The improvement of roselle petals quality using solar greenhouse dryer: A case study at the Local Herbal Learning Center, Mae Mo district, Lampang province
Keywords:
Drying, Greenhouse dryer, RoselleAbstract
This research, study evaluates the effectiveness of a greenhouse solar dryer in reducing the moisture content of dried red roselle petals at the Local Herbal Learning Center in Mae Mo District, Lampang Province. The research demonstrated that the greenhouse solar dryer efficiently reduced the initial relative humidity of the petals from 23.45% to a final moisture content of 3.70% within 6 to 9 hours. By employing programmable logic control, the dryer maintained precise temperature and humidity levels, optimizing the drying conditions. Comparative analysis against Thai Community Product Standards (TCPS) 480/2547 revealed significant improvements in product quality, with the moisture content of the dried petals decreasing from 14.67% to 7.34%, meeting established standards. Additionally, the dried petals adhered to safety criteria for heavy metals and microbial contamination, confirming the effectiveness and reliability of the greenhouse solar dryer.
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