• Vol 9, No 2 (2018)
  • Electrical, Electronics, and Computer Engineering

A New Cascade Solar Desalination System with Integrated Thermosyphons

Mukhsinun Hadi Kusuma, Nandy Putra, Rizky Esa Respati


Cite this article as:
Kusuma, M.H., Putra, N., Respati, R.E., 2018. A New Cascade Solar Desalination System with Integrated Thermosyphons. International Journal of Technology. Volume 9(2), pp.297-306
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Mukhsinun Hadi Kusuma - Heat Transfer Laboratory, Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok 16424, Indonesia
- Centre for Nuclear Reactor Technology and Safety, National Nuclear Ene
Nandy Putra Heat Transfer Laboratory, Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok 16424, Indonesia
Rizky Esa Respati Heat Transfer Laboratory, Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok 16424, Indonesia
Email to Corresponding Author

Abstract
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Current cascade solar desalination systems can convert sea water into fresh water, but they can only produce small quantities. To produce more fresh water, there is a solution that can be applied, i.e. modification of the existing desalination system by adding thermosyphons. The objective of this research is to design a cascade solar desalination system with integrated thermosyphons and to establish its ability to produce fresh water. The experimental study was conducted by adding an aluminum absorber plate as a heat absorber in the upper tub, and nine copper thermosyphons with each length of 60 cm in the bottom of the tub. Thermosyphons with an inclination angle of 15° were used as a solar energy absorber and heat enhancer for sea water. The experiment was performed with varying sea water flow rates of 3600, 7200, and 10800 mL/h, and levels of sea water in the upper tub of 2, 3, and 4 cm. To compare the amount of fresh water obtained from the utilization of the thermosyphons, we also used the cascade solar desalination system without the thermosyphons. The results show that the cascade solar desalination system with integrated thermosyphons was able to produce an average amount of fresh water of 38.6 mL/h, with an average daily thermal efficiency of 18.78%. On the other hand, the same system without the thermosyphons produced on average 9.9 mL/h of fresh water, with an average daily thermal efficiency of 8%. The results indicate that the use of thermosyphons in the cascade solar desalination system can increase fresh water productivity by up to 3.89 times, and increase the thermal efficiency of the system by up to 2.35 times.

Cascade solar desalination; Heat pipe; Solar energy; Thermosyphon

Conclusion

An experimental investigation into a cascade solar desalination system with and without integrated thermosyphons has been conducted. The average fresh water productivity of the system with thermosyphons with varying mass flow rates and levels of sea water was 38.62 ml/h, with an average daily thermal efficiency of 18.78%. On the other hand, the average fresh water productivity of the system without thermosyphons was 9.93 ml/h, with an average daily thermal efficiency of 8%. The comparison results which were obtained show that the system with integrated thermosyphons was able to increase the solar heat transfer to the desalination system, increased fresh water productivity by up to 3.89 times, and increased thermal efficiency by up to 2.35 times. The addition of the thermosyphons as a passive cooling device had a significant effect in increasing the evaporation of sea water in the system; therefore, it increased the amount of heat required by sea water to condense into fresh water.

Acknowledgement

The authors would like to thank the DRPM Universitas Indonesia for funding this research through the “PITTA 2017” scheme No. 816/UN2.R3.1/HKP.05.00/2017.

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