Fundamental study of ventilation in air layer in clothing considering real shape of the human body based on CFD analysis

Takada, Satoru; Sasaki, Ayaha; Kimura, Risa

doi:10.1016/j.buildenv.2016.01.028

Cited by 29 publications

(15 citation statements)

References 29 publications

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“…Our study showed that the thermal stability of Kevlar/PBI was superior to Nomex IIIA, which was in accordance with the literature. Fiber type and fabric structure are two factors influencing the thermal shrinkage of the fire-retardant fabrics [25]. The internal stresses resulted from the spinning and drawing processing during the fiber formation process tend to relax, and the macromolecule chains tend to retract from extended conformation to random coil when the fabric exposed to heat source, which led to shrinkage in the length direction of the fiber [27,45].…”

Section: Discussionmentioning

confidence: 99%

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Investigating the Thermal-Protective Performance of Fire-Retardant Fabrics Considering Garment Aperture Structures Exposed to Flames

et al. 2020

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The application of fire-retardant fabrics is essential for providing thermal protective function of the garments. Appropriate clothing design are beneficial for preventing the wearers from skin burn injuries and heat strains simultaneously. The intention of this work was to investigate the effects of clothing ventilation designs on its thermal protective performance by bench-scale tests. Four boundary conditions were designed to simulate the garment aperture structures on fabric level. Tests of thermal shrinkage, mass loss and time-to-second-degree-burns were performed with and without air gap under three heat-flux levels for two kinds of inherently fire-retardant fabrics. The impacts of fabric type, heat-flux level, air gap and boundary condition were analyzed. The presence of a 6.4-mm air gap could improve thermal protective performance of the fabrics, however, the garment openings would decrease this positive effects. More severe thermal aging found for spaced test configuration indicated the importance of balancing the service life and thermal protective performance of the clothing. The findings of this study implied that the characteristics of fabric type, air gap, boundary condition, and their effects on fabric thermal aging should be considered during clothing ventilation designs, to balance the thermal protection and comfort of the protective gear.

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Section: Discussionmentioning

confidence: 99%

“…Previous studies also focused on the distribution and heat-transfer mechanism of air gap [ 8 , 23 , 24 , 25 ]. With the increase of exposure duration and intensity, degradative losses in thickness and mass of the fabrics occurred and the thermal shrinkage was observed for aramid fabrics [ 7 , 10 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Thermal-Protective Performance of Fire-Retardant Fabrics Considering Garment Aperture Structures Exposed to Flames

et al. 2020

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“…The human occupant is modeled as a volume heat source of 103 W 19 . The occupant is set to have 1.0 clo and 0.6 clo clothing insulation in the cold weather and warm weather case respectively 38,39 . The wall temperature is set as a constant value during the simulation to capture its large thermal mass and typical observed behavior in commercial buildings.…”

Section: Low Emissivity High-reflectivity Interior Surfaces During Cmentioning

confidence: 99%

Tuning radiative heat flows between interior surfaces and human occupants to improve heating and cooling efficiency

Jin¹,

Raman²

2020

Preprint

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Space heating and cooling in buildings account for nearly 20% of energy use globally. In most buildings this energy is used to maintain the thermal comfort of the building’s human occupants by maintaining the interior air temperature at a particular set point. However, if one could maintain the human occupant’s thermal comfort while decreasing the heating or increasing the cooling set point, dramatic energy savings are possible. Here, we propose and evaluate an untapped degree of freedom in improving building efficiency: dynamically tuning the thermal emissivity of interior building surfaces at long-wave infrared wavelengths to maintain thermal comfort. We show that in cold weather conditions tuning the emissivity of interior walls, floors and ceilings to a low value (0.1) can decrease the set point temperature as much as 7°C, corresponding to an energy saving of nearly 67.7% relative to high emissivity materials (0.9). Conversely, in warm weather, high emissivity interior surfaces result in a 38.5% energy savings relative to low emissivity surfaces, highlighting the need for tunability for maximal year-round efficiency. Our results reveal the remarkable energy savings potential possible by better controlling the ubiquitous flows of heat that surround us in the form of thermal radiation.

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“…Sobre o conforto térmico, abrangem o conforto ao ambiente e se utilizam de manequins com sensores térmicos e câmeras climáticas para testes como os estudos de TIAN et al [14] e TAKADA et al [15].…”

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A eficácia de produtos hidrofóbicos aplicados em tecidos 90% poliéster 10% elastano estampados

Lorscheiter¹,

Folle²

2017

Matéria (Rio J.)

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RESUMOOs avanços industriais para o setor de vestuário, ligam os desejos e as necessidades dos usuários a soluções relacionadas a aspectos da moda, da tecnologia e do conforto dos tecidos. Com o objetivo de contribuir para o desenvolvimento de processos de inovação por meio do design, o presente estudo analisa a eficácia de dois produtos hidrofóbicos de empresas do Rio Grande do Sul, o produto 1495 da Claritex e o produto 1003 da Corium. Estes produtos foram aplicados nos tecidos Dress e Sublime, ambos com 90% poliéster 10% elastano e estampados por sublimação, da empresa têxtil Santaconstancia, São Paulo. Busca-se avaliar se os tecidos perdem as propriedades hidrofóbicas após várias lavagens e se mantêm sua permeabilidade ao vapor de água, a qual contribui ao conforto térmico. Foram analisados, o processo de lavagem doméstica, os ensaios de permeabilidade ao vapor de água e o ângulo de contato da gota. Os resultados mostraram que os dois produtos hidrofóbicos analisados são eficazes, mas o produto 1003 obteve a maior média do ângulo de contato da gota após 20 lavagens. Outro resultado obtido foi que os tecidos analisados não sofreram mudanças significativas nos valores de permeabilidade ao vapor de água quando comparados aos tecidos crus, sem aplicação de estampa e sem o produto hidrofóbico. Palavras-chave:Tecnologia Aplicada ao Design. Têxtil. Hidrofóbico. Pesquisa em Design. Conforto Térmi-co. ABSTRACTIndustrial breakthroughs for the clothing sector connect the consumers' desires and needs to solutions related to fashion and technology aspects, and the comfort of the fabrics. In order to contribute to the development of innovation processes through design, this study examines the effectiveness of two hydrophobic products from Rio Grande do Sul companies: the product 1495, from Claritex, and the product 1003 from Corium. These products were applied to the fabrics Dress and Sublime, both with 90% polyester, and 10% elastane, and printed by sublimation, from the textile company Santaconstancia. The objective is to evaluate if the fabrics lose their hydrophobic properties after multiple washings, and if they maintain their permeability to water steam, which contributes to thermal comfort. It was analyzed assays with resistance to domestic laundering, the water steam permeability and the contact angle from the drop of water. The results showed that both hydrophobic products analyzed are effective, but the product 1003 had the highest average of contact angle from the drop of water after 20 washes. Another result is that the fabrics analyzed haven't suffered significant changes in the permeability to the water steam values when they compared to fabrics without application of print and the hydrophobic product.

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Fundamental study of ventilation in air layer in clothing considering real shape of the human body based on CFD analysis

Cited by 29 publications

References 29 publications

Investigating the Thermal-Protective Performance of Fire-Retardant Fabrics Considering Garment Aperture Structures Exposed to Flames

Investigating the Thermal-Protective Performance of Fire-Retardant Fabrics Considering Garment Aperture Structures Exposed to Flames

Tuning radiative heat flows between interior surfaces and human occupants to improve heating and cooling efficiency

A eficácia de produtos hidrofóbicos aplicados em tecidos 90% poliéster 10% elastano estampados

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