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Journal articles on the topic 'Thermal stability of insulation'
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1
Lohtander, Tia, Reima Herrala, Päivi Laaksonen, Sami Franssila, and Monika Österberg. "Lightweight lignocellulosic foams for thermal insulation." Cellulose 29, no. 3 (January 6, 2022): 1855–71. http://dx.doi.org/10.1007/s10570-021-04385-6.
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AbstractFoams are mainly composed of dispersed gas trapped in a liquid or solid phase making them lightweight and thermally insulating materials. Additionally, they are applicable for large surfaces, which makes them attractive for thermal insulation. State-of-the-art thermally insulating foams are made of synthetic polymeric materials such as polystyrene. This work focuses on generating foam from surfactants and renewable lignocellulosic materials for thermally insulating stealth material. The effect of two surfactants (sodium dodecyl sulphate (SDS) and polysorbate (T80)), two cellulosic materials (bleached pulp and nanocellulose), and lignin on the foaming and stability of foam was investigated using experimental design and response surface methodology. The volume-optimized foams determined using experimental design were further studied with optical microscopy and infrared imaging. The results of experimental design, bubble structure of foams, and observations of their thermal conductivity showed that bleached pulp foam made using SDS as surfactant produced the highest foam volume, best stability, and good thermal insulation. Lignin did not improve the foaming or thermal insulation properties of the foam, but it was found to improve the structural stability of foam and brought natural brown color to the foam. Both wet and dry lignocellulosic foams provided thermal insulation comparable to dry polystyrene foam. Graphical abstract
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Liang, Ningchuan, Ruijin Liao, Min Xiang, Yang Mo, and Yuan Yuan. "Influence of Amine Compounds on the Thermal Stability of Paper-Oil Insulation." Polymers 10, no. 8 (August 9, 2018): 891. http://dx.doi.org/10.3390/polym10080891.
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Amine compounds can greatly enhance the thermal stability of the insulating paper used in paper-oil insulation. Many research documents focus on paper‘s excellent thermal stability, but less attention has been paid to the effect of oil on paper’s degradation. In this research paper, we study the influence of different amine compounds on the thermal stability of both paper and oil, and a mechanism for the influence on paper-oil insulation as well as an optimal formula are proposed. First, six groups of paper were modified with different proportions of dicyandiamide (DICY), melamine, and polyacrylamide (PAM). Then, an accelerated thermal aging test at 130 °C was conducted for 30 days and the thermal aging characteristics of the oil-modified paper insulation were measured. The results showed that the thermal stability of the insulation paper modified with the amine compounds was remarkably improved, and P2 (2.25 wt % melamine, 0.75 wt % DICY, and 0.2 wt % PAM) presented the best anti-aging properties. However, certain properties of oil were influenced, such as acid value, and it was found that the ammonia produced by the amine stabilizers increased the copper compound content, which led to the deterioration of the insulating oil. Moreover, using a front-line orbital energy analysis by molecule modeling, it was determined that melamine was the core thermal stabilizer for the paper among the three amine compounds used in P2.
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Diban, Bassel, and Giovanni Mazzanti. "The Effect of Insulation Characteristics on Thermal Instability in HVDC Extruded Cables." Energies 14, no. 3 (January 21, 2021): 550. http://dx.doi.org/10.3390/en14030550.
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This paper aims at studying the effect of cable characteristics on the thermal instability of 320 kV and 500 kV Cross-Linked Polyethylene XLPE-insulated high voltage direct-current (HVDC) cables buried in soil for different values of the applied voltages, by the means of sensitivity analysis of the insulation losses to the electrical conductivity coefficients of temperature and electric field, a and b. It also finds the value of dielectric loss coefficient βd for DC cables, which allows an analytical calculation of the temperature rise as a function of insulation losses and thermal resistances. A Matlab code is used to iteratively solve Maxwell’s equations and find the electric field distribution, the insulation losses and the temperature rise inside the insulation due to insulation losses of the cable subjected to load cycles according to CIGRÉ Technical Brochure 496. Thermal stability diagrams are found to study the thermal instability and its relationship with the cable ampacity. The results show high dependency of the thermal stability on the electrical conductivity of cable insulating material, as expressed via the conductivity coefficients of temperature and electric field. The effect of insulation thickness on both the insulation losses and the thermal stability is also investigated.
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Wang, Yipu, Zhengtao Tu, and Linyang Yuan. "Analysis of thermal energy storage optimization of thermal insulation material and thermal insulation structure of steam pipe-line." Thermal Science 24, no. 5 Part B (2020): 3249–57. http://dx.doi.org/10.2298/tsci191126116w.
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In order to improve the steam pipe insulation material joints, waterproof, and other shortcomings, and provide a good design scheme for the insulation structure optimization, a gel heat preservation material was prepared through hydration hardening theory. Firstly, the preparation of thermal insulation material for steam pipe and the optimal design of thermal insulation structure was introduced. Then the performance of the insulation material of the steam pipe was evaluated. Finally, the stability and energy benefit of the thermal insulation structure were evaluated. The results show that the new gel thermal insulation material prepared in this research has good thermal insulation effect and good waterproof performance. In the stability evaluation of the thermal insulation structure of the steam pipe, it can be concluded that hard thermal insulation materials should be selected in the selection of thermal insulation materials. Its insulation effect is better than soft insulation material. In the thermal energy storage optimization of the thermal insulation structure, when the inner layer of the thermal insulation structure adopts 10 mm aerogel and the outer layer adopts 50 mm gel thermal insulation material, it is the optimal thermal insulation structure. The study has a good guiding effect on the economic benefit of steam pipe insulation structure.
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Shang, Lei, Yang Lyu, and Wenbo Han. "Microstructure and Thermal Insulation Property of Silica Composite Aerogel." Materials 12, no. 6 (March 26, 2019): 993. http://dx.doi.org/10.3390/ma12060993.
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Tetraethyl orthosilicate was selected as a matrix of heat insulating materials among three silanes, and an anti-infrared radiation fiber was chosen as a reinforcement for silica aerogel insulation composite. The silica aerogel was combined well and evenly distributed in the anti-infrared radiation fiber. The heat insulation effect was improved with the increase in thickness of the aerogel insulation material, as determined by the self-made aerospace insulation material insulation performance test equipment. The 15 mm and 30 mm thick thermal insulation material heated at 250 °C for 3 h, the temperatures at the cold surface were about 80 °C and 60 °C, respectively, and the temperatures at 150 mm above the cold surface were less than 60 °C and 50 °C, respectively. The silica aerogel composites with various thicknesses showed good thermal insulation stability. The silica insulation composite with a thickness of 15 mm exhibited good heat insulation performance, meets the thermal insulation requirements of general equipment compartments under low-temperature and long-term environmental conditions. The thermal conductivity of prepared silica aerogel composite was 0.0191 W·m−1·k−1 at room temperature and 0.0489 W·m−1·k−1 at 500 °C.
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Lakatos, Ákos, and Attila Csík. "Multiscale Thermal Investigations of Graphite Doped Polystyrene Thermal Insulation." Polymers 14, no. 8 (April 14, 2022): 1606. http://dx.doi.org/10.3390/polym14081606.
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Nowadays, to improve quality of life, to have a more comfortable life, in internal spaces we try to maintain conditions that are free from external environmental influences. Thus, existing as well as newly built houses have adequate interiors maintaining their temperature, warming, or cooling due to the environment compensation. One way to create this is to reduce the heat loss in buildings. An option to achieve this is the application of thermal insulations. Nowadays, the use of super insulation materials such as aerogel and vacuum insulation panels and other nano-structured insulations, such as graphite doped expanded polystyrene, is becoming increasingly justified. These are relatively new materials, and we know only a little about them. This paper presents research results based on temperature-induced investigations of nanostructured graphite expanded polystyrene, to reveal its thermal stability after long-term and short-term thermal annealing, simulating the ageing of the material. Firstly, with a differential scanning calorimeter, we will explore the thermal stability profile of the specimens. After this, the paper will present temperature-induced changes in both the thermal properties and the structure of the samples. We will also present changes in the thermal conductivity, modifications in the surface, and compressive property variation induced by thermal annealing. The samples were thermal annealed at 70 °C for 6 weeks, at 100 and 110 °C for 1 h. Besides the thermal conductivity measurements with Netzsch 446 heat flow meter equipment, we will present specific heat capacity measurement results executed with the same equipment. Moreover, sorption isotherms of the as-received and annealed samples were registered and completed with hydrophobic experiments, too. Furthermore, from the measurements, we showed that temperature should affect a significant change in the thermal conductivity of materials. Moreover, the changes in the graphite expanded polystyrene before and after thermal annealing were investigated by Scanning Electron Microscopy, as well as optical microscopy. The structural changes were further followed by an X-ray diffractometer and the IR absorption capability was tested, too.
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Vankov, Yuri, Elvira Bazukova, Dmitry Emelyanov, Alexander Fedyukhin, Olga Afanaseva, Irina Akhmetova, and Umberto Berardi. "Experimental Assessment of the Thermal Conductivity of Basalt Fibres at High Temperatures." Energies 15, no. 8 (April 11, 2022): 2784. http://dx.doi.org/10.3390/en15082784.
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This paper investigates fibrous thermal insulation materials of various densities to assess the change in their thermophysical properties at high temperatures. The thermal conductivity of fibrous thermal insulation materials is discussed as a function of the temperature in the range from 50 °C to 500 °C. It is shown that the thermal insulating properties depend not only on the physical properties of the material (e.g., density or diameter of fibres), but also on the geometric parameters of the structure and on the orientation of the fibres. The influence of high temperatures on the mass change of fibrous materials associated with the burnout of synthetic binders is shown. These features should be taken into account during the design of thermal insulation operating at high temperatures to provide the optimal selection of the material and to guarantee the stability of their thermal properties.
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Vozhakov, R., and V. Kyrylenko. "THE INFLUENCE OF EXTRANEOUS SOURCES OF THERMAL ENERGY ON THERMAL STABILITY AND BREAKDOWN VOLTAGE OF ELECTRICAL INSULATION DURING ITS THERMAL BREAKDOWN." Tekhnichna Elektrodynamika 2021, no. 2 (February 23, 2021): 20–25. http://dx.doi.org/10.15407/techned2021.02.020.
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The article is devoted to the analysis of thermal breakdown of insulation of electrical and power equipment due to disturbance of its thermal balance. The analysis was performed within the simplest model of thermal breakdown while ignoring the temperature distribution in the insulation volume. Particular attention is paid to the influence of extraneous sources of thermal energy on the thermal stability and the breakdown voltage of the electrical insulation structure. From the heat balance equation and the condition of thermal balance disturbance between the total thermal power in the insulation and the heat transferred into the surroundings, have been found analytical expressions that take into account the influence of extraneous sources of thermal energy on the critical operating temperature and the breakdown voltage of the insulation. The influence of extraneous sources of thermal energy on the dependence of the breakdown voltage on the dielectric parameters and the cooling conditions was analyzed. It is shown that the breakdown voltage of the insulation decreases exponentially with the increase of the power of extraneous heat sources and the temperature coefficient of tgδ, as well as the deterioration of the heat transfer conditions. It is established that the critical dielectric losses in the insulation leading to the breakdown do not depend on the power of extraneous sources of thermal energy. It is proposed to increase the electrical insulation safety factor for breakdown strength relatived to its operating voltage, taking into account the extraneous sources of heat, to ensure the stability of insulation against thermal breakdown in the presence of extraneous sources of thermal energy. References 10, figures 3.
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Zhang, Hua, Jun Lai, Yan Gao, Kan Lai, and Wei Shi. "The Influence of Different Fire Resistance Materials on the Thermal Protection Property of Firefighter Uniform." Advanced Materials Research 785-786 (September 2013): 729–34. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.729.
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Based on the thermal stability test on the different fire resistance materials, this article study the Thermal protection property (TPP) of the different materials composite structure and analyses the effect that the materials changes on the TPP of the composite structure products. The results indicate that the thermal insulation batts made by Aramid fiber materials have excellent thermal stability, adding a certain percentage of Aramid fiber 1414 into the thermal insulation batts makes for the batts having stably insulation function, and it only needs 10% around additive amount to satisfy this demand, compared with polyimide and PPS, Aramid fiber 1414 have better thermal stability when encountered fire.
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Zhukov, Alexey, Tatiana Konoval’tseva, Ekaterina Bobrova, Ekaterina Zinovieva, and Kazbek Ivanov. "Thermal insulation: operational properties and methods of research." MATEC Web of Conferences 251 (2018): 01016. http://dx.doi.org/10.1051/matecconf/201825101016.
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Construction system consists of materials with different properties. The use of materials in the design should ensure maximum of its performance and its durability. The use of thermal insulation materials is an effective way to form the thermal envelope of a building, reducing energy costs and increasing the durability of building structures. The properties of materials are determined by their structure, which is formed in the process of technological influences. Formation of the insulating shell of oil and gas industry objects is possible only when considering the special features of the thermal insulation layer in the construction and the use of high-quality materials that retain their characteristics, both in the early stages of operation and throughout the calculation period. The first is achieved by competent design, the second the possibility of assessing the properties of thermal insulation (and predicting changes in these properties over time) directly in the construction site.The methodology for assessing the properties of insulating products includes two main components: testing facility and methodology for assessing operational stability. The methodology of conducting accelerated tests and prediction of durability is tested for mineral wool products of a layered, corrugated and volume-oriented structure. The test results give good convergence with the methods recommended by the building codes.
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Chen, Jin Ping. "Experimental Study of External Thermal Insulation Mortar Based on Fly Ash Floating Bead." Advanced Materials Research 476-478 (February 2012): 1643–46. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1643.
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In this paper, the development and properties of floating bead insulation mortar were introduced. Based on the experimental study, a new kind of exterior wall external thermal insulating mortar had been successfully produced. For this material, fly ash floating bead and expanded pearlite which was modified by hydrophobe were taken as the lightweight aggregate, meanwhile, Portland cement was used as the inorganic binder, also the fiber and polymer were taken as the additive. The results of experiments indicated that properties of fly ash floating bead insulating mortar, such as thermal insulation, strength, crack resistant and climate resistant, were superior to those of expanded pearlite insulating mortar. On the other hand, other properties, such as bulk stability, aging resistant, climate resistant, crack resistant and fireproofing, construction workability were much better than those of expanded polystyrene sheet ( EPS) insulating mortar.
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Moezzipour, Bita, and Aida Moezzipour. "Thermal Behavior of Insulation Fiberboards Made from MDF and Paper Wastes." Drvna industrija 72, no. 3 (July 22, 2021): 245–54. http://dx.doi.org/10.5552/drvind.2021.2019.
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Today, recycling is becoming increasingly important. In recycling process, the product performance should also be considered. In this study, manufacturing insulation fiberboard, as a practical wood product from recycled fibers, was investigated. For this purpose, two types of waste (MDF wastes and waste paper) were recycled to fibers and used for producing insulation fiberboards. The target fiberboard density was 0.3 g/cm3. The ratio of waste paper to MDF waste recycled fibers (WP/RF) was considered at two levels of 70/30 and 50/50. Polyvinyl acetate adhesive was used as a variable in the board manufacturing process. The mechanical properties, dimensional stability, thermal conductivity, and fire resistance of the boards were evaluated. Besides, the thermal stability of fiberboards was studied using thermal analysis including thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results showed that the insulation fiberboards had admissible mechanical properties and dimensional stability. The manufactured boards displayed low thermal conductivity, which proved to be well competitive with other insulation materials. The fiberboards manufactured with PVAc adhesive and WP/RF ratio of 50/50 had higher fire resistance compared to other treatments. Additionally, results of thermal analysis showed that the use of PVAc adhesive and WP/RF ratio of 50/50 leads to improved thermal stability. Overall, the recycled fibers from MDF and paper wastes appear to be appropriate raw materials for manufacturing thermal insulation panels, and use of PVAc adhesive can significantly improve thermal and practical properties of insulation fiberboards.
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Liu, DT, KF Xia, RD Yang, J. Li, KF Chen, and MM Nazhad. "Manufacturing of a biocomposite with both thermal and acoustic properties." Journal of Composite Materials 46, no. 9 (January 17, 2012): 1011–20. http://dx.doi.org/10.1177/0021998311414069.
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The present work describes a biocomposite with thermal and acoustic insulating properties from agricultural or forestry residues using a steam injection molding technique. The biocomposites showed reasonable thermal insulation properties as judged based on their thermal conductivity, thermal diffusivity, and thermal stability data. The biocomposites had also good sound absorption properties. The dimensional stability of the biocomposites under accelerated weathering conditions was almost ideal. Although the flame retardancy of the biocomposites had rating acceptable to building products, it was yet concluded that for the biocomposites to have a wider market share, their flame-retardant capacity should be improved.
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Grigoryan, Artak A., Karapet A. Ter-Zakaryan, Alexander I. Panchenko, Nadezhda A. Galceva, and Vladislav I. Krashchenko. "Heat- and cooling systems." Stroitel stvo nauka i obrazovanie [Construction Science and Education], no. 4 (December 31, 2019): 7. http://dx.doi.org/10.22227/2305-5502.2019.4.7.
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Introduction. The article discusses the various aspects of the use of foamed polyethylene, implemented at sports facilities in Armenia. Firstly, it is a roof insulation system. Secondly, the implementation of insulation systems to preserve the cold in the territory of open sports facilities, in particular, to preserve snow reserves in ski resorts. Additional requirements are imposed on the thermal insulation material for such structures. The material, in addition to high thermotechnical properties, must be airtight, lightweight, easy to install and maintain, durable, resistant to infection by bacteria and fungi, it is easy to tolerate temperature extremes. Materials and methods. The article presents the results of a study of the properties (heat conductivity density, vapor permeability, water absorption) and application features (resistance to the effects of temperature, humidity, aggressive components contained in the air, that is, its high operational stability) of rolled non-cross-linked polyethylene foam when creating insulating sheets that protect snow from melting. Results. It was found that polyethylene foam in the insulating system maintains the stability of mechanical and thermophysical properties. Taking into account all the functional features of the implementation of insulation systems, the principles of protection and preservation (conservation) of snow cover have been developed, implemented on the mountain slopes and plateau of ski facilities. Rolls of foamed polyethylene were joined end-to-end and mechanically fixed. Conclusions. Thus, a seamless insulating coating was formed, covering the entire hillside — “thermal blanket”. The insulation system is operated during the off-season between March and September, during a period of stable positive temperatures.
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Lingvay, Iosif, Gabriela Oprina, Valerica Stanoi, Alexandra Pica, Livia Carmen Ungureanu, and Florentina Serban. "Studies on the Influence of Copper and Insulation Paper on the Accelerated Thermal Ageing of Some Insulating Fluids." Revista de Chimie 68, no. 11 (December 15, 2017): 2551–55. http://dx.doi.org/10.37358/rc.17.11.5926.
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The behaviour of some insulating fluids in contact with copper foil and / or insulation paper under thermal stress (110�30C for 1000 hours), in a closed system (the access of atmospheric oxygen being limited), has been studied by determining the changes in viscosity and concentration of CO2 and CO. The experimental data revealed that, following the applied heat treatment, the change in viscosity of the esters-based insulating fluids (both synthetic and vegetable) is approximately 7 times lower than in the case of the investigated mineral oils. It has also been found that, following the thermal ageing, the gas content of the mineral oils is substantially higher than in the esters-based oils (8 times higher for CO2 and 4 times higher for CO, respectively). The experimental results indicate superior values for the thermal stability and compatibility with the insulation paper of ester-based insulating fluids.
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Silviana, S., A. N. Sa’adah, R. P. Deastuti, N. C. Ramadhani, N. Simarmata, L. E. Arianto, M. Y. Tiurma, J. Rahmaningrum, F. Fauzi, and M. A. S. Mahmud. "Synthesis of silica-cellulose aerogel derived from bagasse through impregnation and ambient pressure drying methods as thermal insulator." IOP Conference Series: Earth and Environmental Science 963, no. 1 (January 1, 2022): 012027. http://dx.doi.org/10.1088/1755-1315/963/1/012027.
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Abstract The trend of research and development of technological advancement in thermal insulators involves using renewable materials, selecting manufacturing processes that require the lowest possible energy, or using waste materials that may help subdue the reduction of petroleum reserves. This review discusses the potential substitution of petroleum by natural materials in thermal insulation manufacturing. This review presents an overview of the definition, properties, materials, and methods that can be used in the manufacture of thermal insulators based on results reported in the literature. Many materials are currently being investigated to produce thermal insulator such as cellulose. Cellulose fiber has a big potential to be used in the manufacture of thermal insulators because cellulose possesses many advantageous properties over petroleum-based polymers, i.e. biocompatibility, biodegradability, thermal stability, chemical stability, and low cost. Another material that may be used is silica, as it has high temperature resistance and low thermal expansion. Bagasse containing high cellulose and silica with the composition of 32-44% cellulose and 55.5%-70% silica. Therefore, bagasse proves appealing to be processed into thermal insulator. Aerogels are among the best thermal insulating materials known. This review proposes the impregnation method followed by the ambient pressure drying (APD) method to synthesize cellulose-silica aerogel. The impregnation of silica into cellulose aerogel will increase mechanical strength, flexibility, and the resulting silica-cellulose aerogel will be transparent with a very low thermal conductivity.
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Gudkov, Pavel, Pavel Kagan, Anton Pilipenko, E. Yu Zhukova, E. A. Zinovieva, and N. A. Ushakov. "Usage of thermal isolation systems for low-rise buildings as a component of information models." E3S Web of Conferences 97 (2019): 01039. http://dx.doi.org/10.1051/e3sconf/20199701039.
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The article discusses the possibility of using the criteria of energy saving, cost and comfort as an estimate criterion in the analysis of information modeling technologies for low-rise buildings at the stages of design, implementation and operation. The insulation systems of low-rise buildings, including frame type, are considered as an object of study. Different types of insulation systems of frame buildings are considered and, as a result, the expediency of using rolled polyethylene foam as an insulating material is established. Its use allows to form a seamless insulating sheath with minimization of heat transfer bridges, as well as to eliminate the use of additional wind-proof and vapor-insulating membranes. The regularities of the influence of operating factors on the thermal resistance of the insulating shell are established. The data obtained as a result of the implementation of experimental studies allow us to state that low water absorption and low vapor permeability of the insulating layer exclude the possibility of its wetting and degradation of heat-shielding parameters. The stability of the properties of the insulation sheath and the construction of the walls as a whole is ensured during the entire period of operation.
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Luo, Yi Ying, Xiao Yan Wu, Yi Xiang, and Zhi Rong Niu. "Temperature Comparison of External Thermal Insulation Wall Using Foam Glass under Thermal and Humidity Effect." Advanced Materials Research 873 (December 2013): 257–66. http://dx.doi.org/10.4028/www.scientific.net/amr.873.257.
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Experiments are performed aiming at the hot summer and cold winter area climate characteristics. The BWNH-3021 type weather-resistant testing apparatus is used to achieve performances of foam glass exterior thermal insulation walls. Real-time temperatures of each functional layer are tested under hot rain cycle effect. The temperature curves are plotted to make comparisons. When the environment temperature rises about 60°C, the temperatures of primary wall will rise only 8.20°C9.30°C each in 1#2# testing wall. When cold water is suddenly sprayed, the environment temperature will fall about 51°C. Then the temperatures of primary wall will fall only 4.00°C4.20°C each in 1#2# testing wall. It shows the good thermal insulating property of foam glass exterior thermal insulation wall. The environment temperature fluctuation can also be eliminated significantly. Attenuation coefficients of different thermal insulation walls are calculated. The maximum attenuation coefficients are present when temperature is rising. The coefficients of 1#2# testing wall are 15.00 and 4.60 separately. And the delay-times of two walls are 148min133min respectively. Both of the total attenuation coefficient and delay-time of 1# wall are greater than those of 2# wall. It indicates that a thicker layer makes the temperature wave decays more and takes longer time to delay. It proved that a thicker external thermal insulation structural layer contributes to the resistance of temperature fluctuation and thermal stability.
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Pinchevska, O. O., and D. L. Zavialov. "Properties of new thermal insulation material from low-quality pine wood." Ukrainian Journal of Forest and Wood Science 11, no. 2 (June 30, 2020): 91–100. http://dx.doi.org/10.31548/forest2020.02.091.
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Recently growing number of low quality wood in Ukraine, damaged by fungal sap color, stem rot leads to finding ways to use it. Today this wood is used mainly for the manufacture of wood-fuels facility in industrial and municipal energy. A possible way to use it is making insulation material from wood wool. The existing prototype of such material - fibrolite contains woody wool of healthy wood but during burning emits toxic chemicals. The construction of wooden wall panels, which include a frame of lumber and thermal insulation material of wood wool, made of low quality pine wood and binder. The binder used were inorganic (liquid glass) and organic-mineral (PVA) dispersion with the addition of flame retardant. Investigation of fire resistance, acoustic and thermal insulation of material from low quality pine wood have proved that it meets the regulatory requirements and can be used in building structures. To develop technological requirements for the manufacture of wall panels using low-quality pine wood, it is necessary to determine their density, sorption capacity and bio-stability. For this purpose, samples of thermal insulation material with different content of mass parts of wood wool and binder were made. The density of specimens of insulating material (145‒250 kg/m3), which is close to the popular hard thermal insulation materials, has been determined. Experimental studies of moisture absorption, sorption capacity and swelling values indicated that the effect of moisture on the properties of insulating material and its shape resistance are within the permissible values of regulatory documents for construction products. Wood treated with binders found to be used for the manufacture of insulation material has been found to have high biological resistance, which is more than 5-6 times the bio-resistance of untreated wood.
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Mousa, Mohammed Imran, Zulkurnain Abdul-Malek, and Zainab Imran Mousa. "Leakage Current Based Thermal Modeling of Glass Disc Insulator Surface." Indonesian Journal of Electrical Engineering and Computer Science 6, no. 3 (June 1, 2017): 504. http://dx.doi.org/10.11591/ijeecs.v6.i3.pp504-512.
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The stability of transmission lines relies on the health of the insulators, such as glass string insulators, which may occasionally flashover during an overvoltage. The likelihood of flashover increases notably when the glass insulator is wrapped by a wet contaminant layer. In this paper a study of the surface thermal profile of glass disc insulators insulation had been carried out for both clean and polluted surfaces. A finite-element simulation with time dependent model was carried out using COMSOL Multiphysics software. The variation of the insulator surface temperature with applied voltage as well as with pollution layer thickness is explained. The results illustrate the significant effect of pollution conductivity on heat propagate along the surface of the glass insulators with the increase higher voltages' magnitudes. Study of the aging level impact on a steady state thermal for glass insulation surface is also carried out.
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Abu-Jdayil, Basim, Waseem Hittini, and Abdel-Hamid Mourad. "Development of Date Pit–Polystyrene Thermoplastic Heat Insulator Material: Physical and Thermal Properties." International Journal of Polymer Science 2019 (March 10, 2019): 1–10. http://dx.doi.org/10.1155/2019/1697627.
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This study is aimed at developing a thermoplastic composite based on date pit powder waste for use as a thermal insulator in building industries. Date pits are the by-product of date stoning, either for the production of pitted dates or for the manufacture of date paste. The date pit powder (DPP) used in this study was obtained from the UAE University farm in Al Foah, UAE. DPP waste contents ranging from 0 wt.% to 50 wt.% were used to prepare the DPP-polystyrene composite. Date pit powder was mixed with polystyrene using a melt extruder, and then the mixture was transferred to the hot press to produce the final sample. The thermal and physical characteristics of the produced composites were measured experimentally and analyzed theoretically in terms of date pit and polystyrene properties. The characterized properties of the DPP-polystyrene composites, namely, density, thermal conductivity, water retention, thermal stability, and microstructure, showed that a stable composite material with insulation and construction capacity can be formed by the addition of date pit powder to the polystyrene matrix. The theoretical modeling of the measured thermal conductivity and the scanning electron microscope (SEM) monographs supported the hypothesis of date pit agglomeration in the composite matrix. The prepared composites showed low thermal conductivity (0.0515-0.0562 W/m K at 25°C) and very low density (457-630 kg/m3), thus demonstrating their potential for use as a thermal insulator for building materials. In addition, replacing one-third of the classical construction wall content with DPP-polystyrene composite showed promise for constructive applications as a thermal insulator with 85% reduction in the overall thermal conductivity. Indeed, these properties are similar to those of other conventional insulating materials. This will lead to produce an inexpensive insulation material that exploits a common waste product in date fruit-producing countries.
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Ye, Chao, Xiufang Wen, Jia-ling Lan, Zhi-qi Cai, Pi-hui Pi, Shou-ping Xu, and Yu Qian. "Surface modification of light hollow polymer microspheres and its application in external wall thermal insulation coatings." Pigment & Resin Technology 45, no. 1 (January 4, 2016): 45–51. http://dx.doi.org/10.1108/prt-01-2015-0006.
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Purpose – The purpose of this paper is to modify light hollow polymer microsphere (LHPM) with titanium dioxide nanoparticles (nano-TiO2) to improve its compatibility with latex and apply the obtained nano-TiO2/LHPM composite particles in external wall thermal insulation coatings. Design/methodology/approach – The nano-TiO2/LHPM composite particles were prepared via vigorous stirring. The morphology and chemical composition of the produced nano-TiO2/LHPM composite particles were characterized using scanning electron microscopy, energy dispersion spectrum, thermo-gravimetric analyzer and Fourier transform infrared. The performance of this new composite coating was evaluated by checking its stability, density, radiation reflectivity, thermal conductivity and the resulting insulation temperature difference when forming coating film. Findings – It was found that a 9:1 mass ratio of nano-TiO2/LHPM with total 10 weight per cent composite particles in the thermal insulation paint showed low density, good stability, low thermal conductivity (0.1687 W/m·K) and high insulation temperature difference (5.8°C). Research limitations/implications – The LHPM can be modified by other nanoparticles to improve its insulation performance in thermal insulation coatings. Practical implications – This work provides a simple, robust, but effective approach to produce new thermal insulation coatings with nano-TiO2/LHPM composite particles. Originality/value – This method for surface modification of LHPMs is novel and the modified hollow polymer microspheres could be applied to external wall insulation coatings.
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Chen, Dai Guo, Yong Yao, Hai Jun Wang, Yu Ping Zhu, and Jiao Li Zou. "Experiment Research on Thermal Performance of Foam Concrete Wall." Applied Mechanics and Materials 488-489 (January 2014): 609–13. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.609.
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Foam concrete is a new building energy-saving material, which has the characteristics of light weight, heat insulation and fire prevention. The use of foam concrete slab with grooves cast roof or wall as a template can reduce the amount of the construction process, the cost of project and improve the structural thermal insulation properties. By testing the thermal defects and heat transfer performance of outer insulation and self-insulated wall, and analysis 2 kinds of wall’s heat transfer coefficient, thermal inertia indicators and technical and economic characteristics with Building Heat Transfer Theory, obtain : Foam concrete self thermal insulation wall indoor a hot environment, thermal stability and resistance against external temperature fluctuations is stronger; foam concrete self thermal insulation wall have a good heat transfer performance, and have better marketing prospects.
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Ren, Jingwen, Yan Qin, Zhengwei Peng, and Zhuangzhuang Li. "Influence of composite structure design on the ablation performance of ethylene propylene diene monomer composites." e-Polymers 21, no. 1 (January 1, 2021): 151–59. http://dx.doi.org/10.1515/epoly-2021-0015.
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Abstract By introducing functional fillers into the ethylene propylene diene monomer matrix, the anti-ablation, thermal insulation, and adhesive layer were prepared, respectively. We have studied the mechanical properties, ablation properties, thermal insulation properties, and bonding properties of different composite structures after design and analyzed the ceramic mechanism. The results showed that the content of ceramic fillers improved the thermal stability and ablation properties of anti-ablation layer composites. The formation of liquid structure can fill the hole defects and ablation pit. The foaming agent improved thermal insulation properties of the thermal insulation layer, and the strength of the bonding layer has been greatly improved. The design of the composite structure can not only reduce the density but also have an excellent thermal insulation effect. And as the thickness of the heat insulation layer increases, the heat blocking effect becomes more excellent.
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Mashkin, Nikolay, Ekaterina Bartenjeva, and Rustam Mansurov. "Naturally cured foamed concrete with improved thermal insulation properties." MATEC Web of Conferences 143 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201814302005.
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The paper is dedicated to investigation on improvement of thermal insulation properties of non-autoclaved concrete by increasing aggregate stability of foamed concrete mixture. The study demonstrates influence of mineral admixtures on the foam stability index in the mortar mixture and on decrease of foamed concrete density and thermal conductivity. The effect of mineral admixtures on thermal conductivity properties of non-autoclaved concrete was assessed through different ways of their addition: to the foam and to the mortar mixture. The admixtures were milled up to the specific surface area of 300 and 600 m2/kg using an AГO-9 centrifugal attrition mill with continuous operation mode (Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk). Laboratory turbulent foam concrete mixer was used to prepare foamed concrete. Thermal conductivity coefficient was defined by a quick method using “ИTП-MГ 4 “Zond” thermal conductivity meter in accordance with the regulatory documents. The impact of modifiers on the foam structure stability was defined using the foam stability index for the mortar mixture. The research demonstrated the increase in stability of porous structure of non-autoclaved concrete when adding wollastonite and diopside. Improvement of thermal and physical properties was demonstrated, the decrease of thermal conductivity coefficient reaches 0.069 W/(m×°C)
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Xu, Tianlu, Jinrui Zhang, Lijie Qu, Xueyan Dai, Peihong Li, Yanlong Sui, and Chunling Zhang. "Fabrication of polysiloxane foam with a pendent phenyl group for improved thermal insulation capacity and thermal stability." New Journal of Chemistry 43, no. 16 (2019): 6136–45. http://dx.doi.org/10.1039/c9nj00782b.
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Petrov, G. I., N. S. Nikolaev, and V. N. Kornienko. "Modern materials for energy saving heat-insulating constructions of pipe-lines and heat exchange equipment." Meat Industry Journal, no. 10 (October 21, 2020): 46–50. http://dx.doi.org/10.37861/2618-8252-2020-10-46-50.
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Improvement of heat-insulating constructions is directly linked with the development of modern technological equipment due to an increase in its energy efficiency and energy saving during thermal treatment of meat and meat products. Thermotechnical characteristics and performance properties of protective coating materials of the trademark RU-FLEX intended for heat-insulating constructions of pipe-lines and equipment of meat industry enterprises were analyzed. Peculiarities of installation of thermal insulation RU-FLEX from foam rubber using different auxiliary materials to improve installation quality, stability to negative environmental effects and increase the service life were examined.
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Kim, Chan Hoo, Ji Hyun Choi, Sung Young Park, Hyung Chae Lee, Sang Jin Lee, and Goun Kim. "Analytical Study of Insulation Characteristics of Thermal Batteries with Vacuum Insulation." Defect and Diffusion Forum 412 (November 12, 2021): 141–47. http://dx.doi.org/10.4028/www.scientific.net/ddf.412.141.
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In this study, a thermal battery is designed with vacuum insulation to improve its thermal insulation. Thermal insulation is one of the many factors that determine the stability and operation of the battery. The battery’s operating time as well as the improvement in its thermal insulation performance were analyzed. The location of the vacuum insulation was set as a variable in the analysis models. The thermal battery was subjected to unsteady heat transfer analysis until the electrolyte temperature reached 450°C. Vacuum insulation was applied to the part of the base thermal battery to fabricate three model batteries. Compared with the base model B, the operating time increased by 48% for the model BS, 76% for the model BSB, and 179% for the model BSBT. Due to the large area of the side, a large amount of heat was transferred; the quantity of heat transfer was in the order B>BS>BSB>BSBT. In the model BSBT, the heat loss per unit area was reduced by 93% at the side, top, bottom compared with the base model. The results of this study will serve as basic data for the design of thermal batteries with vacuum insulation and for improvement in insulation performance.
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Lin, Ling, and Chaoxia Wang. "Thermal insulating property of an optically-active polyurethane-based silicon aerogel." Thermal Science, no. 00 (2021): 133. http://dx.doi.org/10.2298/tsci201001133l.
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Improving the mechanical property of the silicon aerogel while maintaining its excellent thermal insulation performance is still a big challenge in developing the next-generation thermal insulation materials. To solve this problem, the optically active polyurethane aerogel composite is developed via the sol-gel method to combine the advantages of the thermal insulation performance of the silicon aerogel and the mechanical property of the end-capped siloxane optically-active polyurethane. The prepared composite is characterized by the scanning electron microscopy, the Fourier transform infrared spectroscopy, the absorption-desorption curve, the thermal analysis, and the mechanical property. Results show that the composite has intact pores with high surface area and pore volume, leading to excellent thermal insulation and mechanical performance. Moreover, its thermal insulation performance is greatly enhanced due to the better distributed small pores and the thermal reflective effect of binaphthyl groups which collaboratively block heat loss from thermal conduction and thermal radiation. The thermal stability is similar to silicon aerogel and its heat resistance temperature is 445?. The addition of macromolecular polymers increases the contact points between particles, the contact areas between particles of the network skeletons, and the supporting effect of the skeleton material, which ensures the stability of the material structure. The compressive modulus of prepared composite is up to 2.465 MPa, which is 600 times more than that of the pure SiO2 aerogels.
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Zhang, Shi Chao, Wei Wu, Yu Feng Chen, Liu Shi Tao, Kai Fang, and Xian Kai Sun. "Preparation and Properties of Phase Change Thermal Insulation Materials." Solid State Phenomena 281 (August 2018): 131–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.131.
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With the increase of the speed of vehicle, the thermal protection system of its powerplant requires higher insulation materials. Phase change materials can absorb large amounts of heat in short time. So the introduction of phase change materials in thermal insulation materials can achieve efficient insulation in a limited space for a short time. In this paper, a new phase change thermal insulation material was prepared by pressure molding with microporous calcium silicate as matrix and Li2CO3 as phase change material. The morphology stability, exudation and heat insulation of the materials were tested. The results show that the porous structure of microporous calcium silicate has a good encapsulation when the phase transition of Li2CO3 is changed into liquid. And the material has no leakage during use. The thermal performance test also shows that the insulation performance of the material has obvious advantages in the short term application.
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Dai, Jing, Chao Peng, Shuyue Zhang, Shun Wu, Minxian Shi, and Zhixiong Huang. "Investigation on the Mechanical and Thermal Insulation Properties of Hollow Microspheres/Phenolic Syntactic Foams." Advances in Materials Science and Engineering 2022 (March 28, 2022): 1–10. http://dx.doi.org/10.1155/2022/2509090.
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Hollow microspheres are widely used in syntactic foam as a lightweight filling material. Hollow glass microspheres (HGM) and hollow phenolic microspheres (HPM) were added to the phenolic resin to prepare phenolic syntactic foams. Then the mechanical properties, thermal insulation properties, and thermal property stability of them were studied. The mechanical test result shows that the flexural strength of phenolic syntactic foam gradually decreases with the increasing volume fraction of microspheres at room temperature. When the volume fraction of HGM is 20%, the specific strength of phenolic syntactic foam can rise to 0.0334 Nm/kg. HGM reduces the density of the phenolic syntactic foam and remains at high strength. In addition, the thermal conductivity of phenolic syntactic foam decreases with the increasing volume fraction of the hollow microspheres, indicating that the microspheres can effectively improve the thermal insulation performance of the phenolic syntactic foam. Meanwhile, the thermal conductivity of phenolic syntactic foam also increases as the heat treatment temperature rises. In addition, the thermal insulation performance of phenolic syntactic foam containing HGM is better than that containing HPM. Thermal analysis experiments show that the thermal weight loss rate becomes slower as the content of HGM increases. Therefore, HGM improves the thermal stability of the containing phenolic syntactic foam. However, the HPM reduces the thermal decomposition temperature and the thermal stability of the phenolic syntactic foam. This work provides the technical basis for applying phenolic syntactic foam as a heat insulation material.
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Hao, Ya Han, and Li Jie He. "Experimental Study on Seismic Stability of Shear Wall by Laying Insulated Shale Hollow Brick outside." Advanced Materials Research 446-449 (January 2012): 269–73. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.269.
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Based on the low cyclic reversed lateral loading tests of shear wall thermal insulation brick wall on build by laying bricks, shale brick masonry wall thermal insulation of the failure pattern, deformation and stability and seismic performance ability and shear wall deformation, the seismic performance were analyzed. The results of the study show that the shale hollow brick wall insulation bricks with a good seismic performance stability. If vertical slits were set properly, the transformative property of the shear wall was improved greatly and the seismic behavior was excellent under the condition that the bearing capacity decreased slightly.
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Lisa, Gabriela, Andreea-Camelia Spranceana, Mihaela Darie, Simona Ciausu, and Nita Tudorachi. "COMPARATIVE ANALYSIS OF THERMAL STABILITY OF BUILDING INSULATION MATERIALS." Environmental Engineering and Management Journal 16, no. 12 (2017): 2831–42. http://dx.doi.org/10.30638/eemj.2017.292.
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Tang, Chao, Wei Zheng, Lihan Wang, and Jufang Xie. "Thermal stability of polyphenylsilsesquioxane‐modified meta‐aramid insulation paper." High Voltage 5, no. 3 (June 2020): 264–69. http://dx.doi.org/10.1049/hve.2019.0266.
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Li, Hongyan, Yongqiang Fu, Hongli Liu, Cong Sun, Ruyi Li, Limeng Song, Aiwu Yang, and Dongqing Wei. "Thermo-oxidative and thermal degradation kinetics of silica/polymethyl methacrylate composites with electrostatic interaction phase interfaces." Journal of Polymer Engineering 39, no. 2 (February 25, 2019): 105–16. http://dx.doi.org/10.1515/polyeng-2018-0089.
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AbstractThe thermo-oxidative and thermal degradation kinetic parameters of polymethyl methacrylate-methacryloxyethyltrimethyl ammonium chloride/silica aerogel composites (PMMA-MTC/SA) were investigated in this paper and were compared with the thermal stability and thermal conductivity of different types of composites. As a composite with electrostatic interaction, the thermo-oxidative and thermal degradation activation energies (E) of PMMA-MTC/SA were 173.97 and 188.05 kJ/mol, respectively. The results indicated that the electrostatic interaction could indeed enhance the thermal stability of silica/polymethyl methacrylate composites on the premise of good mechanical properties and heat insulation performance. It is of great significance for the further development of silica-based thermal insulation composites.
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Cardoso, C., and S. Jalali. "Thermal Performance Characterization of a Modular System for Facade." Key Engineering Materials 634 (December 2014): 62–71. http://dx.doi.org/10.4028/www.scientific.net/kem.634.62.
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The developed system corresponds to multifunctional prefabricated modular elements that combine an insulation layer with a cast coating material for exterior that can imitate stone or concrete. These systems need auxiliary elements of fixing to connect them mechanically to the structural wall of the building, in order to ensure its stability, using anchorage, profiles, rails, among others. The use of these systems connected to the coating interrupts the continuity of thermal insulation, causing additional heat losses through linear and point thermal bridges, having an detrimental effect on thermal performance of the system. The development of fixing of present multifunctional panels was based on the evaluation and adoption of appropriate solutions in order to minimize thermal bridges and reinforce the stability of the panel. For evaluation purposes some models are evaluated, with different connecting systems, configurations and different materials such as aluminium, stainless steel, galvanized steel and Glass Fibre Reinforced Polymer (GFRP) profiles. The quantification of thermal bridges, for evaluation of thermal performance, has been made using computing programs, HEAT2 and HEAT3. The evaluation of a system developed in this research work, i.e. incorporating profiles in thermal insulation, shows a good thermal resistance contributing significantly to the thermal insulation and energy conservation in building.
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Zhang, Chunyu, Lijie Qu, Yingnan Wang, Tianlu Xu, and Chunling Zhang. "Thermal insulation and stability of polysiloxane foams containing hydroxyl-terminated polydimethylsiloxanes." RSC Advances 8, no. 18 (2018): 9901–9. http://dx.doi.org/10.1039/c8ra00222c.
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Li, Ke Cheng, Zhan Jun Wu, Min Jing Liu, Xin Sheng Xu, and Wang Xu. "An Application of Reinforced Polyurethane Foam in Design of the Common Bulkhead for Cryogenic Tanks." Materials Science Forum 975 (January 2020): 182–87. http://dx.doi.org/10.4028/www.scientific.net/msf.975.182.
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By using the material of reinforced polyurethane (RPU) foam, the common bulkhead is devised for cryogenic tanks in this paper. Properties of RPU foam are obtained through experiments. Based on the properties, the structure is designed with the integration of special features including lightweight, easy to manufacture, load bearing and thermal insulation. Based on numerical simulation, thermal analysis, stability and thermal mechanical coupling behavior of the structure are analysed. The results show that the common bulkhead not only satisfies the heat insulation requirements of cryogenic tanks for liquid hydrogen and oxygen, but also keeps stability.
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Liu, Dong, and Anjie Hu. "The Influence of Environmentally Friendly Flame Retardants on the Thermal Stability of Phase Change Polyurethane Foams." Materials 13, no. 3 (January 22, 2020): 520. http://dx.doi.org/10.3390/ma13030520.
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To improve thermal insulation, microencapsulated phase change materials (micro-PCMs), expandable graphite (EG), and ammonium polyphosphate (APP) were introduced into polyurethane foam (PUF) to enhance the thermal stability and improve the thermal insulation behavior. The morphology of the PUF and micro-PCM was studied using a scanning electronic microscope (SEM), while the thermophysical properties of the PUF were investigated using a hot disk thermal constants analyzer and differential scanning calorimetry (DSC). The thermal stability of the PUF was investigated by thermogravimetric analysis (TGA), and the gas products volatilized from the PUF were analyzed by thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TGA-FTIR). The results revealed that the thermal conductivities of the PUF were reduced because micro-PCM is effective in absorbing energy, showing that the PUF functions not only as a thermal insulation material but also as a heat sink for energy absorption. Moreover, the EG and APP were found to be effective in improving the thermal stabilities of the PUF, and the optimized formulation among EG, APP, and micro-PCMs in the PUF showed a significant synergistic effect.
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ZOU, PING, JIAN LI, CAI-XIN SUN, ZHAO-TAO ZHANG, and RUI-JIN LIAO. "DIELECTRIC PROPERTIES AND ELECTRODYNAMIC PROCESS OF NATURAL ESTER-BASED INSULATING NANOFLUID." Modern Physics Letters B 25, no. 25 (October 10, 2011): 2021–31. http://dx.doi.org/10.1142/s0217984911027285.
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Natural ester is currently used as an insulating oil and coolant for medium-power transformers. The biodegradability of insulating natural ester makes it a preferable insulation liquid to mineral oils. In this work, Fe 3 O 4 nanoparticles were used along with oleic acid to improve the performance of insulating natural ester. The micro-morphology of Fe 3 O 4 nanoparticles before and after surface modification was observed through transmission electron microscopy. Attenuated total reflection-Fourier transform infrared spectroscopy, thermal gravimetric analysis, and differential thermal analysis were employed to investigate functional groups and their thermal stability on the surface-modified Fe 3 O 4 nanoparticles. Basic dielectric properties of natural ester-based insulating nanofluid were measured. The electrodynamic process in the natural ester-based insulating nanofluid is also presented.
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Zhao, Juan, Guanjie Zeng, Fangxin Zou, Shaohua Jiang, Yeqing Chen, Haiping Wang, Chenzhong Mu, and Xiu-Zhi Tang. "Bismaleimide bridged silsesquioxane aerogels with excellent heat resistance: effect of sol–gel solvent polarity." Soft Matter 16, no. 14 (2020): 3548–54. http://dx.doi.org/10.1039/d0sm00029a.
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Bismaleimide bridged silsesquioxane aerogels with tailorable micro-structures exhibit superhydrophobicity, stable wettability, good compressive toughness, good thermal stability and thermal insulation.
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Zach, Jiri, Martin Sedlmajer, and Jitka Hroudová. "Development of Building Elements with Thermal Insulation Filler Based on Secondary Raw Materials." Advanced Materials Research 649 (January 2013): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.649.147.
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With increasing requirements for properties of envelope design in respect of thermal protection of buildings also requirements for building material properties have been growing. In case of ceramic shaped pieces for peripheral structures the way to further improvement of its thermal insulation properties is quite difficult. Generally thickness of interior groins can be reduced and its geometrical layout changed or the ceramics blocks dimensions increased and thus width of the masonry construction. Use of insulation filler integrated in block cavities is the alternative technology of production of insulation special shapes of high insulation properties. In these cases the ceramic fragment ensures the mechanical stability of the block and integrated insulation layer in smaller or bigger part (depending on its part) the thermal properties and eventually also the acoustic and insulation ones. The paper describes application possibilities of insulation materials based upon waste textile fibres as integrated layer in current masonry ceramic blocks of high utility properties.
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Liu, Panlin, Jiheng Ding, Shengpei Su, and Hiabin Yu. "A universal strategy for high-yield producing water compatible boron nitride nanosheets." New Journal of Chemistry 44, no. 45 (2020): 19812–19. http://dx.doi.org/10.1039/d0nj04674d.
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Ene, Alexandra Gabriela, and Carmen Mihai. "Eco-Friendly Thermal Insulation Structures Based on Natural and Biodegradable Materials for Environmentally Durable Development." Solid State Phenomena 305 (June 2020): 97–102. http://dx.doi.org/10.4028/www.scientific.net/ssp.305.97.
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Worldwide, natural fiber insulation is in high demand, offering not only thermal comfort but also soundproofing. Another important aspect for which these biodegradable materials is popular is that it presents no health risk. Due the soft texture, natural fibers can be introduced very simply in any type of construction. Regardless of the vertical or inclined mounting, the stapling or gluing of the material gives stability. For example, the wool insulation is made from natural fibers, washed and treated. These wool fibers are held together either mechanically or using up to 12% polyester fibers to form semi-rigid tiles/mattresses or rollers. With a higher price than mineral wool, natural insulation is ideal for eco-friendly wooden houses. Depending on the type of construction, the wool can be mounted in a single layer or several layers, of different thicknesses [1]. For the evaluation of the thermal efficiency of the wool panel’s insulation four variants of insulating panels based on 100% wool were accomplished. Using a specialized simulation program, it is found that the heat losses through the walls themselves represent 86% of the total heat loss and the heat losses through the windows/doors to the outside represent 14% of the total heat losses.
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Li, Jin Mei, Jia Qing Zhang, Qiang Li, and Zi Dong Guo. "Thermal Aging Effects on Fire Performance of the Cross-Linked Polyethylene Insulated Cable." Materials Science Forum 898 (June 2017): 2399–404. http://dx.doi.org/10.4028/www.scientific.net/msf.898.2399.
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To evaluate the fire performance of the cable in service, the ignition time, heat release rate and insulation failure parameters of the accelerated thermal aging cable on stimulated fire condition were studied. The results show that, the extended ignition time and decreasing peak of heat release rate of the cable in the early stage of aging are the addictive including the lubricant, plasticizer and anti-oxygen. In the aggravating of thermal aging, labile materials with low heating value will be exhausted, while the thermal stability of insulation sheath material decreases, its corresponding ignition time will start to shorten and initial peak of heat release rate will start to rise. The insulation failure temperature of the cable is related with the decomposition temperature of insulation materials of the cable by heating. In each aging stage, the decomposition temperatures of insulation materials by heating are all lower than the insulation failure temperature of the cable for about 10°C. The reason for the insulation failure of the cable is that the ambient heat , gives rise to the decomposition by heating of internal insulation materials of the cable through sheath materials finally under the thermal transmission effect.
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Hou, Jun, Guohua Li, Na Yang, Lili Qin, Maryam E. Grami, Qingxin Zhang, Nongyue Wang, and Xiongwei Qu. "Preparation and characterization of surface modified boron nitride epoxy composites with enhanced thermal conductivity." RSC Adv. 4, no. 83 (2014): 44282–90. http://dx.doi.org/10.1039/c4ra07394k.
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The fabricated surface modified boron nitride epoxy composites exhibit high thermal conductivity, superior thermal stability and good mechanical properties while retaining good electrical insulation properties.
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Illera, Danny, Jaime Mesa, Humberto Gomez, and Heriberto Maury. "Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges." Coatings 8, no. 10 (September 28, 2018): 345. http://dx.doi.org/10.3390/coatings8100345.
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Cellulose-based aerogels hold the potential to become a cost-effective bio-based solution for thermal insulation in buildings. Low thermal conductivities (<0.025 W·m−1·K−1) are achieved through a decrease in gaseous phase contribution, exploiting the Knudsen effect. However, several challenges need to be overcome: production energy demand and cost, moisture sensitivity, flammability, and thermal stability. Herein, a description and discussion of current trends and challenges in cellulose aerogel research for thermal insulation are presented, gathered from studies reported within the last five years. The text is divided into three main sections: (i) an overview of thermal performance of cellulose aerogels, (ii) an identification of challenges and possible solutions for cellulose aerogel thermal insulation, and (iii) a brief description of cellulose/silica aerogels.
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Siqueira, Felippe Fabrício dos Santos, Renato Lemos Cosse, Fernando Augusto de Noronha Castro Pinto, Paulo Henrique Mareze, Caio Frederico e. Silva, and Lívio César Cunha Nunes. "Characterization of Buriti (Mauritia flexuosa) Foam for Thermal Insulation and Sound Absorption Applications in Buildings." Buildings 11, no. 7 (July 5, 2021): 292. http://dx.doi.org/10.3390/buildings11070292.
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Exploring new construction materials with low environmental impact leads to innovation in buildings and also to the expansion of environmental sustainability in the construction industry. In this perspective, the thermal insulation and the sound absorption performances of Buriti (Mauritia flexuosa) foam were analyzed for potential application in buildings. This material is of plant origin, it is natural, renewable, abundant, and has a low environmental impact. In this research, characterizations were made by scanning electron microscopy (SEM), apparent density, thermogravimetry (TGA and DTG), thermal conductivity, and sound absorption. The SEM analysis revealed a predominantly porous, small, and closed-cell morphology in the vegetable foam. Due to its porosity and lightness, the material has an apparent density similar to other thermal insulating and sound-absorbing materials used commercially. The evaluation of thermogravimetric (TGA/DTG) results demonstrated thermal stability at temperatures that attest to the use of Buriti foam as a building material. Based on the thermal conductivity test, the Buriti foam was characterized as an insulating material comparable to conventional thermal insulation materials and in the same range as other existing thermal insulators of plant origin. Concerning sound absorption, the Buriti foam presented a low performance in the analyzed frequency range, mainly attributed to the absence of open porosity in the material. Therefore, understanding the sound absorption mechanisms of Buriti foam requires further studies exploring additional ways of processing the material.
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Claudivan da Silva, Francisco, Helena P. Felgueiras, Rasiah Ladchumananandasivam, José Ubiragi L. Mendes, Késia Karina de O. Souto Silva, and Andrea Zille. "Dog Wool Microparticles/Polyurethane Composite for Thermal Insulation." Polymers 12, no. 5 (May 11, 2020): 1098. http://dx.doi.org/10.3390/polym12051098.
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A polyurethane (PU)-based eco-composite foam was prepared using dog wool fibers as a filler. Fibers were acquired from pet shops and alkaline treated prior to use. The influence of their incorporation on the PU foams’ morphological, thermal, and mechanical properties was investigated. The random and disorganized presence of the microfibers along the foam influence their mechanical performance. Tensile and compression strengths were improved with the increased amount of dog wool microparticles on the eco-composites. The same occurred with the foams’ hydration capacity. The thermal capacity was also slightly enhanced with the incorporation of the fillers. The fillers also increased the thermal stability of the foams, reducing their dilatation with heating. The best structural stability was obtained using up to 120 °C with a maximum of 15% of filler. In the end, the dog wool waste was rationally valorized as a filler in PU foams, demonstrating its potential for insulation applications, with a low cost and minimal environmental impact.
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Umnyakova, Nina, Igor Bessonov, Alex Zhukov, and Ekaterina Zinoveva. "The effectiveness of facade systems." MATEC Web of Conferences 298 (2019): 00013. http://dx.doi.org/10.1051/matecconf/201929800013.
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The article discusses the results of studying the thermotechnical properties and energy saving factors of insulation systems based on mineral wool products and products based on extruded polystyrene foam under conditions close to natural ones. The studies were carried out on the basis of the hypothesis according to which the heat-saving characteristics of the facade insulation systems are most dependent on the thermal resistance along the surface of the wall, on the thermotechnical uniformity of the insulating sheath and on the stability of the properties of the heat-insulating materials under real operating conditions. The implemented complex made it possible to establish that the smallest difference between the air temperature in the room and the surface temperature in the lower zone was achieved on a fragment of the building envelope with a mounted facade system with XPS as insulation. For the same type of facade system, the maximum heat transfer resistance in the lower zone of the building envelope was reached - 2.72 m2 ° C / W for the cold period of the year, which significantly exceeds the characteristics of the system of mounted ventilated facades with mineral wool thermal insulation in the corresponding zones. The factor of “additional warming” from the soil, which is used to justify the rejection of warming in the buried part of the structure, does not work in the cold season. Flooding at thezone with the junction of the wall with the soil significantly affects the values and nature of the distribution of operating humidity inside the insulation layers.