Review on Technique used in Solar Dryer.

This paper presents an overview of solar dryer technologies, highlighting current concerns, offering potential research directions, and gathering the most recent advancements. A sustainable and environmentally beneficial way to preserve food products, agricultural produce, and other commodities is solar drying. The review starts off by explaining the basic ideas behind solar drying procedures, including different design setups and operating parameters. The performance of various solar dryer types- direct, indirect, and hybrid systems- is methodically assessed in this paper, with a focus on each system’s benefits and drawbacks. Indirect natural convection solar drying technique was used to dry banana slices with drying efficiency of 22.38%. Also, v shape corrugations were used on absorber plate to further improve the drying efficiency. It also covers new developments in design elements and materials that improve the dependability and efficiency of solar dryers. Absorber plates were coated with black paint containing 1% graphene nanomaterial. Impact of thickness of glass cover on drying efficiency was studied. Parabolic concentrators are used to enhance the efficiency of solar dryers. The drying time was reduced by 21% compared with solar dryers without concentrator. Additionally, the review covers important factors like affordability, scalability, and adaptability to various applications and climates. Major Findings: The performance of various solar dryers has been studied in this paper. It has been found that drying efficiency can be improved by providing black paint coating containing 1% graphene nanomaterial. Parabolic concentrators have a significant impact on the performance of solar dryers. [ABSTRACT FROM AUTHOR]