Abstract
In this work, an innovative trigeneration system integrating the combined nano filtration - multi effect desalination system to absorption chiller for cooling, steam Rankine cycle for power output, parabolic trough collector, and auxiliary natural gas-fired heater for heat input. Energy, exergoeconomic, and environmental models are developed for the proposed plant. Comparison between systems with/without nanofiltration is conducted. Then, a parametric study is exhibited and discussed. Finally, multi-objective optimization process is carried out using genetic algorithm to achieve minimum investment cost rate and maximum exergetic efficiency. Results showed that the nanofiltration unit addition decreases the overall plant exergy destruction, investment cost rate and annual fuel consumption by 12.11%, 6.88% and 12.1% respectively. Moreover, the annual CO 2 emissions can be enhanced by about 9% with the heating steam temperature of the desalination unit. On the other hand, parametric study revealed that increasing the absorption generator temperature and the desalination unit number of evaporators is recommended from the energetic exegetic, and exergoeconomic points of view. While the plant investment cost per hour is negatively affected by number of evaporators increase. The annual CO 2 emissions avoided can be enhanced by about 9% with the NF-MED heating steam temperature increase. Optimization process showed that the optimal operation conditions can decrease the total product cost rates by 2.94% and increase the exergy efficiency by 5.26% compared to the base system.
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