Journal articles on the topic 'Insulation (Heat) Thermal properties'
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1
Abdullaev, Azim Rasulovich, Xayotbek Mansurjon O’g’li Rafiqov, and Isroiljonova Nizomjon Qizi Zulxumor. "A Review On: Analysis Of The Properties Of Thermal Insulation Materials." American Journal of Interdisciplinary Innovations and Research 03, no. 05 (May 7, 2021): 27–38. http://dx.doi.org/10.37547/tajiir/volume03issue05-06.
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Clothing insulation is one of the important factors of human thermal comfort assessment. Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radioactive influence. Thermal insulation can be achieved with specially engineered methods or processes, as well as with suitable object shapes and materials. Heat flow is an inevitable consequence of contact between objects of different temperature. Thermal insulation provides a region of insulation in which thermal conduction is reduced or thermal radiation is reflected rather than absorbed by the lower-temperature body. The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. Heat energy can be transferred by conduction, convection, radiation or when undergoing a phase change. For the purposes of this discussion only the first three mechanisms need to be considered. The flow of heat can be delayed by addressing one or more of these mechanisms and is dependent on the physical properties of the material employed to do this. Predicting the pattern of clothing adjustment to climate change can provide important basis for thermal comfort and energy consumption analysis. To achieve reliable results, it is necessary to provide precise inputs, such as clothing thermal parameters. These values are usually presented in a standing body position and scarcely reported locally for individual body parts. Moreover, as an air gap distribution is both highly affected by a given body position and critical for clothing insulation, this needs to be taken into account.
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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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Apkaryan, A. S., and S. N. Kulkov. "Thermophysical properties of glass-ceramic material during thermal insulation of pipelines of heating mains and utilities." Perspektivnye Materialy 11 (2020): 45–51. http://dx.doi.org/10.30791/1028-978x-2020-11-45-51.
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It is proposed to use porous heat-insulating glass-ceramic material (SCM) in the form of segments based on glass, plasticizer, organic additives and a gas generator for thermal insulation of pipelines of heating mains and utilities. Research on the use of SCM in pipelines was carried out according to the key methodology for studying new materials: composition, structure, properties, their changes under the influence of external factors, application. The basis for determining the effectiveness of thermal insulation materials for thermal insulation of pipes was on the physical and technical characteristics of the coolant, pipes and thermal insulation materials. During the study, heat losses and thermal resistances through the insulated surface of the supply and return pipelines of heat networks were determined when installed on the surface. When calculating the heat loss through the pipe using various heat insulators, the layer thickness was assumed to be the same value. Studies have shown that when using a shell made of granular SCM, the heat loss transmitted by thermal conductivity is 1.36 times less than that of a vermiculite shell, 2.45 times than that of mineral wool segments and 2.11 times than that of brand 500 sovelite shells. The use of products made of granular glass-ceramic material (SCM) significantly reduces heat loss and the thickness of the heat-insulating layer of pipelines, and saves fuel and energy resources.
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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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Crnoja, Andelko, Vladimir Kersh, Oleg Popov, and Alina Dovhulia. "Laboratory Studies of the Heat-Insulating Properties of the Panels that Made of Recycled Rubber." Key Engineering Materials 864 (September 2020): 66–72. http://dx.doi.org/10.4028/www.scientific.net/kem.864.66.
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This study examines the thermal insulation properties of panels made from recycled rubber. The reasons, in addition to the use in construction, are environmental protection, sustainable development, energy conservation. The thermal conductivity coefficient λ is the main characteristic, on the basis of which a decision is made on the choice of material as a heat insulator. Materials with λ <0.2 W / (m · K) are heat-insulating. Tested 3 composition of the material of different particle size distribution. It is shown that the key parameters that determine the heat-shielding properties of a material are its density and particle size distribution. It has been confirmed that with decreasing density the insulating properties of materials are improved. Compositions consisting of small grains have the best heat-insulating properties. After samples with grains of small size, in order of deterioration, samples of grains of large size and, finally, samples of mixed particle size distribution follow. The results also showed that the amount of binder in this case is negligible (4.2-7.5%) and practically does not affect the insulating properties of the material. Abstract: This study discusses the thermal insulation properties of panels made from recycled rubber. The reasons, in addition to the use in construction, are environmental protection, sustainable development, energy conservation. The thermal conductivity coefficient λ is the main characteristic, on the basis of which a decision is made on the choice of material as a heat insulator. Materials with λ <0.2 W / (m · K) are heat-insulating. Tested 3 composition of the material of different particle size distribution. It is shown that the key parameters that determine the heat-shielding properties of a material are its density and particle size distribution. It has been confirmed that with decreasing density the insulating properties of materials are improved. Compositions consisting of small grains have the best heat-insulating properties. After samples with grains of small size, in order of deterioration, samples of grains of large size and, finally, samples of mixed particle size distribution follow. The results also showed that the amount of binder in this case is negligible (4.2-7.5%) and practically does not affect the insulating properties of the material.
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Zhao, Shan, Feng Lan Li, Su Yang, and Li Sha Song. "Thermal Insulation Behaviors of Rinforced Concrete Composite Wall with Inner Insulating Layer." Advanced Materials Research 152-153 (October 2010): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.395.
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The new reinforced concrete composite wall (RCCW) with inner insulating layer of polystyrene panel was developed to improve the durability of external thermal insulation plate on walls. The composite structure and construction method of the RCCW is briefly introduced in this paper. The thermal insulation behaviors such as conduct heat coefficient and total heat resistance of RCCW are tested by the protection chest method, the measured and calculated results of thermal insulation properties of the RCCW are compared with each other, the effect of heat-bridge resulted from connected concrete supports of specimen and bottom side concrete of specimen covering inner insulating layer on the test results is discussed.
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Petrosyan, Artashes Levoni. "The Influence of the Properties of Thermal - Insulation Materials on the Thermomoist Indicators of a Building." Key Engineering Materials 906 (January 11, 2022): 125–33. http://dx.doi.org/10.4028/www.scientific.net/kem.906.125.
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One of the basic measures of energy efficiency in residential buildings is the reduction of heat and coolant pressure, when external structures - walls, ceilings - contain thermal insulation material, as a result of which heat and cold losses are reduced, as a result of air-and moisture permeability. Their number is largely determined by the climatic zone of the building, construction, sources of heat and cold, fuel and electricity prices in this region. In such practice, first of all, attention is paid to the problems of the optimal thickness of the thermal insulator, the installation location, since improper installation in the structure can cause water condensation, which will lead to partial wear of the structure, since the properties of reinforced-concrete layers will deteriorate. This concerns the peculiarities of carrying out thermal insulation works and their necessity both in under construction and in buildings in use. However, even in these conditions, when discussing the thermal effect of thermal insulation on structures, due attention is not paid to individual structures, especially walls, moisture problems. Consideration of insulators with more or less efficient energy and heat engineering characteristics, when it was found that there is a significant difference between their results and effects, aroused particular interest in the study of the problem. This is followed by a study of the influence of the presence of thermal insulation in the structure on the cold load required for cooling, revealed a pattern of cost changes in the case of insulating materials with more or less properties - foam.
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Bruyako, Mihail Gerasimovich, Larisa Grigorieva, and Evgeniya Viktorovna Sokoreva. "Influence of Reactive Organic Flame Retardants on Properties of Resol Phenoplast Foams." Advanced Materials Research 1025-1026 (September 2014): 451–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.451.
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Found that Organophosphorus Compounds Reduce the Flammability of Resol Phenoplast Foams. Quality Improves Thermal Insulation Materials, the Use of such Phenolicfoam. Analysis of Using the Heat-Insulating Materialsindicates that Heat Insulation Made with Filling Phenol Foam Plastics Havinglow Heat-Conductivity and Relatively Low Cost of Raw Materials is Superior Bytheir Technical and Economic Performance to Mineral and other Polymericheat-Insulating Materials. Meanwhile, Relatively Low Strength and Smolderingpropensity of Resole Foam Phenol Plastics, as well as Excessive Fumes Duringthe Production Process of Heat-Insulating Materials on their Base, Containwider Usage of Phenol Foam Plastics in Building.
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Zhukov, Alexey, Armen Ter-Zakaryan, Ekaterina Bobrova, Igor Bessonov, Andrey Medvedev, Vitaly Mukhametzyanov, and Alexey Poserenin. "Evaluation of thermal properties of insulation systems in pitched roofs." E3S Web of Conferences 91 (2019): 02047. http://dx.doi.org/10.1051/e3sconf/20199102047.
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The article outlines the basic requirements for pitched roof insulation systems. The analysis of the properties of thermal insulation materials used in insulation systems was conducted. It is substantiated that the thermal resistance of such structures on the surface of the roof is formed taking into account the thermal conductivity of thermal insulation, thermal conductivity of wooden rafters and heat loss through the leakiness of joints and mounting devices. An assessment was made of the effect of loads of various types on the heat-insulating layer, namely: the effect of the air flow in the ventilated gap; the movement of the vapor-air mixture in the material; condensation of water vapor and penetration of drip liquid; exfiltration of air at the joints of the plates and on the surfaces of contact with the supporting structures. The expediency of using products on the basis of unstitched polyethylene foam in the construction of pitched roofs with a wooden roof system, taking into account the advantages and features of this material, as well as taking into account the possibility of creating a seamless insulating shell, is substantiated.
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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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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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Zhao, Shun Bo, Su Yang, Li Sha Song, Li Sun, and Chen Xiao Song. "Experimental Study on Thermal Insulation Properties of Reinforced Concrete Composite Wall." Applied Mechanics and Materials 99-100 (September 2011): 676–79. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.676.
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The paper briefly introduces the form and construction method of a new reinforced concrete composite wall (RCCW) with inner insulating layer of polystyrene panel. The thermal insulation properties such as heat resistance, heat exchange resistance and heat transfer coefficient of the RCCW were measured by the protection chest method, six specimens in dimensions of 1450mm×1450mm×300mm were cast with the same thickness of prototype walls of building envelop, three kinds of linkages of the RCCW were considered, and two surfaces of the specimen were tested respectively as the heat bearing surface to simulated different heat resources. Based on the tests, the effects of linkages and heat resources on thermal insulation properties of the RCCW are analyzed, some improvements are proposed for reducing the heat-bridge effects as much as possible.
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Bazukova, E. R., Yu V. Vankov, S. O. Gaponenko, and N. N. Smirnov. "Study of thermal conductivity coefficient of basalt fiber insulation at various temperature conditions." Vestnik IGEU, no. 4 (August 31, 2021): 15–24. http://dx.doi.org/10.17588/2072-2672.2021.4.015-024.
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Industrial thermal insulation fibrous materials (mineral wool and fiberglass products) are mainly used for thermal protection of the systems transporting high-temperature heat carriers. The data known in the scientific literature about the effect of insulation density and operating temperature conditions on the thermophysical properties of materials made of basalt fiber differ significantly. Taking these data into account let us improve the accuracy of thermal calculations and the validity of design solutions for thermal protection of industrial networks up to 60 %. The aim of the study is to obtain data on the change of the heat-shielding properties of insulating materials made of basalt fiber of various densities, depending on the temperature conditions of operation. An experimental study of the thermophysical properties of several samples of basalt fiber insulation has been carried out on a laboratory bench. The density of a constant heat flux passing through the sample has been determined by the additional wall method. The experimental unit consists of a cylindrical metal tube with a built-in electric heater, on the top of which a heat-insulating basalt fiber of various densities is placed. The temperature on the pipe surface is changed in the range from 50 to 350 оC. The dependence of the thermal conductivity coefficient of thermal insulation basalt fiber samples on its density and operating temperature of the material is obtained. The research results show that thermal conductivity coefficient of basalt fiber insulation increases with temperature increase of the pipeline surface. The lower the value of the material density is, the higher the increment of the thermal conductivity coefficient is. The obtained results enrich the data about the dependence of the thermal conductivity of fibrous heat-insulating materials on density and temperature (for cases of operation at high temperatures). Considering the density of the examined materials made of basalt fiber when determining the thermal conductivity makes it possible to increase the accuracy of calculations up to 20 % and temperature modes of operation up to 60 %. The results obtained can be applied to find the thickness of the thermal insulation of pipelines and heat losses in the networks.
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Keprdová, Šárka, and Jiří Bydžovský. "The External Thermal Insulation Material Made of Technical Hemp." Advanced Materials Research 897 (February 2014): 315–18. http://dx.doi.org/10.4028/www.scientific.net/amr.897.315.
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The paper discusses the possibilities of production of external thermal insulation material from technical hemp bonded mixture of cement, hydraulic lime and secondary raw materials. To verify the applicability of this material as a heat-insulating, it was necessary to test its properties. The basic characteristics are to be determined bulk weight and heat conductivity factor. Additionally was also tested the tensile strength in bending and compressive strength. Based on the measured properties was decided to evaluate the applicability of this material as an additional thermal insulation.
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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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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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Kušnerová, Milena, Marta Harničárová, Jan Valíček, Zuzana Palková, Zdenko Tkáč, Anton Panda, Ján Kmec, and Ondrej Lukáč. "Measurement of the Thermal Properties of Innovative Highly-Insulating Non-Structural Concretes." Defect and Diffusion Forum 390 (January 2019): 41–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.390.41.
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Thermal characteristic of insulation concretes is one of the key components in materials selection especially in civil constructions. In this article, non–tabulated material parameters of some innovative highly-insulating non-structural concretes are presented. The specific volumetric heat capacity, specific heat capacity, parameter of temperature diffusivity and thermal mass parameter of the innovative highly-insulating cementitious composites were determined. The experiments were conducted using a prototype automated calorimetric chamber. The measurement results are compared with those obtained by using a commercial multifunctional instrument (Isomet 2114) and are accompanied by the measurement of other significant thermal parameters of the cementitious composites under investigation. The results indicated that there is potential of using the newly created types of concrete for insulation purposes.
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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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Yousefi, Y., and F. Tariku. "Thermal Conductivity and Specific Heat Capacity of Insulation materials at Different Mean Temperatures." Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012090. http://dx.doi.org/10.1088/1742-6596/2069/1/012090.
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Abstract Thermal conductivity and heat capacity are among the most essential properties of a building insulation in calculating thermal performance which are subjected to change when exposed to temperatures variation in service. Ignoring the temperature dependency of these material properties can result in under and over estimations of buildings energy uses and the corresponding equipment sizing. To obtain more realistic conductivity values of insulation materials, in this paper, thermal conductivity tests are conducted at various mean temperatures. For the study six commonly used insulations including Cellulose fiber, Expanded Polystyrene, Extruded Polystyrene, Open Cell Spray Polyurethane, Polyisocyanurate, and Mineral Wool are considered, and their thermal conductivity are measured at seven mean temperatures ranging from 5°C to 60°C. Furthermore, their specific heat capacity are measured at nine mean temperatures ranging between 16°C and 36°C. The results showed that except Polyisocyanurate board, the thermal conductivities and specific heat capacities of all insulation materials increased linearly with rising temperature, presenting a linear regression model with correlation coefficients (R2) values between 0.96 and 0.98. The curve fitting of the Polyisocyanurate thermal conductivity measurements resulted a nonlinear regression model with R2 of 0.97. The thermal conductivity of six insulations as a function of temperature have been established.
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Zach, Jiří, Jitka Peterková, and Jan Bubeník. "Study of behaviour of thermal insulation materials under extremely low pressure." MATEC Web of Conferences 282 (2019): 02044. http://dx.doi.org/10.1051/matecconf/201928202044.
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In most thermal insulation materials, reduced internal pressure improves thermal insulation properties. It reduces heat transport by convection as well as heat conduction in gases in the material´s pore structure. The dependence of thermal conductivity on pressure is individual to every type of insulation with open porosity. In general, a material with fine porosity is not very sensitive to pressure change within the range of very low pressure to vacuum. On the other hand, materials with a larger number of bigger pores are more sensitive to changing pressure. Any pressure change between atmosphere pressure and vacuum causes a change in thermal conductivity. The paper presents the results of an investigation into the behaviour of alternative fibrous insulations usable in the production of vacuum insulation panels at low pressure.
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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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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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Prasanth, R., M. Muralidharan, A. Arun, S. Ravi Shankar, S. Vinoth, and Y. Vinod Kumar. "Analysis of Energy Loss through Conventional Refractory Lining in Refinery Heater and its Conservation Measures." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 118. http://dx.doi.org/10.14419/ijet.v7i3.34.18786.
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The work of this project is to analyze theinsulation materials currently used in the furnace of CPCL refinery which is a crude distillation unit heater to minimize the heat loss through the radiant wall section by substituting them with advanced insulating materials.There are some advanced materials whose properties are well suited for the insulation purpose in the furnace wall which could apparently reduce the heat loss through the walls. The general properties which include weight, thickness, thermal conductivity, are calculated to prove that these materials can be used as a replacement to those of the regular insulation materials.The materials which have been taken for analysis can reduce heat loss and improve thermal efficiency it will not require much maintenance activities compared to the old insulation and installing the new insulation is much easier than old as it can be handled easily.This paper will prove that replaced materials will act as an effective insulation than old type.
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Pokorný, Jaroslav, Milena Pavlíková, Jaromír Žumár, Anton Trník, and Zbyšek Pavlík. "Heat and Water Vapor Transport Properties of Sandwich Composite with Aerogel Insulation." Advanced Materials Research 1126 (October 2015): 143–47. http://dx.doi.org/10.4028/www.scientific.net/amr.1126.143.
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Several thermal insulation systems were developed for improvement of thermal performance of buildings. Exterior thermal insulation systems represent usually natural solution of the problem of low thermal resistance of building envelopes. However, in some cases, there is necessary to realize interior thermal insulation systems, what brings number of possible problems. Their common disadvantage is a limitation of interior space due to the thickness of thermal insulation layer and a possible condensation of water vapor which permeates the thermal insulation system. On this account, new sandwich composite with silica aerogel originally designed for application in interior thermal insulation systems is studied in the paper. Thermal properties are measured by two transient methods using devices ISOMET 2114 and RTB. The water vapor transport parameters are determined on the basis of dry cup and wet cup methods. The obtained data gives information on thermal and water vapor transport properties of the particular layers of sandwich composite and predetermines its behavior at real climatic exposure of building.
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Glombikova, Viera, Petra Komarkova, Eva Hercikova, and Antonin Havelka. "How High-Loft Textile Thermal Insulation Properties Depend on Compressibility." Autex Research Journal 20, no. 3 (September 18, 2020): 338–43. http://dx.doi.org/10.2478/aut-2019-0015.
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AbstractThis paper investigates the performance of high-loft thermal insulations in terms of their compression properties, recovery behavior and thermal resistance. The aforementioned properties belong to the basic producer requirements for winter functional sportswear, sleeping bags or blankets. Majority of thermal insulation producers declare high quality of their products claiming durability and insulation within beginning of their application. But, it is important to uncover how dynamic compressive loading (which simulates real condition of using) influences heat transport of tested filling for the whole lifetime period. Therefore, two groups of top synthetic thermal insulation materials were tested before and after compression loading. Subsequently, relaxation behavior of samples was determined by thickness recovery after the compression test. Furthermore, thermal resistance was measured before and after the compression test to find out the change in thermal effectivity of samples. In summary, these results have not met expectations and show a rather poor correlation between the rate of compression after dynamic loading and the drop of thermal resistance of tested fillings.
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Gunnarshaug, Amalie, Maria-Monika Metallinou, and Torgrim Log. "Industrial Thermal Insulation Properties above Sintering Temperatures." Materials 14, no. 16 (August 21, 2021): 4721. http://dx.doi.org/10.3390/ma14164721.
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Processing highly flammable products, the oil and gas (O&G) industry can experience major explosions and fires, which may expose pressurized equipment to high thermal loads. In 2020, oil fires occurred at two Norwegian O&G processing plants. To reduce the escalation risk, passive fire protection may serve as a consequence-reducing barrier. For heat or cold conservation, equipment and piping often require thermal insulation, which may offer some fire protection. In the present study, a representative thermal insulation (certified up to 700 °C) was examined with respect to dimensional changes and thermal transport properties after heat treatment to temperatures in the range of 700 °C to 1200 °C. Post heat treatment, the thermal conductivity of each test specimen was recorded at ambient temperature and up to 700 °C, which was the upper limit for the applied measurement method. Based on thermal transport theory for porous and/or amorphous materials, the thermal conductivity at the heat treatment temperature above 700 °C was estimated by extrapolation. The dimensional changes due to, e.g., sintering, were also analyzed. Empirical equations describing the thermal conductivity, the dimensional changes and possible crack formation were developed. It should be noted that the thermal insulation degradation, especially at temperatures approaching 1200 °C, is massive. Thus, future numerical modeling may be difficult above 1150 °C, due to abrupt changes in properties as well as crack development and crack tortuosity. However, if the thermal insulation is protected by a thin layer of more robust material, e.g., passive fire protection to keep the thermal insulation at temperatures below 1100 °C, future modeling seems promising.
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Ma, Xin Wei, and Xue Ying Li. "Preparative Techniques and its Performance of Chemically Foamed Cement Paste." Advanced Materials Research 690-693 (May 2013): 700–703. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.700.
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The foamed cement paste (FCP) is a kind of inorganic insulation material. It is characterized by its light weight, heat-insulating and fire-proofing properties, and the thermal conductivity is close to that of expanded polystyrene (EPS). The foamed cement paste is achieved by means of chemical reaction. The mixture proportion, the preparation process, mechanical and thermal properties are investigated in this paper. The results show that properly mixed paste foams stably, and the bulk density could be controlled. The hardened FCP could be used as insulating filler material in composite walls, as well as blocks for Thermal insulation walls.
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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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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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Brodzik, Lukasz, and Andrzej Frackowiak. "Determination of distribution of heat-conducting material concentration in protective layer of thermal protection system panel." Thermal Science 23, Suppl. 4 (2019): 1025–34. http://dx.doi.org/10.2298/tsci19s4025b.
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Paper presents the problem of heating the damaged insulation of an orbiter. Changes of the insulation?s thermal properties, made by adding conductive material of high value of specific heat in a form of a dope to the protective layer, were examined. An iterative algorithm determining a variable of dope concentration in the material was developed. Insulating material LI900 was used for calculations. Determination of distribution of conductive material concentration was made for materials which, after verification, demonstrated the most beneficial effect on protective properties of the modified insulation layer. Change of properties was to enable time extension of the LI900 insulation tile heating up to the maximal temperature and, additionally, to lowering this temperature.
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Kalánek, Jiří, Libor Šteffek, and Milan Ostrý. "Calculation and Experimental Evaluation of the Thermal Resistance of a Structure with Reflective Insulation." Advanced Materials Research 899 (February 2014): 374–80. http://dx.doi.org/10.4028/www.scientific.net/amr.899.374.
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As reason of increasing requirements of thermal insulation properties of the exposed envelope, reflective insulation are among kind of modern thermal insulation materials ones, which can significantly increased thermal insulation performance if their application is correct. Thermal insulation performance is caused by reduction of the heat transfer by radiation. Conjunction of low-emissivity surface of the reflective insulation and air layer is important to account. This article is focused on the determination of thermal properties of reflective insulation and the results of measured values thermal resistance of determination by hot box method using heat flow meter are presented here. As part of determination of thermal properties of reflective insulation by experimental methods, the test element used to measure the thermal resistance of an insulated air cavity had to be created for concordance with the normative requirements. The part of this article is determination of the thermal resistance by the calculation of derived physical relations and comparison with values of the laboratory measurement.
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Seneta, A. A., and N. K. Manakova. "Thermal insulating materials on liquid glass binder." Transaction Kola Science Centre 12, no. 2-2021 (December 13, 2021): 226–33. http://dx.doi.org/10.37614/2307-5252.2021.2.5.046.
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The article discusses the possibility of creating new inorganic heat-insulating materials based on liquid glass binder and mineral fillers. Within the framework of the article, the influence of various additives such as sawdust, chalk, coal and graphite on the physical and technical properties of an inorganic heat-insulating material is considered. The authors of the article proposed the compositions and conditions for obtaining materials that meet the regulatory requirements for materials and products for building thermal insulation
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Zuev, A. V., Yu P. Zarichnyak, D. Ya Barinov, and L. L. Krasnov. "MEASUREMENT OF THERMOPHYSICAL PROPERTIES OF FLEXIBLE THERMAL INSULATION." Aviation Materials and Technologies, no. 1 (2021): 119–26. http://dx.doi.org/10.18577/2713-0193-2021-0-1-119-126.
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The paper presents the results of measuring thermal conductivity and heat capacity of a flexible thermal insulation. Flexible thermal insulation is a highly porous fibrous material, a construction that includes felt, covered on all sides with fabric. The whole structure is stitched with a thread. The fibrous core, fabric and sewing thread are composed of silica fibers. Thermal conductivity was measured by the stationary method on flat samples. The heat capacity was determined using a NT-1000 calorimeter. The calculation of heat transfer was carried out for the conditions characteristic of those in effect when the spacecraft entered the orbit.
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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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Shahedan, Noor Fifinatasha, Mohd Mustafa Al Bakri Abdullah, Norsuria Mahmed, Andri Kusbiantoro, Kamarudin Hussin, Andrei Victor Sandu, and Amir Naveed. "Thermal Insulation Properties of Insulated Concrete." Revista de Chimie 70, no. 8 (September 15, 2019): 3027–31. http://dx.doi.org/10.37358/rc.19.8.7480.
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In building development, concrete is world most reliable, durable and versatile in construction materials. However, the heating and cooling system of the building is influenced by outside temperature due to extreme weather or areas condition leads to the consumption of a lot of electrical power. Thermally insulated concretes represent alternative construction materials to improve the thermal efficiency in building development. Various construction materials have different thermal insulation properties and thus, their suitability for various conditions vary. Thermal insulation properties are generally identified through specific heat, thermal conductivity, thermal diffusivity, thermal expansion, and mass loss. This paper present review the thermal insulation properties of variations insulated concrete are presently in growing demand of researchers to comfort and resolve prescribed issues related to insulated concrete in enhancing thermal insulation properties as a passive energy saving building.
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Xi, Yong Guang, Tong Jiang Peng, Hai Feng Liu, and Ji Ming Chen. "Preparation and Properties of Expanded Vermiculite/Gypsum Thermal Insulation Boards." Advanced Materials Research 178 (December 2010): 220–25. http://dx.doi.org/10.4028/www.scientific.net/amr.178.220.
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In this paper, thermal insulation boards comprising expanded vermiculite and gypsum were manufactured by casting and compression molding methods respectively. The effects of flake size and preparation methods of expanded vermiculite (EV), ratio of calcined gypsum/EV and molding methods on thermal and mechanical properties were discussed. The results indicated that the thermal conductivity (λ) and compressive strength of the boards decreased with the increase of flake size, and increased as the ratio of calcined gypsum/EV rose, and the density of the boards increased linearly with the increasing ratio. Compared to compression molding, casting technique can make insulating materials with higher thermal conductivity, compressive strength, and lower water content. The boards containing EV expanded by microwave chemical method presented a better thermal insulating property (λ=0.091W•m-1•K-1) relative to the ones filled with microwave exfoliated EV (λ=0.107W•m-1•K-1). The prepared materials can be used for heat, acoustical insulation and moisture adjustment.
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Hou, Chuanbin, Song Xin, Long Zhang, Shangxiao Liu, and Xiao Zhang. "Foundation Research on Physicochemical Properties of Mine Insulation Materials." Coatings 10, no. 4 (April 5, 2020): 355. http://dx.doi.org/10.3390/coatings10040355.
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The known cooling methods for the high-temperature operating environment of a mine mainly include ventilation, refrigeration, heat insulation, and individual protection. Among them, the superior performance and wide application of the heat insulation materials have attracted the attention of the coal mining industry. In this paper, three types of mineral insulation materials were prepared using basalt fiber, glass fiber, vitrified microbeads in combination with cement, sand, high-strength ceramsite, water, etc. In addition, the thermal conductivity and compressive strength of the prepared specimens were assessed. The results show that the test specimen containing basalt fiber had a great thermal insulation effect and achieved the required compressive strength. Furthermore, according to the COMSOL simulation results, the test specimen containing basalt fiber had a better thermal insulation effect than the ordinary concrete materials. Therefore, the research results of this article have guiding significance to search for new mine thermal insulation materials.
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Fu, Jun Ping, Zhi Hui Liang, Yu Fang Tian, Jia Ci Li, and Yan Qiu Feng. "Study on Induction-Ventilation-Based Insulation Properties." Applied Mechanics and Materials 204-208 (October 2012): 4368–71. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4368.
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When exterior wall adopts solar chimney thermal channel, natural ventilation comes into being in the thermal channel, which plays the role of reducing the heat indoor. In this article, we use FLUENT to explore the heat transfer and flow quality of the solar chimney thermal channel in Changsha area in the summer. The research mainly studies how different thermal channel widths, inlet and outlet vent heighst and solar radiation intensities can impact on ventilation effect and further concludes the rules of thermal channel flow field and ventilation rate changing of the solar chimney.
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Wang, Fei, Jin Sheng Liang, Qing Guo Tang, Na Wang, and Li Wei Li. "Preparation and Properties of Thermal Insulation Latex Paint for Exterior Wall Based on Defibred Sepiolite and Hollow Glass Microspheres." Advanced Materials Research 58 (October 2008): 103–8. http://dx.doi.org/10.4028/www.scientific.net/amr.58.103.
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Thermal insulating latex paint for exterior wall was prepared by water as dispersing media, polyacrylic emulsion as basic material, defibered sepiolite and hollow glass microspheres as main functional additives. The thermal insulation effect and mechanism were studied by thermal insulation effect testing device and visible light reflectance tester. The results show that the optimum contents of functional additives are as follows: 8% defibred sepiolite fibers, 6% hollow glass microspheres. The coating could arrest heat transmission and reflect visible light effectively.
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Gao, Jin, Taiyang Zhu, Zhi Zhang, Yuan Kong, and Xin Zhang. "Research on Interface Modification and Thermal Insulation/Anticorrosive Properties of Vacuum Ceramic Bead Coating." Coatings 12, no. 3 (February 24, 2022): 304. http://dx.doi.org/10.3390/coatings12030304.
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The thermal insulation effect of the coating was closely related to the content of the thermal insulation filler, but too much filler would cause interfacial compatibility problems of various substances in the coating, micro-defects in the coating, and affect the anti–corrosion performance of the coating. Therefore, solving the interface problem was the key to preparing a coating with heat insulation and anticorrosion functions. In this study, organic–inorganic hybrid polymer was used to modify the surface of vacuum ceramic microbeads, and epoxy–silicone resin was used as the film–forming material to prepare a heat-insulating and anticorrosive coating that can withstand 200 °C. The SEM morphology showed that the interface compatibility of the vacuum ceramic beads modified by the organic–inorganic hybrid agent and the film-forming material were improved, the dispersibility was significantly improved, and the beads were tightly arranged; the thermal conductivity of the coating reached 0.1587 W/(m·K), which decreased by 50% after adding 20% ceramic beads, ANSYS finite element simulation showed that the coating has good thermal insulation performance; after the coating underwent a thermal aging test at 200 °C for 600 h, the microstructure was dense, and the low-frequency impedance modulus was still around 109 Ω·cm2. There was no obvious defect in the microstructure after the alternating cold and heat test for 600 h; the low-frequency impedance modulus was still above 108 Ω·cm2, and the low-frequency impedance modulus of the coating was 1010 Ω·cm2 after the 130d immersion test, indicating that the coating had good heat resistance and anti-corrosion performance.
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Alassaad, Farjallah, Karim Touati, Daniel Levacher, and Nassim Sebaibi. "Thermal behavior of light earth used for building insulation: Insight on PCM introduction impact." Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012120. http://dx.doi.org/10.1088/1742-6596/2069/1/012120.
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Abstract To reduce building significant contribution to greenhouse gas emissions, architects and engineers are seeking eco-friendly construction solutions. Among investigated options, building’s thermal insulation and heat storage can be cited. In this regard, earth-based materials are attracting particular interest. These last years, there is a renewed interest in these eco-friendly building materials and techniques. This is due to many advantages that they present: excellent humidity regulation ability and high thermal inertia. Present study aims to improve light earth thermal properties. Specifically, this research work focuses on the development of an insulating and heat storing material. To achieve this, phase change materials (PCM) are incorporated in soil-natural fiber mixtures. In fact, different light earth samples are first prepared. Then, thermally characterized to highlight the impact of PCM on the light earth thermal insulating, heat storing properties and thermal response to changing boundary conditions. The incorporation of PCM showed an interesting improvement of the light earth thermal properties namely on thermal conductivity, specific heat capacity, and thermal comfort time.
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Peterková, Jitka, Jiri Zach, Martin Sedlmajer, and Ester Helanová. "Effect of Used Binders in Lightweight Plaster Mixtures on their Thermal Insulation Properties." Materials Science Forum 865 (August 2016): 32–36. http://dx.doi.org/10.4028/www.scientific.net/msf.865.32.
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Good thermal insulation properties of the surface structures lead to reduction of heat losses in buildings. This reduces the energy required for heating which is positive fact from the view protection of the environment. The aim of the research intent, which is going at Faculty of Civil Engineering in Brno, is the development of high-quality, thermal insulating plasters using both conventional binders, and alternative binders, whose acquisition-production is in comparison with the technology production of cement less energy intensive. Due to the fact that increasing moisture leads to deterioration of the thermal insulating properties, further research works were devoted to the study of the influence of relative humidity and moisture content on the thermal insulation properties of lightweight plasters, including of the determination of capillary absorption coefficient. This paper describes evaluation of the development of insulating plasters based on lightweight aggregates, using different ratio of cement and lime hydrate and other chemical additives. There are presented results of the study of basic physical and thermal insulating properties, including the study of sorption properties developed lightweight plaster mixtures.
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Makaveckas, Tomas, and Raimondas Bliūdžius. "The influence of polyisocyanurate (PIR) facing on the heat transfer through the corners of insulated building partitions." E3S Web of Conferences 172 (2020): 08008. http://dx.doi.org/10.1051/e3sconf/202017208008.
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Prefabricated products made of polyisocyanurate (PIR) thermal insulation material covered with cardboard, plastic, aluminium or composite facings are used for thermal insulation of building envelopes. The facing of these products is selected according to their conditions of use, and the effect of the facing on the declared thermal properties of the product depend only on water vapor diffuse properties of the facing. However, at the corners of the building where these products are joined, facings can be in the direction of the heat flux movement and significantly increase heat transfer through the longitudinal thermal bridge formed in the corner of the building. After analysing the solutions for installation of PIR thermal insulation products on the walls and roof corners of buildings, calculations of the heat transfer coefficients of the linear thermal bridges were made, and the influence of various facings and different structural solutions on the heat transfer coefficient value of the thermal bridge was determined. Aluminium foil facing have the greatest influence, but other facings must also be considered. The structural solutions with the greatest increase in the heat transfer due to the effect of the facing were selected, and the influence to the thermal and air tightness properties of the structural solution when facing is removed were analysed, the stability of thermal properties of the thermal insulation material were analysed as well. Proposals for joining PIR thermal insulation products with heat-conductive facings in the corners of buildings were prepared.
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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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Kraynov, Dmitriy, and Galina Medvedeva. "Research of thermal performance properties of the wall construction products made of materials using heat power engineering waste." E3S Web of Conferences 274 (2021): 07001. http://dx.doi.org/10.1051/e3sconf/202127407001.
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A technology for the utilization of technogenic waste from the oil and gas industrial complex (sulfur) and ash and slag waste from the combined heat and power plant for the manufacture of thermal insulation material with high strength and performance properties has been developed. A technological scheme is proposed. The optimal parameters and composition of the obtained thermal insulation materials have been determined. A numerical method for determining the thermal conductivity coefficient of a building product based on the calculation of a stationary temperature field is considered. The dependence of the thermal conductivity coefficient of a block on the value of the thermal conductivity coefficients of the base material and filler is obtained. The efficiency of block insulation has been determined. This method can be used at the design stage of wall products, varying their overall dimensions, the geometry of the slots and also using various thermal insulating materials as a void filler.
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EVON, Philippe, Justine Vinet, Matthieu Rigal, Laurent Labonne, Virginie Vandenbossche, and Luc Rigal. "New insulation fiberboards from sunflower cake with improved thermal and mechanical properties." Journal of Agricultural Studies 3, no. 2 (June 30, 2015): 194. http://dx.doi.org/10.5296/jas.v3i2.7738.
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New thermal insulation fiberboards were manufactured by compression molding from a cake generated during the sunflower biorefinery. Fiberboards were cohesive mixtures of a natural binder and lignocellulosic fibers from sunflower cake. The natural binder ensured the board cohesion, and fibers acted as reinforcing fillers. The influence of molding conditions, i.e. binder type and binder content, on board density, mechanical and heat insulation properties was examined. The medium-density board containing 20% starch-based binder was a good compromise between mechanical and heat insulation properties (78 mW/m K thermal conductivity). It could be positioned on walls and ceilings for thermal insulation of buildings.
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Aranberri, Ibon, Sarah Montes, Ewa Wesołowska, Alaitz Rekondo, Krystyna Wrześniewska-Tosik, and Hans-Jürgen Grande. "Improved Thermal Insulating Properties of Renewable Polyol Based Polyurethane Foams Reinforced with Chicken Feathers." Polymers 11, no. 12 (December 3, 2019): 2002. http://dx.doi.org/10.3390/polym11122002.
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In the present work, sustainable rigid polyurethane foams (RPUF) reinforced with chicken feathers (CF) were prepared and characterized. The bio-based polyol used to formulate the foams was obtained from castor oil. This investigation reports the influence of the chicken feathers fibers as reinforcement of RPUF, on water absorption, thermal, mechanical and morphological properties (field-emission scanning electron microscope—FESEM) and thermal conductivity on water-blown biofoams. It was found that the biofoams improved thermal insulating properties when CF was added. The addition of CF to foams provided lower heat flux density to the biofoams obtaining bio-based materials with better insulation properties. The results obtained in this study proved that the incorporation of CF to RPUF modified the cell structure of the foams affecting their physical and mechanical properties, as well as functional properties such as the heat transmission factor. These biofoams containing up to 45% of bio-based materials have shown the potential to replace fully petroleum-based foams in thermal insulation applications.
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Huang, Zhi Xiang, Xiang Yu Zhang, Xiao Yun Liu, and Qi Xin Zhuang. "Preparing of the Nano ATO Heat-Insulation Glass Coating." Advanced Materials Research 391-392 (December 2011): 859–63. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.859.
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In this paper, a kind of nano ATO heat-insulation glass coating was prepared by using silicone emulsion and nano tin dioxide (ATO) powder with ethanol as solvent. The properties of glass coating, such as transmittance, as well as thermal and mechanical properties, and the optimization of the ATO level were discussed. The results showed that this glass coating had good transmittance of visible light and good heat-insulation performance. The transmittance of visible light was above 75% and the highest temperature difference between the heat insulating and ordinary glass is 17°C. It had good energy-saving effect and could be widely used as architecture glass and automobile glass coating.
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Sri, Wuryanti, Suhardjo Poertadji, Bambang Soegijono, and Nasution Henry. "Experimental Investigation on the Thermal Insulation Properties of Eic-Cellulose." Applied Mechanics and Materials 554 (June 2014): 322–26. http://dx.doi.org/10.4028/www.scientific.net/amm.554.322.
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The material with low thermal conductivity means it has a high insulating capability for reducing heat transfer. One of materials for insulation is cellulose. This study presents a insulation material of cellulose made from reeds imperata cylindrical type with the extraction process. The extraction of cellulose fibers to form a sheet by adding 3.5% Na-CMC (Sodium Cellulose Carboksil Metyl). The process of forming the sheet uses blender for 30 minutes, 45 minutes, and 60 minutes. Furthermore, each mixture are put into the oven with temperature of 40°C for 36 hours. There are three parameters will be investigated, i.e. thermal conductivity, density and thermal capacity. The results showed that the lowest and the highest of thermal conductivities were 0.22 W/m K and a maximum 0.36 W/m K, respectively.
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Yao, Wei, Zhengyong Huang, Jian Li, Liya Wu, and Chenmeng Xiang. "Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids." Journal of Nanomaterials 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/4504208.
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Nanoparticles enhance the electrical insulation and thermal properties of vegetable oil, and such improvements are desirable for its application as an alternative to traditional insulating oil for power transformers. However, the traditional method of insulating nanofluids typically achieves high electrical insulation but low thermal conductivity. This work reports an environmentally friendly vegetable oil using exfoliated hexagonal boron nitride (h-BN) showing high thermal conductivity and high electrical insulation. Stable nanofluids were prepared by liquid exfoliation of h-BN in isopropyl alcohol. With 0.1 vol.% of the nano-oil, the AC breakdown voltage increased by 18% at 25°C and 15% at 90°C. Both the positive and negative lightning impulse breakdown voltages of the nano-oil were also enhanced compared with those of the pure oil. Moreover, the thermal conductivity of the nano-oil increased by 11.9% at 25°C and 14% at 90°C. Given its high thermal conductivity, the nano-oil exhibited faster heating and cooling effects than the pure oil. Nano-oils with an electric field (either DC or AC) displayed a faster thermal response than that without an electric field. The reason is that h-BN is oriented under the electric field and formed a thermal network to increase the heat transfer.