This work aims to improve the thermal and economic performance of stepped double slope solar still (SDSSS) that integrated with linen wicks (LWs) and carbon black nanoparticles (CBNs). The LWs and CBNs are used to increase the evaporation surface area and enhance heat transfer of basin saline water. The SDSSS with LWs and LWs with CBNs was evaluated, and compared with traditional solar still (TSS). The energy and exergy for convection and evaporation and exergy efficiency for different modifications are analyzed, and its costs are discussed. Results indicated that adding LWs and CBNs to SDSSS increased the freshwater productivity and energy efficiency by 80.57 and 110.5%, respectively, compared to TSS. The SDSSS fractional exergy of evaporation was the highest in the case of integrating LWs and CBNs with the solar still due to the high basin water temperature. This modification caused the highest exergy efficiency for SDSSS because of enhanced photo-thermal properties of CBNs, and heat storage characteristic of LWs. Economic analysis indicated that the total costs per liter of produced freshwater for SDSSS without any modifications, SDSSS with LWs, SDSSS with CBNs, and SDSSS with LWs and CBNs were lower than TSS by 13.73, 19.91, 23.83, and 47.22%, respectively.

这项工作旨在提高与亚麻芯（LWs）和炭黑纳米颗粒（CBNs）集成的阶梯式双斜率太阳能蒸馏器（SDSSS）的热经济性能。LW和CBN用于增加蒸发表面积并增强盆地盐水的热传递。对带有LW和带有CBN的LW的SDSSS进行了评估，并与传统的太阳能蒸馏器（TSS）进行了比较。分析了对流和蒸发的能量和（火用）能和不同修改的热能效率，并讨论了其成本。结果表明，与TSS相比，向SDSSS添加LW和CBN分别使淡水生产率和能源效率提高了80.57和110.5％。由于流域水温高，在将LWs和CBNs与太阳能仍然集成的情况下，蒸发的SDSSS分数能干是最高的。由于CBNs的光热性能增强以及LWs的储热特性，这种修改导致SDSSS的最高火用效率。经济分析表明，未作任何修改的SDSSS，含LW的SDSSS，含CBN的SDSSS和含LW和CBN的SDSSS的每升淡水总成本分别比TSS低13.73％，19.91、23.83和47.22％。