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Journal articles on the topic 'Thermal Insulation'
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1
Šípková, Veronika, Sarka Korbelova, and Jiri Labudek. "Comparison Thermal Conductivity and Cost of Materials Specified for Thermal Insulation of the Building's Facade." Advanced Materials Research 1020 (October 2014): 545–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.545.
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Situation on insulation market, not only in Czech Republic, is confused for the general public. This paper tries to streamline this fact. Here are described more than 30 types of thermal insulations divided into 6 categories. Each category is detailed described by physical parameters and each is sequentially selected about 5, which are most frequently using like thermal insulation of the building's façade, without air gap. Elementary parameters, which are most important from investors view, are finances. Like a basic reference value was chosen thermal conductivity of insulation and for economical compare was chosen uniform thickness insulation on building envelope 100 mm. On the basis of these two values are insulation chosen. In this paper are results clearly graphically compiled.From graphs it is clear, that most of thermal insulation's values of thermal conductivity are very similar, bud prices of insulations can be usually substantially different. From this is evident, that some of insulation are so popular, because their producer have excellent marketing and promotion.
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Gomez, Ricardo S., Túlio R. N. Porto, Hortência L. F. Magalhães, Clotildes A. L. Guedes, Elisiane S. Lima, Dannyelle M. A. Wanderley, and Antonio G. B. Lima. "Transient Thermal Analysis in an Intermittent Ceramic Kiln with Thermal Insulation: A Theoretical Approach." Advances in Materials Science and Engineering 2020 (March 10, 2020): 1–15. http://dx.doi.org/10.1155/2020/6476723.
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Increasing the thermal efficiency of drying and firing processes of ceramic products plays an important role for industries that want to remain competitive in the market. Thus, this work aims to evaluate the influence of the type and thickness of thermal insulations, applied on the external sidewalls of an intermittent ceramic kiln, on heat transfer, temperature distribution in the insulating material, maximum external surface temperature, and energy gain, compared to the kiln without thermal insulation. All proposed mathematical formulations are based on the energy conservation, and mathematical procedures are implemented in Microsoft Excel software. Here, it was tested four types of thermal isolators: fiberglass, rockwool, calcium silicate, and ceramic fiber. Results indicate that the greater the thickness of the thermal insulation, the lower the maximum external surface temperature and the greater the energy gain when compared to the kiln without thermal insulation. In addition, fiberglass is the insulating material, among the four types analyzed, which provides greater energy gain and greater reduction in maximum external surface temperature.
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Lai, Jin Xing, Cheng Bing Gong, and Yan Song Wang. "Model Test Study on Insulator of Cold-Region Tunnel in Northeast China: A Case Study of Gaoling Tunnel." Applied Mechanics and Materials 71-78 (July 2011): 1870–74. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1870.
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Based on similarity theory, the systemic analysis for the distribution characteristics of tunnel temperature field in two different working conditions of having no thermal insulation and installing PU as insulator is progressed by using manufactured model test platform in order to realize the tunnel temperature field rule in cold regions with or without thermal insulation and the influence of thermal insulation layout pattern on insulating effect. The results show that the temperature variation conforms to the “tunnel freeze-thaw circle” theory without thermal insulation, and the surrounding rock maintains negative temperature all the time in the low temperature environment; the internal temperature field of surrounding rock plays a decisive role on the surface temperature of surrounding rock, which keeps above 0°C after the layout of thermal insulation with appropriate material and thickness.
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Andonova, A., A. Aleksandrov, K. Peichev, and R. Georgiev. "Thermography evaluation of a bioreactor’s heat loss to surrounding environment." Electronics and Communications 16, no. 3 (March 28, 2011): 181–84. http://dx.doi.org/10.20535/2312-1807.2011.16.3.266780.
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The thermal losses of a bioreactor have to be compensated for fermentation process maintaining (the temperature first of all). In order to decrease consume heat by the bioreactor and to make up thermal losses a heat insulation has been performed. In this paper a noncontact and nondestructive thermography qualification of the thermal losses and evaluation of the heat insulation’s quality for an anaerobic bioreactor is offered. By using software Researcher a thermography analysis for three different cases (without compensated heat losses; with one layer of thermal insulation; with two layers thermal insulation) is carried out. The received results show the advantages of the used approach for qualification of different kind of heat insulations
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Szucs, Aron, Zlatko Kolondzovski, Jan Westerlund, and Juha Vahala. "Diamond enriched lamination and winding insulation for electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1245–52. http://dx.doi.org/10.1108/compel-10-2018-0397.
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Purpose The thermal management of electrical insulations poses a challenge in electrical devices as electrical insulators are also thermal insulators. Diamond is the best solid electrical insulator and thermal conductor. This can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. The paper introduces these techniques and discusses its effect for the design of electrical machines and its potential consequences for electromagnetic analysis, for example, in multi-physics modelling. The diamond winding insulation is patent-pending, but the diamond enriched lamination insulation is published for the benefit of the scientific community. Design/methodology/approach The windings of electrical machines are insulated to avoid contact between the coil and other conductive components, for example, the stator core. The principle of using mica tape and resin impregnation has not changed for a century and is well established to produce main insulation on a complex conductor shape and size. These insulations have poor heat-conducting properties. Similarly, the insulation of laminated steel sheets comprising the stator and rotor restrict heat flow. Diamond-based insulation provides a new path. Increased thermal conductivity means reduced temperature rise and the reduced thermal time constants in multi-physics simulations and system analysis. Findings The largest benefit of a diamond-based core insulation is in electrical machines in which the losses are conducted axially to the coolant. These are machines with radial ducts and effective cooling in the end regions. The main benefit will be in reducing the number of radial ducts that positively affect the size, production costs and the copper losses of the machine. The increased thermal conductivity of the diamond insulation system will reduce the thermal constants noticeably. These will affect system behavior and the corresponding simulation methods. Originality/value Diamond insulation can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. It might also lead to new modeling requirements in system analysis.
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Klinklow, Nattida, Sethayuth Padungkul, Supoj Kanthong, Somjate Patcharaphun, and Ratchatee Techapiesancharoenkij. "Development of a Kraft Paper Box Lined with Thermal-Insulating Materials by Utilizing Natural Wastes." Key Engineering Materials 545 (March 2013): 82–88. http://dx.doi.org/10.4028/www.scientific.net/kem.545.82.
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This research studied the feasibility of using natural fibers extracted from natural wastes as a thermal-insulating material lined in a Kraft paper box packaging. The natural fibers were extracted from natural waste of rice straws using NaOH solutions. The extracted fibers were then formed as a porous thermal-insulating pad by a spray lay-up method using natural rubbers as binders. The thermal conductivities, specific heat capacities and temperature-rise time of the natural fiber insulation and other thermal-insulating materials including polystyrene foam, a polyethylene foam, and a glass fiber insulation were studied and compared. The glass fiber insulation showed the highest thermal conductivity, while the thermal conductivities of the other studied insulating materials were found to be similar. Moreover, the polymeric and natural-fiber insulations show better temperature-rise resistance than the glass fiber insulation. The temperature rises for different insulating materials were estimated using the analytical analysis of heat transfer. The calculated temperature-rise times were compared with the empirical results; both results are in the same order of magnitude. Consequently, a Kraft paper box lined with natural-fiber pads was constructed and compared with a Kraft paper box (without insulation lining) and a polystyrene box of equal sizes. The boxes were packed with an equal amount of ice and left under room temperature for 24 hours. The results show that, after 24 hours, the temperatures inside the natural-fiber lined box and the polystyrene box were contained below 15 °C, while the temperature inside the Kraft paper box increase to room temperature only after 16 hours. The observation shows that a natural fiber pad can potentially be used as an alternative insulating material in packaging industries, which can enhance environmental-friendly packaging products.
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Zach, J., J. Peterková, V. Novák, J. Bubeník, M. Košir, and D. Božiček. "Study of the possibility of using vacuum insulation panels in building construction in comparison with conventional insulators." Journal of Physics: Conference Series 2568, no. 1 (August 1, 2023): 012011. http://dx.doi.org/10.1088/1742-6596/2568/1/012011.
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Abstract The use of super insulating materials in the construction industry, including vacuum insulation, closely corresponds to the ever-increasing requirements for the construction of low-energy and passive buildings. Their indisputable advantage is their excellent thermal insulation properties at low thickness compared to conventional thermal insulation materials. However, there are also many risks associated with the experience and practice of the personnel involved in the application of these materials to structures. The paper focuses on the overall comparison of the possible use of vacuum insulation panels in modern building structures in terms of possible design solutions and achieved properties. The paper presents the results of selected case studies of the optimal use of vacuum insulation panels (VIP) in the construction industry, which are focused on different areas of building structures, specifically on the detail of the transition of the terrace and the adjacent floor, as well as on the solution of the filling of openings - doors. Based on the results of the studies carried out, it can be concluded that, provided that all procedures for maintaining the VIP properties are followed in the implementation of these materials in structures, vacuum insulations represent a more suitable solution for structural details in selected details (less thickness and comparable thermal insulation properties compared to conventional insulations).
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Chen, Lingqi, and Yufan Wang. "Thermal insulations under concepts of green building in China." Applied and Computational Engineering 9, no. 1 (September 25, 2023): 67–74. http://dx.doi.org/10.54254/2755-2721/9/20230044.
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In order to protect the environment in present-day society, green buildings are seen as an effective and logical solution. Insulating materials are frequently widely used in green buildings to reduce their energy dissipation. China, as a global power, is at the forefront of ecological development. This paper will focus on the study of thermal insulations in the context of green concepts, a specific analysis of their properties and examples of their application in China. It is found that most of the green developments lack economic support and therefore, insulation materials need to be developed in the direction of low cost and high efficiency and effectively reduce their harmful effects on the environment. Furthermore, the development of insulation materials in China should pay attention to geographical differences, i.e. the insulation materials that can be applied in different regions in the North and South are different. This study will facilitate the application of insulating materials in China's ecological development, reducing related energy losses and protecting the surrounding environment.
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Thie, Conal, Sean Quallen, Ahmed Ibrahim, Tao Xing, and Brian Johnson. "Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building." Gels 9, no. 2 (January 19, 2023): 86. http://dx.doi.org/10.3390/gels9020086.
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Energy consumption, specifically in the building sector, is expected to rise. One potential way to reduce energy consumption, or to slow this increase, is to reduce the heat loss in residential homes. Silica aerogels have grown in popularity as an insulating material due to their extremely low thermal conductivity. However, the benefits of using silica aerogels as an insulator in residential buildings have not been thoroughly studied. To understand the benefits of using silica aerogels as a thermal insulator in residential homes, experimentally validated simulations were performed. The simulations were performed on a model of a full-scale residential house using the multiphysics software ANSYS FLUENT 2019 R2. The simulations helped predict the actual saving benefits of using aerogels as an insulator. Aerogels have the potential to be used as an insulator in both the walls and windows due to its semitransparency. The results showed that the average kWh savings using one half-inch layer of wall aerogel insulation coupled with window aerogel insulation was 20.9% for the single-family house compared to traditional insulation. On average, the energy lost through the windows was 39.1% lower when using aerogel insulation compared to standard insulating materials. The energy lost through the house walls was 13.3% lower on average when using a thin layer of aerogel insulation. While a thin layer of aerogel insulation provided a benefit when used in the house walls, the potential for savings per quantity used was greater in the windows.
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Hroudová, Jitka, and Jiri Zach. "Development and Study of the Possibilities to Use Natural Materials for Thermal-Insulation Systems of ETICS." Advanced Materials Research 587 (November 2012): 31–35. http://dx.doi.org/10.4028/www.scientific.net/amr.587.31.
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Thermal insulation systems of ETICS are now mostly solved in the building industry, whether in terms of insulating the structures, choices of materials and subsequent recycling after the end of their life period. From the environmental point of view and also in the perspective of sustainable development, it is essential to look for other suitable material bases which relate only to easily renewable sources of raw materials or to industrial wastes which have long been available in sufficient quantity and quality. It is important that production of the insulation systems is energetically efficient modest in terms of manufacturing facilities. The aim of this paper is to verify the possibility of using natural insulation materials for thermal insulation systems ETICS. This paper describes the results of studies of key properties of insulations based on industrial hemp and flax and the results of computational simulations of the behavior of these insulations incorporated in the real systems ETICS.
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Shioura, Naoto, Kazuki Matsushima, Tomoki Osato, Tomonaga Ueno, Norifumi Isu, Takeshi Hashimoto, and Takumi Yana. "Fabrication and Characterization of Porous Silica/Carbon Nanotube Composite Insulation." MRS Advances 5, no. 33-34 (2020): 1791–98. http://dx.doi.org/10.1557/adv.2020.252.
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AbstractIn recent years, the demand for high performance thermal insulations has increased. While foam and aerogels have been researched for high performance thermal insulation, novel material design is required for further improvement. A porous silica has been found to have the potential to form a new thermal insulation material. However, porous silica is a powder and is difficult to form the porous compact. Therefore, we propose a composite insulation of powdered porous silica (p-SiO2), carbon nanotubes (CNTs) and sodium carboxy methyl cellulose (CMC). The fine voids and bulky structure of p-SiO2 greatly suppress gas and solid heat transfer. The composite of CNT can improve the moldability and enhance the mechanical properties. The moldability of thermal insulating materials improved even with the addition of 1 wt% CNT. With the addition of 1 wt% CNT, the increase in thermal conductivity was less than 0.01 W⋅m-1⋅K-1.
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Lakatos, Ákos. "Novel Thermal Insulation Materials for Buildings." Energies 15, no. 18 (September 14, 2022): 6713. http://dx.doi.org/10.3390/en15186713.
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Using thermal insulation materials to reduce energy loss in buildings is a key action. For reducing the building’s energy use, firstly, the internal unheated spaces (attics, cellars) should be insulated, followed by the insulation of the external walls, and changing the doors and windows. Finally, the building can be completed with the renovation/maintenance of its service systems. Newly designed and constructed buildings are subject to increasingly strict regulations, which highlight the minimization and elimination of wasteful energy use and the resulting emissions of harmful substances. Therefore, the use of thermal insulation is the first step in making buildings more energy efficient. In this editorial, seven articles covering thermal insulation possibilities and topics are highlighted. This paper reflected on the use of thermal insulations both for internal and external applications. This editorial also promotes the use of super insulation materials such as aerogels and vacuum insulation panels; furthermore, the possible applications of bio-based insulations are also endorsed. In this paper, the sound insulation capabilities of some materials are also emphasized, and they will be presented from the point of view of cost.
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Niu, Zhi Rong, Hou Ren Xiong, Zong Min Yu, Yi Xiang, and Yi Ying Luo. "Monitoring and Analysis on Temperature for External Foam Glass Thermal Insulating System on Walls under Weathering Test." Applied Mechanics and Materials 71-78 (July 2011): 3918–24. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3918.
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The external foam glass thermal insulating system on walls has become a new thermal insulation wall system in china's building wall, It is green energy - saving building wall product with good prospect and used for wall thermal insulation of building. In this paper, real-time monitoring with thermal sensor and analysis on temperature for external foam glass thermal insulating system on walls by weathering test in Jiaxing area, and study on temperature distribution for each layer of walls. The experiment showed that, the external foam glass thermal insulating system on walls caused by foam glass insulation layer of adiabatic effect, Interface layer and thermal insulation layer of temperature difference between change significantly, existing 50 °C, which can cause greater temperature stress, and have certain effect of durability for external foam glass thermal insulating system on walls.
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Yu, Xing, Liu Lei, Cao Chang, Fan Weidong, Yan Keju, and Cheng Zhongfu. "A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System." E3S Web of Conferences 155 (2020): 01007. http://dx.doi.org/10.1051/e3sconf/202015501007.
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Vacuum heat insulating tubing is an important wellbore heat insulating facility for heavy oil thermal recovery at present. Its heat insulating performance directly affects the thermal recovery efficiency. The research on the heat insulating system of vacuum heat insulating tubing is of great significance to improve and improve the heat insulating performance and enhance the thermal recovery of heavy oil. This paper summarizes and analyses the current research status of vacuum insulated tubing insulation system. It elaborates the insulation structure, insulation materials, annular air charging and vacuum pumping, insulation coating and so on. It provides reference and reference for the future research of vacuum insulated tubing.
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Feng, Xiao Ping, Chun Ting Li, and Jun Jie Wu. "Thermal Simulation Analysis of Insulation of the New Heat-Insulation Bricks." Applied Mechanics and Materials 584-586 (July 2014): 1536–40. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1536.
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Using the ANSYS thermal analysis module to do steady thermal analysis of given heat-insulating bricks. The results show that this kind of bricks can achieve better insulation in both sides; when the thermal conductivity of the heat insulating material in the hole space are less than 0.3 W/(m·K), the bricks can obtain the good insulation effect; the smaller the heat conductivity coefficients of the bricks materials and filling materials are, the better insulation bricks can achieve.
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Cui, Yan Qiu, Yun Long Peng, and Cai Ling Luo. "Study on the Fire Protection Technologies for External Thermal Insulation System of the Buildings." Applied Mechanics and Materials 638-640 (September 2014): 1646–49. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1646.
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EPS, XPS and PU plates etc. are often selected as the insulating layer in external thermal insulation system. Although featured by good thermal insulation properties and low costs, these materials are provided with major fire potential. Therefore, fireproof treatment methods for the thermal insulation materials and fireproof structural measure for the system are proposed in this paper based on the combustion tests on the thermal insulation materials, so as to increase the fire protection safety of the external thermal insulation system.
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M, Khoukhi. "Thermal Assessment of a New Bio - Based Insulation Material." Open Access Journal of Waste Management & Xenobiotics 2, no. 4 (2019): 1–5. http://dx.doi.org/10.23880/oajwx-16000133.
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In recent times, the building sector is moving towards new approaches to energy - efficient design "low energy consumption". The development of bio - based thermal insulation materials contributes to such approaches; their implementation in the building gives a good result in a reduction of energy demand. Moreover, another beneficial environmental portion such as the reduction in the depletion of non - renewable resources and in waste generation. Using thermal insulation in the building envelope can substantially reduce the building's thermal load and consequently its energy consumption. Thermal insulation is organic or inorganic material, manufactured to reduce the propagation of the heat by a combined heat transfer (i.e., conduction, convection, and radiation). More advanced insulation materials have been recently developed. However, most of the available insulations are not eco - friendly and may require a huge amount of energy and complex manufacturing processes to be produced. Some commercialized bio - based therm al insulation materials are currently available, such as industrial fibers hemp, flax, kenaf. Also, recently some researches are conducted to develop thermal food - crop by - product insulation from palm date, pin apple leaves and rice husk. However, productio n cost and lower thermal resistance are the main correlated issues. A new cheap bio - insulation material with huge commercialization potential and environmental footprint is proposed. The main idea of running a project is to develop a new material, which is environmentally friendly insulation from grain. The early experiments of the insulation product showed a similar or even better thermal performance that could compete with common insulation materials such as polystyrene.
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Liu, Li, Yi Yue, and Jian Xin Cao. "Study of Xonotlite Architectural Coatings for Exterior Wall Insulation Mechanism." Materials Science Forum 809-810 (December 2014): 672–75. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.672.
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Thermal insulation exterior wall coating has been successfully prepared, using styrene-acrylic emulsion as film former, and xonotlite as heat-insulating filler, which produced by hydrothermal reaction. The insulation mechanism of xonotlite is explored, through analyzing the microstructure of homemade xonotlite thermal insulation exterior wall coating. The results show that xonotlite is a kind of compound type heat-insulating filler that can effectively weakened the heat transfer in the coating, like heat conduction, thermal convection and thermal radiation.
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Jintakosol, Thanut, and Supreyak Kumfu. "Properties of Thermal Insulation from Durian Peel Fiber and Natural Rubber Latex." Advanced Materials Research 506 (April 2012): 571–74. http://dx.doi.org/10.4028/www.scientific.net/amr.506.571.
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This research presented the studies on the production and properties of thermal insulation produced from durian peel fiber and natural rubber latex. The thermal insulation were made by spray the pre-treated natural rubber latex onto durian peel fiber in the fiber : binder ratios of 1:2, 1:3 and 1:4 to form squared thermal insulation with the size of 20 cm and 1.5 cm thickness. Thermal conductivity measured in accordance with American Society for Testing Materials standard was found to be 0.026 W /m K with density of 143 kg m-3 which closed to the commercial insulator. The success of this study shown that the thermal insulation made from durian peel fiber and natural rubber latex exhibited a good thermal insulation and extremely potential to instead of the synthesis fibrous insulator.
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Shah, Sagarkumar, Vinay Bhatt, Jinesh Shah, Manojkumar Sheladiya, and Pratik Kikani. "Study of Thermal Insulating Materials And Costing of Economic Thickness of Insulation." Indian Journal of Applied Research 3, no. 8 (October 1, 2011): 77–80. http://dx.doi.org/10.15373/2249555x/aug2013/79.
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Yakovchuk, R., A. Kuzyk, O. Miller, and A. Lyn. "HEAT INSULATION-APPARATUS SYSTEMS OF HOUSEHOLD FACADE AS A FACTOR OF INCREASED FIRE HAZARD." Fire Safety, no. 32 (August 14, 2018): 80–89. http://dx.doi.org/10.32447/20786662.32.2018.12.
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The paper analyzes the problems associated with the fire hazard of the application of thermal insulation and finishing systems of facades of buildings, which directly depends on the design solution of the thermal insulation system and the type of thermal insulation material.
The generalized requirements for physical and technical indicators of the quality of heat-insulating materials; the possibility of applying facade heat insulation structures depending on their class, the height of the houses and the combustibility of the materials of the heat-insulating and finishing layers; fire-technical characteristics of expanded polystyrene are considered. The threats of fire spreading by thermal insulation systems of facades are analyzed and possible ways of its propagation between floors are considered.
It is concluded that the use of combustible thermal insulating materials poses an increased danger to life and health of people during a fire. The problem of ensuring the fire safety of buildings, in which the insulation and finishing systems of exterior walls are used, depends on a number of factors and requires a more thorough study.
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Zach, Jiri, Rudolf Hela, Jitka Peterková, and Martin Sedlmajer. "Utilization of Lightweight Aggregate from Expanded Obsidian for Advanced Thermal Insulating Plasters Production." Advanced Materials Research 335-336 (September 2011): 1199–203. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1199.
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The thermal insulating of new and existing buildings is of a key influence in reduction of their energetic demand factor resulting in reduction of emissions of gases, carbon particles and dust which directly improves the environment. At development of light thermal insulation plasters with very low thermal conductivity the foam-plastic matters or light porous aggregates are frequently used at present. The foam-plastic materials do not appear as convenient ones in view of the environment and sustainable development as well. In the given case the thermal insulation plasters based on light cellular aggregates appear as more suitable. However a majority of light aggregates (for example expanded perlite) do not show a good ratio of insulation and mechanical properties. The paper describes a design and development of thermal insulation plasters based on expanded obsidian that can be used for thermal insulating of building constructions and for moisture sanitation. Considering the applied type of aggregates the materials show better ratio of thermal insulation and mechanical properties while in practice the plasters can be used as a full- value alternative for classical thermal insulation systems.
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Latif, Eshrar. "Experimental Analysis of Moisture-Dependent Thermal Conductivity, and Hygric Properties of Novel Hemp–shive Insulations with Numerical Assessment of Their In-Built Hygrothermal and Energy Performance." Materials 17, no. 2 (January 19, 2024): 486. http://dx.doi.org/10.3390/ma17020486.
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The use of lime as a binder in hemp–lime considerably increases the drying time of hemp–lime after casting. Furthermore, lime is a non-renewable mineral resource. As such, this paper explores the effectiveness of using an alternative non-mineral binder instead of lime to formulate a novel hemp–shive insulation. The moisture-dependent thermal conductivity, adsorption isotherm, vapour diffusion resistance factor, and in-built hygrothermal performance of four variants of a novel bio-based insulation were investigated. The hygrothermal performance of the novel hemp–shive insulation was compared with that of a previously developed novel hemp–lime insulation. No significant variation in thermal conductivity of hemp–shive insulations between the equilibrium moisture contents (EMC) at 0% and 50% relative humidity (RH) was observed, but there was a substantial increase in thermal conductivity hemp–shive insulations when the material reached the EMC at 98% RH. The average dry thermal conductivity values of hemp–shive and hemp–lime insulations were also similar. The adsorption isotherms of hemp–shive insulations were determined at 0%, 20%, 50%, 70%, 90%, and 98% relative humidity steps. At 98% RH, the moisture adsorption capacity of hemp–shive insulations was 4-to-5-times higher than that of hemp–lime insulation. Hemp–shive insulations’ vapour diffusion resistance factor (µ value) was about double the µ value of hemp–lime insulation. Hemp–shive insulations exhibited 4-to-5-times higher water absorption resistance than that of hemp–lime insulation. Numerically determined porosity values of hemp–shive agree with the values of wood-based insulation materials of similar density. Finally, using all experimentally acquired data as inputs, dynamic whole-building hygrothermal simulations were carried out and the results show that novel hemp–shive insulation materials perform at a similar level to the hemp–lime insulation in terms of heating and cooling energy demand but require 45% less energy for humidification. However, the relative humidity inside the hemp–shive wall remains higher than 70%, which can potentially induce mould growth.
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Novák, Vítězslav, Jiri Zach, and Martina Reif. "Using Waste PUR Granules as an Alternative to Integrated Thermal Insulation in Ceramic Blocks." Key Engineering Materials 714 (September 2016): 128–33. http://dx.doi.org/10.4028/www.scientific.net/kem.714.128.
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The paper deals with the use of waste granular PUR, which currently does not have a wide application in the building practice. Waste granular PUR is formed during the manufacture and moulding of thermal insulation elements made of PUR foam. Good thermal insulation properties can be expected in this waste granular PUR, approaching those of the commonly used thermal insulation today (mineral wool, polystyrene). The paper deals with a thermal insulating mixture of granular PUR with a silicate binder. This newly designed thermal insulation mixture was tested as an alternative integrated thermal insulation in ceramic masonry blocks.
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Sepehr, K., and L. E. Goodrich. "Frost protection of buried PVC water mains in western Canada." Canadian Geotechnical Journal 31, no. 4 (August 1, 1994): 491–501. http://dx.doi.org/10.1139/t94-058.
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Although desirable for many reasons, controlled low-strength material – controlled density fill (nonshrinkable fill) has the potential to promote rapid frost penetration within the trench when used as a backfill material in waterworks construction and repair projects. This paper describes results of a two-dimensional finite-element heat-transfer model study carried out to investigate the effectiveness of various insulation systems for frost and frost-heave protection of buried waterlines. Combinations of nonshrinkable fill with horizontal insulation boards, cylindrical pipe insulation, and inverted U-shaped insulations were investigated. It was shown that, while moderate thicknesses of insulation could be found to protect the pipe from freezing, thermal-bridging effects make the location of the maximum frost penetration depth sensitive to details of the insulation geometry. The use of different combinations of insulating backfills was also investigated, and it was shown that a backfill layer of moderate insulating value placed high in the trench may be most advantageous. Key words : frost, frost protection, insulation, waterlines, nonshrinkable fill, numerical analysis.
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Ribeiro, Eduardo Silveira, Ronan Adler Tavella, Guilherme Senna dos Santos, Felipe da Silva Figueira, and Jorge Alberto Vieira Costa. "Thermal and acoustic insulation boards from microalgae biomass, poly-β-hydroxybutyrate and glass wool." Research, Society and Development 9, no. 4 (March 21, 2020): e143942995. http://dx.doi.org/10.33448/rsd-v9i4.2995.
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Among the many functions that a building material needs to have, its insulation functions stand out. This type of materials acts by decreasing the conduction of heat/sound in to the environment. In this context, bio-insulations have been receiving an increasing attention due to its performance and the use of sustainable/naturals insulation materials. This study was conducted to evaluate the thermal and acoustic performance of bio-based boards made from the biomass of Spirulina, bacterial poly-β-hydroxybutyrate (PHB), and glass wool. The boards were manufactured under heated compression in different proportions: 33.33% glass wool, 33.33% PHB, and 33.33% Spirulina biomass (Board A); 20% glass wool, 40% PHB, and 40% Spirulina (Board B); 40% glass wool, 40% PHB, and 20% Spirulina (Board C); and 40% glass wool, 20% PHB, and 40% Spirulina (Board D). Boards A and B showed lower thermal conductivity (0.09 W m-1 K-1) compared to traditional insulating materials, such as gypsum neat (0.44 W m-1 K-1) and Kaolin insulating firebrick (0.08–0.19 W m-1 K-1). Board D showed the highest sound absorption coefficient of ~1600 Hz compared to other bio-based insulators at the same frequency, such as polypropylene based non-woven fiber and tea-leaf-fiber with the same thickness. For the noise reduction coefficient, board B showed better results than concrete. Thus, boards A and B are suitable as thermal insulators, while boards B and D are suitable as sound insulators. For simultaneous application as a thermal and sound insulator, board B is the best choice among all boards.
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Hutkai, K., and D. Katunský. "Insulation of historic buildings and case study simulation." IOP Conference Series: Materials Science and Engineering 1209, no. 1 (December 1, 2021): 012003. http://dx.doi.org/10.1088/1757-899x/1209/1/012003.
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Abstract The article deals with the historic buildings and their insulation. It is generally known that classical thermal insulation of walls from the outside is not permissible due to the cultural value of historic facades. Compared to external insulation solutions, the implementation of internal insulation is more technically complex and faces several risks. In the article is devoted the chapter which deals with the aim of the application of internal insulation in historic buildings. There are mentioned risks associated with the application of internal insulation, which are related to the thermal-humidity behaviour of the structure. One chapter is devoted to faults that may occur after the application of internal insulation. These disorders have a building-physical character and also affect the hygienic criteria of the building. The larger chapter deals with insulating materials suitable for the purposes of interior insulation of historic buildings. The results of a case study from Dublin and Košice are also presented, where the thermal-humidity behaviour of selected thermal insulation materials was investigated. The results of moisture content and surface temperature before and after application of insulating materials are compared.
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Sedlmajer, Martin, Jiri Zach, and Jitka Hroudova. "Possibilities of Development of Thermal Insulating Materials Based on Waste Textile Fibers." Advanced Materials Research 1124 (September 2015): 183–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1124.183.
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The paper describes the possibility of using textile fibers (natural and synthetic) for the production of thermal insulation materials in the form of mats using in construction. The paper deals mainly with soft thermal insulation mats and the factors that affect the thermal insulation properties of the insulating material in its manufacture and subsequent incorporation into the structure.
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Krashchenko, Vladislav, Nikita Tretyakov, Alexander Chernov, Ilmir Shaykhalov, and Alexey Zhukov. "Modeling and thermal calculation of a pipeline insulation system." E3S Web of Conferences 164 (2020): 14021. http://dx.doi.org/10.1051/e3sconf/202016414021.
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Energy efficiency of heating networks depends on the costs of the manufacture of insulation materials and components, its installation and exploitation of insulating jacket. As insulation materials for insulation of heating networks, products based on rock wool, polyurethane foam extruded polystyrene foam, foam rubber and polyethylene foam. In this contribution introduced basic principles of calculating the thickness of the thermal insulation of a pipeline by the value of the standard density of the heat flow are given using an example of the use of products based on polyethylene foam. Calculation of the heat flux from the surface of the heat-insulating structure is carried out at a given thickness of the heat-insulating layer if there is a need to determine heat loss (or cold loss). The basis for the calculation is a mathematical model of heat transfer, a developed calculation algorithm and a computer program. The method of installation of thermal insulation depends on the diameter of the pipeline and the selected type of product. Insulating cylinders or cylinders in combination with heat-insulating mats are used for pipelines of small diameters. Roll materials are used to isolate large diameters. Products are fixed on pipelines using mechanical fasteners.
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Li, Ke Jie, Zhu Li, Xiu Hua Guo, and Yuan Zhen Liu. "The Application of Thermal Insulation Glazed Hollow Bead Concrete in Tunnel Cooling Structure." Applied Mechanics and Materials 226-228 (November 2012): 1699–703. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1699.
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With the mining depth increasing, the effect of temperature on coal mine is outstanding with each passing day. In order to enhance the tunnel insulating layer heat insulation effect, thermal insulation glazed hollow bead concrete will be used in tunnel wall thermal insulation layer, the characteristics of thermal insulation glazed hollow bead concrete will be discussed and the appropriate mixture ratio and coefficient of heat conductivity will also be determined, as well as in the basis of reasonable theoretical analysis and derivation, prediction of the thermal insulation material of surrounding rock after exhaust heat will drop significantly, and it is proved that the thermal insulation glazed hollow bead concrete used in deep mine roadway can produce the benefit and have broad prospects.
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Zach, Jiri, Jitka Peterková, Vít Petranek, Jana Kosíková, and Azra Korjenic. "Investigation of Thermal Insulation Materials Based on Easy Renewable Row Materials from Agriculture." Advanced Materials Research 335-336 (September 2011): 1412–17. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1412.
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Production of building materials is mostly energy consuming. In the sphere of insulation materials we mostly see rock wool based materials or foam-plastic materials whose production process is demanding from material aspect and raw materials aspect as well. At present the demand for thermal insulation materials has been growing globally. The thermal insulation materials form integral part of all constructions in civil engineering. The materials mainly fulfill the thermal insulating functions and also the sound-insulating one. The majority of thermal insulation materials are able to fulfill both of the functions simultaneously. The paper describes questions of thermal insulation materials development with good sound properties based on natural fibres that represent a quickly renewable source of raw materials coming from agriculture. The main advantage of the materials are mainly the local availability and simple renewability of the raw materials. In addition an easy recycling of the materials after their service life end in the building construction and last but not least also the connection of human friendly properties of organic materials with advanced product manufacture qualities of modern insulation materials.
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Teh, Khar San, David W. Yarbrough, Chin Haw Lim, and Elias Salleh. "Field evaluation of reflective insulation in south east Asia." Open Engineering 7, no. 1 (December 29, 2017): 352–62. http://dx.doi.org/10.1515/eng-2017-0039.
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AbstractThe objective of this research was to obtain thermal performance data for reflective insulations in a South East Asia environment. Thermal resistance data (RSI, m2 ⋅ K/W) for reflective insulations are well established from 1-D steady-state tests, but thermal data for reflective insulation in structures like those found in South East Asia are scarce. Data for reflective insulations in South East Asia will add to the worldwide database for this type of energy-conserving material. RSI were obtained from heat flux and temperature data of three identical structures in the same location. One unit did not have insulation above the ceiling, while the second and third units were insulated with reflective insulation with emittance less than 0.05. RSI for the uninsulated test unit varied from 0.37 to 0.40 m2 ⋅ K/W. RSI for a single-sheet reflective insulation (woven foil) varied from 2.15 to 2.26 m2 ⋅ K/W, while bubble-foil insulation varied from 2.69 to 3.09 m2 ⋅ K/W. The range of RSI values resulted from differences in the spacing between the reflective insulation and the roof. In addition, the reflective insulation below the roof lowered attic temperatures by as much as 9.7° C. Reductions in ceiling heat flux of 80 to 90% relative to the uninsulated structure, due to the reflective insulation, were observed.
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Hayrullin, A. R., A. I. Haibullina, and A. M. Gusyachkin. "Thermal Conductivity of Insulation Material: Effect of Moisture Content and Wet-Drying Cycle." Materials Science Forum 1085 (April 20, 2023): 119–24. http://dx.doi.org/10.4028/p-c1g33d.
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The insulation materials are widely used in petrochemical, power engineering and other industries. The thermal insulation materials play an important role in the energy saving of district heating systems and in the building sector. In this work, the thermal conductivity of rock wool with different levels of moisture content and density of the insulation material was investigated by an experimental method. Experimental studies were carried out on rock wool from three different manufacturers. The effect of the wetting and drying cycle on thermal conductivity and density of the insulating material is analyzed. The thermal conductivity of the insulating material was measured using the guarded hot plate method. It was found that the thermal conductivity of insulating materials significantly affected the moisture content. The increase in thermal conductivity was from 1.33 to 4.42 times, depending on the density and the manufacturer of the rock wool. The wetting and drying cycles increase the thermal conductivity and density of the insulating material up to 2 and 2.5 times, respectively.
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Zeng, Ling, Yan Shao, Hui Zuo, and Jia Hua Li. "Research on Heat Transfer Properties and Insulation Mechanism of FHP-Vc Inorganic Composite Silicate Insulation Board." Advanced Materials Research 550-553 (July 2012): 2791–96. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2791.
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The paper introduced the basic performance and thermal insulation mechanism of a new building thermal insulation material—FHP-Vc inorganic composite silicate heat-insulating board which is used as the thermal insulation material for exterior wall. Based on the experiments and analysis of the heat transfer performance of FHP-Vc board, it has been found that the thermal performance of FHP-Vc board meets the current design standard of building energy efficiency. At the same time, it is a new building energy-saving material which has good insulation, non-burning, reliable and economical properties.
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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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Veeraprabahar, J., G. Mohankumar, S. Senthil Kumar, and S. Sakthivel. "Development of natural coir/jute fibers hybrid composite materials for automotive thermal insulation applications." Journal of Engineered Fibers and Fabrics 17 (January 2022): 155892502211363. http://dx.doi.org/10.1177/15589250221136379.
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Thermal comfort property is closely related to the concept of thermal insulation and includes protection against heat. This research paper presents an experimental study on thermal insulation properties, for natural fiber composite materials: a natural fiber (Coir/Jute) with different blend proportions of raw materials mixed with rigid polyurethane foam as a binder. The natural fiber composite materials were characterized by both thermal resistance (Thermal Insulation Value TIV) and also in terms of heat transfer (thermal conductivity). Thermal insulation values were measured according to Lee’s disk method (ASTM C177). The influence of the structure of these materials on the thermal insulating properties was analyzed. The experimental results show the thermal resistance performances of natural fiber composites based on coir/jute fiber materials, thus promoting environmentally friendly solutions.
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Raza, Mohsin, Hyder Al Abdallah, Ayah Abdullah, and Basim Abu-Jdayil. "Date Palm Surface Fibers for Green Thermal Insulation." Buildings 12, no. 6 (June 20, 2022): 866. http://dx.doi.org/10.3390/buildings12060866.
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Some of the major challenges of the twenty-first century include the continued increase in energy consumption and environmental pollution. One approach to overcoming these challenges is to increase the use of waste materials and environmentally friendly manufacturing methods. The high energy consumption in the building sector contributes significantly to global climatic changes. Here, by using date palm surface fibers, a high-performance green insulation material was developed via a simple technique that did not rely on any toxic ingredients. Polyvinyl alcohol (PVA) was used as a binding agent. Four insulation samples were made, each with a different density within the range of 203 to 254 kg/m3. Thermal conductivity and thermal diffusivity values for these four green insulators were 0.038–0.051 W/m·K and 0.137–0.147 mm2/s, respectively. Thermal transmittance (U-value) of the four insulation composites was between 3.8–5.1 W/m2·K, which was in good comparison to other insulators of similar thickness. Thermogravimetric analysis (TGA) showed that insulating sample have excellent thermal stability, with an initial degradation temperature of 282 °C, at which just 6% of its original weight is lost. Activation energy (Ea) analysis revealed the fire-retardancy and weakened combustion characteristics for the prepared insulation composite. According to differential scanning calorimetry (DSC) measurements, the insulating sample has a melting point of 225 °C, which is extremely close to the melting point of the binder. The fiber-based insulating material’s composition was confirmed by using Fourier transform infrared spectroscopy (FTIR). The ultimate tensile range of the insulation material is 6.9–10 MPa, being a reasonable range. Our study’s findings suggest that developing insulation materials from date palm waste is a promising technique for developing green and low-cost alternatives to petroleum-based high-cost and toxic insulating materials. These insulation composites can be installed in building envelopes during construction.
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Kalánek, Jiří, Libor Šteffek, and Milan Ostrý. "Compare of Experimental and Numerical Evaluation of Structure with Application of Reflective Insulation." Applied Mechanics and Materials 824 (January 2016): 34–41. http://dx.doi.org/10.4028/www.scientific.net/amm.824.34.
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Thermal insulation effect of reflective insulation is based on the reflection of thermal radiation. Reflective insulations are mainly used in combination with the non-ventilated air cavity. Proposed paper deals with experimental measurements of the thermal insulation properties of the air cavity surrounded by low-emissivity surfaces and comparison of measured values with calculated values according to the standardized procedures. The beginning for determination of the thermal resistance of air cavity was to conduct several experimental measurements by Hot Box method using heat flow meter. The results show good agreement between measured and calculated data.
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He, Zhi Min, Jun Zhe Liu, and Tian Hong Wang. "Influence of Air Entraining Agent on Performance of Inorganic Thermal Insulating Mortar." Applied Mechanics and Materials 71-78 (July 2011): 490–93. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.490.
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This paper presents a laboratory study on the effect of air entraining agent on the performance of thermal insulating mortar with glazed hollow bead. The test results show that with the dosage of air entraining agent increases, the consistency of thermal insulating mortar increases, apparent density, thermal conductivity and drying shrinkage decline, However, the compressive strength greater losses owing to excessive consumption of air entraining agent; air entraining agent within a certain dosage can significantly improve the operating performance of thermal insulation mortar, increase its consistency and reduce its apparent density, thermal conductivity coefficient and drying shrinkage. Due to excessive addition of air entraining agent, the apparent density, thermal conductivity and compressive strength of thermal insulation mortar all increase. For a specific insulation mortar, there will exist the best mixing amount of air entraining agent.
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Balasubramanian, K. R., S. P. Sivapirakasham, and Jiss Mathew. "Analysis of Chemical Degradative Effects on Low Voltage PVC Insulation Using DSC." Applied Mechanics and Materials 592-594 (July 2014): 2475–80. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2475.
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PVC insulation has extensively been used for insulating low voltage electrical cables. They offer superior insulating properties but how ageing and exposure could affect their insulation properties is a matter of concern. Chemical exposure related failure modes are known but have received only limited study. The traditional testing methods like insulation testing could only test whether the present properties are satisfactory. The application of thermal analysis methods like differential scanning calorimetry could identify the variation in thermal characteristics with respect to ageing and chemical exposure. Polluted environments may cause a direct attack upon a polymer. It has been concluded that significant changes in the behavior of insulation occurs in acidic environment that may lead to insulation failures.
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Zhu, Yan, Jian Ge, and Dan Hua Ying. "Research of Appropriateness of Residence Outer Wall Thermal Insulating System in New Rural Construction in Zhejiang." Advanced Materials Research 461 (February 2012): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.461.237.
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Buildings have consumed around 1/4-1/3 of the country’s energy consumptions, of which the envelope structures, especially the outer walls, takes the largest percentage. The pilot program for external thermal insulation in new rural construction has commenced along with full implementation of outer wall energy saving and thermal insulation in Hot Summer and Cold Winter Zone. The program has proved the thermal insulating technology which is characterized by broad applicability, strong operability, reliable thermal insulating performance and low comprehensive cost, is a set of thermal insulating technology compatible with the level of rural economic and technical development in China.
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Song, Jinbao, Lishuang Wang, Jiantao Yao, and Hui Dong. "Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review." Coatings 13, no. 2 (February 2, 2023): 343. http://dx.doi.org/10.3390/coatings13020343.
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Thermal barrier coatings (TBCs) are a fundamental technology used in high-temperature applications to protect superalloy substrate components. However, extreme high-temperature environments present many challenges for TBCs, such as the degradation of their thermal and mechanical properties. Hence, highly insulating, long-life TBCs must be developed to meet higher industrial efficiency. This paper reviews the main factors influencing the thermal insulation performance of TBCs, such as material, coating thickness, and structure. The heat transfer mechanism of the coating is summarized, and the degradation mechanism of the thermal insulation is analyzed from the perspective of the coating structure. Finally, the recent advances in improving the thermal insulation and lifetime of coatings are reviewed in terms of advanced materials and structural design, which will benefit advanced TBCs in future engineering applications and provide guidance for the next generation of high thermal insulating TBCs.
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Skrzetuska, Ewa, Michał Agier, and Izabella Krucińska. "Study of Influence of Atmospheric Conditions on the Thermal Properties of Sleeping Bags." Materials 15, no. 6 (March 8, 2022): 1992. http://dx.doi.org/10.3390/ma15061992.
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The thermal properties of clothing products are influenced by external environmental parameters, such as temperature, humidity, air flow and parameters related to the user’s body, which mainly include temperature and humidity. Depending on the type of raw material, its thickness and the material manufacturing technique, clothing products are characterised by certain insulating properties to protect the human body from external factors. A multilayer system made of different material groups can change the thermal insulating capacity significantly, which cannot be determined by the testing of individual layers used in the production. In order to determine the influence of weather conditions on thermal insulation and air permeability, tests were carried out for two types of sleeping bags (summer and autumn) produced by the same manufacturer, differing in insulation thickness. Simulations were carried out using SolidWorks and verified using a Newton thermal mannequin. During tests, both the temperature (range from −20 °C to 20 °C) and humidity values were changed (range 40–80% humidity). For sleeping bags, the effective thermal insulation decreases along with the increase of temperature and decrease of humidity. It can be observed, for the autumn sleeping bags, that for a temperature of 20 °C and humidity of 60%, the thermal insulation is 1.063 m2·K·W−1, while for a temperature of −20 °C and humidity of 60% thermal insulation increases significantly and amounts to 1.111 m2·K·W−1. A similar situation occurs for the effective thermal insulation of a summer sleeping bag (20 °C/60% thermal insulation is 0.794 m2·K·W−1, while for −20 °C/60%—0.851 m2·K·W−1. During the tests, the humidity and temperature between the layers of the clothing system were also controlled, in order to learn more about the influence of these parameters on the thermal insulation properties of the sleeping bags.
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Baek, Lee, and Kim. "Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load." Applied Sciences 9, no. 20 (October 9, 2019): 4207. http://dx.doi.org/10.3390/app9204207.
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In electric vehicles (EVs), the use of high-temperature heat transfer components that effectively block external heat and minimize cooling losses can increase vehicle mileage during heating/cooling operations and improve passenger comfort. In particular, in ensuring high thermal insulation, the car headliner forms an important component for effectively managing environmental heat energy and heating and cooling processes inside the EV. In this study, we have proposed and experimentally verified the use and efficacy of vacuum insulation material in the headliner of EVs to reduce the heat load. The thermal conductivity and air permeability of various conventional insulating and vacuum insulation materials used for the headliner were compared to accurately predict the vacuum insulation material performance. We found that the vacuum insulation material affords reduced surface roughness and thermal conductivity and high formability relative to conventional insulation. We also confirmed consequent improvements in the insulation performance by comparing the characteristics of the proposed vacuum-insulation-material headliner (relative to conventional materials) via prototyping and reliability testing. With the “improved” headliner, in summer, the temperature of the automobile cabin was lowered by 2.8 °C, and the cabin temperature was lowered by 3.9 °C during the cooling period relative to conventional insulators, which proves that the cabin temperature can be maintained at a low value during summer parking or cooling. In winter, the cabin temperature was found to be 7.7 °C higher than that obtained with the conventional insulator, which indicates that the cabin temperature can be maintained higher via reduction in the heat loss (because of using vacuum insulation) under the same heating energy conditions during winter.
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Petrov, G. I., V. N. Kornienko, and A. G. Donetskikh. "Ensuring energy efficiency of refrigeration piping." Lizing (Leasing), no. 4 (October 1, 2021): 45–52. http://dx.doi.org/10.33920/vne-03-2110-07.
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Improving energy efficiency and energy saving in refrigeration technology depends largely on the use of modern thermal insulation materials in the thermal insulation structures of refrigeration pipelines. The article presents a comparative analysis of the thermal characteristics and operational properties of heat-insulating materials used in refrigeration. The features of RUFLEX thermal insulation materials based on foamed synthetic rubber produced from domestic raw materials and their compliance with the requirements of energy efficiency, durability, operational reliability and safety are considered.
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He, Zhiqiang, Heping Xie, Mingzhong Gao, Ling Chen, Bo Yu, Yunqi Hu, and Jianping Yang. "Design and Verification of a Deep Rock Corer with Retaining the In Situ Temperature." Advances in Civil Engineering 2020 (September 15, 2020): 1–13. http://dx.doi.org/10.1155/2020/8894286.
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Deep rock is always under high-temperature conditions. However, traditional coring methods generally have no thermal insulation design, which introduces large deviations in the guidance required for resource mining. Thus, a thermal insulation design that utilizes active and passive thermal insulation was proposed for deep rock corers. The rationale behind the active thermal insulation scheme was to maintain the in situ core temperature through electric heating that was controlled by using a proportional-integral-derivative (PID) chip. Graphene heating material could be used as a heating material for active thermal insulation through testing. In regard to the passive thermal insulation scheme, we conducted insulation and microscopic and insulation effectiveness tests for hollow glass microsphere (HGM) composites and SiO2 aerogels. Results showed that the #1 HGM composite (C1) had an excellent thermal insulation performance (3 mm thick C1 can insulate to 82.6°C), high reflectivity (90.02%), and wide applicability. Therefore, C1 could be used as a passive insulation material in deep rock corers. Moreover, a heat transfer model that considered multiple heat dissipation surfaces was established, which can provide theoretical guidance for engineering applications. Finally, a verification test of the integrated active and passive thermal insulation system (graphene heating material and C1) was carried out. Results showed that the insulating effect could be increased by 13.3%; thus, the feasibility of the integrated thermal insulation system was verified. The abovementioned design scheme and test results provide research basis and guidance for the development of thermally insulated deep rock coring equipment.
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Kim, Yu Min, Yong Jun Lee, Gyeong Seok Choi, and Jae Sik Kang. "Thermal Performance of Sandwich Insulation System According to the Type of Form-Tie." Advanced Materials Research 689 (May 2013): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.689.269.
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Highly insulated envelope or external insulation systems are being applied in recent energy saving buildings to reduce the heat loss through envelope. Internal insulation systems are applied to most apartments in Korea because they are inexpensive and convenient to construct. However, the internal insulation systems have poor performance due to the heat bridges through structures such as slabs. The external insulation systems have better thermal performance because the heat bridges through the structure are rarely formed. But it has problems regarding the external insulator separation due to strong winds, spread of fire due to insulator combustion in case of fire, formation of heat bridges through the connectors between structure and external insulation. To supplement the weaknesses of the internal and the external insulation systems, a sandwich insulation system has been suggested. In this study, the thermal performance of sandwich insulation system for apartment buildings was evaluated according to two type of the form-tie material.
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Zhang, Xiaojing, Lu Ren, Haichuan Yu, Yang Xu, Qingquan Lei, Xin Li, and Baojia Han. "Dual-Temperature Evaluation of a High-Temperature Insulation System for Liquid-Immersed Transformer." Energies 11, no. 8 (July 27, 2018): 1957. http://dx.doi.org/10.3390/en11081957.
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A high-temperature oil–paper insulation system offers an opportunity to improve the overloading capability of distribution transformers facing seasonal load variation. A high-temperature electrical insulation system (EIS) was chosen due to thermal calculation based on a typical loading curve on the China Southern Power Grid. In order to evaluate candidate high-temperature insulation systems, Nomex® T910 (aramid-enhanced cellulose) immersed in FR3 (natural ester) was investigated by a dual-temperature thermal aging test compared with a conventional insulation system, Kraft paper impregnated with mineral oil. Throughout the thermal aging test, mechanical, chemical, and dielectric parameters of both paper and insulating oil were investigated in each aging cycle. The thermal aging results determined that the thermal class of the FR3-T910 insulation system meets the request of overloading transformer needs.
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Grosso, Cristiane Fernanda, and Irene Rodrigues Freitas. "The Importance of Thermal Insulation: Characteristics, Properties and Applications." International Journal of Emerging Research in Management and Technology 6, no. 10 (October 20, 2017): 29. http://dx.doi.org/10.23956/ijermt.v6i10.64.
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Thermal insulation is used to ensure that there is no loss or gain of heat in a medium, and therefore must be very well chosen considering the properties, applications and costs. It is used for protection, prevention, comfort and economy. The choice of insulation, the thickness and the method of application are extremely important to obtain good technical and economic results. The objective of the present article was to compile characteristics and properties of thermal insulation, exposing its applications in thermal products companies. Thus, information and research results were collected from articles, and grouped into insulation originating from animal, synthetic, vegetal, animal, vacuum compounds and gases. A questionnaire was also applied to manufacturers and users of thermal insulation, reporting on each insulation and its applications. The differences of each thermal insulation, its advantages and applications are noted. There is no insulator that fully has all the advantageous properties and characteristics. Therefore, the choice of the insulation should be thorough, opting for one which shows greater propensity to the desired application.
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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.