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Numerical analysis and validation of a natural convection mix-mode solar dryer for drying red chilli under variable conditions

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  • Simo-Tagne, Merlin
  • Ndukwu, Macmanus Chinenye
  • Zoulalian, André
  • Bennamoun, Lyes
  • Kifani-Sahban, Fatima
  • Rogaume, Yann

Abstract

The objective of this paper is to model a natural convection mix-mode solar dryer (NCMMSD) for drying agricultural products in an environment with short sunshine duration. The solar dryer was used to dry red chilli and was operating under the climate of the coastal area of South Eastern Nigeria characterized by low solar radiation intensity with a short duration of sunshine hours. The model took into consideration the thermophysical properties of the drying air and dried red chilli. The simultaneous heat and mass transfer equations were solved using the fourth-order Runge-Kutha method. The numerical solution allows for the determination of temperature and relative humidity of drying air at different points within the dryer as well as the moisture profile of the dried product. The experimental values of moisture ratios, temperature, and relative humidity during the mix-mode solar drying process with and without NaCl were used to validate the proposed model. Numerical simulation results were in close agreement with experimental results. The present model can serve as good reference bases to explain the drying phenomenon of mix-mode solar drying of other agricultural products when necessary thermophysical properties of these products are known. Using this model, the potential of mitigating gross fossil (coal) CO2 in Africa is annually estimated to 1280148 tons of CO2.

Suggested Citation

  • Simo-Tagne, Merlin & Ndukwu, Macmanus Chinenye & Zoulalian, André & Bennamoun, Lyes & Kifani-Sahban, Fatima & Rogaume, Yann, 2020. "Numerical analysis and validation of a natural convection mix-mode solar dryer for drying red chilli under variable conditions," Renewable Energy, Elsevier, vol. 151(C), pages 659-673.
    • Handle: RePEc:eee:renene:v:151:y:2020:i:c:p:659-673
    DOI: 10.1016/j.renene.2019.11.055
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    Cited by:

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    2. Saeed Abdul-Ganiyu & David A Quansah & Emmanuel W Ramde & Razak Seidu & Muyiwa S. Adaramola, 2020. "Investigation of Solar Photovoltaic-Thermal (PVT) and Solar Photovoltaic (PV) Performance: A Case Study in Ghana," Energies, MDPI, vol. 13(11), pages 1-17, May.
    3. Sivakumar, S. & Velmurugan, C. & Dhas, D.S. Ebenezer Jacob & Solomon, A. Brusly & Dev Wins, K. Leo, 2020. "Effect of nano cupric oxide coating on the forced convection performance of a mixed-mode flat plate solar dryer," Renewable Energy, Elsevier, vol. 155(C), pages 1165-1172.
    4. Baher M. A. Amer & Houssam Chouikhi, 2020. "Smartphone Application Using a Visual Programming Language to Compute Drying/Solar Drying Characteristics of Agricultural Products," Sustainability, MDPI, vol. 12(19), pages 1-30, October.
    5. Ewelina Radomska & Łukasz Mika & Karol Sztekler & Wojciech Kalawa & Łukasz Lis & Kinga Pielichowska & Magdalena Szumera & Paweł Rutkowski, 2023. "Experimental and Theoretical Investigation of Single-Slope Passive Solar Still with Phase-Change Materials," Energies, MDPI, vol. 16(3), pages 1-29, January.
    6. Simo-Tagne, Merlin & Tamkam Etala, Hermann Dimitri & Tagne Tagne, Ablain & Ndukwu, Macmanus Chinenye & El Marouani, Maryam, 2022. "Energy, environmental and economic analyses of an indirect cocoa bean solar dryer: A comparison between natural and forced convections," Renewable Energy, Elsevier, vol. 187(C), pages 1154-1172.
    7. Macmanus Chinenye Ndukwu & Lyes Bennamoun & Merlin Simo-Tagne, 2021. "Reviewing the Exergy Analysis of Solar Thermal Systems Integrated with Phase Change Materials," Energies, MDPI, vol. 14(3), pages 1-26, January.

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