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Analysis of a new design of a multi-stage flash–mechanical vapor compression desalination process

In this work, a new design of a Multi Stage Flash-M echanical Vapor Compression (MSF-MVC) desalination process is investigated. The analysis of the proposed MSFMVC system is performed based on the energy, exergy and thermoeconomic methodologies. The considered system is investigate d under different operating conditions using a developed Visual Design and Simulation (VDS) software. To examine the performance of the proposed process, a comparison with the conventional MSF desalination process is performed. Thermoeconomic results show that, the best operatin g suction pressure is 8 kPa and the best top brine temperature is 110 °C. The effect of the stages number of the heat recovery section is investigated and the results sh ow that the low unit product cost is obtained at 20 stages. The effect of the temperatur e difference across the vent chamber is conducted and the results show that the lower un it product cost is 6 °C. Thermoeconomic analysis shows that the last stage ( vent chamber) has the highest value of the sum of capital and operation & mainten ance cost in addition to the exergy destruction cost. Also the last stage has higher re lative cost difference and lower exergetic efficiency. This in turn shows that a red uction in the exergy destruction within the vent chamber will reduce the unit produc t cost. The performance ratio of the proposed MSF-MVC system is 2.4 times the performance ratio of the conventional MSF process. The heat transfer area of the MSF-MVC system is 57 % higher than that of the conventional MSF. The exergetic efficiency o f the MSF-MVC system is 67 % higher than that of the MSF. The thermoeconomic results show that the unit product cost of MSF-MVC, under the specified conditions, is calculated by 2.0 $/m 3 and this value is 25 % less than that of the conventional MS F process.
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