Numerical Analysis of the Thermal Resistance of a Multi-Layer Reflective Insulation Material Enclosed by Cavities under Varied AnglesR.S. Pelzers, A.W.M. van Schijndel
Former student Building Physics, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, The Netherlands
Chair Building Physics, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, The Netherlands
A numerical analysis on the thermal performance of a sample, consisting of two cavities surrounding a Multi-Layer Reflective Insulation (MLRI) material, under various angles and for downward and upward heat flows was performed. The sample reached high thermal resistance values when placed (nearly) horizontal under an upward heat flux, while at different angles and heat flux directions the thermal resistance was substantially lower. The heat transfer by radiation in both cavities is greatly reduced by the highly reflective surfaces of the MLRI material. Meanwhile, convective heat transfer gained a more dominant role on the heat transfer through the sample, since the radiative heat transfer in the cavities is highly decreased.