This present work is aimed to examine the effect of mass flow rate on distillate output and performance of a solar still in active mode. Outdoor experiments were conducted at the coastal town, Kakinada (16°93′N/83°33′E), Andhra Pradesh, India. A solar still with a 30° of fixed cover inclination, 1 m² of effective basin area, and a flat-plate collector (FPC) with an effective area of 2 m² were used. An attempt was also made earlier in passive mode to optimize the water depth for the same solar still for maximum yield and distillation efficiency. For the passive still, it is observed that the capacity of heat storage and heat drop are significant parameters that affect the still performance. For the selected still design, the study reveals that 0.04 m water depth is the optimum value for specific climatic conditions. In the active solar still, with the optimum water depth, different flow rates of 0.5, 1 and 1.5 L/min are considered through FPC. It is observed that both the mass flow rate and the variation of internal heat transfer coefficients with the mass flow rate have a significant effect on the yield and performance of the still. The experimental results show that the combination of 1.5 L/min mass flow rate and an optimum water depth of 0.04 m leads to a maximum yield for the active solar still. The enhanced yield of the active solar still is 57.55%, compared with that of the passive solar still, due to increase in area of radiation collection and more heat absorption rate.

中文翻译：

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印度沿海气候条件下被动和主动太阳蒸馏器性能的实验研究。

这项当前的工作旨在检查质量流量对馏分油输出的影响以及仍处于主动模式的太阳能的性能。在印度安得拉邦的沿海城市Kakinada（16°93′N / 83°33′E）进行了户外实验。具有30°固定盖倾斜度，1 m ²有效盆面积的太阳能蒸馏器和有效面积为2 m ²的平板集热器（FPC）被使用。早期还尝试了在被动模式下针对同一太阳蒸馏器优化水深，以最大程度提高收率和蒸馏效率。对于被动式蒸馏器，可以观察到热量存储和热量下降是影响蒸馏器性能的重要参数。对于选定的静止设计，研究表明，0.04 m的水深是特定气候条件的最佳值。在具有最佳水深的有源太阳能蒸馏器中，通过FPC考虑了0.5、1和1.5 L / min的不同流速。可以看出，质量流量和内部传热系数随质量流量的变化都对蒸馏器的产量和性能有显着影响。实验结果表明1。5 L / min的质量流量和0.04 m的最佳水深导致活性太阳能蒸馏器的最大产量。与被动式太阳能蒸馏器相比，主动式太阳能蒸馏器的产率提高了57.55％，这是由于辐射收集面积的增加和更高的吸热率。