Relevant bibliographies by topics / Solar dryers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Solar dryers'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Solar dryers"

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Ferreira, A. G., A. L. T. Charbel, R. L. Pires, J. G. Silva, and C. B. Maia. "EXPERIMENTAL ANALYSIS OF A HYBRID DRYER." Revista de Engenharia Térmica 6, no. 2 (December 31, 2007): 03. http://dx.doi.org/10.5380/reterm.v6i2.61680.

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Artificial dryers promote a high-quality food drying, in spite of the considerable energy consumption. Solar dryers use only solar energy to heat the drying airflow; nevertheless, it is not possible to control the airflow thermal conditions. Hybrid solar dryers arise as an interesting option to reduce the drying costs (compared to the artificial dryer’s costs). Hybrid solar dryers improve the quality of the final product due to the control of the thermal drying condition. This paper presents an experimental analysis of an innovative hybrid solar-electrical dryer. This dryer consists of two chambers: solar chamber and drying chamber with electrical air heater. An experimental evaluation of the airflow in the device was performed and the average values of the temperature and the mass flow were presented as a function of the ambient conditions. To determine the performance of the proposed dryer, banana slices were dried in the device and the results were compared with natural sun drying and artificial drying.
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Balasuadhakar, Arumugam. "Natural Convection Solar Dryers for Agricultural Products — A Comprehensive Exploration." Indian Journal of Science and Technology 14, no. 13 (April 9, 2021): 1021–27. http://dx.doi.org/10.17485/ijst/v14i13.126.

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Objectives: To make review on passive solar dryers and its performance of drying agricultural products. Methods: This article focuses on the development in various categories of passive solar dryers in last six years. The different studies carried out in direct, indirect and mixed mode types of passive dryers for drying agricultural products in the year of 2014 to 2020 have been considered this review. Investigations on forced convection solar dryers have not been included in the current paper. The various experimental setups of solar dryers, specimens used for experimentation, measured output parameters and performance have been illustrated. The changes made in construction of solar dryers for improving the performance have also been reviewed. Findings:The mixed mode passive solar dryer is found to be superior in terms of drying time, better utilization of solar energy and efficiency compared to other passive dryers. Novelty: Several review articles have been published in solar dryers. Nevertheless, no comprehensive reviews have hitherto been published on passive dryers in particular. Hence, our current review article focuses on development in passive dryers and its advancements with emphasis on dryer design features, specimen and measured output parameters. Keywords: Passive solar dryers; Natural convection solar dryers; Direct solar dryers; Indirect solar dryers; Mixed mode solar dryers
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S, Arunprasad, Saravanan P, and Arulraj R. "Design And Analysis of Flat Plate Solar Air Dryer." International Journal of Mechanical Engineering 7, no. 1 (January 25, 2020): 37–40. http://dx.doi.org/10.14445/23488360/ijme-v7i1p105.

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Solar dryers are equipment and using solar energy for drying substances, especially food. There are two common types of solar dryers: Direct & indirect. This is a dryer type in which the product to be dried directly absorbs the solar radiation. It is also referred to as a natural convection cabinet dryer, because the solar radiation falls directly on the surface; the product quality is reduced. Heated air from the drying chamber is blown through. A solar dryer's basic function is to heat air with solar energy to a constant temperature, which enables the moisture extraction from crops within a drying chamber. The main objective of flat plate solar air dryer model based on without tray & with tray chamber in Creo parametric software & computational fluid dynamics in Ansys software. Generally, solar air dryer is heat loss is possible, so it’s reduced with help of insulation material (glass wool & polyurethane). To predict the temperature difference in various air flow with insulation material. Furthermore, choose the better insulation material & difference between with & without tray chamber.
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Godse, Rajesh S., and Pritee Purohit. "Innovative Solar Air Dryer Designs for Agricultural Products-A Review." Energy and Environment Focus 7, no. 3 (December 1, 2023): 229–36. http://dx.doi.org/10.1166/eef.2023.1297.

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Indeed, agricultural technological development plays a crucial role in the agricultural commercialization and socio-economic transformation of India. Enhancing farming through solar dryers has been considered to be a key strategy for enhancing food security and greater socioeconomic change. Drying removes the majority of the product’s moisture content; it is a crucial post-harvest technique for agricultural goods that may increase quality, decrease losses during storage, and save transportation costs. The literature study provides evidence that solar dryers that use phase change material and operate in indirect or mixed modes are more effective than direct drying solar dryers in drying agricultural goods. This review study’s main objective is to give an overview of the recent developments in solar dryer technology achieved by different researchers. Innovative solar dryer designs for drying agricultural products are reviewed in this present work. A thorough analysis of the design, operation, uses, and comparison of solar dryers is conducted. The solar dryers design their modifications and different techniques to improve thermal performance are studied thoroughly. Hybrid solar dryer with CPC, ETC, photovoltaic technology can work as an independent unit and proves the better thermal performance dryer unit as compared to conventional dryers. The new improvements to hybrid dryers are also discussed in detail. Present study will be helpful for developing an economical dryer with variety of drying parameters and different agricultural products.
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POONIA, SURENDRA. "Performance evaluation and economic analysis of inclined solar dryer for Capsicum annuum L. (Red chilli) drying." Annals of Plant and Soil Research 26, no. 2 (May 1, 2024): 288–95. http://dx.doi.org/10.47815/apsr.2024.10362.

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This study presents an assessment of the performance and economic viability of solar dryers for drying perishable agricultural products. The dryer was constructed using locally sourced materials such as galvanized iron sheet, M.S. angle, glass, and S.S. wire mesh. The ability to tilt the dryer allows for optimal solar radiation absorption throughout the year in Jodhpur, India. It is well-established that a tilted surface captures more solar radiation compared to a horizontal plane, hence the utilization of a solar dryer in this research. A drying experiment was carried out in January 2023 using the dryer to dehydrate red chilli (Capsicum annuum L.). The maximum stagnation temperature inside the drying chamber was recorded at 65°C, which decreased to 55°C when loaded with 10 kg of chilli, while the outside ambient temperature was 26°C on a clear sky day (from 08:00 h to 18:00 h) in January 2023. Over the course of seven days, the moisture content of the chilli decreased from 80% (wet basis) to approximately 9%. The open sun drying method took 14 days for reducing the moisture content of red chillies to the same level. The dryer's thermal efficiency was calculated to be 16.25%. The economic analysis of the solar dryer indicated a high internal rate of return (IRR) of 82.5% and a short payback period of 1.50 years, highlighting its cost-effectiveness. The cost-benefit ratio was found to be 1.98, demonstrating the potential of solar dryers as a substitute for traditional drying methods. Economic parameters such as net present value (₹40220) and system annuity (₹5430) confirmed the economic feasibility of the system. Inclined solar dryers in remote or rural areas have the potential to significantly reduce postharvest losses and carbon emissions. The adoption of solar dryers would greatly benefit farmers in the arid region of Rajasthan.
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Agrawal, Sanjay, Trapti Varshney, and Jitendra Kumar. "Comparative Analysis of Hybrid Photovoltaic Thermal (PV/T) Solar Dryer." Asian Journal of Water, Environment and Pollution 20, no. 1 (January 23, 2023): 57–66. http://dx.doi.org/10.3233/ajw230009.

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As the world’s population is increasing, the demand for food is also increasing. Drying techniques increase the life and quality of crop and industrial food products. It also improves the economic condition of farmers. Drying reduces the water stored within the product by evaporation. It can be done by the use of conventional energy and different methods. Sun radiation is used for open sun drying around the globe. Open sun drying has many disadvantages in comparison to other drying techniques. Solar drying is comparatively clean and effective. Solar dryers are of mainly four types: 1) direct solar dryer; 2) indirect solar dryers; 3) mixed mode solar dryer and 4) hybrid solar dryers. Because electric and heat energy demand is increasing day by day worldwide, PV/T solar dryer becomes an interesting and upcoming interest of research nowadays. In this review article basics of different kinds of solar dryers and recent advancements in hybrid PV/T dryers have been presented. Results for drying grapes, medicinal herb, tomato, and wood using PV/T solar dryer are discussed in this study. Variations of drying time, energy consumption, efficiency with different air temperatures, air flow rate and RH are discussed. The use of different solar collectors, solar air heater and heat storage materials with hybrid PV/T dryer have also been reviewed.
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Gautam, Jitendra Kumar, and Pankaj Verma. "Review Paper on Diffierent Types of Solar Dryer." International Journal for Research in Applied Science and Engineering Technology 12, no. 7 (July 31, 2024): 250–57. http://dx.doi.org/10.22214/ijraset.2024.63559.

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Abstract: One of the most appealing and economical uses of solar energy is drying agricultural goods. With differing degrees of technical performance, a multitude of solar dryer types have been devised and developed across the globe. In general, solar dryers come in four different varieties: (1) direct solar dryers, (2) indirect solar dryers, (3) mixed-mode dryers, and (4) hybrid solar dryers. The product being dried, as well as technical and financial concerns, are reviewed in this paper together with other solar dryer kinds. Technically speaking, integrated storage, high efficiency, compact collector design, and long-life drying systems are the main focuses in the development of solar-assisted drying systems for vegetables. There exist alternative systems to air-based solar collectors. By using a water-to-air heat exchanger, water-based collectors are another option. A water-to-air heat exchanger can be used to push hot air used for drying agricultural products to pass through it. As part of the solar drying system, the hot water tank stores heat
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Jamal. "Control of Natural Convection Flow for Optimize the Performance Solar Dryers." Applied Mechanics and Materials 818 (January 2016): 272–75. http://dx.doi.org/10.4028/www.scientific.net/amm.818.272.

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The purpose of this research to optimize the performance of solar dryers. Optimizing the performance of solar dryers can be done by observing the effect of natural convection flow controls to change the performance of solar dryers. Experimenting performed by the direct measurement method. In the solar dryer made in space collector inlet and outlet of the drying chamber. There are two outlet on the bottom and the top of the drying chamber. Natural convection flow control is done by adjusting the three variations (full open, half open and full close) openings on the upper outlet of the drying chamber. For the most accurate results, testing was conducted simultaneously three kinds of variations of openings using three solar dryers. The results show that optimal conditions of the solar dryer is in the half open position of the outlet flow natural convection.
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Itodo, Isaac N., Joshua O. Ijabo, Japheth A. Charles, Nathaniel N. Ezeanaka, and Solomon O. Akpa. "Performance of Desiccant Solar Crop Dryers in Makurdi, Nigeria." Applied Engineering in Agriculture 35, no. 2 (2019): 259–70. http://dx.doi.org/10.13031/aea.12895.

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Abstract. Dryers in humid tropical locations like Makurdi, Nigeria (Lat. 7°7´N), have not performed significantly better than the open air sun drying of crops because of the high ambient relative humidity that is often not less than 70% all year round, hence the need to use desiccant augmented dryers. The performance of three types of non-regenerative desiccant solar crop dryers was undertaken to determine the best performing dryer configuration for further improvement and use in the location. The dryers developed were the indirect-active desiccant dryer (IADD), direct-active desiccant dryer (DADD), and the direct-passive desiccant dryer (DPDD). The dryers were designed, constructed, and their performance evaluated and compared to open air sun drying (OASD). The drying rate (kg/h) and Dryer Performance Coefficient (DPC) were used to evaluate the performance of the dryers. The active dryers were operated at a fan speed of 1.2 m/s. Moisture absorption rate and % moisture absorbed to its weight were used to evaluate the performance of the desiccant. The desiccant used was a composite of rice husk ash (RHA) and calcium chloride binded with cement in the ratio of 1:1:1 by weight. The analysis of variance (ANOVA) at p = 0.05 was used to determine if there was a significant difference in the measured parameters of the dryers. The Duncan’s New Multiple Range Test (DNMRT) at p = 0.05 was used to separate the means where there was a significant difference. The drying rates were 0.23, 0.19, 0.16, and 0.13 kg/h for the DADD, DPDD, IADD, and OASD, respectively. The drying rate of the OASD was not significantly different from that of the IADD. The DPC was 1.53, 1.40, and 1.15 for the DADD, DPDD, and IADD, respectively. The DPC of the dryers were significantly different. The direct active desiccant dryer had the highest temperature of 45°C, the lowest relative humidity of 50% at the drying unit and the highest rate of moisture absorbed by the desiccant of 0.24 kg/h. The non-regenerative RHA desiccant had maximum moisture absorption of 28% of its weight. The direct active desiccant dryer is recommended for further development for use in humid tropical locations. Keywords: Crop, Desiccant, Dryer, Humid tropic, Performance, Solar.
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Jamal, Jamal. "Analisis Kinerja Pengering Surya Tipe Rak Menggunakan Heat Absorber Pelat Gelombang dengan Aliran Udara Natural." Jurnal Teknik Mesin Sinergi 20, no. 1 (April 14, 2022): 1. http://dx.doi.org/10.31963/sinergi.v20i1.3414.

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The current study aims to determine the performance of a rack-type solar dryer. The solar dryer uses a heat absorber in the form of a large wave plate and a small wave which is placed in the solar collector room. The dried material is cassava. The system used is natural air flow due to density differences. The research was carried out by making two rack-type solar collectors, the difference being the heat absorber used, one large wave and the other small wave. The test was carried out simultaneously between the two solar dryers. In this study, the results of large-wave solar dryers with an average efficiency of 9.24% had a better performance than small-wave solar dryers with an average efficiency of 7.68%. In the large wave solar dryer, the average efficiency on rack 1 is 1.33%, on rack 2 is 3.83% and on rack 3 is 5.93%. In the small wave solar dryer, the average efficiency on rack 1 is 1.50%, on rack 2 is 3.88% and on rack 3 is 2.30%.
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Dissertations / Theses on the topic "Solar dryers"

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Hassanain, Ahmed A. "Investigation of solar chimneys and tubular transpired solar air heaters as improved systems for solar dryers." Thesis, University of Ulster, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393770.

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Sotocinal, Samson A. "Design and testing of a natural convection solar fish dryer." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60638.

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A natural convection solar fish dryer consisting of a flat-plate solar collector, drying chamber, and an auxiliary heater was designed, constructed and tested in the Philippines. The dryer is capable of drying 5 kg of fish in 10 hours.
Water was first heated in a flat-plate solar collector then through thermosyphon effect, heat and mass was moved to the heat exchanger where heat was transferred to the air. Heated air was allowed to flow through the drying chamber where trays of prepared samples of fish were laid. Pre-drying treatment of fish similar to those used in commercial practice, were used for individual drying experiments in order to permit a general evaluation of the system.
Seven drying experiments using different fish samples were conducted and the data generated was used to determine the efficiency of the system in terms of solar energy utilization. Results indicate that the system function efficiently at a minimal water temperature increase of 10$ sp circ$C, and the dryer operates at a system efficiency of 9 per cent which compares well with the findings of Yu Wai Man (1986) which found that natural convection solar dryers operate in the efficiency range between 7 to 14 per cent.
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Ekechukwu, O. V. "Experimental studies of integral-type natural-circulation solar-energy tropical crop dryers." Thesis, Cranfield University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379485.

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Tang, Lisa S. B. Massachusetts Institute of Technology. "The effects of geometrical changes on airflow of developing-world solar fruit dryers." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127869.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 43-45).
Small fruit-drying operations are becoming increasingly prevalent in the developing world. Many of these operations rely on solar thermal dryers with small fans to induce active air flow, which enhances drying capabilities. This thesis examines the effects of changes in dryer geometry on the air flow within flatbed solar dryers. The interior of a dryer was simulated using Ansys Fluent, and air flow velocity and patterns were observed as the dryer's length, width, and height were varied. It was found that a small fan placed at the dryer's entrance introduces a thin jet of air, which slows and spreads out over the course of the dryer. A steady air flow pattern was reached 4 meters into the modeled dryer. Reducing dryer height was found to increase the air flow velocity at the dryer's center, but not at the dryer's bottom where fruit is usually located. In addition to decreasing dryer height, the study recommends vertically raising the racks of fruit further above the dryer bottom. Air flow consistency across the width of the dryer persisted as an issue through the variations of width and height.
by Lisa Tang.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
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Diallo, Alseyni. "A solar fish dryer for the Republic of Guinea." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/562780.

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The Republic of Guinea is located on the west coast of Africa at about 11° North latitude. A large portion of Guinea's supply of protein is dried fish. The actual drying method operates under open air, the foodstuff being unprotected from unexpected rains, windborne dirt and dust, and from infestation by insects, rodents, and other animals. More, the deforestation rate is increasing year after year, depleting the source of fuel for drying. Practical ways of drying fish cheaply and sanitarily would be welcome.The present work develops a prototype solar dryer on the basis of natural convection of air. The device is comprised of a glazed flat plate collector, a furnace with translucent walls, and an air tunnel adjoining the two. Air entering the collector is heated and flows into the furnace where energy is absorbed by pieces of fish placed on horizontal racks. The air exits through an opening in the top of the device carrying moisture with it.Using the prototype solar dryer, a fish drying experiment was conducted at the Center for Energy Research, Education, and Service (CERES) at Ball State University. The primary objectives were to investigate drying rates, times, and loads expected for a dryer constructed using simple techniques and materials readily available in the Republic of Guinea. The drying experimental results are in many ways similar to those reported by previous authors.The solar dried product appears to be superior to the product of current drying methods and the foodstuff is protected from infestation or contamination during drying.Future work suggested by the project experience includes refinement of the dryer design and additional fish drying experimentation. An economic analysis would also yield information on the feasibility of widespread use of solar dryers for drying of fish in the Republic of Guinea.
Department of Physics and Astronomy
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Serem, Vincent Kipyego Arap. "Forced air solar system for drying of Arabica coffee in Kenya." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63902.

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Bonaparte, Anthony. "Solar drying of cocoa beans (Theobroma cacao) in St. Lucia." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23384.

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An indirectly heated solar drier fitted with a flat plate collector and a directly heated solar drier were compared with open air sun drying of cocoa beans under field conditions in St. Lucia. Sun drying was conducted on two surfaces, perforated steel and non perforated wood. The methods were examined for the ability to adequately dry fermented beans and effect on quality. Loading rates of 13.5, 26.9 and 40.4 kg/m$ sp2$ were examined.
Temperature increases of 15$ sp circ$C and 20$ sp circ$C above ambient were achieved in the indirect and direct drier, respectively. The solar driers were more efficient than sun drying units at removing moisture throughout at loading rates of 26.9 and 40.4 kg/m$ sp2$ but only in the initial stages at 13.5 kg. External mould development was therefore reduced. Open air sun drying on the wooden surface proved more effective in the final stages at 13.5 kg/m$ sp2$.
The dried beans were of similar internal quality despite faster drying in the driers. The various drying methods and loading rates produced beans of similar pH while only loading rates affected titratable acidity differently. The direct solar drier achieved lower final moisture levels at high loads and was the cheaper alternative.
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Starčević, Nikica. "Systematic design and process optimisation of a robot for treatment of biomass in solar dryers." München Oldenbourg-Industrieverl, 2009. http://d-nb.info/994276966/04.

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Silveira, Luciano Roberto da. "Sistema de aquisição de dados utilizando telemetria: aplicação em secador solar de produtos agrícolas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/11/11131/tde-07022012-145453/.

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A secagem para conservação de produtos agrícolas e alimentícios e feita geralmente com emprego de eletricidade ou combustível fóssil, que incrementa o custo do produto final. Dessa forma, faz-se necessário o desenvolvimento de sistemas que utilizam energia renovável, como a solar, de modo a reduzir custos sem prejuízo na qualidade do produto. Assim, um secador solar de convecção natural misto foi projetado e construído, bem como um sistema de aquisição de dados (SAD) utilizando telemetria, para monitorar temperatura e umidade relativa, ambas do ar, no interior do secador. Para o projeto do secador pesquisou-se na literatura diversos modelos já estudados, a m de reunir idéias para definição de um modelo particular. Apos construiu, um teste operacional foi realizado no secador, utilizando tomate cereja. O SAD foi construído em três partes: o transmissor com os sensores, protegido em caixa selada e afixado ao secador solar; o receptor, acoplado a um PC em local abrigado e cerda de 60 m distante do secador; e o software de aquisição de dados no PC. Os sensores foram fixados em três pontos diferentes do secador e protegidos com pedaços de tubo de PVC. O transmissor permite visualização instantânea de dados num LCD, gravação em cartão de memória SD e transmissão via RF para o receptor/PC. O software no PC e um aplicativo web, permitindo acesso externo e apresentando os dados em forma de gracos, tabela ou ilustração, alem de possuir um sistema de alerta via SMS para temperatura. Em testes de campo, o SAD apresentou bom funcionamento. Houve pouca perda de dados na transmissão, devido a veículos no caminho do sinal RF, e os sensores responderam corretamente as variações do ambiente. O secador apresentou boa resistência as intempéries, e o teste com tomate cereja mostrou que esta operacional.
Drying for preservation of agricultural and food products is usually done with the use of electricity or fossil fuel, increasing the cost of the nal product. Therefore, it is necessary to develop systems that use renewable energy such as solar, to reduce costs without impairing the quality of the product. Thus, a mixed-mode natural-circulation solarenergy dryer and a telemetry data acquisition system (DAS) to log air temperature and air relative humidity inside the dryer were designed and built. For the dryer design, in the literature several models already studied were investigated in order to gather ideas for dening a particular model. Once built, an operational test was conducted in the dryer, using cherry tomatoes. The DAS was built in three parts: the transmitter with the sensors, protected in a weather-resistant enclosure and xed in the solar dryer; the receiver, coupled to a PC in a sheltered place; and the PC software data acquisition. The sensors were put at three dierent points in the dryer and xed with PVC pipe pieces. The transmitter allows data instant viewing on an LCD, SD card logging and RF transmission to the receiver/PC. The PC software is a web application, allowing external access and presenting the data in graph, table or illustration, in addition to having an alert system to temperature by SMS. In eld tests, the DAS was worked well. There was little data loss in transmission due to vehicles in the RF signal path, and sensors correctly responded to the changing environment. The dryer had good weather resistance, and the test with cherry tomatoes showed that it is operational.
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Svenneling, Johnna. "Constructing a solar dryer for drying of pineapples : Implementing a solar dryer for sustainable development in Ghana." Thesis, Karlstads universitet, Avdelningen för energi-, miljö- och byggteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-15737.

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Drying of fruits has been done for many years and different techniques have been developed. For preservation of fruit, drying is a good method for producing sustainable food products that avoids waste. The interest in producing sustainable food products that are nutritious and safe from bacterial growth has increased. In developing countries large amounts of food are destroyed, while many people are undernourished. Every year large amounts of pineapples are produced in Ghana. The pineapples are either being sold fresh or distributed to juice producers. To minimize the wastes and improve the economy in rural areas, drying is an interesting method. The unreliable power supply system is a problem in Ghana. Power failure is frequent. During dry season, sun drying is a suitable method for Ghana, which has a tropical climate with dry and rain seasons. A solar dryer for pineapples has been developed, constructed, modified, tested and implemented in the village Edumafa, in a rural area of Ghana. The only energy source that has been used to dry the pineapples is the sun. Before the trip to Ghana, drying tests were made in a laboratory in Sweden and a prototype of the dryer was built in the university workshop. This was done to facilitate the work in Ghana by gaining experience from drying and constructing. The prototyping also clarified which type of tools that would be needed so the tools could be transported from Sweden. The results from drying pineapple slices at 70°C in an oven in Sweden resulted in slices with hard shells and a soft, moist content (the moisture could not be removed since it became enclosed inside the slices).The conclusion was drawn that the pineapples cannot be dried in such a high temperature. Slices were in good quality when dried at 50°C. Since the citizens in the village Edumafa have never dried pineapples before, it is important for them to learn how to use the dryer and keep it in good working condition. During wet season it is important that the dryer is protected against rain. In the mid of a sunny day, when the temperature in the ambient air was 30°C, the temperature in the drying chamber could be around 50°C. Temperatures over 50°C were possible to achieve and there were no risk for getting to high temperature in the drying chamber. Therefore good drying temperatures can be achieved. To change the economy in considerable proportions for the citizens in Edumafa, a bigger dryer is necessary. The villagers need investment help to afford a bigger dryer of this type. The dryer can minimize losses of pineapples and create bigger incomes if the solar dryer is maintained in good condition and the villagers use it often to dry pineapples.
Att torka frukt har gjorts i många år och olika tekniker har utvecklats. Torkning av frukt är en bra metod för att förlänga hållbarheten och minimera spill. Att producera mat som både har en lång hållbarhet, är näringsrik och har låg mikrobiologisk tillväxt har idag blivit mer och mer aktuellt.  I utvecklingsländer förstörs stora mängder av mat samtidigt som det finns ett problem med undernärda människor. I Ghana skördas stora mängder ananas varje år och säljs antingen färska eller skickas iväg för juiceproduktion. För att minimera spill och förbättra ekonomin på landsbygden, torkning är en intressant metod. Ett problem i Ghana är det instabila elnätet. Strömavbrott är vanligt förekommande och därför är det bra om torkningen sker med metoder som inte kräver elektricitet. Klimatet är tropiskt med torr- och regnperioder, och soltorkning passar sig bara under torrperioden. En soltork för ananas har utvecklats, byggts upp, modifierats, testats och implementerats i byn Edumafa på den ghanesiska landsbygden. Den enda energikällan som används av torken är solen. Inför resan till Ghana har i Sverige torkförsök gjorts i ett laboratorium samt en prototyp av en soltork byggts upp i universitetets verkstad. Detta för att underlätta arbetet i Ghana genom att få erfarenheter från torkning och byggande. Byggandet har även klargjort vilken typ av verktyg som kan tänkas behövas så att de kan bli transporterade från Sverige. Resultatet av torkförsöken i Sverige visade att vid 70°C blir ananasen bränd på ytan (fukten kan inte transporteras ut eftersom den blir instängd inuti skivorna), vilket gör att ananasen inte går att torka vid en sådan hög temperatur. Ananasskivorna fick bra kvalité vid torkning i 50°C i laboratoriets ugn. Eftersom soltorkning av ananas är något som byborna i Edumafa aldrig har gjort tidigare, är det viktigt att de förstår hur torken fungerar samt att de kan torka ananas på egen hand.  Under regnperioden är det viktigt att torken skyddas från regn. Mitt under en solig dag då utetemperaturen är cirka 30°C kan temperaturen i torkkammaren bli cirka 50°C. Temperaturer över 50°C var möjliga att uppnå och det blev aldrig för varmt i torkkammaren. Vilket tyder på att bra torktemperaturer kan uppnås. För att kunna få till stånd en betydande förändring i ekonomin i Edumafa, är det nödvändigt att bygga en större tork. Invånarna behöver ekonomisk hjälp till investeringen för att ha råd med en större tork av denna typ. Torken kan minimera spill av ananas och generera större inkomster, om torken bevaras i ett gott skick och invånarna använder den ofta för att torka i.
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Books on the topic "Solar dryers"

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1945-, Mathur A. N., Yusuf ʻAli, Maheshwari R. C, and National Workshop on Solar Drying. (1st : 1989 : Udaipur, India), eds. Solar drying. Udaipur [India]: Himanshu, 1989.

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Office, International Labour, ed. Solar drying: Practical methods of food preservation. Geneva: International Labour Office, 1986.

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1932-, Sodha M. S., ed. Solar crop drying. Boca Raton, Fla: CRC Press, 1987.

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Müller, Joachim. Trocknung von Arzneipflanzen mit Solarenergie. Stuttgart: Ulmer, 1992.

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Hassanain, Ahmed A. Investigation of solar chimneys and tubular transpired solar air heaters as improved systems for solar dryers. [s.l: The Author], 2000.

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Bond, Brian H. Design and operation of a solar-heated dry kiln for tropical lattitudes. Asheville, NC: U.S. Dept. of Agriculture, Forest Service, Southern Research Station, 2011.

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Unmole, H. Solar drying of fish and paddy. Rome: Food and Agriculture Organization of the United Nations, 1989.

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Unmole, H. Solar drying of fish and paddy. Rome: Food and Agriculture Organization of the United Nations, 1989.

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Bond, Brian. Design and operation of a solar-heated dry kiln for tropical latitudes. Asheville, NC: Southern Research Station, 2011.

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Fouga, Patrick. Acceptabilité des séchoirs solaires au Burundi. [Bujumbura?]: CURDES, 1985.

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Book chapters on the topic "Solar dryers"

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Norton, Brian. "Solar Dryers." In Solar Energy Thermal Technology, 191–209. London: Springer London, 1992. http://dx.doi.org/10.1007/978-1-4471-1742-1_11.

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Imre, L. "Solar dryers." In Industrial Drying of Foods, 210–41. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4613-1123-2_10.

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Tiwari, G. N., Arvind Tiwari, and Shyam. "Solar Crop Dryers." In Energy Systems in Electrical Engineering, 489–518. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0807-8_12.

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Kumar, Anil, Saurabh Ranjan, Om Prakash, and Ashish Shukla. "Exergy Analysis of Solar Dryers." In Solar Drying Technology, 239–62. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_8.

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Selvanayaki, S., and K. Sampathkumar. "Techno-economic Analysis of Solar Dryers." In Solar Drying Technology, 463–93. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_16.

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Singh, Shobhana. "Thermal Testing Methods for Solar Dryers." In Solar Drying Technology, 215–38. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_7.

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Bansal, N. K., and M. S. Sodha. "Techniques of Solar Crop Dryers." In Plant Fibers, 349–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_19.

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Nandwani, Shyam S. "Solar Cookers solar cooker/cooking and Dryers solar dryer to Conserve Human and Planet Health." In Solar Energy, 417–40. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5806-7_691.

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Prakash, Om, Saurabh Ranjan, Anil Kumar, and Ravi Gupta. "Economic Analysis of Various Developed Solar Dryers." In Solar Drying Technology, 495–513. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_17.

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Nandwani, Shyam S. "Solar Cookers solar cooker/cooking and Dryers solar dryer to Conserve Human and Planet Health." In Encyclopedia of Sustainability Science and Technology, 9486–509. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_691.

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Conference papers on the topic "Solar dryers"

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Terres, Hilario, Sandra Chavez, Raymundo Lopez, Arturo Lizardi, Araceli Lara, and Juan R. Morales. "Study of the Lemon Drying Process Using a Solar Dryer." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49696.

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A complete study for a solar dryer is shown. In this work the lemon drying process is considered. Also, results for temperature distribution, currents lines velocities and density distribution are presented inside of the dryer chamber. Curves for dried are obtained when the lost mass of the lemon is measured. For this purpose, a digital balance is used and during several intervals of time the measures are done. A Compact Field point device of National Instrument is used to measure temperatures inside of the chamber in the dryer. Thermocouples k-type were placed in different points. By acquisition data, the values of temperature were measured for the test. By means of software (ANSYS) is discretized the inner zone and using the temperatures as boundary conditions. Solving the system defined for the equations according to the mesh defined, temperature, velocities and densities are determined. The results allowing to identify what is the behavior inside of the dryer and how the drying process happens. This way to study the drying process can be useful when the behavior inside of the chamber wants to be evaluated. In addition, this work can be useful in the design of solar dryers because allows to know how the trays can be placed to take advantage in the best way the solar energy in solar dryers.
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Mutabilwa, Philemon, and Kevin N. Nwaigwe. "Design, Construction and CFD Modeling of a Banana-Solar Dryer With Double Pass Solar Air Collector." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1614.

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Abstract A work on the design, construction and computational fluid dynamics modelling of a solar dryer with a double pass solar air collector is presented. Using fundamental relationships, an indirect solar dying system for drying banana was designed and constructed. The system consists of a drying chamber and a double pass solar collector (DPSC), connected together with a flexible aluminum pipe. The system features a unique arrangement, as the drying chamber is underneath the double pass solar collector, and the solar collector itself can be adjusted to an angle of 0° up to 35° the maintenance or research purpose. The DPSC has five longitudinal fins, lying parallel with air flow. The solar dryer is incorporated with a convective DC fan that sucks hot air from the solar collector on to the drying chamber. The DPSC achieved an optimal peak outlet temperature of 345K with a maximum operational efficiency of 72.5%. A computational fluid dynamic (CFD) model is achieved for prediction of the dryer temperature and 3D airflow distribution within the dryer unit using ANSYS 18.2. The CFD model was validated using experimental data. The developed dryer demonstrated improved efficiency over similar dryers, and this is attributable to the unique arrangement of component parts.
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Gaikwad, S. S., A. D. Devmare, N. A. Karvar, K. H. Chavan, and S. A. Gavali. "Fabrication and Performance Analysis of Wooden Solar Dryer." In National Conference on Relevance of Engineering and Science for Environment and Society. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.118.19.

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Industrial development artificial mechanical drying came into practice. This process is energy intensive and expensive. It increases product cost. The efforts to enhance sun drying have led to solar drying. Solar dryers control the drying process. Also protect agricultural foods from damage by insect pests dust and rain. The solar drying system utilizes solar power to heat up air and to dry any food substance. This is useful in reducing wastage of agricultural product and helps in preservation of agricultural product. The restrictions of the natural sun drying exposure to direct sunlight, liability to pests and rodents lack of proper monitoring. The intensify cost of the mechanical dryer a solar is developed to cater for this disadvantage. In the dryer, the heated air from a separate solar dish is skilled a grain bed, and at an equivalent time, the drying cabinet absorbs solar power directly through the transparent walls and roof.
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Kavya, V. S., and A. S. Ramana. "Recent Trends in PCM-Integrated Solar Dryers." In The International Conference on Processing and Performance of Materials (ICPPM 2023). Basel Switzerland: MDPI, 2024. http://dx.doi.org/10.3390/engproc2024061006.

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Luttrell, Jeff, and Dereje Agonafer. "Solar Assisted Household Clothes Dryer." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90095.

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Energy savings for domestic appliances have been an emphasis for several years. The efficiencies of several appliances have improved dramatically as a result of this attention. Refrigerator, water heater, and washing machine energy consumptions have been reduced. One appliance has not experienced significant improvement, the clothes dryer. Typical household clothes dryers use large amounts of electricity or natural gas to heat air that is circulated with the clothes. The energy to heat the air is a function of the amount of air and heat needed to remove moisture from the clothes. Using solar heat to augment or replace the other energy sources can provide significant energy savings. Conventional house construction includes features which collect and concentrate solar energy in the air occupying the attic space. Typical home design provides a roof which functions as a large area solar energy collector. Many roofing materials have solar absorption of 80% or more. Insulation of the roof decking is uncommon so that absorbed solar heat conducts through and heats the attic air. Through simple, low-cost ducting and minor modification of a clothes dryer air inlet, this energy resource becomes available for use. This study evaluates the potential energy savings of using solar-heated attic air as a clothes dryer air source. Considering house construction as well as seasonal and regional climate variations, attic air can augment and may fully replace utility energy as the heat source for drying air during daylight hours when solar energy is incident on the roof. The energy savings can be up to 3.5 kilowatt hours (or the heating equivalent for natural gas) for each dryer load.
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Kemal OZTURK, Harun, and Hande MUTLU OZTURK. "Drying of Apricot with Solar Energy in Cabin Type Dryers." In 5th International Conference on Modern Approaches in Science, Technology & Engineering. Acavent, 2019. http://dx.doi.org/10.33422/5th-ste.2019.08.445.

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Abdenouri, Naji, H. El Ferouali, M. Gharafi, A. Zoukit, and S. Doubabi. "Hybrid solar-gas-electric dryer optimization with genetic algorithms." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7521.

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To promote the hybrid solar dryers for use even under unfavorable weather and to overcome the intermittance state issue, the energy consumption should be optimized and the response time should be reduced. This work concerns a drying chamber connected to a solar absorber where the air can be heated also by combustion of gas and by electric resistance. To optimize the control parameters, an evolutionary optimization algorithm simulating natural selection was used. It was combined with a predictive model based on the artificial neural networks (ANN) technique and used as a fitness function for the genetic algorithm (GA). The ANN is a learning algorithm that needs training through a large dataset, which was collected using CFD simulation and experimental data. Then a GA was executed in order to optimize two objectives: The energy consumption and the t95% response time in which the drying chamber temperature reaches its set point (60°C). After optimization, a 30% decrease of the t95% response time, and 20% decrease of the energy consumption were obtained. Keywords: hybrid solar dryer; artificial neural network; temperature regulation; energy consumption; genetic algorithm.
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Nikhil, Patil, Mane Dipak, and Manoj J. Deshmukh. "Electronic Based Solar Dryer." In National Conference on Relevance of Engineering and Science for Environment and Society. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.118.29.

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Drought of fruits and vegetables is a promising food processing technology that increases shelf life of products for almost a year. It is a value of process that can save the losses of seasonal agriculture products. The Solar dryers can be used to carry food dehydration without on electricity. India is most of agriculture-dependent country. Fruits and vegetables are an basically part of human diet providing micronutrients, vitamins, enzymes, and minerals. Most fruits and vegetables it content moisture and water activity. This makes it is vulnerable to bug and other spoilages due to biochemical reactional, such as enzymatic activity, respiration, and senescence. Then, preventive measures are taken to lower water activity; drying or dehydration is we such one method. Drying is a process of mostly used removal of water from the food to in biochemical processes and microbial growth. Drying increases the service life of the product, so that it can be available during off season.
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Khanzode, Anand U., and Sachin R. Karale. "Overview of Solar Air Drying Systems in India and His Vision of Future Developments." In ASME 2006 International Solar Energy Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/isec2006-99116.

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Solar Air Drying is one of the oldest method of food preservation. For several thousand years people have been preserving grapes, herbs, Potato’s, corn, milk, fruits, vegetables, spices, meat and fish by drying. Until canning was developed at the end of the 18th century, drying was virtually the only method of food preservation. It is still the most widely used method. Solar Drying is an excellent way to preserve food and solar food dryers are an appropriate food preservation technology for a sustainable world. This technology makes it possible to dehydrate and preserve food professionally without compromising on quality, color, texture, enzymes, vitamins, taste and nutritional values of foods in the process. Food scientists have found that by reducing the moisture content of food to between 10 and 20%, bacteria, yeast, mold and enzymes are all prevented from spoiling it. India is blessed with an abundance of sunlight, water and biomass. Vigorous efforts during the past two decades are now bearing fruit as people in all walks of life are more aware of the benefits of renewable energy, especially solar energy in villages and in urban or semi-urban centers of India. Industries that can benefit from application of solar energy to heat air are Food, Textiles, Dairies, Pharma and Chemical. This paper reviews the present scenario of Solar Air Dryer and strategies for future developments in India.
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Ramli, Ismail, Denny Cipta, and Hamka Munir. "Fuzzy Logic Control System Implementation on Solar and Gas Energy Dryers." In International Conference on Applied Science and Technology on Engineering Science. SCITEPRESS - Science and Technology Publications, 2021. http://dx.doi.org/10.5220/0010950300003260.

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Reports on the topic "Solar dryers"

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Opportunities and drivers for SME agribusinesses to reduce food loss in Africa and Asia. Commercial Agriculture for Smallholders and Agribusiness (CASA), 2023. http://dx.doi.org/10.1079/20240191175.

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Climate change, conflict, and the COVID-19 pandemic and its aftermath have caused a sharp increase in food insecurity globally. Reducing food loss - a decrease in the quantity and/or quality of food that takes place from production through to processing - in places where food insecurity is most severe has the potential to be a win-win for food security, climate outcomes, and for commercially driven agribusinesses. This report reviews the common drivers of food loss in sub-Saharan Africa and South Asia, which include inadequate storage, lack of cold chain, and poor post-harvest and distribution practices. It then highlights five technologies or approaches which have the potential to address food loss, and which are appropriate for agricultural small and medium-sized enterprises (agri-SMEs) operating in much of sub-Saharan Africa and South Asia, which face particular challenges (e.g. an unreliable electrical grid and fragmented value chains). Finally, the report highlights the main barriers to adoption and scale for these technologies and approaches, and identifies opportunities for governments, development partners, investors, and technology manufacturers to improve their uptake among agri-SMEs. The five technologies and approaches covered in this report are as follows: Decentralization of processing using solar dryers: The decentralization of primary food processing, in which some portion of value addition is undertaken close to the farm gate by farmers or SMEs, can have multiple benefits, including reducing food loss, lowering transport costs, and increasing rural incomes. Solar drying technology can enable this model, particularly in areas where there is a tradition of sun drying fruits and vegetables and there is a viable domestic or regional market for these products. Successful models typically involve an agribusiness off-taker who works with farmers and SME producers, providing technology and services (e.g., guaranteed off-take, training etc.) that ensure the production of high-quality produce. Hermetic storage (e.g. bags and cocoons): This maturing technology is increasingly available in local markets and represents a potentially easy-to-implement solution which could help to substantially address food loss during storage - where most loss occurs - for key staple grains. Cost and usage remain challenges for smallholders, with greater potential for small- to medium-scale traders and aggregators in rural areas with limited storage infrastructure. By creating a hypoxic environment around the produce, these solutions can achieve 100% insect mortality and reduce the growth of mould and aflatoxins. Bags are more appropriate for agri-SMEs involved in distribution, whereas cocoons (i.e. storage containers consisting of two plastic halves joined together by an airtight zip) are more useful for those storing large volumes for periods of six months or longer. Off-grid cold storage (e.g. solar-powered cold rooms): Innovative technologies and delivery mechanisms are still being tested in markets in India, Nigeria, and Kenya. Despite the high upfront cost, there are several examples of agri-SMEs and co-operatives achieving payback periods of as little as two years across a range of fruit and vegetable value chains, with returns driven by reductions in food loss and improved pricing due to better quality of the produce. Cooling as a service business models also offer the potential to reach smaller agri-SMEs and micro-entrepreneurs operating in informal rural and peri-urban value chains, but their application is limited to high-value crops that are generally out of the reach of the rural poor. Agri-ecommerce platforms: Agri-ecommerce platforms are a well-developed technology that aims to reduce food loss by improving the availability of information on market demand for farmers. Technology providers can also engage in logistics, warehousing, and quality control, taking collection of the produce from rural-based hubs, combining it at a central packing house, and delivering to urban retailers. Models of this kind have scaled more effectively in South Asia than sub-Saharan Africa, where they are constrained by poor road and logistics infrastructure. Waste-to-value approaches: Waste-to-value or circular economy approaches have the potential to reduce food loss by utilizing bruised or damaged fruits and vegetables which are unable to be sold as intended as inputs into other food products. Although the application of these approaches to the production of products such as condiments and oils is popular, they are unlikely to have a material impact on food security. However, models such as using black soldier fly larvae (BSFL) to produce animal feed (after consuming the food waste) are more promising, with a range of related technologies and business models operating in markets in both Africa and Asia. The main barriers to the success and scaling up of these technologies and approaches include a lack of knowledge and awareness of their commercial benefits, a lack of finance for manufacturers and agri-SME customers, a need for further research and development (R&D) and business model innovation (e.g. to bring down cost), and a lack of supportive policies and regulatory frameworks. Policymakers, development partners, investors, and the private sector can all play important roles in addressing these barriers.
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