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Natural convective heat transfer in trapezoidal enclosure of box-type solar cooker

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  • Kumar, Subodh

Abstract

This paper presents simple thermal analysis to evaluate the natural convective heat transfer coefficient, hc12 for a trapezoidal absorber plate-inner glass cover enclosure of a double-glazed box-type solar cooker. Several indoor simulation experiments in steady state conditions have been performed to measure the temperatures of absorber plate, inner and outer glass covers, ambient air, electrical input supply and wind speed. The experimental data has been correlated by an equation of the form, Nu = CRan. The values of the constants C and n, obtained by linear regression analysis are used to calculate the convective heat transfer coefficient. The heat transfer analysis predicts that hc12 varies from 4.84 to 6.23 W m−2 oC−1 for the absorber plate temperature from 54 to 141 oC. The results of hc12 are compared with those of rectangular enclosure for the same absorber-inner glass cover temperatures and gap spacing. The study reveals that the values of convective heat transfer coefficient and top heat loss coefficient for rectangular enclosure are lower by 31–35% and 7% respectively.

Suggested Citation

  • Kumar, Subodh, 2004. "Natural convective heat transfer in trapezoidal enclosure of box-type solar cooker," Renewable Energy, Elsevier, vol. 29(2), pages 211-222.
    • Handle: RePEc:eee:renene:v:29:y:2004:i:2:p:211-222
    DOI: 10.1016/S0960-1481(03)00193-9
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    References listed on IDEAS

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    1. Kumar, Subodh & Sharma, V.B. & Kandpal, T.C. & Mullick, S.C., 1997. "Wind induced heat losses from outer cover of solar collectors," Renewable Energy, Elsevier, vol. 10(4), pages 613-616.
    2. Mullick, S.C. & Kandpal, T.C. & Kumar, Subodh, 1997. "Top heat-loss factor of double-glazed box-type solar cooker from indoor experiments," Energy, Elsevier, vol. 22(6), pages 559-565.
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    Citations

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    Cited by:

    1. Thirugnanasambandam, Mirunalini & Iniyan, S. & Goic, Ranko, 2010. "A review of solar thermal technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 312-322, January.
    2. Saxena, Abhishek & Varun & Pandey, S.P. & Srivastav, G., 2011. "A thermodynamic review on solar box type cookers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(6), pages 3301-3318, August.
    3. Saxena, Abhishek & Cuce, Erdem & Tiwari, G.N. & Kumar, Avnish, 2020. "Design and thermal performance investigation of a box cooker with flexible solar collector tubes: An experimental research," Energy, Elsevier, vol. 206(C).
    4. Aramesh, Mohamad & Ghalebani, Mehdi & Kasaeian, Alibakhsh & Zamani, Hosein & Lorenzini, Giulio & Mahian, Omid & Wongwises, Somchai, 2019. "A review of recent advances in solar cooking technology," Renewable Energy, Elsevier, vol. 140(C), pages 419-435.
    5. Cuce, Erdem & Cuce, Pinar Mert, 2013. "A comprehensive review on solar cookers," Applied Energy, Elsevier, vol. 102(C), pages 1399-1421.
    6. Mahavar, S. & Sengar, N. & Dashora, P., 2017. "Analytical model for electric back-up power estimation of solar box type cookers," Energy, Elsevier, vol. 134(C), pages 871-881.

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