Analysis of thermal conductivity of different insulation materials is very important in applications for passive and nearly zero houses. This paper presents the measurements results of the thermal conductivities of expanded polystyrene (EPS) insulation materials, with different thicknesses and air pore content. The measurements were achieved on pure (white) as well as graphite -enhanced (grey) EPS slabs, with a Holometrix type 2000 series heat flow meter after desiccating them in a Venticell (VC) 111 type drying apparatus to changeless weight. The densities of the white samples were varied from 10 to 26 kg/m 3 (EPS types 30-200 and grey), furthermore both the white ones and the grey (14 kg/m 3 ) samples with three different thicknesses (5, 8, 10 cm) were tested. In addition, experimental results for the density dependence of thermal conductivity at low densities are given. Thermal conductivity measurements of different white slabs in combination with grey slabs were executed also and the changes in the thermal conductivity values are presented.
This article presents the results of water sorption properties investigation and thermal conductivity measurements of expanded polystyrene thermal insulation materials with different mass densities. The sorption behaviour of the expanded polystyrene materials was achieved in a Climacell 111 type climatic chamber, after drying in a Venticell 111 type desiccator apparatus. The relative humidity varied from 25% to 90% at 293 K for 240 min. The thermal conductivity of each sample was determined using a Holometrix 2000 (HLS) heat flow meter. In this article, the sorption isotherms, sorption kinetics, thermal conductivities and the prediction of changes in function of water content of four pure expanded polystyrene (30, 100, 150, 200 and grey) slabs with different densities (14, 17.5, 23.7 and 27.5 kg/m 3 ) and one expanded polystyrene mixed with graphite are given (grey expanded polystyrene). Practical application: The thermal conductivity as well as the moisture content are key thermal transport properties of building materials. The role of insulating materials in the building energy and moisture balance is more significant when compared with the other materials of the building structures. The laboratory measurements of these values of the insulating materials are very important either for the manufacturers or the contractors. The available bibliographic data for these materials are strongly incomplete and somewhere out of date.
Please cite this article as:Ákos Lakatos, Investigation of the moisture induced degradation of the thermal properties of Aerogel blankets: measurements, calculations, simulations, Energy and Buildings http://dx.doi.org/10. 1016/j.enbuild.2017.01.054 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Investigation of the moisture induced degradation of the thermal properties of
Graphical abstractIn the graphical abstract one can see an aerogel blanket between a source (warm, T1) and a sink (cold, T2). The fast ways of the heat through the moist paths of the blanket are visible from wall to wall. These fast ways are representing the moisture increased conductive and convective part of the thermal conductivity of aerogel. The ways of the heat through the dry paths are also visible.
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