Abstract
In order to reasonably use solar energy to solve problems such as land desertification and soil salinization in Southern Xinjiang, this paper proposes a system combining photothermal and flash evaporation technologies, which use local saline water for desalination treatment to achieve secondary utilization of water resources. Firstly, we introduce the whole system of the photovoltaic desalination plant. As an important heat-collecting element of the system, the solar tube is the key to whether this plant can work efficiently. Then, we carry out the detection and theoretical derivation of data along the tube. We establish a two-phase flow model of saline water in the tube, considering convective heat transfer, and define the formula of the heat collecting efficiency factor. Finally, based on iterative calculation, the temperature trend of the tube and the change law of the two-phase flow are obtained, and the ecological and economic benefits and energy efficiency of the system are analyzed.
Highlights
Southern Xinjiang is an area in China that is blessed with abundant solar energy, but has the issue of severe saline alkaline water pollution
As shown by the annual radiation of the Aksu meteorological station (Figure 1), there is 5467 MJ/m2 solar radiation per year on average. (There are many monitoring stations in various places, but the Aksu meteorological station is in the Tarim Basin and located in an area that can best represent the local solar radiation)
Based on the analysis method of Duffie and Beckman [27], we propose an improved model to meet the requirements of the coaxial effect and two-phase flow research of solar vacuum tubes
Summary
Southern Xinjiang is an area in China that is blessed with abundant solar energy, but has the issue of severe saline alkaline water pollution. It is of great significance to make full use of the available solar energy to solve water pollution problems. The Xinjiang region has the characteristics of long days and sufficient solar radiation. As shown by the annual radiation of the Aksu meteorological station (Figure 1), there is 5467 MJ/m2 solar radiation per year on average. (There are many monitoring stations in various places, but the Aksu meteorological station is in the Tarim Basin and located in an area that can best represent the local solar radiation).
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