%0 Journal Article %A Jaehyug Lee and Tae-Ho Song %D 2015 %J International Journal of Energy and Power Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 97, 2015 %T Analysis of Combined Heat Transfer through the Core Materials of VIPs with Various Scattering Properties %U https://publications.waset.org/pdf/10000076 %V 97 %X Vacuum Insulation Panel (VIP) can achieve very low thermal conductivity by evacuating its inner space. Heat transfer in the core materials of highly-evacuated VIP occurs by conduction through the solid structure and radiation through the pore. The effect of various scattering modes in combined conduction-radiation in VIP is investigated through numerical analysis. The discrete ordinates interpolation method (DOIM) incorporated with the commercial code FLUENT® is employed. It is found that backward scattering is more effective in reducing the total heat transfer while isotropic scattering is almost identical with pure absorbing/emitting case of the same optical thickness. For a purely scattering medium, the results agrees well with additive solution with diffusion approximation, while a modified term is added in the effect of optical thickness to backward scattering is employed. For other scattering phase functions, it is also confirmed that backwardly scattering phase function gives a lower effective thermal conductivity. Thus the materials with backward scattering properties, with radiation shields are desirable to lower the thermal conductivity of VIPs. %P 12 - 15