2023 Volume 29 Issue 71 Pages 239-244
It is known that the thermal conductivity of insulation foams increases with time due to the emission of the blowing agents from foams and the transfer of the air into them. In this paper, the aging of thermal conductivity in phenolic foam is discussed with measured data and numerical analysis. Measurement of specimens with different thicknesses and surface material conditions are conducted and the aging characteristics are examined. Using the estimation equations of thermal conductivity change, the effective diffusion coefficient and mass transfer coefficient of the blowing agents is obtained by comparing the simulation results and the measured value.
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