In this paper, an experimental study is presented to investigate the effect of improved heat and mass transfer by using lenses and reflector on the solar still's thermodynamic processes. This study used two identical solar stills with the basin area of 1 m²: one is conventional solar still (SS) and the other one is a new solar still (NSS) equipped with lenses and mirror. The experimental results showed that the average Nusselt and Grashof numbers inside NSS cavity were enhanced by about 50% and 125% respectively, compared to SS. The maximum output per hour of NSS was 0.437 L/(m²·hr), and a new thermal model for convective mass transfer in solar still was proposed and established, and the modified values of C and n for Nu = C(GrPr)ⁿ were proposed as C = 0.9, n = 0.175 for 4.65 × 10⁷ < Gr < 3.07 × 10⁸. The agreement between the correlations and experimental results was fairly good with an error of about 10%. However, there were deviations between theoretical values and experimental values for Dunkle Model (base on C = 0.075, n = 1/3), and Kumar & Tiwari Model (base on C = 0.0322, n = 0.4114). The maximum value of evaporative heat transfer coefficient predicted by Kumar & Tiwari Model was 218.51% higher than that of the new thermal model in this research. The maximum value of evaporative heat transfer coefficient predicted by Dunkle Model was 137.33% higher than that of the new thermal model. After the performance assessment, it was found that NSS is more effective than the conventional type, and the price of 1 L of fresh water equals 0.305 RMB for this kind solar water recovery device.

在本文中，进行了一项实验研究，以研究通过使用透镜和反射镜改善的传热和传质对太阳蒸馏器热力学过程的影响。这项研究使用了两个相同的，面积为1 m ^2的太阳蒸馏器：一个是常规的太阳蒸馏器（SS），另一个是装有透镜和镜子的新型太阳蒸馏器（NSS）。实验结果表明，与SS相比，NSS腔内的平均Nusselt和Grashof数分别提高了约50％和125％。NSS的最大每小时产量为0.437 L /（m ² ·hr），并提出并建立了一个新的用于对流式传热的热模型，其对Nu  = C（GrPr）的C和n的修正值提议ⁿ为C = 0.9，对于4.65×10 ⁷  <  Gr  <3.07×10 ⁸，n = 0.175。相关性和实验结果之间的一致性相当好，误差约为10％。但是，Dunkle模型（基于C = 0.075，n = 1/3）以及Kumar＆Tiwari模型（基于C = 0.0322，n = 0.4114）的理论值和实验值之间存在偏差。Kumar＆Tiwari模型预测的蒸发传热系数最大值比新的热模型高218.51％。Dunkle模型预测的蒸发传热系数最大值比新的热模型高137.33％。经过性能评估，发现NSS比常规型更有效，这种太阳能回收装置每1升淡水的价格等于0.305元人民币。