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Experimental performance of an indirect solar dryer with hot air recycling for mango drying.

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Title: Experimental performance of an indirect solar dryer with hot air recycling for mango drying.
Authors: Mbaye, Bou Counta1,2 (AUTHOR) boucounta.mbaye@ucad.edu.sn, Bideau, Pascal Le3 (AUTHOR), Coly, Mamadou Lamine1 (AUTHOR), Thiam, Omar Ngor1 (AUTHOR), Magueresse, Anthony3 (AUTHOR), Sambou, Vincent2 (AUTHOR), Sow, Mamadou Lamine1 (AUTHOR)
Source: Solar Energy. Aug2026, Vol. 314, pN.PAG-N.PAG. 1p.
Subjects: Solar food drying, Drying apparatus, Food dehydration, Energy consumption
Abstract: • Experimental and modelled study of indirect solar drying of mango slices. • Forced convection dryer with hot air recycling improves heat and mass transfer. • Effective diffusivity ranges from 3.54 × 10−11 to 1.22 × 10−10 m2·s−1. • Midilli and Kucuk model best fits the drying kinetics (R2 ≈ 0.996). • Improved energy efficiency and product quality over open-air drying. This study investigates the experimental performance and modelling of indirect solar drying of mango slices using a forced convection solar dryer equipped with a hot air recycling system. The results reveal a strong coupling between solar irradiance, drying air temperature, and moisture removal kinetics. Under a maximum solar irradiance of 1000–1010 W·m−2, the air temperature inside the drying chamber reached 56–58 °C, creating a favourable thermal gradient of 5–7 °C and sustaining an efficient evaporation rate. Effective moisture diffusivity ranged from 3.54 × 10−11 to 1.22 × 10−10 m−2 s−1, consistent with values reported for tropical food products. Activation of the hot air recycling system ensured uniform thermal and hygrometric conditions within the drying chamber, improving both energy efficiency and product quality. Among the evaluated thin-layer drying models, the Midilli and Kucuk model provided the best fit to experimental data (R2 ≈ 0.996; χ2 ≈ 3.3 × 10-4), confirming its suitability for describing the solar drying kinetics of tropical fruits. The final dried product exhibited a homogeneous texture, minimal shrinkage, and excellent colour retention, highlighting the advantages of indirect solar drying over conventional open-air methods. A joint analysis of thermal efficiency, heat transfer (hc, hm) and exergetic efficiency confirms that air recirculation optimises the process. Indeed, this approach improves thermal and airflow uniformity, stabilises heat transfer and provides a better understanding of heat-mass-energy interactions. As such, it enables more effective control of solar drying. [ABSTRACT FROM AUTHOR]
Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 194427107
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Experimental performance of an indirect solar dryer with hot air recycling for mango drying.
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  Data: <searchLink fieldCode="AR" term="%22Mbaye%2C+Bou+Counta%22">Mbaye, Bou Counta</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> boucounta.mbaye@ucad.edu.sn</i><br /><searchLink fieldCode="AR" term="%22Bideau%2C+Pascal+Le%22">Bideau, Pascal Le</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Coly%2C+Mamadou+Lamine%22">Coly, Mamadou Lamine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thiam%2C+Omar+Ngor%22">Thiam, Omar Ngor</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Magueresse%2C+Anthony%22">Magueresse, Anthony</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sambou%2C+Vincent%22">Sambou, Vincent</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sow%2C+Mamadou+Lamine%22">Sow, Mamadou Lamine</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Solar+Energy%22">Solar Energy</searchLink>. Aug2026, Vol. 314, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Solar+food+drying%22">Solar food drying</searchLink><br /><searchLink fieldCode="DE" term="%22Drying+apparatus%22">Drying apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Food+dehydration%22">Food dehydration</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+consumption%22">Energy consumption</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Experimental and modelled study of indirect solar drying of mango slices. • Forced convection dryer with hot air recycling improves heat and mass transfer. • Effective diffusivity ranges from 3.54 × 10−11 to 1.22 × 10−10 m2·s−1. • Midilli and Kucuk model best fits the drying kinetics (R2 ≈ 0.996). • Improved energy efficiency and product quality over open-air drying. This study investigates the experimental performance and modelling of indirect solar drying of mango slices using a forced convection solar dryer equipped with a hot air recycling system. The results reveal a strong coupling between solar irradiance, drying air temperature, and moisture removal kinetics. Under a maximum solar irradiance of 1000–1010 W·m−2, the air temperature inside the drying chamber reached 56–58 °C, creating a favourable thermal gradient of 5–7 °C and sustaining an efficient evaporation rate. Effective moisture diffusivity ranged from 3.54 × 10−11 to 1.22 × 10−10 m−2 s−1, consistent with values reported for tropical food products. Activation of the hot air recycling system ensured uniform thermal and hygrometric conditions within the drying chamber, improving both energy efficiency and product quality. Among the evaluated thin-layer drying models, the Midilli and Kucuk model provided the best fit to experimental data (R2 ≈ 0.996; χ2 ≈ 3.3 × 10-4), confirming its suitability for describing the solar drying kinetics of tropical fruits. The final dried product exhibited a homogeneous texture, minimal shrinkage, and excellent colour retention, highlighting the advantages of indirect solar drying over conventional open-air methods. A joint analysis of thermal efficiency, heat transfer (hc, hm) and exergetic efficiency confirms that air recirculation optimises the process. Indeed, this approach improves thermal and airflow uniformity, stabilises heat transfer and provides a better understanding of heat-mass-energy interactions. As such, it enables more effective control of solar drying. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solar Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.solener.2026.114694
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Solar food drying
        Type: general
      – SubjectFull: Drying apparatus
        Type: general
      – SubjectFull: Food dehydration
        Type: general
      – SubjectFull: Energy consumption
        Type: general
    Titles:
      – TitleFull: Experimental performance of an indirect solar dryer with hot air recycling for mango drying.
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            NameFull: Mbaye, Bou Counta
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            NameFull: Bideau, Pascal Le
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            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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              Value: 314
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