Elgendi Mahmoud, AlHamad Issah M, Albedwawi Wadimah, Alhammadi Reem, Alzeyoudi Fatmah, Alrashdi Mouza
Department of Mechanical and Aerospace Engineering, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates.
Department of Mechanical Power Engineering and Energy, Faculty of Engineering, Minia University, Minia, Egypt.
Environ Sci Pollut Res Int. 2023 Feb;30(10):25892-25902. doi: 10.1007/s11356-022-23957-y. Epub 2022 Nov 9.
Premature drainage increases the amount of used saline water, increasing the transportation and purification costs of saline water. On the other hand, postmature drainage increases the salt concentration of the brine, which deteriorates the solar still performance and may cause salt perceptions. The present study aims to identify appropriate brine conditions for the drainage process and propose a layout for an automatic drainage process. Therefore, the effect of brine's salt concentration and temperature on a pyramid solar still's productivity is being investigated. Seven salt concentrations were investigated, and the brine and metrological conditions were measured. The results show that the higher the salt concentration, the lower the solar still productivity. The daily yield of solar still ranges 5778-4061 g/md for feedwater salinity 0.15-134 ppt, respectively. Therefore, the novelty or recommendation of this study is that if the brine salinity reaches 127 ppt, the brine should be drained to avoid the precipitate, regardless of the stored thermal energy in the brine. Also, if the brine salinity reaches 118 ppt and the difference between its temperature and ambient temperature is about 1℃, the brine should be drained.
过早排水会增加盐水的使用量，从而增加盐水的运输和净化成本。另一方面，过晚排水会增加卤水的盐浓度，这会降低太阳能蒸馏器的性能，并可能导致盐分析出。本研究旨在确定排水过程中合适的卤水条件，并提出一种自动排水过程的布局。因此，正在研究卤水的盐浓度和温度对金字塔形太阳能蒸馏器生产率的影响。研究了七种盐浓度，并测量了卤水和气象条件。结果表明，盐浓度越高，太阳能蒸馏器的生产率越低。对于进水盐度分别为0.15 - 134 ppt的情况，太阳能蒸馏器的日产量范围为5778 - 4061 g/m²·d。因此，本研究的新颖之处或建议是，如果卤水盐度达到127 ppt，无论卤水中储存的热能如何，都应排出卤水以避免沉淀。此外，如果卤水盐度达到118 ppt且其温度与环境温度之差约为1℃，则应排出卤水。
