Abstract In this paper, a modified pyramid-shaped solar still (MPSS) including a conventional pyramid-shaped solar still (CPSS) integrated with a heat pipe solar collector (HPSC) was fabricated and experimentally assessed in the outdoor conditions of Mashhad, Iran (latitude of 36°18 ' , longitude of 59°34 ' ). Two different working fluids (water and ethanol) were used at three different filling ratios (FRs). Results showed that using the HPSC increased the temperature difference between the glass cover and the basin water. Therefore, using the HPSC augmented the hourly and accumulated yield. The accumulated yield was escalated to 6970 and 3300 ml/m2 for the MPSS (with water as the working fluid at the FR of 40%) and the CPSS, respectively. Moreover, the HPSC increased exergy, although the instantaneous efficiency was rather invariant. Based on the experimental data the values of the total internal heat transfer coefficient have been calculated. Furthermore, the best performance of the MPSS was obtained with water as the working fluid at the FR of 40% whereas ethanol at the FR of 40% also showed a very good performance. Finally, the economic analysis revealed that the MPSS was economically reasonable and an estimated cost for 1 L of distillate was 0.0137 $ for the proposed MPSS.

中文翻译：

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以水和乙醇为工作流体对集成热管太阳能集热器的金字塔形太阳能蒸馏器性能影响的实验研究

摘要 在本文中，在伊朗马什哈德的室外条件下，制造了一种改进的金字塔形太阳能蒸馏器 (MPSS)，包括与热管太阳能集热器 (HPSC) 集成的传统金字塔形太阳能蒸馏器 (CPSS)。纬度 36°18'，经度 59°34'）。以三种不同的填充率 (FR) 使用两种不同的工作流体（水和乙醇）。结果表明，使用 HPSC 增加了玻璃盖和盆水之间的温差。因此，使用 HPSC 增加了每小时和累计产量。对于 MPSS（以水作为工作流体，FR 为 40%）和 CPSS，累积产量分别上升到 6970 和 3300 ml/m2。此外，HPSC 增加了火用，尽管瞬时效率相当不变。基于实验数据，计算了总内部传热系数的值。此外，MPSS 的最佳性能是在 FR 为 40% 时用水作为工作流体获得的，而乙醇在 40% FR 下也表现出非常好的性能。最后，经济分析表明 MPSS 在经济上是合理的，并且对于提议的 MPSS，1 L 馏出物的估计成本为 0.0137 美元。