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From point A to point C in this table, both total cost rate of the system and exergy efficiencies increases. As previously stated, point A is preferred when total cost rate is a single objective function, and design point C when exergy efficiency is a single objective function. Design point B has better results for both objective functions. Other thermodynamic properties correctly confirm this trend. For instance, from point B to C, the total exergy destruction rate decreases when the exergy efficiency increases. In order to better understand the variations of all design parameters, the scattered distribution of the design parameters are shown in Figs. 6.96 to 6.98. In Figs. 6.96 to 6.98, it can be seen that the ORC turbine inlet pressure (Fig. 6.69c), the PV/T length (Fig. 6.96a), the pinch point temperature (Fig. 6.96c), the turbine isentropic efficiency (Fig. 6.96d), the pump isentropic efficiency (Fig. 6.97a), the condenser temperature (Fig.6.97c), the PV/T inlet air mass flow rate (6.97d) and the PV/T width (Fig. 6.98) 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. 6.4.3.4.2 Sensitivity analysis In order to have a better understanding of the multi-objective optimization, a comprehensive sensitivity analysis was performed. The effects of each design parameter for points A–C on both objective functions are investigated. Fig. 6.99 shows the effects of PV/T length on system exergy efficiency and total cost rate of the system. As seen in this figure, an increase in PV/T length has a negative effect on total cost rate, while an increase in this parameter results in an increase in the exergy efficiency of the system. An increase in PV/T length leads to an increase in collector electricity production and heat input to the single effect absorption chiller, resulting in an increase in the useful outputs of the system to increase the efficiency. On the other hand, an increase in this parameter correspondingly increases the purchase cost of the PV/T collector, which affects the total cost rate of the system. Since an increase in this parameter has both positive and negative effects on objective functions, its variation has a scattered distribution as shown in Fig. 6.96 a. 206PDF Image | Energy Systems for Multigeneration Purposes
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