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Auswahl der wissenschaftlichen Literatur zum Thema „Moisture and thermal regulating textile“
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Zeitschriftenartikel zum Thema "Moisture and thermal regulating textile"
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Huang, Leping, Ying Chen, Zhaobao Xu, Cui He, Youmu Li, Jinchao Zhao und Youhong Tang. „Regulating Al2O3/PAN/PEG Nanofiber Membranes with Suitable Phase Change Thermoregulation Features“. Nanomaterials 13, Nr. 16 (12.08.2023): 2313. http://dx.doi.org/10.3390/nano13162313.
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To address the thermal comfort needs of the human body, the development of personal thermal management textile is critical. Phase change materials (PCMs) have a wide range of applications in thermal management due to their large thermal storage capacity and their isothermal properties during phase change. However, their inherent low thermal conductivity and susceptibility to leakage severely limit their application range. In this study, polyethylene glycol (PEG) was used as the PCM and polyacrylonitrile (PAN) as the polymer backbone, and the thermal conductivity was increased by adding spherical nano-alumina (Al2O3). Utilizing coaxial electrospinning technology, phase-change thermoregulated nanofiber membranes with a core-shell structure were created. The study demonstrates that the membranes perform best in terms of thermal responsiveness and thermoregulation when 5% Al2O3 is added. The prepared nanofiber membranes have a melting enthalpy of 60.05 J·g−1 and retain a high enthalpy after 50 cycles of cold and heat, thus withstanding sudden changes in ambient temperature well. Additionally, the nanofiber membranes have excellent air permeability and high moisture permeability, which can increase wearer comfort. As a result, the constructed coaxial phase change thermoregulated nanofiber membranes can be used as a promising textile for personal thermal management.
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Пожилов-Несміян, Г. М., Н. П. Супрун und Т. В. Гірна. „РОЗРОБКА АПЛІКАЦІЙНИХ ВКЛАДОК У ШВЕЙНІ ВИРОБИ ДЛЯ ЛЮДЕЙ З ІНВАЛІДНІСТЮ“. Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 142, Nr. 1 (03.06.2020): 63–70. http://dx.doi.org/10.30857/1813-6796.2020.1.6.
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Determination of the influence of raw material composition and structure of textile composite materials with fibrous carbon sorbent on their moisture absorption properties. Two-layer and three-layer composite application napkins were obtained by thermal connection of non-woven needle punch fabrics with carbon fabric. In experimental studies standardized methods for determining of moisture sorption and moisture drying rates were used. It is estimated that daily long-term stay of people with spinal injuries in a wheelchair in a fixed sitting position contributes to the occurrence of ulcers in the places where the bones extend close to the skin surface. It is proposed for people with limited motor ability to use on these places in the apparel garments appliqué linings of therapeutic and prophylactic purpose on the basis of active fibrous carbon sorbents. To provide the necessary prolonged in time sorption-kinetic properties, a number of composite textile materials were produced by the method of thermal connection, in which the medical carbon fabric was combined with needle-punched nonwoven web structures, obtained on the basis of natural plant fibers. The investigation of the influence of raw material composition and structure of nonwoven base on the peculiarities of moisture absorption and drying of such systems have proved the possibility of directed regulation of these processes. The influence of the type of non-woven bases on the peculiarities of regulating the processes of moisture absorption and moisture removal of application composites based on natural plant fibers with carbon fabric is determined. A new range of textile application composite materials with adjustable moisture-transport properties has been developed for use as tabs in medical and preventive garments at places of contact with pressure ulcers.
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Santos, Gilda, Rita Marques, Miguel Pinto, Francisco Pinheiro und Patricia Ferreira. „Innovative clothing system for protection against perforation“. Communications in Development and Assembling of Textile Products 1, Nr. 2 (03.12.2020): 121–29. http://dx.doi.org/10.25367/cdatp.2020.1.p121-129.
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Opuntia ficus-indica is a cactus species that has a large potential in several applications. Despite its enormous potential, the production process is still a concern. The harvest process is still mostly manual and implies a dangerous exposure of the human being not only to harsh environmental conditions such as high temperatures but also to the big and resistant spines of the Opuntia ficus-indica. To fulfill the lack of suitable protection equipment for this specific activity, emerged a project with the aim of producing an innovative clothing system composed by textile structures that can act as a barrier to spines and glochids without compromising breathability and presenting a suitable fitting, ergonomics and freedom of movements. This paper will focus on the development of a multilayer clothing system in which the outer layer provide protection against perforation and the inner layer acts like a second skin providing thermal comfort and freedom of movement, so the producers can withstand high temperatures. Concerning the inner layer, several textile structures were developed to analyze the impact on breathability, moisture management and thermal regulation. For the outer layer more than 20 fabrics were developed and submitted to laboratory tests to study their perforation and tearing resistance (according to EN 388).Afterward two structures were selected to proceed and new finishing’s were developed to prevent the adhesion of the glochids to the textile substrate and simultaneously to give water repellency. Results achieved for the clothing solution from laboratory and field tests with end-users, will be presented.
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McCann, Jane. „Design for Ageing Well: Improving the Quality of Life for the Ageing Population Using a Technology Enabled Garment System“. Advances in Science and Technology 60 (September 2008): 154–63. http://dx.doi.org/10.4028/www.scientific.net/ast.60.154.
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We are at the beginning of a new industrial revolution with the merging of textiles and electronics. Current markets for clothing and electronics have been separate. Medical devices have been developed for ‘ill people’ with little aesthetic appeal and wearable technology has not been readily accepted by some intended markets due to badly designed user-interfaces. Little has been done to address the design requirements of older wearers with regard to aspects of human physiology in terms of sizing, fit, predominant posture, thermal regulation, moisture management, protection and the psychological ‘feel good factor’. Emerging technologies may be confusing to traditional clothing designers, while electronics and medical experts are not normally conversant with textile technology. A shared 'language' and vision is needed to easily communicate between these sectors and older wearers. The application of smart textiles in a clothing ‘layering system’ may enhance the quality of life of the active ageing. To be acceptable, clothing must be comfortable, stylish and function reliably in relation to the technical, aesthetic and cultural userneeds. This paper will focus on the needs of the 65-75 year old age group who have experienced the influence of design throughout their lives. A design methodology, driven by meaningful end-user research, will be introduced that addresses the potential for a comfortable and stylish clothing system to promote the wellness and autonomy of this growing community.
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Howie, Nicholas, und Samuel Rabey. „A Meta-Analysis on the Advancement on the thermodynamic properties of clothing in extreme cold environments“. PAM Review Energy Science & Technology 6 (24.05.2019): 73–87. http://dx.doi.org/10.5130/pamr.v6i0.1548.
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When two systems with different energies are in contact, the heat from the higher energy system will move into the lower energy system and the two will reach equilibrium. Humans in extreme cold environments will perish if they do not keep appropriate heat contained within their system and thus it is the object of much historic research to maintain heat within a system for as long as possible. Research and development of cold weather clothing focuses on a range of methods regulating heat flow between clothing layers. Modern research focuses on air gaps between layers of clothing, development of new conventional insulating textiles and contemporary solutions such as the use of Phases Change [1]. The purpose of this paper is to conglomerate all of the current research into one meta-analysis highlighting the gaps in the research and potential areas in need of further study, and to propose a new article of cold weather apparel utilizing the most effective advancements from the papers collected in this study. It was found that each component of cold climate clothing affects an aspect of thermal resistivity. Thickness affects the windchill resistance, the specific heat increases thermal resistance of the fabric, while humidity increases thermal conductivity, air gaps reduce it and the rigidity affects all of these factors. Our findings suggest if the air gaps are above 8 mm, natural convection currents can occur which increase the thermal and moisture transfer between clothing layers. By analysing all of these factors, a new prototype garment was able to be proposed.
Keywords: Cold environment; clothing; thermoregulation.
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GOHAR, EMADELDIN SAYED, und ADNAN AHMED MAZARI. „Thermal performance of protective clothing (firefighter) under extreme ambient conditions“. Industria Textila 74, Nr. 05 (31.10.2023): 542–46. http://dx.doi.org/10.35530/it.074.05.20237.
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Protective clothing is made up of multiple layers of textile, which include thermal barrier, moisture barrier, chemical protection and heat radiation protection layers etc. This clothing is commonly used by workers working in the chemical industry, blast furnaces, glass industry, industrial boilers and many more. The ambient conditions for these workplaces are humid and hot in which the clothing is designed for the external protection of heat and fluids but the neglected issue is the internal heat and moisture accumulation. This makes the clothing extremely uncomfortable and significantly reduces the workability of the wearer. The multi-layered structure of this clothing causes the body moisture and heat to trap in between layers, which in extreme ambient conditions like working near the furnace or flash fire causes body burns, these “steam burns” are common and considered to be caused by the condensed moisture trapped in the layers of protective garment. This research aims to firstly investigate the moisture flow through hybrid textile layers and its effect on heat transfer and then secondly to see the impact of extreme radiation flux on the moisture flow inside the textile layers and improvement by using Aerogels.
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Gu, Hai Lan, und Wei Zhang. „Optimization Research in Heat-Moisture Comfort Evaluation System Parameters of Fabric Based on Matlab“. Applied Mechanics and Materials 644-650 (September 2014): 1514–18. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1514.
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Heat-moisture comfort of the fabric is an important part to judge its performance. The research of heat-moisture is a frontier topic in the field of modern textile technology, increasingly brought to the attention of the national textile field researchers and become a hot issue worldwide.This topic research personnel, in the use of multiple regression analysis method to establish the fabric heat transfer law of mathematical model, using the method of unified goal of thermal and moisture comfortable building fabric performance comprehensive evaluation system, based on the thermal wet comfort properties of fabrics parameters optimization research. In establishing the evaluation system of fabric heat-moisture comfort performance, mathematical knowledge-based on Matlab software is a tool to solve practical problems. Heat-moisture transfer fabric and strive to build a mathematical model of the law, as well as comprehensive evaluation system of heat-moisture comfort performance, providing an important reference for technical textile enterprises to develop new products, enhance and improve the performance of the heat and moisture comfort of fabric.
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Hes, Lubos, Roshan Unmar und Satyadeo Rosunee. „Factors influencing precision of determination of thermal parameters of textile fabrics“. Journal of Textile Engineering & Fashion Technology 9, Nr. 4 (11.08.2023): 101–4. http://dx.doi.org/10.15406/jteft.2023.09.00341.
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Published data of thermal conductivity of particularly natural textile materials can be incorrect, due to uneasy way of testing of this parameter. Moreover, these data can be strongly affected by moisture of these materials. In the paper, the mentioned and other factors, which reduce the precision of thermal insulation and thermal contact properties of textile fabrics are presented and discussed.
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Schönfisch, David, Michael Göddel, Jörg Blinn, Christian Heyde, Heiko Schlarb, Wim Deferme und Antoni Picard. „New Type of Thermal Moisture Sensor for in‐Textile Measurements“. physica status solidi (a) 216, Nr. 12 (14.02.2019): 1800765. http://dx.doi.org/10.1002/pssa.201800765.
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Wijenayaka, Lahiru A., Ruchira N. Wijesena, Nadeeka D. Tissera, W. R. L. Nisansala Bandara, Gehan J. Amaratunga und K. M. Nalin De Silva. „Infrared absorbing nanoparticle impregnated self-heating fabrics for significantly improved moisture management under ambient conditions“. Royal Society Open Science 8, Nr. 5 (Mai 2021): 202222. http://dx.doi.org/10.1098/rsos.202222.
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Propensity of a textile material to evaporate moisture from its surface, commonly referred to as the ‘moisture management’ ability, is an important characteristic that dictates the applicability of a given textile material in the activewear garment industry. Here, an infrared absorbing nanoparticle impregnated self-heating (IRANISH) fabric is developed by impregnating tin-doped indium oxide (ITO) nanoparticles into a polyester fabric through a facile high-pressure dyeing approach. It is observed that under simulated solar radiation, the impregnated ITO nanoparticles can absorb IR radiation, which is effectively transferred as thermal energy to any moisture present on the fabric. This transfer of thermal energy facilitates the enhanced evaporation of moisture from the IRANISH fabric surface and as per experimental findings, a 54 ± 9% increase in the intrinsic drying rate is observed for IRANISH fabrics compared with control polyester fabrics that are treated under identical conditions, but in the absence of nanoparticles. Approach developed here for improved moisture management via the incorporation of IR absorbing nanomaterials into a textile material is novel, facile, efficient and applicable at any stage of garment manufacture. Hence, it allows us to effectively overcome the limitations faced by existing yarn-level and structural strategies for improved moisture management.
Dissertationen zum Thema "Moisture and thermal regulating textile"
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Kaleem, ullah Hafiz Muhammad. „Développement de fibres bicomposantes innovantes pour le textile de confort thermique“. Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0034.
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Cette étude s'inscrit dans le cadre du projet européen Interreg entre la Haute de France et la Belgique. Le projet s'appelle Photonitex.L'objectif de ce projet est de développer un textile intelligent de régulation thermique personnelle qui contrôle dynamiquement la température de la peau. Ce travail a été réalisé en collaboration entre le Centre Européen des Textiles Innovants (CETI) et l'Ecole Nationale Supérieure des Arts et Industries Textiles (ENSAIT).L'objectif de cette thèse est de développer une fibre bi-composant pour un textile de confort thermique. La revue de la littérature a été faite pour sélectionner les matériaux polymères les plus appropriés qui sont couramment utilisés dans l'industrie textile. De plus, sur la base de la revue de la littérature, la conception des fibres trilobées bicomposantes a été finalisée pour réaliser le textile de confort thermique dynamique. De plus, les matériaux polymères utilisés doivent présenter une différence hydrophile pour obtenir les propriétés thermiques dynamiques des tissus. Le matériau intérieur de cette fibre trilobée bicomposant doit être plus hydrophile que le matériau extérieur. PA6 et PA6-6 ont été sélectionnés comme noyau hydrophile et matériau extérieur hydrophobe en PET pour les filaments bicomposants trilobés. Cependant, PA6 et PA6-6 sont incompatibles et non miscibles au PET. L'enjeu majeur pour obtenir les fibres bicomposants recherchées est d'acquérir une adhérence suffisante à l'interface pour éviter le pré-clivage ou la séparation entre ces deux matériaux polymères. Afin d'améliorer leur miscibilité à l'interface, PA12 a été ajouté dans PA6 et PA6-6 à 5, 10, 15 % en poids via un procédé de mélange de polymères. les matériaux polymères jouent un rôle important. Afin de sélectionner les matériaux les plus appropriés pour la fibre bicomposant trilobée, des études rhéologiques ont été menées sur des mélanges purs et polymères à l'aide d'un rhéomètre capillaire. De plus, les propriétés hydrophiles de chaque polymère et de leurs mélanges ont également été testées sur des tissus tricotés avec des mesures d'angle de contact et de mèche. Pour évaluer l'effet du PA12 sur l'adhérence interfaciale du PET et du PA6, des fibres bicomposants PET/PA6 gaine/cœur ont été produites via un procédé de filage à l'état fondu et l'adhérence interfaciale a été étudiée par des techniques (test de traction, analyse thermique mécanique dynamique (DMTA), diffraction des rayons X à grand angle (WAXD), calorimétrie différentielle à balayage (DSC) et microscope électronique à balayage (SEM)). Sur la base des résultats obtenus à partir des techniques mentionnées ci-dessus, la composition la plus appropriée a été produite en fibres bicomposantes trilobées pour les tissus de confort thermique. Des études de simulation ont également été réalisées à l'aide du logiciel Compuplast 3D FEM pour optimiser les paramètres du processus de filage à l'état fondu et produire des fibres bicomposantes trilobées.Le textile fabriqué à partir de ces fibres bicomposantes innovantes montrera un phénomène d'auto-actionnement autonome, auto-responsabilisé et adaptatif à l'environnement. Cela contribuera à atténuer les consommations d'énergie plus élevées des systèmes de chauffage, de refroidissement et de ventilation intérieurs conventionnels et, à terme, à minimiser les consommations d'énergie globales et les problèmes climatiquesThis study is part of Interreg European Project between Haute de France and Belgium. The project is called Photonitex. The aim of this project is to develop a personal thermal regulation intelligent textile that dynamically controls skin temperature. This work was done in collaboration between Centre Européen des Textiles Innovants (CETI) and School National Superior of Textile Arts and Industries (ENSAIT).The objective of this thesis is to develop a bicomponent fibers for thermal comfort textile. The literature review was done to select the most suitable polymer materials that are commonly used in textile industry. In addition, based on the literature review, the design of the trilobal bicomponent fibers was finalized to realize the dynamic thermal comfort textile. Moreover, used polymer materials must exhibit hydrophilic difference to achieve the dynamic thermal properties in fabrics. The inner material of this bicomponent trilobal fiber must be more hydrophilic than the outer material. PA6 and PA6-6 were selected as hydrophilic core and PET hydrophobic outer material for trilobal bicomponent filaments. However, PA6 and PA6-6 are incompatible and immiscible to PET. The major challenge to achieve the desired bicomponent fibers is to acquire a sufficient adhesion at the interface to avoid the pre-splitting or separation between these two polymer materials. In order to improve their miscibility at the interface PA12 was added in PA6 and PA6-6 at 5, 10, 15% wt % via polymer compounding process. In order to produce trilobal bicomponent filament via coextrusion melt spinning process, rheological behavior of the used polymer materials play an important role. To select the most suitable materials for trilobal bicomponent fiber, rheological studies were conducted on pure and polymer blends using capillary rheometer. In addition, hydrophilic properties of each polymer and their blends were also tested on knitted fabrics with contact angle and wicking measurements. To evaluate the effect of PA12 on PET and PA6 interfacial adhesion, bicomponent PET/PA6 sheath/core fibers were produced via melt spinning process and interfacial adhesion was investigated through techniques (tensile test, dynamic mechanical thermal analysis (DMTA), Wide Angle Xray Diffraction (WAXD), Differential scanning calorimetry (DSC), and Scanning Electron Microscope (SEM)). Based on the obtained results from the above mentioned techniques, the most suitable composition was produced in trilobal bicomponent fibers for thermal comfort fabrics. Simulation studies were also performed using Compuplast 3D FEM software to optimize the melt spinning process settings and produce trilobal bicomponent fibers.The textile made out of such innovative bicomponent fibers will show a self-actuation phenomenon are autonomous, self-empowered, and adaptive to the environment. This will help to mitigate the higher energy consumptions by conventional indoor heating, cooling, and ventilation systems and eventually minimizes the global energy consumptions and climate issues
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Backe, Carin. „Enhancing textile electrode performance : Regulating moisture management through textile structure“. Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12389.
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The medical field has been a part of the smart textile area for quite some time. With time come technological advancement and the two fields converge on more and more areas. One such area is that of using textile electrodes, textrodes, for measuring bioelectrical activity, such as heart rate for ECG analysis. There are many components that make for a successful textile electrode and though many studies have been made in the subject there are several aspects that still are difficult. By using textile electrodes the problem with skin irritation from electrolyte gels, commonly used for conventional electrodes, is avoided, however dry textrodes create disturbances in the output signal (heart rate) while subjected to movement and internal dimensional changes. The addition of moisture to a textrode has shown to decrease these intermittent disturbances but the knowledge about fundamental textile structural influence in the matter has not been fully investigated. This study investigates a flat, a 2-thread fleece and an open structure, and their relation to moisture both as textile structures and as textrodes. This way the possibilities of utilising moisture to increase performance in a textrode purpose can be examined and to what extent the textile structure plays a part in that exploitation. The material composition of textile structures also affects their properties The introduction of assistive materials, polyester and viscose, into the Shieldex (conductive yarn) structures is done to test core moisture management properties such as surface tension, absorption and moisture content, and correlate them to electrical properties necessary for textrode function. In the end the gap between textile structure and end product in form of a textrode is closed as the impedance and microclimate of the textrodes are studied. This is mainly to tie together the fundamental textile structures with a complex textile construction. In conclusion the complexity is also confirmed as structural, materialistic and external influences has an impact on the results. The influence of moisture on lowered resistance and impedance in the structures is confirmed but the impact of textile structure can also be seen. The 2-thread fleece and open structures often has a more positive impact on results and therefore has the possibility of enhancing performance of a textrode for bioelectrical signal monitoring. With these results a more effective way of producing long-lasting, patient-friendly, textrodes can be derived and in the future lead to better care in the medical areas.
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Kosturová, Andrea. „Vývoj tepelně izolačních a akusticko izolačních materiálů na bázi druhotných surovin z textilního průmyslu“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392320.
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The objective of the presented diploma thesis is to evaluate the influence of modification on surface layer of products with their base structure from organical fibers and on the ability to resist increased humidity. Emphasis is puted on the description of humidity propagation in fiber materials ant he approximation of secondary waste from the textile industry as a potencional material for thermal insulation. The end of the theoretical part focuses on the types of possible surface treatment to prevent the ingress water into the structure of the material. The practical part verifies the selected type of modification of the surface layer of three materials choosen as test ensemble. After applying surface treatment, the effect of treatment on humidity sensitivity and water absorption was assessed. The determination of the thermal conductivity coefficient, the short-term absorption at partial immersion and the determination of the sorption humidity were made.
Bücher zum Thema "Moisture and thermal regulating textile"
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(Editor), N. Pan, und P. Gibson (Editor), Hrsg. Thermal and moisture transport in fibrous materials (Woodhead Publishing in Textiles). CRC, 2006.
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Ghaddar, Nesreen, und Kamel Ghali. „Modeling of Heat and Moisture Transfer in Porous Textile Medium Subject to External Wind: Improving Clothing Design“. In Handbook of Thermal Science and Engineering, 885–916. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-26695-4_40.
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Ghaddar, Nesreen, und Kamel Ghali. „Modeling of Heat and Moisture Transfer in Porous Textile Medium Subject to External Wind: Improving Clothing Design“. In Handbook of Thermal Science and Engineering, 1–32. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-32003-8_40-2.
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Jones, B., K. Ghali und N. Ghaddar. „Textile–body interactions and modelling issues“. In Thermal and moisture transport in fibrous materials. CRC Press, 2006. http://dx.doi.org/10.1201/9781439824351.ch12.
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Naeem Akhtar, Muhammad, Muhammad Waseem Akhtar, Ashfaq Ahmad Rahi und Tanveer ul Haq. „Enhancing Water Use Efficiency by Using Potassium-Efficient Cotton Cultivars Based on Morphological and Biochemical Characteristic“. In Best Crop Management and Processing Practices for Sustainable Cotton Production [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112606.
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Pakistan’s agriculture sector faces a 50% water shortage, impacting crops like cotton and the textile industry, thus affecting the economy. K-efficient cotton cultivars, which withstand dry conditions through morphological and biochemical traits, can conserve moisture. K-efficient cotton cultivars can be used as donors of key K acquisition traits in breeding programs to develop promising cotton varieties with enhanced yields for the low K environments and can also be recommended for general cultivation to improve cotton production on a sustainable basis. This chapter aims to contribute to enhance water use efficiency (WUE) on the physiological basis to develop strategies for K-efficient cotton cultivars for improvement. Strategies involve regulating transcription factors to improve K-uptake efficiency, increasing root volume through lateral roots and root hairs, and enhancing K-uptake via channels and transporters, ultimately boosting WUE. Molecular breeding programs can leverage K+-associated QTLs to develop high K+ use efficiency cultivars. Physiological processes affecting WUE are discussed alongside factors influencing their contributions, acknowledging the complexity across crops, environments, and nutrients.
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Tsybulskyi, Vitalii. „IMPROVEMENT OF CALCULATION METHOD OF ROAD PAVEMENT EMBANKMENT ON THE APPROACHES TO ROAD BRIDGES“. In Integration of traditional and innovation processes of development of modern science. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-26-021-6-41.
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The laws of unsaturated and capillary movement of water in soils are analyzed, which are complex and insufficiently studied, but significantly affect the condition of the ground. Experience in the design and construction of the subsoil has shown that during the excavation works can significantly change the conditions of soils and their water-thermal regime. Therefore, the characteristics of soils used in stability calculations should be determined taking into account the subsequent condition of the soil in the conditions of occurrence, as well as the possible change of these conditions during construction and maintenance. One of the urgent tasks is to improve the methods of regulating the water-thermal regime of roads. By changing the conditions of its course or the type of water-thermal regime itself, significant successes can be achieved in improving the maintenance of roads, engineering and transport facilities. Dangerous effect of these factors on the embankment of the ground is manifested in the formation of wetting, wetting of the soil and layers of pavement, resulting in reduced density, strength of soils, subsidence, swelling and loss of continuity due to cracking. As a result, the strength of the road structure, the flatness of the carriageway, the durability of the pavement and the adhesion of the wheels to the roadway are reduced. The most dangerous for roads are moisture accumulation, freezing, thawing of the ground, intensive heating and intensive cooling of the layers of pavement. The analysis of regularities of formation of a water-thermal regime of a ground and its regulation at the expense of the device of optimum capillary-interrupting layers is carried out. The laws of soil moisture when raising capillary water showed that when the layer of the embankment with a high coefficient of impregnation is dehydrated over the layer with a lower coefficient, the speed of moving capillary water into the upper soil layers drops sharply. This fall occurs as a result of changes in the relationship between the driving forces of the menisci and the forces of resistance of capillary water in the soil. The process of unsaturated movement of water in the soil is determined by the combination of many factors that characterize the capillary system of the soil. The calculation uses complex indicators of soil water movement conditions, which are established experimentally for each variety and soil density at optimal humidity, as well as water filtration coefficients in the soil. To establish the relationship between these experimental data and the required values that determine the capillary system of the soil, the filtration of water in the soil was considered. Determining the optimal capillary system of the soil and establishing the unstable distribution of own capillary water in the structures of high embankments will ensure the strength of approaches to road bridges. The method of calculating the determination of the optimal composition of the road layers taking into account the processes of water-thermal regime and capillary movement of water has been improved. The algorithm of calculation in the program Microsoft Excel for selection of optimum structure of a ground cloth of a high embankment on approaches to automobile bridges is offered.
Konferenzberichte zum Thema "Moisture and thermal regulating textile"
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Yao, Bao-guo, Li-xia Yan und Yi Li. „Measurement system and precision analysis for thermal regulating properties evaluation of textile materials“. In International Symposium on Precision Engineering Measurement and Instrumentation 2012, herausgegeben von Jie Lin. SPIE, 2013. http://dx.doi.org/10.1117/12.2014827.
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Kai, Xue, Li Jing, Hu Wensheng, Guo Chaofan und Du Pengcheng. „Cause Analysis and Improvement of Drain Regulating Valve Blockage in Nuclear Power Plant“. In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93344.
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Abstract The secondary drain flow regulating valve of the Moisture Separator Reheater System of a nuclear power plant is frequently blocked, which will reduce the efficiency of the recovery and utilization of the drain water generated by the secondary reheater, thus affecting the efficiency of the thermal cycle. By comparing the drain control valves of other systems in the plant and the operation and maintenance of peer power plants, the power plant has determined the reasons for valve blockage: the main component of valve blockage material is Fe3O4, and the main reason for Fe3O4 is the precipitation of iron in the medium after saturation. Based on this, the temporary mitigation measures for on-line flushing are formulated. At the same time, the valve with blockage problem is redesigned and reconstructed, and the structure of the valve cage is improved. The design of the new structure valve cage is not conducive to the accumulation of impurities, and the cleaning of the valve cage is easier. The power plant will use the modified new valve cage in unit 2. After the transformation, the drainage capacity can meet the needs of the unit and the regulation performance is good. After the unit is at full power, it is observed for four months, and it is confirmed that the anti blocking ability meets the requirements.
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Ayadi, Melek, Riadh Zouari, César Ségovia, Ayda Baffoun, Slah Msahli und Nicolas Brosse. „Development of Airlaid Non-Woven Panels for Building’s Thermal Insulation“. In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.772.
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As the need to ensure thermal comfort in buildings is constantly evolving, new technologies continue to emerge with the aim to develop efficient thermal insulation materials. This study aims to explore a textile technology using Airlaid process to develop non-woven fabrics made of natural fibers extracted from Posidonia Oceanica’s waste for assessing their suitability for insulation products in construction field. This technology offers the feature to develop isotropic non-woven structures by orienting randomly the fibers on the fabric surface. The web composed of a mixture of Posidonia Oceanica fibers and a proportion of thermoplastic fibers is then thermally bonded in an oven followed by cooling in order to ensure the solidification of the bonding areas. The prepared panels are then analyzed for the thermal conductivity. It was found that their thermal conductivity is close to commonly used thermal insulation materials, ranging between 0.03515 W/m.K and 0.03957 W/m.K, which allows the non-woven panels to compete with widely-used insulation materials for building’s field. The second part of this work aims to determinate the Posidonia panel's resistance to five common mold types in buildings (Aspergillus niger, Penicilumfuniculosum, Trichoderma viride, Chaetomium globosum, Paecilomycesvariotii). In fact, at high moisture content, molds are likely to develop on cellulosic materials affecting indoor air quality and eventually causing a variety of health risks to occupants. However, optic microscope results showed no growth of molds on the Posidonia samples which allows conceiving reliable thermal insulation materials.
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Lee, Kapo, Joanne Yip und Kit Lun Yick. „Investigating the Factors Affecting the Thermal and Tactile Comfort of Summer Undergarments“. In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001537.
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Hong Kong is often playfully called the “Frozen City” because the air-conditioning in many buildings operates at frigid temperatures during the summer. However, the large temperature differences between the external and internal environments could cause a large array of illnesses, especially children who are not aware of the temperature changes and are less likely to have self-care ability. Therefore, wearing appropriate undergarments or summer underwear could be one of the solutions. However, there are few studies that have investigated the thermal and tactile comfort of summer underwear. In this study, physical experiments, KES-FB measurements, and a wear trial are done to address the lack of studies. Seven conventional types of materials for undergarments are tested. The results indicate that lighter, thinner, and low stitch density fabrics constructed with uniform filaments increase breathability and enhance moisture wicking. Also, uniform fibres increase the thermal conductivity thus enhancing a cooler feeling. In regards tactile comfort, lighter and thinner materials with a higher percentage of elastane, finer yarn, and uniform and long fibres offer a softer, smoother, and cooler hand feel. In addition, the pure cotton material appears to more regulate body temperature as the resultant undergarment facilitates a higher rate of perspiration despite clinging. These results are a good reference for materials scientists, textile researchers as well as academics to further related research work.
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Neves, M. M., J. L. Cunha, P. M. Arezes, C. P. Lea˜o, S. F. C. F. Teixeira, P. Lobarinhas und J. C. Teixeira. „IN2TEC: A Multidisciplinary Research Project Involving Researchers, Students and Industry“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14916.
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Bearing in mind that undergraduate students must get involved in research and that local industry must be a university partner, the School of Engineering, from University of Minho, has taken the initiative in funding some technical research projects in specifically defined areas (http://www.eng.uminho.pt). In this context, one of the projects founded concerns the development and testing of functional knitting which can be used with success in the lining of a shoe. The study of shoe comfort is of great importance to sport and leisure footwear manufactures, because in these particular situations, moisture disposal over a number of hours is a main problem. Three structures which combine different raw materials (soybean fiber, bamboo fiber, corn fiber, cotton, polypropylene and polyester) have been manufactured by a local textile factory. A group of students mainly from Mechanical and Textile Engineering classes are currently testing these knitting in terms of their water vapor and air permeability and other physical parameters at the laboratory. Tests with a thermal manikin have been used to measure its thermal insulation. A transient model for heat and mass transfer in a fabric has been implemented. From the solution, temperature and vapor density profiles in the fabric thickness can be obtained as well as, the amount of water dissolved in the fabric. This model has been integrated with an existing human thermal comfort model. Thermal comfort surveys are now being made at the Ergonomics Laboratory of the University of Minho with undergraduate Mechanical and Industrial Engineering students, wearing sport shoes manufactured by a local footwear factory, and these results can be compared using statistical analysis, with the experimental and numerical results already obtained.
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Secan, Cristina, und Sunhilde Cuc. „Aspects Regarding the Physiological and Comfort Parameters in Shoes Made of Leather Substitutes“. In The 9th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2022. http://dx.doi.org/10.24264/icams-2022.iv.13.
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The issue of replacing natural leather with leather substitutes is increasingly common in the leather goods industry. In this paper, it was addressed the issue of ensuring the physiological and comfort parameters when wearing leather substitute shoes. The aim of the paper is to analyze how the sanogenetic indicators influence the hygienic properties of footwear products starting from the porosity of the materials subjected to experimental determinations. Poromeric skin substitutes will be used, which allow the passage of water vapor and air. Both types of leather substitutes for shoe uppers and some types of textile materials for linings will be subjected to laboratory analysis, using the pycnometric method. In conclusion, the values obtained for porosity fall between 47 and 58%, limits also provided by the specialized literature. It is noted that the porosity values of leather substitutes are close to those of chrome-tanned leather, so as a result, the value of leather substitutes use will increase (they have sanogenetic properties similar to natural leather). Currently, leather substitutes are used more and more in the manufacture of footwear products, because they maintain a thermal transfer balance between the foot and the surrounding environment, favoring the elimination of moisture produced by the foot when wearing the footwear in the outdoor environment.