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Transient and thermo-economic analysis of MED-MVC desalination system

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  • Elsayed, Mohamed L.
  • Mesalhy, Osama
  • Mohammed, Ramy H.
  • Chow, Louis C.

Abstract

An exergo-economic model is used to assess the performance of a multi-effect desalination plant integrated to a mechanical vapor compressor unit (MED-MVC) with a water production capacity of 1500 m3/day. The results show that the second law efficiency (ηII) is 2.8%. The MVC and evaporator units are responsible for about 39 and 52% of the total exergy destruction, respectively. The total water price (TWP) is 1.70 $/m3 when calculated using a simple conventional economic model and 1.63 $/m3 when calculated using an exergy-based cost model. Increasing the number of effects from 1 to 6 results in a 39% reduction in the specific power consumption (SPC), a 70% increase in ηII and a 24% decrease in TWP. A dynamic model is developed to investigate the effect of fluctuations of compressor work (W˙c) and inlet seawater temperature (Tsw) on the plant behavior and performance. The dynamic model results show that the disturbance in W˙c has a significant effect on the plant transient behavior and may cause the plant to cease operation while a disturbance in Tsw has only a moderate impact. Increasing Tsw above a certain value of the steady-state condition without proper control on the plant response could lead to evaporator dry out. In term of performance, a reduction in W˙c causes a decrease in the plant production capacity and SPC, while it increases the plant performance ratio (PR). On the other hand, a reduction in the inlet Tsw causes a reduction in the plant production capacity and PR and an increase in SPC for the same compressor work. Furthermore, a comparison between a MED-MVC system and a MED integrated to a thermal vapor compressor system (MED-TVC) reveals that the latter system is rather sensitive to the reduction in Tsw due to the presence of the condenser unit in the MED-TVC. The response of the MED-MVC system is slower than the MED-TVC which is due to the high thermal capacity of the preheaters for the feed in the MED-MVC.

Suggested Citation

  • Elsayed, Mohamed L. & Mesalhy, Osama & Mohammed, Ramy H. & Chow, Louis C., 2019. "Transient and thermo-economic analysis of MED-MVC desalination system," Energy, Elsevier, vol. 167(C), pages 283-296.
    • Handle: RePEc:eee:energy:v:167:y:2019:i:c:p:283-296
    DOI: 10.1016/j.energy.2018.10.145
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    References listed on IDEAS

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    1. Michael Castro & Myron Alcanzare & Eugene Esparcia & Joey Ocon, 2020. "A Comparative Techno-Economic Analysis of Different Desalination Technologies in Off-Grid Islands," Energies, MDPI, vol. 13(9), pages 1-25, May.
    2. Alharbi, Sattam & Elsayed, Mohamed L. & Chow, Louis C., 2020. "Exergoeconomic analysis and optimization of an integrated system of supercritical CO2 Brayton cycle and multi-effect desalination," Energy, Elsevier, vol. 197(C).
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