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A unified heat transfer model in a pressurized volumetric solar receivers

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  • Wang, P.
  • Liu, D.Y.
  • Xu, C.
  • Xia, L.
  • Zhou, L.

Abstract

In the present work, we developed an overall mathematical model adequately describing the main heat transfer processes in a pressurized volumetric receiver. The key components, a windowed cavity, incorporating with the irradiated surface of the absorber, were theoretically modeled as a closed diffuse-gray surfaces system. Accordingly, a boundary condition for the absorber concerning its porous structure surface was developed using net radiation method (NRM) under local thermal non-equilibrium (LTNE) condition. The same method is also applied to the back cavity. Then a modified P1 approximation with collimated irradiation was introduced to incorporate the radiation transfer penetrating in the absorber. The major characteristic of the heat transfer behavior combining radiation, thermal conduction, and convection in the windowed cavity, absorber and the back cavity, are detailedly presented. Also, the key design parameters, such as those relating to pore structure (φ and dp), the volumetric heat transfer coefficient hv, the emissivity ε for window and absorber, and their thickness La and Lg were systematically analyzed. Optimization design can be carried out for both of the solar thermal system and the receiver itself in the future work based on our model.

Suggested Citation

  • Wang, P. & Liu, D.Y. & Xu, C. & Xia, L. & Zhou, L., 2016. "A unified heat transfer model in a pressurized volumetric solar receivers," Renewable Energy, Elsevier, vol. 99(C), pages 663-672.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:663-672
    DOI: 10.1016/j.renene.2016.07.030
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    References listed on IDEAS

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    1. Roldán, M.I. & Smirnova, O. & Fend, T. & Casas, J.L. & Zarza, E., 2014. "Thermal analysis and design of a volumetric solar absorber depending on the porosity," Renewable Energy, Elsevier, vol. 62(C), pages 116-128.
    2. Wang, P. & Liu, D.Y. & Xu, C., 2013. "Numerical study of heat transfer enhancement in the receiver tube of direct steam generation with parabolic trough by inserting metal foams," Applied Energy, Elsevier, vol. 102(C), pages 449-460.
    3. Roldán, M.I. & Zarza, E. & Casas, J.L., 2015. "Modelling and testing of a solar-receiver system applied to high-temperature processes," Renewable Energy, Elsevier, vol. 76(C), pages 608-618.
    4. Capuano, Raffaele & Fend, Thomas & Schwarzbözl, Peter & Smirnova, Olena & Stadler, Hannes & Hoffschmidt, Bernhard & Pitz-Paal, Robert, 2016. "Numerical models of advanced ceramic absorbers for volumetric solar receivers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 656-665.
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    Cited by:

    1. Avila-Marin, Antonio L. & Alvarez de Lara, Monica & Fernandez-Reche, Jesus, 2018. "Experimental results of gradual porosity volumetric air receivers with wire meshes," Renewable Energy, Elsevier, vol. 122(C), pages 339-353.
    2. Li Wang & Long Yang & Junjie Liu & Pei Wang, 2021. "Study on Spectral Radiative Heat Transfer Characteristics of a Windowed Receiver with Particle Curtain," Energies, MDPI, vol. 14(10), pages 1-16, May.
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    4. Wu, Ze & Li, Xiao-Lei & Chen, Xue & Xia, Xin-Lin, 2024. "Performance evaluation of a partially-filled porous foam cylindrical tubular receiver realizing Ni foam material reduction," Renewable Energy, Elsevier, vol. 226(C).

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