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Combined heat transfer in multi-layered radiation shields for vacuum insulation panels: Theoretical/numerical analyses and experiment

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  • Kim, Jongmin
  • Jang, Choonghyo
  • Song, Tae-Ho

Abstract

Radiation and conduction heat transfer in stacked radiation shields to be used in the VIP (vacuum insulation panel) is investigated. Test radiation shields are multi-layered films of 32nm Al, 12μm PET and 32nm Al thicknesses, folded with regular span and stacked in staggered manner. Radius of curvature of the folded parts is measured by a three-dimensional scanner and the contact radius is calculated using Hertz contact theory. Depthwise conduction around the contact spot and two-dimensional radial conduction models are adopted for the theoretical and the numerical analyses, together with measured surface emissivity. Measurement of the effective thermal conductivity of radiation shields is conducted using a vacuum guarded hot plate apparatus. Measurements show very low values between 0.3 and 1.0mW/mK. Theoretical and numerical results agree with measurements with maximum relative error of 29.1% and 18.3%, respectively. A simplified conduction model is also proposed and shown to be very useful for practical applications. We find that the stacked radiation shields have very high insulation performance, the numerical model is fairly reliable and finally, conduction is negligibly small compared with radiation for this shield.

Suggested Citation

  • Kim, Jongmin & Jang, Choonghyo & Song, Tae-Ho, 2012. "Combined heat transfer in multi-layered radiation shields for vacuum insulation panels: Theoretical/numerical analyses and experiment," Applied Energy, Elsevier, vol. 94(C), pages 295-302.
    • Handle: RePEc:eee:appene:v:94:y:2012:i:c:p:295-302
    DOI: 10.1016/j.apenergy.2012.01.072
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    References listed on IDEAS

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    1. Alam, M. & Singh, H. & Limbachiya, M.C., 2011. "Vacuum Insulation Panels (VIPs) for building construction industry – A review of the contemporary developments and future directions," Applied Energy, Elsevier, vol. 88(11), pages 3592-3602.
    2. Saari, Arto & Kalamees, Targo & Jokisalo, Juha & Michelsson, Rasmus & Alanne, Kari & Kurnitski, Jarek, 2012. "Financial viability of energy-efficiency measures in a new detached house design in Finland," Applied Energy, Elsevier, vol. 92(C), pages 76-83.
    3. Nussbaumer, T. & Wakili, K. Ghazi & Tanner, Ch., 2006. "Experimental and numerical investigation of the thermal performance of a protected vacuum-insulation system applied to a concrete wall," Applied Energy, Elsevier, vol. 83(8), pages 841-855, August.
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    Cited by:

    1. Jang, Choonghyo & Jung, Haeyong & Lee, Jaehyug & Song, Tae-Ho, 2013. "Radiative heat transfer analysis in pure scattering layers to be used in vacuum insulation panels," Applied Energy, Elsevier, vol. 112(C), pages 703-709.
    2. Chen, Zhou & Chen, Zhaofeng & Yang, Zhaogang & Hu, Jiaming & Yang, Yong & Chang, Lingqian & Lee, L. James & Xu, Tengzhou, 2015. "Preparation and characterization of vacuum insulation panels with super-stratified glass fiber core material," Energy, Elsevier, vol. 93(P1), pages 945-954.
    3. Jessie R. Smith & Savvas Gkantonas & Epaminondas Mastorakos, 2022. "Modelling of Boil-Off and Sloshing Relevant to Future Liquid Hydrogen Carriers," Energies, MDPI, vol. 15(6), pages 1-32, March.
    4. Zhang Yang & Takao Katsura & Masahiro Aihara & Makoto Nakamura & Katsunori Nagano, 2017. "Development of Numerical Heat Transfer and the Structural Model to Design Slim and Translucent Vacuum Layer Type Insulation Panels to Retrofitting Insulation in Existing Buildings," Energies, MDPI, vol. 10(12), pages 1-15, December.

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