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Chitosan foam reinforced by SiC whisker for building insulation with high mechanical strength and vapor permeability

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Science China(Technological Sciences) 2022年第12期65卷 2874-2882页

作者： LI DongSheng GAO Gang HUANG CongLiang School of Low-carbon Energy and Power Engineering China University of Mining and TechnologyXuzhou 221116China

Porous foam based on renewable materials has attracted extensive attention in green energy conservation and sustainable ***,there is still a requisite for biomass-based porous foam that could meet the demand for excellent mechanical and high thermal insulation performances for building ***,we demonstrated a facile strategy to prepare a porous foam made from a chitosan matrix reinforced by SiC whisker,which shows good performance in building insulation and mechanical *** prepared porous foam has a low density(20.1–54.4 kg m^(-3))and high porosity(>97.0%).The density of the chitosan-SiC porous foam can be controlled by varying the suspension solid and SiC whisker content in the preparation ***,the influences of SiC whisker content on the mechanical properties and thermal conductivity of the porous foams were also *** the content of SiC whisker is 30 wt%,the prepared porous foam has the highest compression modulus of about 89.8 kPa and also low thermal conductivity of 0.0354 W m^(-1)K^(-1).Moreover,the prepared porous foam shows excellent water vapor permeability with a vapor resistance factor of 2.94,which is beneficial for moisture transfer in *** work provides a facile way to manufacture biomass-based porous foam,which is potential for energy saving in buildings.

关键词： porous foam biomass-based material thermal insulation mechanical property vapor permeability

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Analyses on performances of heat and multilayer reflection insulators

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Journal of Central South University 2012年第6期19卷 1645-1656页

作者： LEE Moo-jin LEE Kang-guk SEO Won-duck School of Architecture Kyungil UniversityGyeongsan 702701Korea Research Center for Urban Affair Kyungil UniversityGyeongsan 702701Korea Department of Architectural Design Joongbu UniversityGeumsan-gun 701140Korea

This research was conducted to study the performances of the heat and multilayer reflection insulators used for buildings in South Korea to realize eco-friendly, low-energy-consumption, green construction, and to contribute to energy consumption reduction in buildings and to the nation＇s greenhouse gas emission reduction policy （targeting 30% reduction compared to BAUCousiness as usual） by 2020）. The heat insulation performance test is about the temperatures on surfaces of test piece. The high air temperature and the low air temperature were measured to determine the overall heat transfer coefficient and thermal conductivity. The conclusions are drawn that the heat transmission coefficients for each type of existing reflection insulator are： A-1 （0.045 W/（m-K））, A-2 （0.031 W/（m.K））, A-3 （0.042 W/（m.K））, A-4 （0.078 W/（m.K））, and the average heat conductivity is 0.049 W/（m-K）; The heat conductivity for each type of Styrofoam insulator are 0.030 W/（m.K） for B-l, 0.032 W/（m-K） for B-2, 0.037 W/（m＇K） for B-3, 0.037 W/（m.K） for B-4, and the average heat conductivity is 0.035 W/（m＇K） regardless of the thickness of the insulator; The heat conductivity values of the multilayer reflection insulators are converted based on the thickness and type C-1 （0.020 W/（m.K））, C-2 （0.018 W/（m.K））, C-3 （0.016 W/（m.K））, and C-4 （0.012 W/（m.K））; The multilayer reflection insulator keeps the indoor-side surface temperature high （during winter） or low （in summer）, enhances the comfort of the building occupants, and conducts heating and moisture resistance to prevent dew condensation on the glass-outer-wall surface.

关键词： heat reflection insulator multilayer reflection insulator overall heat transfer coefficient thermal conductivity nonflammability vapor permeability eco-friendly construction

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