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An Experimental Comparative Study of Large-Sized Direct Solar Fryers for Injera Baking Applications

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  • Mesele Hayelom Hailu

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes v 1B, Varmeteknisk lab, Floor No. 3, NO-7034 Trondheim, Norway
    School of Mechanical & Industrial Engineering, Ethiopian Institute of Technology-Mekelle (EiT-M), Mekelle University, Mekelle P.O. Box 231, Ethiopia)

  • Mulu Bayray Kahsay

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes v 1B, Varmeteknisk lab, Floor No. 3, NO-7034 Trondheim, Norway
    School of Mechanical & Industrial Engineering, Ethiopian Institute of Technology-Mekelle (EiT-M), Mekelle University, Mekelle P.O. Box 231, Ethiopia)

  • Asfafaw Haileslassie Tesfay

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes v 1B, Varmeteknisk lab, Floor No. 3, NO-7034 Trondheim, Norway
    School of Mechanical & Industrial Engineering, Ethiopian Institute of Technology-Mekelle (EiT-M), Mekelle University, Mekelle P.O. Box 231, Ethiopia)

  • Ole Jørgen Nydal

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes v 1B, Varmeteknisk lab, Floor No. 3, NO-7034 Trondheim, Norway)

Abstract

This research experimentally demonstrates the practicability of using large-sized direct solar frying as an alternative technology for the predominantly biomass-based injera baking method. The system was designed and developed with fryers 40, 50, and 55 cm in diameter and two operational options: continuous mode and alternating mode. Extensive experimental testing was conducted on each prototype to demonstrate solar frying and determine the relative performance. The findings indicate that the 2 kW heating capacity of the 40 cm-sized solar fryer model conducted baking processes at a relatively lower system temperature in both application modes compared to the larger-sized fryers. As a result, this system maintained a consistent average fryer temperature distribution and shorter initial heating time, without the requirement of a reheating process during the subsequent baking cycles. The experimental testing also demonstrated that alternating-mode applications were more practical for the 40 cm-sized fryers than for the larger ones. Overall, direct solar frying is more efficient and convenient for the 40 cm-sized solar fryers. In contrast, the larger-sized systems required a larger fryer thermal storage capacity coupled with larger-size solar concentrators to maintain equivalent stable operational conditions, conversely leading to a lack of application simplicity and higher system costs.

Suggested Citation

  • Mesele Hayelom Hailu & Mulu Bayray Kahsay & Asfafaw Haileslassie Tesfay & Ole Jørgen Nydal, 2024. "An Experimental Comparative Study of Large-Sized Direct Solar Fryers for Injera Baking Applications," Energies, MDPI, vol. 17(19), pages 1-16, October.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:19:p:4949-:d:1491539
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    References listed on IDEAS

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    1. Cuce, Erdem & Cuce, Pinar Mert, 2013. "A comprehensive review on solar cookers," Applied Energy, Elsevier, vol. 102(C), pages 1399-1421.
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