Abstract Present research study shows the evacuated tubes coupled with solar still to enhance the yield. Basin area of 1-meter square taken for the experiments and 14 evacuated tubes have been used at a lower side of the still. Calcium stones as sensible heat storage material (SHSM) have also been utilized to enhance the yield in present work. Three modes of experiments have been performed namely conventional solar still (CSS), solar still with evacuated tubes (SSET) and solar still with evacuated tubes and calcium stones (SSETCS) during January to June 2019 at Patan District, Gujarat. Groundwater was taken as feed water in present experiments. It was examined that the average yield was enhanced by 113.52 % and 104.68 % by use of SSET and SSETCS. The payback time (PBT) also determined in current work, and it was 237 for SSETCS. At last, it was concluded that the calcium stones are good SHSM to reduce water quantity and accumulate the heat during the daytime.

中文翻译：

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带有真空管和钙石以提高产量的太阳能蒸馏器：一项实验研究

摘要 目前的研究表明，真空管与太阳能蒸馏器相结合可提高产量。实验取用1平方米的盆地面积，在蒸馏器的下侧使用了14根真空管。在目前的工作中，钙石作为显热储存材料 (SHSM) 也已被用于提高产量。2019 年 1 月至 2019 年 6 月，在古吉拉特邦帕坦区进行了三种实验模式，即传统太阳能蒸馏器 (CSS)、带真空管的太阳能蒸馏器 (SSET) 和带真空管和钙石的太阳能蒸馏器 (SSETCS)。本实验以地下水为给水。经检验，使用SSET和SSETCS，平均收率分别提高了113.52%和104.68%。投资回收期（PBT）也在当前工作中确定，SSETCS为237。最后，