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Design, Manufacture, and Investigation of the Desalination System Using Direct Absorption Solar Collector with Organic Colloids and External Condenser

Ebrahimpour, Benyamin | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54216 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. The use of nanofluids for direct absorption of solar irradiance to produce freshwater has received much attention. Water-based nanofluids include metals, metal oxides, and nanocarbon-based fluids, which increase collector efficiency. On the other hand, the production cost of nanofluids is high, and when discharging the brine after the desalination process, these nanofluids cause environmental issues. Therefore, water-based organic colloids of coffee, walnut shell, black tea, and madder have been studied to overcome these problems. To accurately measure the behavior of colloids, laboratory single slope solar still was used in laboratory conditions. Also, two single slope solar stills with the same equipment and environmental conditions have been used to compare the amount of fresh water produced by organic colloids in one system and water in another. According to the results, it is observed that the use of these colloids increases the absorption of solar radiation, which increases the rate of fluid evaporation. The highest daily efficiency of solar still containing organic colloids of walnut shell and coffee are equal to 44.21% and 40.3%, respectively. Finally, an economic study of these two colloids of coffee and walnut shell shows that the price of produced freshwater are 13.06 and 11.56 $/m3, respectively
  9. Keywords:
  10. Desalination ; Solar Still ; Solar Energy ; Direct Absorption Solar Collector (DASC) ; Organic Colloid

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