Thermal Analysis in an Intermittent Kiln with Thermal Insulation: An Experimental Design Approach

2020 ◽  
Vol 27 ◽  
pp. 99-112
Author(s):  
Ricardo Soares Gomez ◽  
Antonio Gilson Barbosa de Lima ◽  
Túlio Rafael Nascimento Porto ◽  
Hortência Luma Fernandes Magalhães ◽  
Michelly Dayane Araújo de Almeida ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Experimental Design ◽  
Thermal Insulation ◽  
External Surface ◽  
Process Efficiency ◽  
Factorial Experimental Design ◽  
Insulating Materials ◽  
Independent Variables ◽  
Response Variables

The main purpose of this work is to evaluate the influence of the thickness and thermophysical properties of insulating materials on the maximum external surface temperature and energy gain provided for an intermittent ceramic kiln operating with natural gas as fuel. To evaluate the influence of independent variables on response variables, a factorial experimental design was developed. From the analysis of variance (ANOVA), it was possible to determine significant and well-adjusted mathematical models for both response variables. It was verified that the thickness and thermal conductivity of thermal insulation are the independent variables that have the greatest influence on the process efficiency.

Development of high-insulating materials with aerogel for protective clothing applications – an overview

2021 ◽  
Vol 112 (2) ◽  
pp. 164-172
Author(s):  
Agnieszka Greszta ◽  
Sylwia Krzemińska ◽  
Grażyna Bartkowiak ◽  
Anna Dąbrowska
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
State Of The Art ◽  
Knitted Fabrics ◽  
Insulating Materials ◽  
Textile Materials ◽  
Wide Range ◽  
Properties Of Materials ◽  
Hot Environments

Abstract Aerogels are ultra-light solids with extremely low thermal conductivity (even lower than air), thanks to which they have a huge potential in a wide range of applications. The purpose of this publication is to present the state-of-the art knowledge of the possibility of using aerogels to increase the thermal insulation properties of clothing materials intended for use in both cold and hot environments. Various methods of aerogels application to textile materials (non-woven, woven and knitted fabrics) are discussed, indicating their advantages and limitations. Numerous research studies confirm that aerogels significantly improve the thermal insulation properties of materials, but due to their delicate and brittle structure and their tendency to dusting, their application still poses considerable problems.

scholarly journals Obtaining of heat-insulating materials based on silica-containing waste with the addition of dolomite

2020 ◽  
Vol 17 (6) ◽  
pp. 149-155
Author(s):  
N. K. Manakova ◽  
◽  
O. V. Suvorova ◽  
Keyword(s):  
Thermal Conductivity ◽  
Porous Structure ◽  
Silica Fume ◽  
Thermal Insulation ◽  
Silicate Matrix ◽  
High Quality ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Preliminary Activation ◽  
Technical Properties

The paper presents the results of the study of feasibility of obtaining high-quality foamed thermal insulation materials based on a silicate matrix with addition of dolomite. It has been found out that the preliminary activation of a suspension based on a silica-containing component at a temperature of 90°C for 5-7 minutes allows accelerating the coagulation of silica fume and the synthesis of sodium silicates. Optimal foaming conditions for the charge frothing are 650-700°C for 25 minutes. There have been obtained foam silicates with a relatively uniform finely porous structure and stable physical and technical properties with density 0.38-0.48 g/cm³, strength up to 3 MPa, thermal conductivity 0.048-0.054 W/(m·K).

Evaluation of Structure Influence on Thermal Conductivity of Thermal Insulating Materials from Renewable Resources

1970 ◽  
Vol 17 (2) ◽  
pp. 208-212 ◽  
Author(s):  
Jolanta VĖJELIENĖ ◽  
Albinas GAILIUS ◽  
Sigitas VĖJELIS ◽  
Saulius VAITKUS ◽  
Giedrius BALČIŪNAS
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Renewable Resources ◽  
Raw Materials ◽  
Raw Material ◽  
Barley Straw ◽  
Insulation Material ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Thermal Insulating

The development of new thermal insulation materials needs to evaluate properties and structure of raw material, technological factors that make influence on the thermal conductivity of material. One of the most promising raw materials for production of insulation material is straw. The use of natural fibres in insulation is closely linked to the ecological building sector, where selection of materials is based on factors including recyclable, renewable raw materials and low resource production techniques In current work results of research on structure and thermal conductivity of renewable resources for production thermal insulating materials are presented. Due to the high abundance of renewable resources and a good its structure as raw material for thermal insulation materials barley straw, reeds, cattails and bent grass stalks are used. Macro- and micro structure analysis of these substances is performed. Straw bales of these materials are used for determining thermal conductivity. It was found that the macrostructure has the greatest effect on thermal conductivity of materials. Thermal conductivity of material is determined by the formation of a bale due to the large amount of pores among the stalks of the plant, inside the stalk and inside the stalk wall.http://dx.doi.org/10.5755/j01.ms.17.2.494

scholarly journals Reduction of Fractionation of Lightweight Slurry to Geothermal Boreholes

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3686
Author(s):  
Marcin Kremieniewski ◽  
Bartłomiej Jasiński ◽  
Grzegorz Zima ◽  
Łukasz Kut
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Thermal Energy ◽  
Xanthan Gum ◽  
Cement Slurry ◽  
Insulating Materials ◽  
Class A ◽  
Good Improvement ◽  
Cement Sheath ◽  
Slurry Stability

When designing the cement slurry for casing string cementing in geothermal boreholes, the appropriate thermal conductivity is selected. In the zone of geothermal water, where thermal energy is collected, cement slurry is used, from which the cement sheath has high thermal conductivity. On the other hand, the remaining part of the opening is sealed with slurry, from which the cement sheath will reduce thermal energy losses through appropriate thermal insulation. Cement slurry with appropriate thermal insulation includes light insulating materials. However, the use of such additives is very problematic as they are fractionated due to their low density Therefore, measures should be taken to prevent fractionation of the cement slurry for sealing geothermal boreholes. This article presents the results of research on fractionation of cement slurries for sealing geothermal boreholes. 12 slurries were used for the tests. Six of them are based on class A cement, and six based on class G cement. This action shows the differences in fractionation depending on the binder used. However, the main area of research is determining the effectiveness of counteracting fractionation by the means used for this purpose. As a result of the conducted works, a very good improvement of the cement slurry stability is obtained after the introduction of xanthan gum, as well as filtration perlite. These measures prevent fractionation, so that the cement slurry has a homogeneous structure, and the cement sheath provides the required thermal insulation in the geothermal well.

scholarly journals ANALYSIS OF THERMAL INSULATION FROM RENEWABLE RESOURCES

2010 ◽  
Vol 2 (2) ◽  
pp. 66-70 ◽  
Author(s):  
Jolanta Vėjelienė ◽  
Albinas Gailius
Keyword(s):  
Thermal Conductivity ◽  
European Union ◽  
Total Energy ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Renewable Resources ◽  
Significant Part ◽  
The European Union ◽  
Insulating Materials ◽  
Efficient Energy

One of the essential requirements for buildings is energy saving and heat retention. About 40% of the total energy consumed in the European Union is used for heating of buildings. Most of the energy consumed in buildings is used for heating during the cold period and cooling during the warm period. A significant part of energy can be saved due to suitable insulation of buildings. More efficient energy saving can be ensured by using heat-insulating materials produced from renewable resources. In Lithuania straw is often used for making thermal insulation obtained with a thermal conductivity of 0.040 W/(mK). Straw thermal conductivity under different conditions as well as possibilities to use it for producing heat-insulating materials are analysed in the work.

scholarly journals Thermal analysis in an air conditioning duct: An experimental design approach

2020 ◽  
Vol 9 (12) ◽  
pp. e20291211140
Author(s):  
Ricardo Soares Gomez ◽  
Túlio Rafael Nascimento Porto ◽  
Kelly Cristiane Gomes ◽  
João Alves de Lima ◽  
José Maurício Alves de Matos Gurgel ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Experimental Design ◽  
Thermal Insulation ◽  
Air Conditioning ◽  
Mathematical Formulation ◽  
Contour Plot ◽  
Response Variable ◽  
Insulating Material ◽  
First Law Of Thermodynamics ◽  
Insulation Thickness

The main purpose of this work is to perform a thermal analysis in an air conditioning duct to verify the influence of the thermal properties of the insulating material on the minimum thermal insulation thickness necessary to avoid the condensation of water vapor present in the air. The mathematical formulation is based on Fourier’s law and the first law of thermodynamics. A response surface, a contour plot and a mathematical model for the analyzed response variable, were obtained from an experimental design. Results indicate that the reduction of thermal conductivity and increase of emissivity of the insulating material contribute to the reduction of the minimum thermal insulation thickness.

scholarly journals Using of Aerogel to Improve Thermal Insulating Properties of Windows

2018 ◽  
Vol 14 (1) ◽  
pp. 2-11 ◽  
Author(s):  
Denisa Valachova ◽  
Nada Zdrazilova ◽  
Vladan Panovec ◽  
Iveta Skotnicova
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Building Structures ◽  
Insulating Materials ◽  
Insulating Material ◽  
Composite Systems ◽  
Thermal Insulating ◽  
Technical Requirements ◽  
Technical Properties ◽  
Insulating Properties

AbstractFor the best possible thermal-technical properties of building structures it is necessary to use materials with very low thermal conductivity. Due to the increasing thermal-technical requirements for building structures, the insulating materials are developed. One of the modern thermal insulating materials is so-called aerogel. Unfortunately, this material is not used in the field of external thermal insulation composite systems because of its price and its properties. The aim of this paper is to present possibilities of using this insulating material in the civil engineering - specifically a usage of aerogel in the production of windows.

scholarly journals Study of thermal conductivity coefficient of basalt fiber insulation at various temperature conditions

Vestnik IGEU ◽  
2021 ◽  
pp. 15-24
Author(s):  
E.R. Bazukova ◽  
Yu.V. Vankov ◽  
S.O. Gaponenko ◽  
N.N. Smirnov
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Thermophysical Properties ◽  
Thermal Conductivity Coefficient ◽  
Thermal Protection ◽  
Operating Temperature ◽  
Basalt Fiber ◽  
Electric Heater ◽  
Insulating Materials ◽  
Temperature Conditions

Industrial thermal insulation fibrous materials (mineral wool and fiberglass products) are mainly used for thermal protection of the systems transporting high-temperature heat carriers. The data known in the scientific literature about the effect of insulation density and operating temperature conditions on the thermophysical properties of materials made of basalt fiber differ significantly. Taking these data into account let us improve the accuracy of thermal calculations and the validity of design solutions for thermal protection of industrial networks up to 60 %. The aim of the study is to obtain data on the change of the heat-shielding properties of insulating materials made of basalt fiber of various densities, depending on the temperature conditions of operation. An experimental study of the thermophysical properties of several samples of basalt fiber insulation has been carried out on a laboratory bench. The density of a constant heat flux passing through the sample has been determined by the additional wall method. The experimental unit consists of a cylindrical metal tube with a built-in electric heater, on the top of which a heat-insulating basalt fiber of various densities is placed. The temperature on the pipe surface is changed in the range from 50 to 350 оC. The dependence of the thermal conductivity coefficient of thermal insulation basalt fiber samples on its density and operating temperature of the material is obtained. The research results show that thermal conductivity coefficient of basalt fiber insulation increases with temperature increase of the pipeline surface. The lower the value of the material density is, the higher the increment of the thermal conductivity coefficient is. The obtained results enrich the data about the dependence of the thermal conductivity of fibrous heat-insulating materials on density and temperature (for cases of operation at high temperatures). Considering the density of the examined materials made of basalt fiber when determining the thermal conductivity makes it possible to increase the accuracy of calculations up to 20 % and temperature modes of operation up to 60 %. The results obtained can be applied to find the thickness of the thermal insulation of pipelines and heat losses in the networks.

Identifying suboptimalities with factorial model comparison

2018 ◽  
Vol 41 ◽  
Author(s):  
Wei Ji Ma
Keyword(s):  
Experimental Design ◽  
Model Comparison ◽  
Process Models ◽  
Multiple Forms ◽  
Factorial Experimental Design ◽  
Factorial Model ◽  
Multiple Components ◽  
The Many

AbstractGiven the many types of suboptimality in perception, I ask how one should test for multiple forms of suboptimality at the same time – or, more generally, how one should compare process models that can differ in any or all of the multiple components. In analogy to factorial experimental design, I advocate for factorial model comparison.

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