Abstract
Abstract In the present study a comprehensive thermodynamic modeling and multi-objective exergoeconomic optimization of a new integrated SOFC-trigeneration system is carried out to determine the optimum decision parameters, accounting for exergetic, economic and environmental factors. Results of optimal designs are obtained as a set of multiple optimum solutions, called the Pareto optimal solutions. An example of decision-making is presented and a final optimal solution is introduced. Moreover, the optimized results are compared with the working data from a base case design of an actual system. This new approach shows that by selecting final optimum solution, the trigeneration unit cost of products reduced by 13.88% and exergy efficiency increased from 62.85% in the base case to 64.5% in the optimum case. Also, the optimization results demonstrate that fuel cost, exergy destruction cost and environmental impacts (CO 2 emissions cost) are reduced by 17.54%, 17.05% and 18.22% respectively; although these are achieved with 8.03% increase in the capital investment cost. Finally, sensitivity analysis is carried out to examine the effect of changes in the Pareto optimal solutions to the system economic parameters.
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