Drying performance and economic analysis of novel hybrid passive-mode and active-mode solar dryers for drying fruits in East Africa

Recent Advancements in Technical Design and Thermal Performance Enhancement of Solar Greenhouse Dryers

“…The application of the TES ensures that uninterrupted wood drying and temperature of the drying chamber are greater than that of the ambient air by about 4-20 • C during the night. Mohammed et al [62] conducted an economic analysis and evaluated the drying performance of novel hybrid active and passive-mode solar dryers for drying fruits in East Africa. A passive hybrid improved solar dryer (ISD) and improved PV-assisted hot air dryer using an active hybrid solar dryer 'Solar Photovoltaic and Electric (SPE)' were built as low-cost methods to dry fruits in Uganda.…”

Design of an Indirect Dryer with Coupling of Solar Collectors and its Thermal Characterization by Drying the Mint Leaves (Mentha spicate)

“…The application of solar drying techniques is currently prevalent. In the literature, there are essential publications worldwide on developments in the design and operation of solar dryers to reduce drying times by increasing their efficiency without sacrificing the quality of the final product: open sun drying, natural or forced convective drying (T., Al-Ismaili, Janitha Jeewantha, & Al-Habsi, 2019), photovoltaic-ventilated mixed-mode greenhouse solar dryer (Vengsungnle et al, 2020), (Chauhan, Kumar, & Gupta, 2017), indirect type tunnel (Mewa et al, 2019), hybrid passive-mode and active-mode (Mohammed, Fatumah, & Shadia, 2020), hybrid solar dryer coupling evacuated tube collectors, flat plate collectors, supported with electric fan heaters and the system for modulating the velocity field of the drying air (Pangavhane & Sawhney, 2002).…”

Accelerating and Mitigating Postharvest Losses in Nigeria Through an Automated Hydrid Dryer

“…Sun drying has certain limitations as it is dependent on the weather and sunshine hours. During uncertain rain and precipitation, the materials are not dried properly, which causes microbial growth and other qualitative deteriorations (Mohammed et al, 2020). The open air drying or sun drying has many limitations and due to the rise of fuel prices, depletion of fossil fuels, the use of modern drying technologies are not economical for drying agricultural product.…”

“…In a direct type, solar drying material is placed in a drying chamber having a transparent cover through which solar radiation enters and heats the food materials to be dried. In an indirect mode, solar energy is captured by a solar collector, which in turn heats the air (Mohammed et al, 2020;Tiwari, 2011). This heated air is then passed to the drying cabinet/chamber.…”

“…The largest dryers are typically utilized "off-farm," in elevators, and are continuous in nature: In Europe, mixed-flow dryers are favoured, but in some countries like the United States, cross-flow dryers are preferred. Continuous flow dryers have the capacity to dry up to 100 metric tons of grain per hour (Mohammed et al, 2020;Udomkun et al, 2020). In continuous dryers, the air must penetrate a depth of grain ranging from 0.15 m in mixed flow dryers to 0.30 m in cross-flow dryers.…”