Abstract
An exergoeconomic analysis is reported of a geothermal-based combined system for electricity and freshwater in which a geothermal steam turbine is integrated with multi-effect desalination and reverse osmosis systems. The article includes an exergy analysis, an economic assessment and an exergoeconomic (i.e., exergy-based economic) evaluation. The specific exergy costing method is used for the analysis of the system to determine the effects of various design criteria on the cost rates and then to incorporate feasible improvements for enhanced cost effectiveness. The results of the exergoeconomic analysis can assist in the design, optimization and improvement of geothermal-based electricity-freshwater production combined systems. It is found that the exergoeconomic factors for the reverse osmosis, multi-effect desalination and steam turbine are high, all exceeding 85%. Thus, reducing the investment costs for these components is merited. This can be done by any of the following measures, among others: reducing heat transfer area in the multi-effect desalination system, using less expensive pumps and membranes in reverse osmosis, and lowering the expansion ratio, turbine inlet temperature and isentropic efficiency for the steam turbine.
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