator temperature results in an increase in cooling load of the absorption chiller and at a same time increase the cost of the chiller. 185

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