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Journal articles on the topic 'Insulation model'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

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 r

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2

Sepehr, K., and L. E. Goodrich. "Frost protection of buried PVC water mains in western Canada." Canadian Geotechnical Journal 31, no. 4 (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 inv

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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 (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 simulat

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Yamamoto, Osamu. "EXPERIENCES IN NUMERICAL ANALYSES OF SURFACE CHARGE ON INSULATORS EXPOSED TO HIGH VOLTAGE IN VACUUM." ASEAN Engineering Journal 5, no. 1 (2015): 9–21. http://dx.doi.org/10.11113/aej.v5.15452.

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This paper deals with the electrical insulation of a gap bridged by a solid dielectric between a pair of electrodes in a vacuum, where the dielectric is a model of an insulating spacer holding electrodes in various vacuum devices. Such gap configuration is typical as a model for studying physical mechanisms of an electrical breakdown or a flashover in a vacuum, in which the insulation ability is considerably lower than a gap without any insulating spacers. Many researchers have long investigated the mechanisms of flashover, and it is believed that the charging of the insulator surface is the p

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Cui, Yi, Guang Ning Wu, Yang Luo, and Kai Jiang Cao. "Multifactor Stress Life Model of Polyimide Film Used in Inverter-Fed Traction Motors." Applied Mechanics and Materials 121-126 (October 2011): 239–43. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.239.

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The inverter-fed traction motor is one of the key components in the locomotive. However, the motor insulation failures have repeatedly occurred in premature. The failure mechanism for insulation under continuous impulses is different from that under sine waves. The single stress approach in design stage and also in ageing studies offers relative simplicity, but it is inapplicable to real life operating conditions which mostly are of multi-stress type. In this paper, a novel test apparatus of insulation failure time was designed for accelerating aging test. Meanwhile, electrical breakdown exper

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Xia, Rong. "Characteristic Analysis and Measurement of Dielectric Loss in Non-Linear Insulating Materials." Advanced Materials Research 986-987 (July 2014): 1471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1471.

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Non-linear insulating material is widely used in the insulations of XLPE cable terminations and stator windings insulation of electric machines, and has obvious capability to improve the distribution of electric field. Actually, the dielectric loss factor of non-linear insulating materials is not equal to the tanδ describing linear insulating materials, and depends on applied voltage and their structures. This paper firstly discusses the difference between ac loss characteristic of non-linear dielectrics and linear dielectrics and presents a kind model of non-linear composite material. Based o

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Zhao, Jian Wen. "Recognition of Branch Insulation Parameters in Coal Mine Distribution Network using Least Squares Method." Advanced Materials Research 605-607 (December 2012): 851–54. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.851.

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The precondition for leakage protection is to identify insulations parameters exactly and quickly in coal mine distribution networks. A novel identification method of insulation parameters is presented. Time domain differential mathematic model of man-made leakage test is built, and then the least squares method is used to solve model coefficient, ground insulation resistances and ground capacitance are obtained correctly. This insulation identification method can not only calculate the total ground insulation resistance and the total ground capacitance but also provide the insulation paramete

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8

Cerkez, Idris, Hasan B. Kocer, and Roy M. Broughton. "A Practical Cost Model for Selecting Nonwoven Insulation Materials." Journal of Engineered Fibers and Fabrics 7, no. 1 (2012): 155892501200700. http://dx.doi.org/10.1177/155892501200700101.

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Elementary heat transfer in the range of density, thickness, and temperature normally used for house insulation, has been described experimentally for nonwoven structures. A model relating cost, density, and thermal efficiency of nonwoven insulating materials has been developed to aid in insulation materials selection and optimization of cost. Intrinsic to this system are material specific thermal conductivity slope coefficients readily derived from thermal conductivity versus specific volume plots.

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Komarov, I. V., D. A. Polyakov, K. I. Nikitin, and V. Yu Miroshnik. "Mathematical model of insulation breakdown prediction based on partial discharge characteristics." Omsk Scientific Bulletin, no. 175 (2021): 46–49. http://dx.doi.org/10.25206/1813-8225-2021-175-46-49.

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The paper investigates the existing mathematical models of insulation destruction. It has been determined that most of the models for assessing the residual life of insulation are based on models of thermal and thermo-oxidative destruction of insulation materials. Currently, solid dielectrics are gaining popularity, including crosslinked polyethylene, PVC, ethylene-propylene rubber, and others. In such dielectrics, it is possible to estimate the residual life in the short term. This possibility and necessity is due to the possibility of growth of tree defects under the influence of partial dis

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Namciu, Stephanie J., and R. E. K. Fournier. "Human Matrix Attachment Regions Are Necessary for the Establishment but Not the Maintenance of Transgene Insulation in Drosophila melanogaster." Molecular and Cellular Biology 24, no. 23 (2004): 10236–45. http://dx.doi.org/10.1128/mcb.24.23.10236-10245.2004.

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ABSTRACT Human matrix attachment regions (MARs) can insulate transgene expression from chromosomal position effects in Drosophila melanogaster. To gain insight into the mechanism(s) by which chromosomal insulation occurs, we studied the expression phenotypes of Drosophila transformants expressing mini-white transgenes in which MAR sequences from the human apoB gene were arranged in a variety of ways. In agreement with previous reports, we found that a single copy of the insulating element was not sufficient for position-independent transgene expression; rather, two copies were required. Howeve

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Tiso, Mattia, and Alar Just. "Design criteria for insulation materials applied in timber frame assemblies." Journal of Structural Fire Engineering 9, no. 3 (2018): 252–63. http://dx.doi.org/10.1108/jsfe-01-2017-0015.

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Purpose Insulation materials’ contribution to the fire resistance of timber frame assemblies may vary considerably. At present, Eurocode 5 provides a model for fire design of the load-bearing function of timber frame assemblies with cavities completely filled with stone wool. Very little is known about the fire protection provided by other insulation materials. An improved design model which has the potential to consider the contribution of any insulation material has been introduced by the authors. This paper aims to analyze the parameters that describe in a universal way the protection again

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Grabowska, Beata, and Jacek Kasperski. "The Thermal Conductivity of 3D Printed Plastic Insulation Materials—The Effect of Optimizing the Regular Structure of Closures." Materials 13, no. 19 (2020): 4400. http://dx.doi.org/10.3390/ma13194400.

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In the interest of environmental protection, attention should be paid to improving energy efficiency, through the use of appropriate insulations. They can be used in the construction industry, for plastic window frames, and the thermal insulation of buildings. It is also possible to use these materials in the electronics industry, for hermetic casings of devices, in the aviation industry, as well as in the food industry, as collective packaging for frozen food. The technology of using additive 3D printing to create prototype insulating materials made of plastic is proposed in this article. Mul

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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. Calcula

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Tao, Jia, Hao Zhan, Chuanxian Luo, Shengnan Hu, Xiongying Duan, and Minfu Liao. "Diffusion Properties of Gas Molecules in Oil–Paper Insulation System Based on Molecular Dynamics Simulation." Energies 17, no. 15 (2024): 3811. http://dx.doi.org/10.3390/en17153811.

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In order to reveal the migration and evolution of gas molecules in the actual oil–paper insulation composite system of transformer from the molecular level, the diffusion behavior of seven gas molecules (H2, CO, CO2, CH4, C2H2, C2H4, C2H6) generated during the operation and aging of oil-immersed transformers in the oil–paper composite insulation system is studied by molecular dynamics. Firstly, based on the molecular dynamics software, the model of the oil–paper composite insulation system and the gas molecule model is constructed. In order to compare and analyze the diffusion properties of ga

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15

Sarbu, Ioan, Emilian Valea, and Gabriel Ostafe. "Optimization of Insulation Design for Refrigerating Systems." Applied Mechanics and Materials 510 (February 2014): 202–7. http://dx.doi.org/10.4028/www.scientific.net/amm.510.202.

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Economic operation with minimal energy consumption and low costs of a cooled room or a refrigerant piping system depends largely on the quality and thickness of their insulation. The classical method of insulation rating for refrigeration systems is based on respect of the condition to prevent condensation of water vapours in the air on the surface of insulation or on limiting heat gain, but rarely leads to optimum in terms of a technical and economic criterion. In this paper are described some types of insulation for refrigeration applications and is developed a rating optimization model of t

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Chang, Yuan-Shang, and Ali Mosleh. "Probabilistic model of degradation of cable insulations in nuclear power plants." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 233, no. 5 (2019): 803–14. http://dx.doi.org/10.1177/1748006x19827127.

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Possible degradation of cable insulations exposed to radiation and heat is a safety and operational concern for nuclear power plants, particularly in the context of a license extension for the operation beyond original 40-year design life. Ethylene propylene rubber and silicone rubber are two major materials for the cable insulation. Degradation decreases the elongation at break of the insulation, which may lead to the exposure of the metal core in the cable, causing potential safety issues. This article proposes a mechanistic predictive model for the elongation at break as a function of time,

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Klebleev, T. I., and V. Yu Semenov. "Experimental Study of Heat Transfer in the Interwall Space of a Cryogenic Tank with Powder Insulation." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 3 (146) (September 2023): 113–26. http://dx.doi.org/10.18698/0236-3941-2023-3-113-126.

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Currently, double-wall cryogenic non-isothermal tanks with vacuum-powder or vacuum-multilayer insulation are used in storage and transportation of such cryogenic liquids as liquid nitrogen, oxygen and liquefied natural gas. If the inner vessel is disrupted, the liquid spills into the heat-insulating space and evaporates as a result of heat inflow from the environment. This increases pressure in the thermal insulation space. To ensure functioning of the tank, it is necessary to limit pressure increase in the heat-insulating space. Results of experiments on evaporation of the liquid nitrogen ent

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18

Grickus, Armands, and Sharif E. Guseynov. "On one Mathematical Model for Dynamics of Propagation and Retention of Heat over New Fibre Insulation Coating." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2015): 82. http://dx.doi.org/10.17770/etr2015vol3.504.

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<p class="R-AbstractKeywords"><span lang="EN-US">In circumstances, when it is important to replace insulation materials with high content of emissions during production it is necessary to create new heat and sound insulation material, which eliminates CO<sub>2</sub> emissions, develop its production techniques and technological machinery – raw material chopper, pulp mixer, termopress, dryer chamber, formatting knifes, determine technical control parameters and control equipment, develop mathematical model of the material and calculation methods for design works. It is n

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Bang, Seungmin, Ho-Seung Kim, Jae-Hong Koo, and Bang-Wook Lee. "Consideration of the Insulation Design Method on a ±200 kV Converter Valve Unit in an HVDC Converter Hall." Energies 14, no. 8 (2021): 2296. http://dx.doi.org/10.3390/en14082296.

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A converter valve unit, which converts Alternating Current (AC) to Directing Current (DC) and DC to AC, is one of the key elements of high voltage direct current (HVDC) transmission. The insulation design of a converter valve unit should be considered for air clearance according to the DC superimposed overvoltage and the insulator that maintains the insulation performance and the corona shield to suppress DC corona discharge. There is no prescribed standard for the insulation design of a converter valve unit. Moreover, insulation performance under an applied DC voltage has not yet been thoroug

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20

Azlan, Nur Farhana Mohd, Sharin Ab Ghani, Mohd Shahril Ahmad Khiar, Imran Sutan Chairul, and Mohamad Nazri Mohamad Din. "Investigating the effects of corrosion parameters on the surface resistivity of transformer’s insulating paper using a two-level factorial design." International Journal of Applied Power Engineering (IJAPE) 13, no. 2 (2024): 335. http://dx.doi.org/10.11591/ijape.v13.i2.pp335-342.

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The integrity of the insulation in oil-filled power transformers, shunt reactors, and high voltage bushings can be affected when copper dissolves in the insulating oil and then deposits onto the paper insulation. The presence of dissolved copper in the oil increases dielectric losses, while copper deposition significantly improves the conductivity of the paper insulation. Various factors, including temperature, oxygen, sulfur groups, passivators, and ageing time, have been found to contribute to the acceleration of corrosion activity in transformer insulating oils. Unfortunately, there is a la

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Azlan, Nur Farhana Mohd, Ghani Sharin Ab, Mohd Shahril Ahmad Khiar, Imran Sutan Chairul, and Mohamad Nazri Mohamad Din. "Investigating the effects of corrosion parameters on the surface resistivity of transformer's insulating paper using a two-level factorial design." International Journal of Applied Power Engineering (IJAPE) 13, no. 2 (2024): 335–42. https://doi.org/10.11591/ijape.v13.i2.pp335-342.

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The integrity of the insulation in oil-filled power transformers, shunt reactors, and high voltage bushings can be affected when copper dissolves in the insulating oil and then deposits onto the paper insulation. The presence of dissolved copper in the oil increases dielectric losses, while copper deposition significantly improves the conductivity of the paper insulation. Various factors, including temperature, oxygen, sulfur groups, passivators, and ageing time, have been found to contribute to the acceleration of corrosion activity in transformer insulating oils. Unfortunately, there is a la

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Nur Farhana Azlan, Sharin Ab Ghani, Mohd Shahril Ahmad Khiar, Imran Sutan Chairul, and Nur Asiah Muhamad. "Effects of Oil Temperature, Elemental Sulfur Concentration, and Aging Time on the Corrosion Activity of Transformer Mineral Oil Using Two-Level Factorial Design." Journal of Advanced Research in Applied Sciences and Engineering Technology 64, no. 1 (2025): 70–78. https://doi.org/10.37934/araset.64.1.7078.

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The insulation of oil-filled power transformers, shunt reactors, and high voltage bushings may be affected by copper dissolution in the insulating oil and copper deposition on the paper insulation. Dissolved copper increases dielectric losses in the oil while copper deposition can significantly increase the conductivity of the paper insulation. The corrosion activity of transformer insulating oils has been shown to be accelerated by multiple factors such as temperature, oxygen, sulfur groups, passivators, and aging time. To date, there is a lack of studies that systematically design and quanti

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Motakef, S., and M. A. El-Masri. "Liquid Diffusion in Fibrous Insulation." Journal of Heat Transfer 107, no. 2 (1985): 299–306. http://dx.doi.org/10.1115/1.3247414.

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Vapor condensation in insulated structures degrades their physical properties as well as thermal performance. Motion of the condensate within the insulation is a crucial factor in analyzing annual moisture retention in building shells. The diffusion of liquid can be caused by several driving potentials. A model for isothermal liquid transport in fibrous insulation is presented. The model relates liquid diffusion to the characteristics of the insulation. These are identified as void-fraction and its spatial distribution, mean fiber radius, directionally index, and tortuousity factor. Due to the

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Antošová, Naďa, Patrik Šťastný, Marek Petro, and Štefan Krištofič. "Application of additional insulation to ETICS on surfaces with biocorrosion." Acta Polytechnica 61, no. 5 (2021): 590–600. http://dx.doi.org/10.14311/ap.2021.61.0590.

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The paper presents partial outputs from an experiment that demonstrated the impact of applying an additional insulation on an existing contact insulation system with a green-algae surface. The aim was mainly to detect the development of microorganisms in the gap between the original and the new insulation. The existing ETICS on the polystyrene-based contact thermal insulation system and EPS-based additional thermal insulation were used in the experiment. A theoretical modelling of temperature conditions showed that this type of doubling the insulation presented the highest risk of condensation

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Mazur, Kamila Ewelina, Witold Jan Wardal, Jan Barwicki, and Mikhail Tseyko. "Thermal Insulation of Agricultural Buildings Using Different Biomass Materials." Energies 18, no. 3 (2025): 636. https://doi.org/10.3390/en18030636.

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The main goal of the article is to present the effectiveness of biomass as a thermal insulator and estimate the global potential for using biomass, considering the perspective of sustainable development and improving energy efficiency in agricultural building construction. The article presents two types of piggery construction: one using typical materials like concrete and the other using biomass-based materials. The evaluation is based on carbon footprint and embodied energy indicators. The model calculations developed in this article may be used in the future for life cycle assessment (LCA)

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Sayadi, Ahmed, Djillali Mahi, Issouf Fofana, et al. "Modeling and Predicting the Mechanical Behavior of Standard Insulating Kraft Paper Used in Power Transformers under Thermal Aging." Energies 16, no. 18 (2023): 6455. http://dx.doi.org/10.3390/en16186455.

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The aim of this research is to predict the mechanical properties along with the behaviors of standard insulating paper used in power transformers under thermal aging. This is conducted by applying an artificial neural network (ANN) trained with a multiple regression model and a particle swarm optimization (MR-PSO) model. The aging of the paper insulation is monitored directly by the tensile strength and the degree of polymerization of the solid insulation and indirectly by chemical markers using 2-furfuraldehyde compound content in oil (2-FAL). A mathematical model is then developed to simulat

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Khusnutdinova, Margarita, Aigul Haibullina, Alex Sinyavin, and Aidar Hayrullin. "Model of heat transfer in pipeline insulation in a chamber with a rotating heating pipe." E3S Web of Conferences 578 (2024): 01041. http://dx.doi.org/10.1051/e3sconf/202457801041.

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This study numerically investigates the effect of rotation on the uniformity of temperature distribution in pipeline insulation, as well as the accuracy of measuring thermal conductivity for a pipe using the steady- state flux approach with non-uniform external heat transfer. It is shown that the use of rotation uniforms temperature fields and radial heat flux inside the insulation, allowing thermal conductivity tests to be accurate to 0.1%. The effect has been validated for a variety of insulating properties, including porous materials with high permeability.

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Golubev, Dmitry, Dmitry Kovalev, and Sergey Elfimov. "Development of a thermal model of a bus conductor with polymer-gas insulation for power transmission of offshore wind turns." Energy Systems 7, no. 3 (2022): 36–47. http://dx.doi.org/10.34031/es.2022.3.004.

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On the basis of the National Research University "MPEI", within the framework of the project to create a busbar with polymer-gas insulation for the transmission of electricity from offshore wind turbines, a study is being carried out to develop insulating structures for high-voltage busbars. The work is devoted to the development and justification of the design of a special conductor with combined insulation (polymer-gas) for laying in sea water for the transmission of electrical energy from wind turbines, where a polymer coating of current-carrying elements is used to increase the electrical

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Kiselev, V. I., T. O. Vakhromeeva, and A. I. Fedyanin. "Increasing reliability of traction electric motors of diesel locomotives taking into account thermophysical parameters of insulation and armature winding conductors." RUSSIAN RAILWAY SCIENCE JOURNAL 81, no. 3 (2022): 213–20. http://dx.doi.org/10.21780/2223-9731-2022-81-3-213-220.

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Introduction. The issue of ensuring the operable state of the DC traction motor is relevant due to its large-scale use on diesel locomotives, including modern powerful motors, operating on lines with increased train masses. At present, a rather difficult situation has developed in the locomotive industry with the failure of diesel locomotive traction electric motors due to a decrease in the insulation resistance of the armature windings of the electric motors and their subsequent breakdowns: up to 28 % of the total number of failures of electric motors are due to breakdown of the hull insulati

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Wang, Hongwei, and Shuguang Zhang. "The nomogram establishment of thermal conductivity and strength of insulating concrete for high temperature mine." E3S Web of Conferences 118 (2019): 01001. http://dx.doi.org/10.1051/e3sconf/201911801001.

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The insulating concrete can be effectively reduced heat exchange between surrounding rock and ventilation air, which is of positive significance to mine cooling and energy conservation. The law of the mixing amount of insulation material on thermal conductivity and strength was discovered through testing 75 specimens of insulating concrete used for mine. Based on new effective medium theory, calculation model of coefficient of heat conductivity is deduced, and its parameters are acquired with the surface regression analysis method, then the mixing threshold of insulation material is determined

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Ulutaş, Alptekin, Figen Balo, and Ayşe Topal. "Identifying the Most Efficient Natural Fibre for Common Commercial Building Insulation Materials with an Integrated PSI, MEREC, LOPCOW and MCRAT Model." Polymers 15, no. 6 (2023): 1500. http://dx.doi.org/10.3390/polym15061500.

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Building insulation is the most respected among the compatible and effective energy conservation technologies available today, as it also reduces yearly energy costs and negative environmental effects. A building envelope is made up of various insulation materials that are important in determining a building’s thermal performance. Proper insulation material selection concludes in less energy requisition for operation. The purpose of this research is to supply information about natural fibre insulating materials used in construction insulation to maintain energy efficiency, as well as to recomm

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Balo, Figen, and Alptekin Ulutaş. "Energy-Performance Evaluation with Revit Analysis of Mathematical-Model-Based Optimal Insulation Thickness." Buildings 13, no. 2 (2023): 408. http://dx.doi.org/10.3390/buildings13020408.

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This study investigates the optimum insulation thickness value using MATLAB Optimization Toolbox based on a mathematical model for sandwich walls that are formed with different insulation-building materials by different fuel types for a particular city located in the second climatic region of Turkey. In the second stage of study, using the BIM-based Revit simulation program, a building was designed with the same building-insulation materials under the same climate conditions. The six different wall performances were compared for the designed building. The study proposes a comprehensive approac

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Antonyova, Anna, Peter Antony, and Endra Joelianto. "Modeling of Dynamic Responses in Building Insulation." Journal of Engineering and Technological Sciences 47, no. 5 (2015): 536–48. http://dx.doi.org/10.5614/j.eng.technol.sci.2015.47.5.6.

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In this research a measurement systemwas developedfor monitoring humidity and temperature in the cavity between the wall and the insulating material in the building envelope. This new technology does not disturb the insulating material during testing. The measurement system can also be applied to insulation fixed ten or twenty years earlier and sufficiently reveals the quality of the insulation. A mathematical model is proposed to characterize the dynamic responses in the cavity between the wall and the building insulation as influenced by weather conditions.These dynamic responses are manifes

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Bai, Li, Yan Wang, and Xiao Long Liu. "Numerical Simulation of Soil Temperature Field around the Rural Water Supply Pipe in Severe Cold Area." Advanced Materials Research 955-959 (June 2014): 3369–72. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.3369.

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On the basis of the establishment of the physical model of shallow buried water supply pipe with external thermal insulation layer unsteady heat transfer , using the Matlab-PDE toolbox for solving. Analyzing the operation of shallow buried insulating water supply pipe and temperature field around the soil changes over time. Results show that this kind of shallow buried and thermal insulation layer of the water supply pipe run three months, the temperature of the outer wall of the insulation layer is 3 ℃ and it can basically solve frost heave phenomena of water supply pipe running in winter.

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Noumo, Prosper Gopdjim, Donatien Njomo, Kevin Zepang Nana, and Leonard Ribot Chuisseu Nguewo. "Numerical Simulation of the Minimum Insulation Thickness to Thermally Design a Subsea Pipeline Carrying an Oil and Gas Flow." International Journal of Heat and Technology 39, no. 3 (2021): 763–74. http://dx.doi.org/10.18280/ijht.390310.

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This paper considered an existing subsea pipeline transporting an oil and gas flow, and proposed to find the best thermal insulating material and the required thickness of insulation necessary to meet an output temperature of 40℃ and a pressure of 2.4MPa so as to avoid flow assurance issues. MATLAB and PIPESIM software were employed to run the simulations of the temperature and pressure profiles along the considered pipeline. Data used for the simulations were obtained from open literature. Results obtained from our simulations in MATLAB are validated using PIPESIM software, measured values an

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Brahami, Youssouf, Amidou Betie, Fethi Meghnefi, Issouf Fofana, and Zié Yeo. "Development of a Comprehensive Model for Drying Optimization and Moisture Management in Power Transformer Manufacturing." Energies 18, no. 4 (2025): 789. https://doi.org/10.3390/en18040789.

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The presence of moisture in the insulation of power transformers accelerates the degradation of both paper and oil, thereby increasing the risk of unexpected failures. Due to the hygroscopic nature of cellulose, the insulation can retain up to 8% moisture after the transformer manufacturing process. Reducing this moisture content is crucial in extending the operational lifespan of transformers. The drying cycle of paper insulation is a critical step in power transformer manufacturing, directly influencing the insulation’s longevity and overall performance. This paper introduces a nomogram that

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Khodja, Fouad, and Younes Mimoun. "An intelligent system based on neural networks for simulating a high voltage phenomena." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e11117. https://doi.org/10.54021/seesv5n2-567.

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Insulators are among the most important components of overhead electrical energy transport and distribution networks since they provide both the mechanical support of the parts brought to high voltage and the electrical insulation of the latter, with grounded or energized other components (Samakosh and al, 2019), (M. Faramarzi Palangar and al, 2020). Indeed, a disturbance of the electrical insulation provided by the insulator can lead, in certain circumstances, to its bypassing and therefore a major risk to the reliability and operation of the overhead electrical energy transmission system. Se

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Bigdeli, Mehdi, and Jafar Aghajanloo. "Condition assessment of transformer insulation using dielectric frequency response analysis by artificial bee colony algorithm." Archives of Electrical Engineering 65, no. 1 (2016): 45–57. http://dx.doi.org/10.1515/aee-2016-0004.

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Abstract Transformers are one of the most important components of the power system. It is important to maintain and assess the condition. Transformer lifetime depends on the life of its insulation and insulation life is also strongly influenced by moisture in the insulation. Due to importance of this issue, in this paper a new method is introduced for determining the moisture content of the transformer insulation system using dielectric response analysis in the frequency domain based on artificial bee colony algorithm. First, the master curve of dielectric response is modeled. Then, using prop

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Cheetham, Peter, Jose Viquez, WooJin Kim, Lukas Graber, Chul H. Kim, and Sastry V. Pamidi. "High-Temperature Superconducting Cable Design Based on Individual Insulated Conductors." Advances in Materials Science and Engineering 2018 (November 1, 2018): 1–10. http://dx.doi.org/10.1155/2018/3637873.

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The idea of insulating individual high-temperature superconducting (HTS) tapes was explored as a dielectric design to reduce the risk and complexity of HTS cable manufacturing. Applying insulation on individual HTS tapes is amenable to continuous manufacturing processes and opens up material choices for the insulation. In this study, heat shrink insulation was selected as the material choice for exploring the possibility of this design philosophy because of its commercial availability in multiple thicknesses. A systematic set of selection criteria was developed for the selection of appropriate

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Shrayber, Marina A. "The development of residual stresses in the insulation of traction motors during the curing of the impregnation composition." Transport of the Urals, no. 1 (2024): 35–40. http://dx.doi.org/10.20291/1815-9400-2024-1-35-40.

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When curing in the insulation of traction electric motors of diesel locomotives, residual stresses arise, which significantly affect the deformation and change in the mechanical properties of insulating materials. Experimental measurement of residual stresses during solidification of the impregnation composition is the most objective and reliable, but at the same time expensive and complex method. Therefore, mathematical modeling methods are more preferable for determining the level of residual stresses. The paper considers a model for predicting the level of residual stresses in insulation du

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Li, Jian Guang, Li Ping Tong, and Li Hui Tian. "Thermal Performance Analysis for a New External Wall Insulation System." Advanced Materials Research 383-390 (November 2011): 6476–83. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6476.

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Based on the existing quality problems of external wall insulation system, a new external wall insulation system was developed through the rational use of closed air layer’s thermal insulation performance. Considering three kinds of ways of heat transfer-- convection, conduction and radiation and using the coefficient of air equivalent thermal conductivity to obtain the thermal resistance in the air layer, compared with the thermal resistance at different thicknesses in the new system using polyurethane and polystyrene board of insulation material with two different thicknesses, the authors ca

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L., Sanjeev Kumar, Ramachandra B., and Senthil Kumar S. "Investigation of model transformer insulation behavior during PD activity in Di-Benzo-Di-Sulfide Sulphur contaminated transformer oil using online tan delta measurement." Engineering and Technology Journal 07, no. 09 (2022): 1444–48. https://doi.org/10.5281/zenodo.7053587.

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Sulphur can be present in mineral insulating oil and can manifest in stable, highly reactive and corrosive form. The corrosive sulphur reacts with the copper conductor in transformer and forms semi conductive copper sulphide at the surface of the copper conductor. The paper insulation used on the copper conductor may get damaged due to copper sulfide deposits which also affect the partial discharge activities prevalent in the transformer paper-oil insulation. The affect of Sulphur on model transformer paper-oil insulation is studied with online measurement of Dissipation factor (tanδ) an

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Sambucci, Matteo, Federico Savoni, and Marco Valente. "Aerogel Technology for Thermal Insulation of Cryogenic Tanks—Numerical Analysis for Comparison with Traditional Insulating Materials." Gels 9, no. 4 (2023): 307. http://dx.doi.org/10.3390/gels9040307.

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The traditional choice of insulation material for liquefied natural gas (LNG) transportation with cryogenic tankers is the back-filled perlite-based system. However, aiming to further cut down the insulation cost, spare additional arrangement space, and provide safety in installation and maintenance, the requirement of looking for alternative materials still exists. Fiber-reinforced aerogel blankets (FRABs) could represent good candidates in designing insulation layers for LNG cryogenic storage because of their ability to ensure adequate thermal performance without the need to create deep vacu

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Gomez, Ricardo Soares, Túlio Rafael Nascimento Porto, Kelly Cristiane Gomes, et al. "Thermal analysis in an air conditioning duct: An experimental design approach." Research, Society and Development 9, no. 12 (2020): e20291211140. http://dx.doi.org/10.33448/rsd-v9i12.11140.

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

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Jiang, Zaijun, Xin Li, Heng Zhang, et al. "Research Progress and Prospect of Condition Assessment Techniques for Oil–Paper Insulation Used in Power Systems: A Review." Energies 17, no. 9 (2024): 2089. http://dx.doi.org/10.3390/en17092089.

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Oil–paper insulation is the critical insulation element in the modern power system. Under a harsh operating environment, oil–paper insulation will deteriorate gradually, resulting in electrical accidents. Thus, it is important to evaluate and monitor the insulation state of oil–paper insulation. Firstly, this paper introduces the geometric structure and physical components of oil–paper insulation and shows the main reasons and forms of oil–paper insulation’s degradation. Then, this paper reviews the existing condition assessment techniques for oil–paper insulation, such as the dissolved gas ra

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He, Zhiqiang, Heping Xie, Mingzhong Gao, et al. "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 materi

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Aksakal, Berrak, Alptekin Ulutaş, Figen Balo, and Darjan Karabasevic. "A New Hybrid MCDM Model for Insulation Material Evaluation for Healthier Environment." Buildings 12, no. 5 (2022): 655. http://dx.doi.org/10.3390/buildings12050655.

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One of the easiest and most common methods for effectively reducing building energy demand is the selection of adequate thermal insulation materials. Thermal insulation is a substantial contribution and an evident, logical and practical first stage toward improving energy performance, particularly in envelope-load-dominant structures located in difficult climate zones. Today’s insulating materials come in a broad variety of sizes and shapes, each with its a own qualities. It is well acknowledged that material selection is one of the most difficult and time-consuming aspects of a construction p

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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 (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

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bin Shammuin, Mohammad Hafizuddin, and Boon Tuan Tee. "Preliminary Study of Alternative Wall Insulation Materials for Home Residence." Applied Mechanics and Materials 699 (November 2014): 384–87. http://dx.doi.org/10.4028/www.scientific.net/amm.699.384.

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With the growing interest of sustainable and green technology, there is a need of finding the alternative for wall insulation materials. The objective of this research is to evaluate the effectiveness of two types of insulation for the house wall as well as study the effect of those materials on temperature distribution in the house. Insulating materials that have been selected for this preliminary study are polystyrene, cellulose and coconut fiber. The measurement is conducted by using reconfigurable model house where the insulation materials can be inserted in the wall, roof and floor. The t

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Zhu, Guangya, Shiyu Ma, Shuai Yang, Yue Zhang, Bingyan Wang, and Kai Zhou. "Identification of Dielectric Response Parameters of Pumped Storage Generator-Motor Stator Winding Insulation Based on Sparsity-Enhanced Dynamic Decomposition of Depolarization Current." Energies 18, no. 13 (2025): 3382. https://doi.org/10.3390/en18133382.

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Accurate diagnosis of the insulation condition of stator windings in pumped storage generator-motor units is crucial for ensuring the safe and stable operation of power systems. Time domain dielectric response testing is an effective method for rapidly diagnosing the insulation condition of capacitive devices, such as those in pumped storage generator-motors. To precisely identify the conductivity and relaxation process parameters of the insulating medium and accurately diagnose the insulation condition of the stator windings, this paper proposes a method for identifying the insulation dielect

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