Review of solar dryers for agricultural products in Asia and Africa: An innovation landscape approach

Udomkun, Patchimaporn; Romuli, Sebastian; Schock, Steffen; Mahayothee, Busarakorn; Sartas, Murat; Wossen, Tesfamicheal; Njukwe, Emmanuel; Vanlauwe, Bernard; Müller, Joachim

doi:10.1016/j.jenvman.2020.110730

Cited by 182 publications

(85 citation statements)

References 102 publications

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“…Solar drying under controlled conditions of temperature and moisture removing rate confirms perfect drying and the required quality of the final product. However, only a few designs of solar dryers are deployed on scales other than demo projects or used at the industrial level [19,40]. The classification of solar dryers for agricultural and marine products is mainly performed according to the size of the dryer, design of the system, and solar energy consumption mode.…”

Section: Solar-assisted Dryers For Agricultural and Marine Productsmentioning

confidence: 99%

“…In the open-sun-drying process, substantial losses occur because of numerous factors including birds, rodents, insects, and micro-organisms, while unpredicted storms or rain worsen the condition. Further, excess/insufficient drying; impurities due to external contaminants such as dirt, dust, insects, and micro-organisms; and color fading by ultraviolet (UV) radiation are characteristics of open-sun-drying [40]. Additionally, open-sundrying is a sluggish process that can lead to significantly huge losses.…”

Section: Open Sun Dryingmentioning

confidence: 99%

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

Gorjian

Hosseingholilou

Jathar³

et al. 2021

Sustainability

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The food industry is responsible for supplying the food demand of the ever-increasing global population. The food chain is one of the major contributors to greenhouse gas (GHG) emissions, and global food waste accounts for one-third of produced food. A solution to this problem is preserving crops, vegetables, and fruits with the help of an ancient method of sun drying. For drying agricultural and marine products, several types of dryers are also being developed. However, they require a large amount of energy supplied conventionally from pollutant energy sources. The environmental concerns and depletion risks of fossil fuels persuade researchers and developers to seek alternative solutions. To perform drying applications, sustainable solar power may be effective because it is highly accessible in most regions of the world. Greenhouse dryers (GHDs) are simple facilities that can provide large capacities for drying agricultural products. This study reviews the integration of GHDs with different solar technologies, including photovoltaic (PV), photovoltaic-thermal (PVT), and solar thermal collectors. Additionally, the integration of solar-assisted greenhouse dryers (SGHDs) with heat pumps and thermal energy storage (TES) units, as well as their hybrid configuration considering integration with other renewable energy sources, is investigated to improve their thermal performance. In this regard, this review presents and discusses the most recent advances in this field. Additionally, the economic analysis of SGHDs is presented as a key factor to make these sustainable facilities commercially available.

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Section: Solar-assisted Dryers For Agricultural and Marine Productsmentioning

confidence: 99%

Section: Open Sun Dryingmentioning

confidence: 99%

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

Gorjian

Hosseingholilou

Jathar³

et al. 2021

Sustainability

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“…Pengeringan matahari adalah salah satu teknologi yang paling efisien dan hemat biaya, terbarukan, dan berkelanjutan untuk dilestarikan produk pertanian di negara-negara Asia dan Afrika sub-Sahara (SSA) (Udomkun et al, 2020). Oleh karena itu pengukuran iradiasi surya sangat penting dilakukan karena berpengaruh terhadap tinggi rendahnya temperatur dalam ruang pengering tipe Green House Effect (GHE) Vent Dryer.…”

Section: Iradiasi Suryaunclassified

Uji kinerja Alat Pengering Ikan Tipe Green-House Effect (GHE) Vent Dryer

Yasar

Agustina

Mustaqimah

et al. 2020

JRTP

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Abstrak. Diantara permasalahan yang dihadapi oleh sektor usaha perikanan ialah belum efisiennya teknis pengelolaan dan tidak stabilnya kontinuitas produksi. Hal ini disebabkan oleh kurangnya sarana prasarana untuk mengolah ikan serta sistem pemasaran ikan segar yang masih konvensional, sehingga cepat membusuk apabila tidak diolah lebih lanjut. Penanganan dan pengolahan yang cepat dan tepat diperlukan untuk mengurangi resiko pembusukan dan dapat meningkatkan nilai jual hingga sampai kepada konsumen. Salah satu teknologi untuk meningkatkan masa simpan ikan ialah dengan cara proses pengeringan. Sebuah alat pengering ikan Green-House Effect (GHE) telah dikembangkan. Pengujian dan analisis alat pengering untuk ikan tersebut disajikan dalam makalah ini. Pengering surya ini menambahkan ventilator berupa exhaust fan guna memaksimalkan proses sirkulasi udara di dalam ruang pengeringan. Parameter yang diukur dalam pengujian ini adalah distribusi suhu, kelembaban relatif, iradiasi dan pengukuran kecepatan udara. Hasil penelitian menunjukan bahwa temperatur di dalam ruang pengering terlihat lebih tinggi yaitu 67°C dibandingkan dengan temperatur di lingkungan karena sifat absorber yang mampu menyerap panas. Sementara itu kelembaban relatif di dalam ruang pengering lebih rendah jika dibandingkan dengan kelembaban di lingkungan yaitu sebesar 30,1%. Nilai iradiasi surya yang diperoleh sangat berfluktuasi dengan nilai tertinggi adalah sebesar 180,6 W/m2. Kecepatan udara di dalam ruang pengering surya lebih stabil dibandingkan dengan kecepatan udara lingkungan karena adanya penambahan ventilator berupa exhaust fan. Hal inilah yang menyebabkan proses pengeringan menjadi lebih cepat.Performance of Green House Effect (GHE) Vent Dryer for Fish DryingAbstract. The problems that occur in the fishery business sector are inefficient and unstable continuity of production. The reasons for this include the lack of infrastructure for processing fish and also the very limited marketing of fresh fish due to its fast-rotting nature if not further processed. Fast and precise handling and processing are needed to reduce the risk of spoilage. One of the technologies to increase the shelf life of fish is the drying process. A greenhouse effect vent dryer type fish dryer has been developed. The testing and analysis of the dryer for these fish are presented in this paper. This solar dryer adds a ventilator in the form of an exhaust fan to maximize air circulation in the drying chamber. The parameters measured in this test are temperature distribution, relative humidity distribution, solar irradiation, and air velocity measurement. The results show that the temperature in the drying chamber is 67 ⸰C higher than the temperature in the environment due to the nature of the absorber which can absorb heat. Meanwhile, the relative humidity in the drying chamber was lower than the humidity in the environment, which was 30.1%. The value of solar irradiation obtained fluctuates where the highest irradiation is 180.6 W / m2. The air velocity in the solar dryer is more stable than the ambient airspeed due to the addition of a ventilator in the form of an exhaust fan. This causes the drying process to take place faster.

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“…The solar drying is known to be the inexpensive technique for drying and preserving food products. Using solar energy to dry agricultural products has become potentially a viable substitute for fossil fuel in countries where solar radiation is abundant [3][4][5]. Pineapple considers as one of the important local fruits of Malaysia has waste during harvest and shipping.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Drying Pineapple with An Active Indirect Solar Tunnel Dryer in Malaysia

Sotoodeh

Sopian

Ibrahim

2021

ARFMTS

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Abundant sunshine and tropical climate of Malaysia have made pineapple a suitable fruit to be grown in this country. However, to have longer shelf-life, lighter weight for transportation and less storage space, drying of pineapple has been a common preservation method in this country. Open-sun drying used to be most common method of preserving agricultural products. Nevertheless, due to the disadvantages of open sun drying method, solar drying technology has become an alternative method of drying vegetables, fruits, spices, herbs etc. The main purpose of this paper is to evaluate the performance of active solar tunnel dryer (ASTD) for drying sliced pineapples. The air circulation system in this dryer is based on forced convection system. In active solar tunnel dryer inlet airflow temperature was gained by corrugated absorber plate. During the experiment minimum, maximum and average of absorber thermal efficiency were 13.1% and 24.4%, and 19.8 % respectively. The inlet temperature range was between 260C to 380C, the escalated temperature range was between 340C to 750C on the absorber outlet. Relative humidity (RH) experienced changes due to irradiance intensity, the RH reduced when passed through the absorber plate. The average inlet humidity was 54% while average outlet humidity was 36%. During 9 hours of drying process, pineapple moisture content reduced from 89% to 12.5% and its weight decreased from 5 kg to 0.6 2kg. The peak sun hours were 5.7 hours, and loading density was 1.51 kg/m2.

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Review of solar dryers for agricultural products in Asia and Africa: An innovation landscape approach

Cited by 182 publications

References 102 publications

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

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

Uji kinerja Alat Pengering Ikan Tipe Green-House Effect (GHE) Vent Dryer

Experimental Studies of Drying Pineapple with An Active Indirect Solar Tunnel Dryer in Malaysia

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