Solar drying is one of the most important processes of preserving agricultural products. This review paper focused mainly on the enhancement of efficiency a solar drying system. The establishment of different techniques and factors, which may affect the performance of solar dryers, helps to improve solar dryers’ effectiveness. Different types of solar dryers were described here; moreover, various performance analyses of solar drying systems (SDSs) were presented. Factors and techniques for improving efficiency of solar dryers were discussed as well. The effect of operating conditions, geometrical conditions, adding of reflectors, heat exchanger, heat pump, photovoltaic source, air circulation mode, and phase change material (PCM) on the efficiency of a solar drying system were studied and discussed. Results showed that climatic conditions such as ambient temperature and solar radiation have an important influence on the solar dryer performance. The chimney integrated in solar dryer increases the buoyant force applied on the air stream to maintain a greater air flow velocity, which removes one side of moisture. The concentrators found to be effective in reducing the drying time by increasing the air temperature inside the dryer. Photovoltaic panels provides electricity source to run electrical components such as the fan to provide a forced air circulation that removes more moisture from the product compared with the natural convection or the heat pump to ensure the drying process at night. PCMs store the thermal energy during sunshine hours and release it after sunset, which can reduce the heat losses and improve the thermal efficiency of the drying system.
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October 2019
Review Articles
Improvement of the Thermal Performance of Solar Drying Systems Using Different Techniques: A Review
Messaoud Sandali,
Messaoud Sandali
1
Laboratoire de développement des énergies nouvelles et renouvelables en zones arides (LENREZA),
Ouargla 30000,
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie mécanique,
Ouargla 30000,
e-mail: sandalimessaoud@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: sandalimessaoud@gmail.com
1Corresponding author.
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Abdelghani Boubekri,
Abdelghani Boubekri
Laboratoire de développement des énergies nouvelles et renouvelables en zones arides (LENREZA),
Ouargla 30000,
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie mécanique,
Ouargla 30000,
e-mail: abdelgh@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: abdelgh@gmail.com
Search for other works by this author on:
Djamel Mennouche
Djamel Mennouche
Laboratoire de développement des énergies nouvelles et renouvelables en
zones arides (LENREZA),
Ouargla 30000,
zones arides (LENREZA),
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie des procédées,
Ouargla 30000,
e-mail: mennouche@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: mennouche@gmail.com
Search for other works by this author on:
Messaoud Sandali
Laboratoire de développement des énergies nouvelles et renouvelables en zones arides (LENREZA),
Ouargla 30000,
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie mécanique,
Ouargla 30000,
e-mail: sandalimessaoud@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: sandalimessaoud@gmail.com
Abdelghani Boubekri
Laboratoire de développement des énergies nouvelles et renouvelables en zones arides (LENREZA),
Ouargla 30000,
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie mécanique,
Ouargla 30000,
e-mail: abdelgh@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: abdelgh@gmail.com
Djamel Mennouche
Laboratoire de développement des énergies nouvelles et renouvelables en
zones arides (LENREZA),
Ouargla 30000,
zones arides (LENREZA),
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
;Faculté des sciences appliquées, Département de génie des procédées,
Ouargla 30000,
e-mail: mennouche@gmail.com
Université Kasdi Merbah Ouargla
,Ouargla 30000,
Algeria
e-mail: mennouche@gmail.com
1Corresponding author.
Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering: Including Wind Energy and Building Energy Conservation. Manuscript received September 7, 2018; final manuscript received April 17, 2019; published online May 8, 2019. Assoc. Editor: Ming Qu.
J. Sol. Energy Eng. Oct 2019, 141(5): 050802 (11 pages)
Published Online: May 8, 2019
Article history
Received:
September 7, 2018
Revision Received:
April 17, 2019
Accepted:
April 22, 2019
Citation
Sandali, M., Boubekri, A., and Mennouche, D. (May 8, 2019). "Improvement of the Thermal Performance of Solar Drying Systems Using Different Techniques: A Review." ASME. J. Sol. Energy Eng. October 2019; 141(5): 050802. https://doi.org/10.1115/1.4043613
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