A Review on Solar Drying of Agricultural Produce

Tiwari, Anupam

doi:10.4172/2157-7110.1000623

Cited by 118 publications

(72 citation statements)

References 30 publications

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“…Also the work done by Refs. [1], [6], [13] and [14] reported a reduction of drying time with use of conventional dryers.…”

Section: Resultsmentioning

confidence: 99%

Evaluating Low Cost and Sustainable High Quality Cassava Drying Technologies among Small and Medium Processors in Uganda

Ijala¹,

Alacho²,

Ogwang³

et al. 2017

JFSE

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Cassava regarded as a white gold of Africa is driving the agricultural commercialization and industrialization with small to medium technologies in Uganda. There is an over-whelming demand for high quality cassava flour (HQCF) by Bakeries, beverage industry, paper board and composite end markets. The end market for HQCF dictates on its quality attributes and rewards for its quality in terms of price offered within their minimum standards. However, obtaining sustainable amounts of HQCF for these markets calls for devoted efforts. Limited types of HQCF processing technologies exist and if they exist, their efficiency, costs and sustainability are not well understood. We evaluated high quality cassava drying technologies in Northern and Eastern Uganda in two years using naturally ventilated wooden screen solar drying structures and open air sun drying structures. Naturally ventilated wooden screen solar dryers produced clean dry high quality cassava chips free off insect and bird contamination and caused faster drying to less than 14.3% MC in 1.5 hours than open outside drying conditions. We recommend naturally ventilated wooden screen solar dryers for small and medium cassava processors during dry and rainy season. Half tone to one tone cassava chips dryers per day drying unit can cost one 2,258-4,338 USD to make it functional. Also open outside raised metallic racks with black surface can give good results on a good sunny day especially for starters on small scale basis. A small durable unit of 150 kilograms per day can be made with 500 USD.

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“…Also the work done by Refs. [1], [6], [13] and [14] reported a reduction of drying time with use of conventional dryers.…”

Section: Resultsmentioning

confidence: 99%

Evaluating Low Cost and Sustainable High Quality Cassava Drying Technologies among Small and Medium Processors in Uganda

Ijala¹,

Alacho²,

Ogwang³

et al. 2017

JFSE

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“…As a type of biodrying, the greenhouse dryer is operated by the action of solar-energy striking directly on the product inside it [54]. The drying process in a greenhouse results in two main effects: (a) the metabolic heat generation by natural aerobic bioconversion of the organic matter, called the process of biodrying [27,37,50] and (b) solar energy stored as heat inside the greenhouse that increases the air temperature [50].…”

Section: Biodryingmentioning

confidence: 99%

Drying methods for municipal solid waste quality improvement in the developed and developing countries: A review

Tun

Juchelková

2018

Environmental Engineering Research

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Nowadays, drying methods for municipal solid waste quality improvement have been adopted in the developed and developing countries to valorize wastes for a renewable energy source, reduce dependency on fossil fuel and keep safer disposal at landfills. Among them, biodrying, biostabilization, thermal drying and solar drying are the most common. Drying of municipal solid waste could offer several environmental and economic benefits. Therefore, this review highlighted the drying methods for municipal solid waste quality improvement around the world and compared them based on the reduction of moisture, weight and volume of municipal solid wastes against drying temperature and time by using statistical analysis. It was observed that the drying temperature of different drying methods accounted for 115 ± 40°C for thermal drying, 59 ± 37°C for solar drying, 55 ± 15°C for biodrying and 58 ± 11°C for biostabilization. Among the drying methods, thermal drying provided the shortest drying time. The moisture reduction, weight reduction, volume reduction and heating value increase of municipal solid waste could vary with drying temperature and time. Finally, the benefits and drawbacks of different drying methods were specified, and recommendations were made for the future efficient drying.

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“…Recently, they are evolved rapidly and are identified into two generic groups, known as the passive solar dryers and the active or hybrid solar dryers. Currently, several solar dryer models are operated successfully, as solar tunnel dryer, solar cabinet drier and drier integrated with solar air heater [3]. Solar air collectors, which are part of the solar dryer, are heat exchangers, whereas the heat exchange operation is based on absorbing the incident solar radiation, converting it into heat, and transferring this heat to a fluid flowing through the collector [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

Bouhdjar¹,

Hanini²,

Boualit³

et al. 2019

I2M

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A numerical simulation to predict the thermal performance of a longitudinal solar dryer has been carried out. For this, a mathematical model, based on the finite element method, has been developed to evaluate the thermal behavior of the solar dryer using a control system. The main objective of the used control system is to maintain the drying temperature inside a suitable range for the product to dry, under varying weather conditions, over the time drying process. This is achieved through many different steps. As, an example, at the beginning of drying process when solar radiation is low, the air flow rate at the inlet varies between Re=25 and Re=85. In other hand, when solar radiation is higher, fresh air is injected. The outcomes of simulation work showed that the obtained results are generally satisfactory. Nonetheless, this model can be further refined to obtain better results, as a more stable gradient temperature, over the full drying period. Moreover, it is worthy mentioned that thermal storage system can be combined with the studied solar drier, in the way to compensate the heat insufficiency, during low solar radiation days.

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A Review on Solar Drying of Agricultural Produce

Cited by 118 publications

References 30 publications

Evaluating Low Cost and Sustainable High Quality Cassava Drying Technologies among Small and Medium Processors in Uganda

Evaluating Low Cost and Sustainable High Quality Cassava Drying Technologies among Small and Medium Processors in Uganda

Drying methods for municipal solid waste quality improvement in the developed and developing countries: A review

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

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