Experimental evaluation of a passive indirect solar dryer for agricultural products in Central Mozambique

Matavel, Custódio; Hoffmann, H.; Rybak, Constance; Hafner, Johannes; Salavessa, João; Eshetu, Shibire Bekele; Sieber, Stefan

doi:10.1111/jfpp.15975

Cited by 9 publications

(5 citation statements)

References 73 publications

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“…For a given time (t), the minimum power (P min ) supplied to the air for drying is determined by formula (5).…”

Section: ) Drying Powermentioning

confidence: 99%

“…Drying food in the sun and in the open air is an ancestral practice that does not always produce good quality products. Improved techniques for using solar energy are little known, but nevertheless make it possible to obtain economical, ecological products of better quality (color, flavor, taste, texture, aroma) and are easy to use [4] [5].…”

Section: Introductionmentioning

confidence: 99%

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Experimentation of a Forced Convection Solar Dryer for Drying Sweet Potatoes at the Higher Institute of Technology of Mamou-Guinea

Sakouvogui,

Barry,

Sakho

et al. 2023

WJET

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This study was carried out at the Mamou Higher Institute of Technology during the period from March 10 to April 15, 2022, with the aim of designing and testing a solar dryer with forced convection by drying potatoes. The dryer was designed using local materials. Its main geometric parameters are: 1) height of the drying chamber (90 cm), 2) length of the drying chamber (50 cm), 3) width of the drying chamber (43 cm), 4) surface of the racks (0.1806 m 2 ), 5) surface of the heat accumulator (0.2537 m 2 ). The experiment focused on the vacuum test of the dryer for two days and that of the drying of the sweet potato for three days from 8:30 a.m. to 5:30 p.m. The average vacuum test temperature values of the three environments are respectively accumulator (43˚C), dryer chamber (41˚C) and ambient environment (34˚C). Four kilograms (4 kg) of boiled sweet potato were dried. The average temperatures in the accumulator and in the drying chamber during the three days of drying are respectively 33˚C and 39˚C. The final mass of the dried product is 1.2 kg, with a quantity of water extracted of 2 liters or 63% of the initial mass of the product. The average drying rate is 0.074 kg/h. The drying kinetics showed a decreasing rate in the absence of the heating period and the constant rate period.

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“…For a given time (t), the minimum power (P min ) supplied to the air for drying is determined by formula (5).…”

Section: ) Drying Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimentation of a Forced Convection Solar Dryer for Drying Sweet Potatoes at the Higher Institute of Technology of Mamou-Guinea

Sakouvogui,

Barry,

Sakho

et al. 2023

WJET

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“…Thermal efficiency was obtained by integrating fins on the absorbing plate and PV panel. Matavel et al, [19] realized an experimental evaluation of a passive indirect solar dryer for drying amaranth and maize grains. Thermal efficiency, aroma, texture, and color in the case of an indirect dryer were improved compared to an open solar drying system.…”

Section: More Maintenance Costmentioning

confidence: 99%

Recent advances in solar drying technologies: A Comprehensive review

Behera

Mohanty

2022

Journal of Energy Systems

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Preservation of food and vegetable products is an age-old practice for the retention of flavor, appearance, and quality. From ancient times, driers for drying food grains work on direct sun rays, firewood, fossil fuels, and coals causing carbon release. These available methods are expensive, unreliable, and unhygienic; thereby the use of a solar dryer working on free and clean energy is better for higher value addition to food preservation. The objective of this exploration is to study the recent developments in the use of different types of solar dryers for drying foods, vegetables, seafood, etc. There exist many studies on the effects of the parameters such as temperature, relative humidity, and speed of air, turbulence effect, sun irradiation, and the latitude of the location in the solar drying process. The findings show that the climate conditions such as solar radiation and atmospheric air play an important role in the drying efficiency of the solar dryer. A phase change material stores thermal energy during the daytime and releases heat during the nighttime. This process improves thermal efficiency and reduces heat loss during the drying period. On the one hand, a hybrid dryer integrated with a solar panel produces electricity for the operation of a DC blower circulating hot air inside the drying chamber for better drying. In addition, a critical review has been performed on the usage of different absorbing plates increasing heat transfer rate, use of various phase change materials for heat storage, and analysis of CFD simulation.

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“…Small farmers use solar energy to dry their produce after harvest as an attempt to ensure safe storage of food until the next harvest. However, the use of traditional open solar drying to dry agricultural produce results in significant losses such as contamination from dust, rain, spoilage, insects, and other pests (Matavel et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Solar dryer technologies for agricultural products in Mozambique: An overview

Chichango

Cristóvão

Muguirima

et al. 2023

RSD

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Mozambique is an agricultural country. However, it faces numerous challenges to feed the population and reduce poverty. Recently, the situation is being worsened by high environmental, social vulnerability and extreme events influenced by climate disruption in the form of cyclones, droughts, and floods. Sustainable use of resources has become an issue in each food supply chain segment. People often suffer from food shortages: some caused by natural disasters, others by excessive post-harvest losses due poor storage facilities. Therefore, reducing post-harvest losses through preservation technologies is an important step toward reaching ending hunger (SDG 2) and ensuring sustainable consumption and production patterns (SDG 12). Thus, practical ways of cheaply and sanitarily preserving foods are needed. The post-harvest losses of agricultural products can be reduced drastically by using renewable energy sources like solar energy. This article presents a review and possibilities of using solar drying, focusing on the technical needs of small farmers in Mozambique. In this study, it was concluded that solar drying is one of the most efficient and cost-effective, renewable, and sustainable technologies to conserve agricultural products. However, solar dryers, being used in Mozambique, are only useful in the presence of solar radiation and useless at night or during cloudy days. To enable off-sun drying, heat storage must be integrated. This way, it can trigger the hopes for alleviation of poverty, opportunity for decent work, economic growth and reduce inequality.

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Experimental evaluation of a passive indirect solar dryer for agricultural products in Central Mozambique

Cited by 9 publications

References 73 publications

Experimentation of a Forced Convection Solar Dryer for Drying Sweet Potatoes at the Higher Institute of Technology of Mamou-Guinea

Experimentation of a Forced Convection Solar Dryer for Drying Sweet Potatoes at the Higher Institute of Technology of Mamou-Guinea

Recent advances in solar drying technologies: A Comprehensive review

Solar dryer technologies for agricultural products in Mozambique: An overview

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