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Design of Improved Multi Effect Desalination (MED)Plant to Increase the Heat Transfer and Reduce the Scaling

Afshoon, Golnaz | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56043 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Avami, Akram
  7. Abstract:
  8. There are different technologies for supplying water from alternative sources that meet different needs. In relation to thermal technologies such as multi-effect distillation, the highest water quality is obtained, there is no limit on the concentration of the incoming water, and there is the least need for maintenance. On the other hand, thermal technologies consume higher energy than membrane technologies. In this process, the better the heat transfer, the number of steps can be increased, and this means the production of more distilled water for the same amount of thermal energy. The distilled water layer on the surface of the heat exchanger has a high thermal resistance compared to the metal used in the exchanger, and by reducing its thickness, heat transfer can be improved. In this research, by removing the surface water layer experimentally, heat transfer has been improved by 30%. According to the price of fuel and water in each geographical area, different results can be obtained. In Iran, due to the higher price of distilled water, the scenario of increasing water production is economically justified, and in countries where fuel prices are in line with the free market, reducing energy consumption is more justified. The shortest investment return time for the scenario is for 3 years. In addition to the condensation side, the surface water layer removal system is also used in the water evaporation side and prevents the formation of sediment and keeps the heat transfer equipment in its optimal state. It is worth mentioning that this system is also used in other cases where phase change occurs. Therefore, the wide application of this method in the industry and its small consumption can improve the heat transfer on both sides of the exchanger
  9. Keywords:
  10. Energy Consumption ; Multi-Effect Desalination (MED) ; Improving Heat Transfer ; Distilled Water Layer Thickness ; Reducing Sediment ; Thermal Technologies

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