The limit production of freshwater is considered the main problem of solar still. So, the objective of this work is studying the performance of single slope solar still coupled with phase change materials as a thermal storage unit and its effect on the still productivity. In view of this, different cases are considered namely, Case 1: solar still without phase change material (conventional solar still), Case 2: solar still coupled only with phase change material attached to the still base, Case 3: solar still with hollow cylindrical pin fins imbeded in the phase change material, case 4: solar still with phase change material and steel wool fibers in the still basin and case 5: solar still with only steel wool fibers in the still basin. The performance of the solar still for the five cases is experimentally evaluated and compared to each other’s under the same climate conditions of New Borg El-Arab City, Egypt (Longitude/Latitude: E 029°42′/N 30°55′). The results revealed that the presence of phase change material negatively affects the daytime freshwater productivity with a significant increment in the overall freshwater yield of the still. Also, solar still with phase change material-based pin finned (Case 3) achieves the best thermal performance compared to conventional still (Case 1) and solar still with phase change material (Case 2). It is perceived that the total daily cumulative yield of distillated water of Case 3 is higher than those of case 1 and case 2 by 17 and 7 %, respectively. Additionally, placing steel wool fibers in the basin accompanied with phase change material significantly enhances the daytime freshwater productivity with a considerable reduction in overnight productivity and an increase of the overall day productivity. Moreover, using steel wool fibers in the basin with a phase change material based solar still (case 4) enhances the total daytime freshwater productivity by 14% with a drop in the overnight productivity by 80%, compared to case 2. Among all tested configurations, case 5 achieves the highest accumulated daily freshwater productivity (approximately 25 % an enhancement in the daily productivity compared to case 1) and thermal efficiency with minimum cost.

淡水的限量生产被认为是太阳能蒸馏器的主要问题。因此，这项工作的目的是研究仍结合相变材料作为储热单元的单斜太阳能电池的性能及其对静态生产率的影响。鉴于此，考虑了不同的情况，即情况1：没有相变材料的太阳能蒸馏器（传统的太阳能蒸馏器），情况2：仅具有附着到静止底座的相变材料的太阳能蒸馏器，情况3：具有空心的太阳能蒸馏器圆柱形针状鳍片嵌入相变材料中，情况4：太阳能蒸馏瓶，在蒸馏池中装有相变材料和钢丝棉，而情况5：太阳能蒸馏器，在蒸馏池中只有钢丝棉纤维。通过实验评估了这5种情况下的太阳能静止器的性能，并在埃及新博格·阿拉伯城（经度/纬度：E 029°42′/ N 30°55′）的相同气候条件下彼此进行了比较。结果表明，相变材料的存在对白天的淡水生产率产生了负面影响，并大大提高了蒸馏水的总淡水产量。此外，相变材料基针状翅片的太阳能蒸馏器（案例3）与常规蒸馏器（案例1）和相变材料的太阳能蒸馏器（案例2）相比，具有最佳的热性能。可以看出，情况3的蒸馏水每日总累积产量分别比情况1和情况2高17％和7％。此外，将钢丝绒纤维与相变材料一起放入水盆中，可显着提高白天的淡水生产率，大大减少了夜间生产率，并提高了整个白天的生产率。此外，与案例2相比，在盆地中使用钢丝棉纤维与相变材料基太阳能蒸馏水（案例4）相比，白天的总淡水生产率提高了14％，过夜生产率下降了80％。 ，案例5以最高的成本实现了最高的每日累积淡水生产率（与案例1相比，每日生产率提高了约25％）和热效率。