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Additional specific conclusions follow: An increase in warm surface mass flow rate results in a decrease in the exergy efficiency of the system due to an increase in energy input, while at the same time increasing the net power output of the system. An increase in solar radiation intensity increases the exergy efficiency of the integrated multigeneration system. This is due to the fact that an increase in solar intensity leads to an increase in the temperature of the warm surface. The higher the warm surface temperature, the higher the energy input to the OTEC evaporator, which leads to an increase in the turbine work and finally results in an increase in the system's exergy efficiency. An increase in condenser temperature results in a decrease in both exergy efficiency and net power output of the integrated system. An increase in pinch point temperature results in a decrease in exergy efficiency and an increase in total exergy destruction rate. Multi-objective optimization showed that OTEC evaporator pinch point temperature difference, OTEC turbine isentropic efficiency, pump isentropic efficiency, absorption chiller evaporator temperature, PV/T inlet air mass flow rate, PV/T collector length, PV/T collector width and OTEC condenser temperature 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. Increase in PV/T collector length, turbine isentropic efficiency, pump isentropic efficiency, absorption chiller evaporator temperature and PV/T collector inlet air mass flow rate result in increased exergy efficiency and total cost rate of the system. ii. An increase in pinch point temperature results in a decrease in system exergy efficiency and, when other design parameters are fixed, also results in a decrease in heat transfer area for the evaporator, finally resulting in a decrease in the total cost rate of the system. 220PDF Image | Energy Systems for Multigeneration Purposes
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