Abstract In the present work, double-pass indirect solar dryer (DPISD) and double-pass indirect solar dryer with mesh absorber modification (DPISDMA) have been designed, analyzed, manufactured and tested. The main aim of this study is improving the thermal efficiency of double-pass solar air collector by integrating iron meshes. Pepino fruit (Solanum muricatum L.) samples in two thicknesses have been used in the experimental study. Also, CFD analysis of both solar air collectors and drying chamber and quality metrics such as phenolic, total flavonoid contents and antioxidant activity have been conducted. Numerical simulation and experimental results showed that using mesh modification has positive influence on the performance of the collector. The highest value of the average efficiency of the dryer was obtained in DPISDMA for the thin sample thickness as 23.08%. According to quality analyses, the experiments which done in DPISDMA gave the best results with highest values of TPC, TFC and antioxidant activity values (p

中文翻译：

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低成本铁网改造的间接太阳能干燥器的实验和CFD研究

摘要 在目前的工作中，设计、分析、制造和测试了双通道间接太阳能干燥器（DPISD）和带有网状吸收器改性的双通道间接太阳能干燥器（DPISDMA）。本研究的主要目的是通过集成铁网提高双通道太阳能集热器的热效率。实验研究中使用了两种厚度的佩皮诺果实 (Solanum muricatum L.) 样品。此外，还对太阳能空气收集器和干燥室以及酚类、总黄酮含量和抗氧化活性等质量指标进行了 CFD 分析。数值模拟和实验结果表明，使用网格修改对集热器的性能有积极的影响。在 DPISDMA 中获得的干燥器平均效率的最高值为薄样品厚度为 23.08%。根据质量分析，在 DPISDMA 中进行的实验给出了最好的结果，其中 TPC、TFC 和抗氧化活性值最高 (p