Abstract            Volume:12  Issue-1  Year-2024         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

This paper is an effort to briefly discuss the recent research and development on solar and other types of dryer technologies for roselle (Hibiscus sabdariffa L.) drying and to review some important work carried out across the world. After reviewing the available research papers, solar, sun, electric oven, freeze, shade, microwave, cross flow, infrared and other drying technologies are available for drying of roselle leaves and calyces. Efforts also have been made to review the available solar dryer technologies, for drying of other agro-products. It is observed that among the different types of solar dryers, the indirect forced convection solar dryer may be highly suitable or superior for industrial, commercial and large scale applications due to its various important points like speed and quality of drying, easily incorporating back-up unit, easily eliminating the tray reshuffling, scope of integrating with existing drying system, possibility of uniform drying, attached any types of solar air heating unit, reduce drying area needed, reduces labour cost, good controls and automation is possible, reduce the drying time, large capacity drying is possible, stand alone technologies may be designed, on farm operation is possible without grid power. Based on very good concepts available in all research paper, an efficient and engineered indirect forced circulation solar dryer for roselle fruits and leaves drying may be planned to develop. This dryer may be useful for any of the agro-industrial products.

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