全被动聚光式太阳能蒸馏器的性能研究

The Performance Study of Fully Passive Concentrated Solar Distillation

本文提出了一种全被动聚光式太阳能蒸馏器。它不包含单独的集热器,而是集聚光和集热过程于一体,在嵌入到土壤里的蒸馏器中进行海水淡化.本文通过分析该蒸馏器的几何光学特性,得到了聚光器的最优化结构,并得出结论:在低纬度地方,绝大部分太阳光入射角度下装置的接收率大于95%。另外,本文通过分析蒸馏器内部的传热传质过程,得到了装置产水量在稳态条件下随太阳辐照度变化的曲线。理论计算结果表明,在辐照度为800 W·m^(-2)的稳定光照下,装置单位蒸发而积产水速率为0.2475 g·m^(-2)·s^(-1),产水效率约为45.5%。

A kind of fully passive concentrated solar distillation is presented.The distillation contains no heat collector and combines concentrating with heating process.The desalination process occurs in the distillation which is under the soil.The best optimized structure is got via the geometrical optics analysis of the distillation.It is concluded that the receiving rate of the distillation is higher than 95% under most sunlight with various angles at low latitudes.In addition,the water production curve of the device in the stable condition is calculated by analyzing the heat and mass transfer process in the distillation.The theoretical calculation result shows that the water production rate per unit evaporation area of the device is 0.2475 g.m-2.s-1 and the water production efficiency is 45.5% under the condition of 800 W.m-2 stable sunlight.