Abstract
In order to understand the performance of polymeric porous materials as heat insulators, the contribution of the radiative transfer mechanism in porous materials with high ratios of anisotropy is studied. Porous materials based on extruded polystyrene (XPS) with relative density in the range of 0.03−0.05 and with a range of anisotropy ratios of 0.6−1.4 have been selected for this research. The study begins with a characterization of the selected materials in terms of porous structure and thermal conductivity as a function of temperature. Then, the radiative contribution for each of the three main directions of the materials is obtained by three independent methodologies: Fourier Transform Infrared (FTIR) spectroscopy, derivation from the total conductivity using theoretical models, and theoretical calculation from the model proposed by Glicksman. The results show similar trends for all methods and confirm clear differences between each direction, showing a significant reduction of the radiative contribution and, thus, the total conductivity, if the material is oriented geometrically towards the direction in which the pore size is the smallest. Indeed, reductions of 17−20% in the total conductivity can be achieved at temperatures ranging from 10−40°C if the material is reoriented as stated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
