DEVELOPMENT AND EVALUATION OF THE EFFECTIVENESS OF NEW DESIGNS OF SOLAR DESALINATION POOLS FOR THE PRODUCTION OF FRESH WATER IN HOT CLIMATES
Syrlybekkyzy S. Zhidebayeva A. Aitimova A. Baimbetov D. Taizhanova L.
2024National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2024#2024Issue 4179 - 195 pp.
The emergency for fresh water production is especially high in hot dry climates without any sources of drinking water but with abundance of sea and underground water. The problem solution is water desalination with efficient solar powered water treatment plants. This article proposes a new modification of a basin made of the thin finned corrugation with the 43 °angle inclined sides equal to the region latitude, what provides their stronger heating. The experiments were carried out in hot climate of Aktau city (43° 49’N 51°1’E). The work outcomes can be useful for the regions with drinking water scarcity. To define the level of the corrugated basin efficiency, 2 versions (SS-1, SS-2) of experiments were carried out on a 2-slope distiller completed with 2 basins. In SS-1, the basin-2 heated air. By 15:00, the basin-2 heated up to 98.5 °С, and acrylic cover above heated up to 101.6 °С, what led to its “deformation”. By 12.00am, the temperature differential among the glass 40.7 °С, the air-water mixture 57.3°С, and the basin-1 61.1 °С, was 16.6 °С and 20.4 °С. That resulted from wind increase up to 5.9 m/s. The large temperature differential contributed to condensate yield increase from 0.128 kg. at 11 o’clock to 0.293 kg at 12 o’clock. The throughput capability of the basin-1 per day equaled to 2.094 kg. The basin-2 input to the SS-1 performance was only the thermal effect. In SS-2, the basin-2 was used as a regular basin. The plexiglass temperature was lower than the water and the basin-2 temperatures. The temperature differential between the glass and air-water mixture at 10:00am was 20 °С, at 12:00am it was 30.6 °С, and the value of 30.6 °С was recorded at 3:00pm. The thermal differential between the glass and the air-water mixture provided the highest condensate yield of 1.114 kg. at 3.00pm. The condensate yield from the basins via SS-2, resulted in 8.72 kg., including 3.5 kg from basin-1, what is 1.7 times more than from basin-1 via SS-1. The experimental results are consistent with the equations coming from the models obtained (by Clark J.A. and Dunkle R.V.). Tcondensation≠ Tevaporationis irreversible process. When the basins heat, the heat is consumed, when the glass cools down, the heat is given off. Heat losses minimized at the account of the “gap” and positive exergy is provided. The stills throughput capability can be larger by increasing the basins area, reducing the water layer thickness and regulating the flowrate of the desalinated water.
2 basins , air gap; brackish water , air heater , finned and corrugated basin
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Sh.Yessenov Caspian University of Technology and Engineering, Aktau, Kazakhstan
Department of Ecology and Geology, Caspian University of Technology and Engineering named after Sh. Yessenova, Aktau, Kazakhstan
Department of Energy and Automation, Caspian University of Technology and Engineering named after Sh. Yessenova, Aktau, Kazakhstan
Sh.Yessenov Caspian University of Technology and Engineering
Department of Ecology and Geology
Department of Energy and Automation
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