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 The available bibliographic data for these materials are strongly incomplete and somewhere out of date.
In a closed space appropriate thermal comfort and proper indoor air quality are extremely important in order to obtain optimal work performance and to avoid health problems of the occupants. Using advanced personalized ventilation systems, different comfort needs can be locally satisfied even in case of warm environments. Thermal sensation and the subjective evaluation of indoor air quality of young and elderly people, men and women respectively, were studied in warm environment using advanced personalized ventilation system combined with total volume ventilation system. Using an advanced has an important effect on the convective heat quantity released by the human body, but the
In the last years in European countries important measures were taken in order to reduce the energy need of buildings. Nevertheless the energy need for cooling of buildings is rising. In most cases, to assure the required operative temperature, air conditioning systems are installed. Consequently, in summer period the power networks of different European countries are overloaded. In order to determine the effects of glazed area orientation, air change rate and thermal mass on the indoor air temperature, at the University of Debrecen the PASSOL laboratory was built. Measurements were performed from 2009 to 2013. Using the methodology given by EN ISO 13790 the variation of indoor temperature was calculated and the theoretical values were compared with values obtained from measurements. The indoor temperature variation and the energy need for cooling was analysed for different building structures, different orientations of the glazed area and air change rates. The calculations have proven that the energy need for cooling can be reduced even to 25% of the thermal mass and the air change rate are chosen properly.
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