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An increase in pump inlet temperature increases the exergy efficiency and the heating load of the system, while also resulting in a slight decrease in the cooling load of the system. This multigeneration system exhibits lower CO2 emissions than the more conventional power generation and CHP systems. The optimization results show that ORC turbine inlet pressure, ORC turbine inlet temperature, evaporator pinch point temperature difference, ORC turbine isentropic efficiency, and ORC pump isentropic efficiency 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. Other concluding remarks follow: i. An increase in biomass flow rate leads to a decrease in system exergy efficiency. ii. Increase in turbine inlet temperature and turbine inlet pressure result in increases in exergy efficiency and total cost rate of the system. 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. iii. An increase in pinch point temperature results in a decrease in system exergy efficiency and, when other design parameters are fixed, results in a decrease in heat transfer area for the evaporator. This is why the total cost rate of the system decreases. System III: Integrated OTEC-based multigeneration The comprehensive thermodynamic modelling and exergy and exergoeconomic analyses of this proposed multigeneration system for cooling, electricity generation, hydrogen and fresh water production has, as with the preceding systems, provided useful insights. System performance is notably affected by warm surface mass flow rate, solar radiation intensity, condenser temperature, PV/T collector length, PV/T collector width, PV/T inlet air mass flow rate and evaporator pinch point temperature difference (PP). Both exergy destruction and the dimensionless exergy destruction ratio are higher in solar collectors than in other components, suggesting that it would be worthwhile to focus efforts on improving this component. 219PDF Image | Energy Systems for Multigeneration Purposes
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