The Experts below are selected from a list of 31038 Experts worldwide ranked by ideXlab platform
Dagnija Blumberga - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity of Heat Insulation Material Made From Coniferous Needles with Potato Starch Binder
Energy Procedia, 2016Co-Authors: Indra Muizniece, Dagnija BlumbergaAbstract:Abstract In previous experiments made by authors of this research about the possibilities to produce thermal Insulation Material from coniferous greenery (needles and thin branches), it was found that there is not enough natural resin in coniferous greenery to make sufficiently strong thermal Insulation Material plates. Therefore it is necessary to add some binder. Potato starch glue was selected as a natural and environmentally friendly binder. For that reason, the aim of the experiments in this study is to evaluate how the quantity of potato starch binder influences the thermal conductivity coefficient of the coniferous needle thermal Insulation Material. In this study two experiments were performed investigating two factors – proportion of the binder and the coniferous species (pine or spruce). In the first experiment milled fresh coniferous greenery with potato starch binder was used. In the second experiment potato starch was used to band dried needles without the branches. Granulometric content of the raw Material was determined in both cases. A total of 14 different samples were prepared and tested in this study, the thermal conductivity coefficient was determined in laboratory conditions for all of the samples. The results are compared with thermal conductivity coefficients of other thermal Insulation Materials. The possibility to use coniferous greenery to produce thermal Insulation Material is evaluated.
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Laboratory research of granulated heat Insulation Material from coniferous forestry residue
Agronomy research, 2015Co-Authors: I. Muizniece, L. Vilcane, Dagnija BlumbergaAbstract:The purpose of this research paper is to determine the heat conductivity of a granular heat Insulation Material made of coniferous greenery (fine twigs and needles), and the suitability of the Material for application as heat Insulation. In order to achieve the objective, a three-factor experiment plan was developed, and 11 samples produced. The thermal conductivity coefficient, moisture content, and density of the samples was determined. A full analysis of the experiment plan was compiled on the basis of the obtained results. The analysis results suggest that size composition, density, and tree species affect the thermal conductivity of the Material. It was discovered that smaller spruce greenery Insulation Material pellets have a smaller thermal conductivity coefficient, which indicates a better capacity for retaining heat.
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The Use of Coniferous Greenery for Heat Insulation Material Production
Energy Procedia, 2015Co-Authors: Indra Muizniece, Dagnija Blumberga, Ance AnsoneAbstract:Abstract The aim of the research is to create the ecological heat Insulation Material out of coniferous tree greenery (needles and thin branches). Following the three factor experiment plan, samples were made and tested in a laboratory for their thermal conductivity and density. The findings show that the elaborated needle heat Insulation Material is equal to existing Insulation Materials from wood and it is worth to continue this research for further product development and manufacturing.
Maatouk Khoukhi - One of the best experts on this subject based on the ideXlab platform.
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the combined effect of heat and moisture transfer dependent thermal conductivity of polystyrene Insulation Material impact on building energy performance
Energy and Buildings, 2018Co-Authors: Maatouk KhoukhiAbstract:Abstract The aim of this article is to elucidate the combined impact of heat and humidity transfer on the thermal conductivity of polystyrene used as an Insulation for building envelope. In building energy assessment, the conductivity of the Insulation Material is assumed to be constant. This yields inaccurate results, as the thermal conductivity, k-value, of any Material is a complex function of many factors, such as temperature, moisture, and density. This dependence has been shown in extant studies and linear variation of the thermal conductivity vs. temperature have been proposed for fibrous Materials. Accurate evaluation of building thermal comfort and energy assessment, which requires a precise calculation of the cooling load, and thus the sizing of the HVAC equipment, depends on the accurate determination of the thermal resistance of the building envelope components, the Insulation Material in particular. The aim of this work is thus to inspect the combined effect of operating temperature and moisture content on the thermal conductivity of polystyrene Insulation Material and its impact on the energy performance of buildings. The results reveal that the k-value of the polystyrene Insulation is significantly influenced by its moisture content at different operating temperatures. Indeed, an 8% increase in the total cooling load calculated at 28 °C and 30% moisture was measured relative to the base case evaluated at 24 °C and 0% moisture.
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variation of thermal conductivity of polystyrene Insulation Material under different operating temperatures and moisture contents
#N#Second International Conference on Advances in Mechanical and Automation Engineering - MAE 2015#N#, 2015Co-Authors: Maatouk KhoukhiAbstract:Utilizing thermal Insulation in the building envelope, in harsh climates, will considerably reduce the heat gain through the envelope of the building and consequently its energy consumption. The performance of thermal Insulation Material is mainly determined by its thermal conductivity (k), which describes the ability of heat to flow cross the Material in presence of gradient of temperature. In practice, the k-value is normally evaluated at 24°C (i.e., k24) according to relevant ASTM standards. Actually, the thermal Insulation Materials when used in building envelope are exposed to significant and continuous temperature change. Moreover, the Material moisture content, which is influenced by the ambient humidity level, may significantly affect the k-value of the Insulation Material. The main objective of this paper is to investigate the effect of the operating temperature and the moisture content on the thermal conductivity of various densities of polystyrene Insulation Material, which is widely used in Oman under hot-humid climate. Keywords—component, formatting, style, styling, insert (key words)
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effect of operating temperatures on thermal conductivity of polystyrene Insulation Material impact on envelope induced cooling load
Applied Mechanics and Materials, 2014Co-Authors: Maatouk Khoukhi, Mahmoud TahatAbstract:The impact of the thermal conductivity (k-value) change of polystyrene Insulation Material in building envelope due to changes in temperature on the thermal and energy performance of a typical residential building under hot climate is investigated. Indeed, the thermal and energy performance of buildings depends on the thermal characteristics of the building envelope, and particularly on the thermal resistance of the Insulation Material used. The thermal Insulation Material which is determined by its thermal conductivity, which describes the ability of heat to flow cross the Material in presence of a gradient of temperature, is the main key to assess the performance of the thermal Insulation Material. When performing the energy analysis or calculating the cooling load for buildings, we use published values of thermal conductivity of Insulation Materials, which are normally evaluated at 24°C according to the ASTM standards. In reality, thermal Insulation in building is exposed to significant and continuous temperature variations, due essentially to the change of outdoor air temperature and solar radiation. Many types of Insulation Materials are produced and used in Oman, but not enough information is available to evaluate their performance under the prevailing climatic condition. The main objective of this study is to investigate the relationship between the temperature and thermal conductivity of various densities of polystyrene, which is widely used as building Insulation Material in Oman. Moreover, the impact of thermal conductivity variation with temperature on the envelope-induced cooling load for a simple building model is discussed. This work will serve as a platform to investigate the effect of the operating temperature on thermal conductivity of other building Material Insulations, and leads to more accurate assessment of the thermal and energy performance of buildings in Oman.
Indra Muizniece - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity of Heat Insulation Material Made From Coniferous Needles with Potato Starch Binder
Energy Procedia, 2016Co-Authors: Indra Muizniece, Dagnija BlumbergaAbstract:Abstract In previous experiments made by authors of this research about the possibilities to produce thermal Insulation Material from coniferous greenery (needles and thin branches), it was found that there is not enough natural resin in coniferous greenery to make sufficiently strong thermal Insulation Material plates. Therefore it is necessary to add some binder. Potato starch glue was selected as a natural and environmentally friendly binder. For that reason, the aim of the experiments in this study is to evaluate how the quantity of potato starch binder influences the thermal conductivity coefficient of the coniferous needle thermal Insulation Material. In this study two experiments were performed investigating two factors – proportion of the binder and the coniferous species (pine or spruce). In the first experiment milled fresh coniferous greenery with potato starch binder was used. In the second experiment potato starch was used to band dried needles without the branches. Granulometric content of the raw Material was determined in both cases. A total of 14 different samples were prepared and tested in this study, the thermal conductivity coefficient was determined in laboratory conditions for all of the samples. The results are compared with thermal conductivity coefficients of other thermal Insulation Materials. The possibility to use coniferous greenery to produce thermal Insulation Material is evaluated.
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The Use of Coniferous Greenery for Heat Insulation Material Production
Energy Procedia, 2015Co-Authors: Indra Muizniece, Dagnija Blumberga, Ance AnsoneAbstract:Abstract The aim of the research is to create the ecological heat Insulation Material out of coniferous tree greenery (needles and thin branches). Following the three factor experiment plan, samples were made and tested in a laboratory for their thermal conductivity and density. The findings show that the elaborated needle heat Insulation Material is equal to existing Insulation Materials from wood and it is worth to continue this research for further product development and manufacturing.
Xiaochen Guo - One of the best experts on this subject based on the ideXlab platform.
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Thermal Insulation Performance of the Thermal Insulation Material of the Exterior Wall of the Port Building
Journal of Coastal Research, 2019Co-Authors: Xiaochen GuoAbstract:ABSTRACT Guo, X., 2019. Thermal Insulation performance of the thermal Insulation Material of the exterior wall of the port building. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Wat...
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Thermal Insulation Performance of the Thermal Insulation Material of the Exterior Wall of the Port Building
Journal of Coastal Research, 2019Co-Authors: Xiaochen GuoAbstract:Guo, X., 2019. Thermal Insulation performance of the thermal Insulation Material of the exterior wall of the port building. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 341–347. Coconut Creek (Florida), ISSN 0749-0208.The thermal Insulation performance of the thermal Insulation Material of the external wall of the port building is studied, and the optimum proportion of the heat-insulating property of the Material and the thickness of the heat-insulating layer of the Material is analyzed, and the construction of the invention provides a method for constructing a relationship model based on the self-correlation characteristic analysis of the thermal Insulation performance of the outer wall Material of the port building and the thickness performance of the thermal Insulation layer of the Material. The detailed experimental data is obtained to guide the design and construction of the external wall of the port building. Firstly, the Material property and structural model of the thermal Insulation Material of the external wall of the port building are analyzed, then the calculation of the thickness of the thermal Insulation Material of the external wall of the port building and the mathematical analysis of the thermal resistance are carried out, and the thermal resistance detection model for the design of the thickness change of the thermal Insulation Material under different temperatures is given. And the test and the numerical calculation of the test piece are carried out. The test results show that the model can accurately analyze the thermal Insulation performance of the thermal Insulation Material of the external wall of the port building, the accuracy of the thermal Insulation performance of the thermal Insulation Material of the external wall of the port building is high, the construction cost is saved, and the thermal Insulation performance of the thermal Insulation Material of the external wall of the port building is improved.
F Bade - One of the best experts on this subject based on the ideXlab platform.
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experimental evaluation of Insulation Material in roofing system under tropical climate
Solar Energy, 2005Co-Authors: Ted Soubdhan, T Feuillard, F BadeAbstract:The objective of this study is to determine the influence of radiant barriers on conductive and radiative heat transfers when they are integrated to a building envelope and to compare their efficiency to traditional Insulation Material (mineral wools, polystyrene). It is also about determining which Insulation Material and process can lead to a better heat flux reduction through a building roof. For this study four identical small-scale test cells were used. Their respective roof was equipped with the Insulation Material to be tested: One with polystyrene, the second with a radiant barrier the third one with fibber glass and the last one with no Insulation Material was considered as the reference cell. Different test were performed with a view to evaluate the influence of parameters such as roof absorptivity and roof air layer ventilation on the heat flux reduction through the roof. With the measured temperature, the conductive and radiative heat fluxes were calculated. With a white corrugated iron roof top the heat flux reduction provided by the radiant barrier is 37%. With a black one this Material allows a reduction of 33%. It is shown that whatever the roof absorptivity value, the radiative heat flux is predominant over the conductive one. With no ventilation, the radiant barrier is comparable to polystyrene and fiber glass; when the airspace is ventilated the radiant barrier provides a better Insulation.