Thermal Performance Enhancement of Indirect Solar Dryers Through Baffle Geometry Optimization: Mint Drying Case Study in Algerian Sahara
DOI:
https://doi.org/10.51646/jsesd.v14i1.516الكلمات المفتاحية:
solar–geothermal systems، thermal imbalance، energy policy، energy modeling، multiobjective optimization.الملخص
This paper presents a study on a solar drying system that utilizes a flat-plate collector with forced convection airflow, tested using three baffle designs: simple, triangular, and serpentine. The system was developed to efficiently dry mint plants, which are widely cultivated in the arid region of El Oued, Algeria. Experiments were conducted under real weather conditions over three days in May, with measurements taken daily from 8:00 AM to 4:00 PM. A comprehensive evaluation of the system’s thermal and drying performance was carried out, with key parameters measured and analyzed, including collector temperature, outlet temperature, drying chamber temperature, solar radiation, moisture content, mass loss, shrinkage ratio, and thermal efficiency.
The results demonstrate that the serpentine baffle design outperformed the others, achieving higher temperatures, faster moisture removal, and improved shrinkage efficiency. The triangular configuration exhibited moderate performance, while the simple baffle design proved to be the least effective. These findings underscore the strong correlation between collector geometry and drying efficiency. Moreover, the study highlights the impact of airflow design on heat transfer and mass reduction, offering practical insights for optimizing low-cost, sustainable solar drying technologies in semi-arid regions.
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