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Proposal of a non-linear curve for reporting the performance of solar cookers

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  • Ruivo, Celestino Rodrigues
  • Apaolaza-Pagoaga, Xabier
  • Coccia, Gianluca
  • Carrillo-Andrés, Antonio

Abstract

Performance parameters of solar cookers have conventionally been determined by assuming a linear trend between the cooker power and the difference between load temperature and ambient air temperature. This approach may not be convenient for some solar cooker designs. In the present work, the suitability of a non-linear regression derived from fitting the measured load temperature to a second order exponential polynomial was investigated and compared with the linear regression. Both regressions were compared with the corresponding experimental curves of a panel cooker and a box cooker. In the case of the panel cooker, the linear trend of the experimental plot was confirmed over a large period of the conducted test. Minor deviations from the experimental data were observed only at the beginning and at the end of the test. On the contrary, in the box solar cooker, significant deviations between the linear regression plot and the experimental points were observed, while smaller deviations were obtained using the non-linear regression. Thus, the proposed method can be seen as a promising approach that should be considered when updating the existing procedures for testing and reporting the performance of solar cookers.

Suggested Citation

  • Ruivo, Celestino Rodrigues & Apaolaza-Pagoaga, Xabier & Coccia, Gianluca & Carrillo-Andrés, Antonio, 2022. "Proposal of a non-linear curve for reporting the performance of solar cookers," Renewable Energy, Elsevier, vol. 191(C), pages 110-121.
  • Handle: RePEc:eee:renene:v:191:y:2022:i:c:p:110-121
    DOI: 10.1016/j.renene.2022.04.026
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    1. Lahkar, Pranab J. & Bhamu, Rajesh K. & Samdarshi, S.K., 2012. "Enabling inter-cooker thermal performance comparison based on cooker opto-thermal ratio (COR)," Applied Energy, Elsevier, vol. 99(C), pages 491-495.
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    4. Apaolaza-Pagoaga, Xabier & Carrillo-Andrés, Antonio & Ruivo, Celestino Rodrigues, 2021. "New approach for analysing the effect of minor and major solar cooker design changes: Influence of height trivet on the power of a funnel cooker," Renewable Energy, Elsevier, vol. 179(C), pages 2071-2085.
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    6. Ruivo, Celestino Rodrigues & Apaolaza-Pagoaga, Xabier & Di Nicola, Giovanni & Carrillo-Andrés, Antonio, 2022. "On the use of experimental measured data to derive the linear regression usually adopted for determining the performance parameters of a solar cooker," Renewable Energy, Elsevier, vol. 181(C), pages 105-115.
    7. Ruivo, Celestino Rodrigues & Carrillo-Andrés, Antonio & Apaolaza-Pagoaga, Xabier, 2021. "Experimental determination of the standardised power of a solar funnel cooker for low sun elevations," Renewable Energy, Elsevier, vol. 170(C), pages 364-374.
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    1. Aquilanti, Alessia & Tomassetti, Sebastiano & Muccioli, Matteo & Di Nicola, Giovanni, 2023. "Design and experimental characterization of a solar cooker with a prismatic cooking chamber and adjustable panel reflectors," Renewable Energy, Elsevier, vol. 202(C), pages 405-418.
    2. Ruivo, Celestino Rodrigues & Coccia, Gianluca & Di Nicola, Giovanni & Carrillo-Andrés, Antonio & Apaolaza-Pagoaga, Xabier, 2022. "Standardised power of solar cookers with a linear performance curve following the Hottel-Whillier-Bliss formulation," Renewable Energy, Elsevier, vol. 200(C), pages 1202-1210.
    3. Apaolaza-Pagoaga, Xabier & Carrillo-Andrés, Antonio & Ruivo, Celestino Rodrigues, 2022. "Experimental characterization of the thermal performance of the Haines 2 solar cooker," Energy, Elsevier, vol. 257(C).

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