Heat transfer in open cell polyurethane foam insulation

摘要

This paper study systematic investigates the combined conductive and non-gray radiative heat transfer of open cell polyurethane (PU) foam in the pressure range between 760 and 0.02 Torr. Direct transmission measure- ments are also taken using Fourier transform infrared (FTIR) spectrometer. In doing so, experimental results are obtained for the spectral extinction coefficient from 2.5 to 25 μm. In addition, the P-3 approximation method along with the box model is employed to calculate the non-gray radiative heat flux.