Effect of Contact Resistance on the Effective Thermal Conductivity of Vacuum Insulation Panels with Radiation Shields
Heat transfer in the core materials of highly-evacuated vacuum insulation panel (VIP) occurs by conduction through the solid structure and radiation through the pore.Radiation shields are inserted in the core structure of VIPs to reduce the radiation.In this study,a model for the heat transfer in VIPs with radiation shields incorporating conduction,radiation and contact resistance is suggested and analyzed.Combined conduction and radiation heat transfer in VIPs is analyzed with the discrete ordinates interpolation method (DOIM).Analysis shows an increase of the effective thermal conductivity compared to a conventional separate model for highly reflective boundaries.This result indicates that the capability of radiation shields to reduce the effective thermal conductivity may be smaller than anticipated by the separate model.When contact resistance is added to the analysis,the interaction of conduction and radiation near the wall weakens significantly.These results show that suggested combined heat transfer model in the core materials of VIPs can give an insight in the optimization of insulation performance of VIPs with radiation shields.
vacuum insulation panels radiation shields combined conduction and radiation contact resistance
Jaehyug Lee Tae-Ho Song
School of Mechanical, Aerospace and System Engineering,Korea Advanced Institute of Science and Technology, Guseong-dong 373-1, Yuseong-gu, Daejeon, Korea
国际会议
The 12th International Vacuum Insulation Symposium (IVIS 2015)(第十二届国际真空绝热材料会议)
南京
英文
216-219
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）