联合海水淡化的太阳能烟囱发电系统非稳态传热研究

Unsteady State Heat Transfer of Solar Chimney Power Generation System Associated With Seawater Desalination

提出联合海水淡化的太阳能烟囱发电综合系统的设计方案,给出描述综合系统非稳态传热问题的数学物理模型,搭建综合系统试验装置,并在实际天气条件下进行测试。结果表明:计算结果和试验结果吻合较好;海水厚度对综合系统运行特性有重要影响,单从获取淡水产量来说,在保证足够的水量以供蒸发又不至于在水面上形成反射盐层的前提下,水层应是越浅越好;单从可得到的理论发电功率来说,水层越浅越好;单从是否有利调整系统昼夜电力输出峰谷差,改善系统连续稳定运行来说,水层越厚越好。系统运行平稳时,海水厚度对太阳能日利用率的影响不大。

A design scheme of the solar chimney power generation system associated with seawater desalination was proposed.Meanwhile,mathematical models to describe the mechanism of unsteady state heat transfer of the integrated system were established.Additionally,a set of test devices for the integrated system were developed and it was tested in actual weather conditions.Results show that the calculated results agree well with the experimental results and the water thickness has a major effect on the integrated system operating characteristics.In terms of fresh water production,under conditions of ensuring adequate water for evaporation as well as not forming reflective salt layer on the water surface.the shallower the water level,the better,while in terms of available theoretical generated electrical power,the shallower the water level,the better.However,in terms of the benefits of adjusting the peak and valley of electrical power output difference between day and night,and improving the continuous and stable operation of the integrated system,the thicker the water level,the better.Results also show that when the system is stable,the thickness of water has little effect on the daily utilization rate of solar energy.