Quantitative assessment of the thermal stored energy in protective clothing under low-level radiant heat exposure

He, Jiazhen; Chen, Yan; Wang, Lichuan; Li, Jun

doi:10.1177/0040517517732084

Cited by 8 publications

(13 citation statements)

References 32 publications

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“…The air permeability of the fabric was measured under a pressure drop of 100 Pa using a Frazier Air Permeability Tester, according to ISO 9237. Fabric specific heat was supported by the measurement of He et al 8…”

Section: Methodsmentioning

confidence: 94%

“…A large amount of heat storage in the OS layer was due to the direct heat exchange with the environment and the large specific heat capacity. 22 A large amount of heat storage in the TL layer was due to its weight and thickness, 8 especially as the thickness of the TL layer was four times that of the OS layer, as shown in Table 1. However, the heat storage in the TL layer at the calf part of the clothing was slightly higher than that in the OS layer at 5%.…”

Section: Effect Of Ambient Temperature Step Magnitude On Heat Storagementioning

confidence: 99%

“…7 The more thermal energy is stored in clothing and the longer the heat storage time is, the fewer and slower the heat transfer to the human body. 8 Therefore, it is fundamental to study the effect of ambient temperature steps on clothing heat storage and release to improve the design of clothing thermal management and human thermal comfort.…”

mentioning

confidence: 99%

“…Furthermore, the temperature changes of the clothing microclimate or skin were usually used to evaluate the thermal properties of clothing, 17,20 but these indices did not directly quantify the clothing heat storage and release. He et al 8 proposed a quantitative assessment of the thermal stored energy in fabric systems to discuss the effects of material properties. 21,22 The influence of the fabric system weight and thickness were investigated, but the contributions of multi-factors on the heat storage were not analyzed.…”

mentioning

confidence: 99%

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Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

Huang

Deng

2022

Textile Research Journal

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Ambient temperature steps between typical non-work and hot work environments will lead to clothing heat storage and release, which is crucial for human health and thermal comfort. In this study, the influence of five types of ambient temperature steps (from 0ºC/5ºC/10ºC/15ºC/20ºC to 40ºC to 0ºC/5ºC/10ºC/15ºC/20ºC) on the heat storage and release in clothing was investigated using a thermal manikin. A moving and temperature-controlled refrigerated incubator was constructed to realize the temperature step conditions. Results showed that ambient temperature step magnitude was positively related to heat storage and release. Some 80% of the amount of heat storage would be completed in around 10 min after the temperature steps. Increasing the inner clothing layer weight and specific heat capacity for local clothing at the chest, thigh and calf improved their heat storage against the large temperature step conditions. As for the abdomen, its heat storage was the largest. However, the clothing layer configuration impacted its heat release, so it was necessary to guide the heat transfer to the skin. The heat storage in the outer layer was increased by 2% to 39% due to adding the inner layer of the garment. The stored heat discharged completely until the temperature step magnitude exceeded 32.5°C. A multiple linear regression formula was proposed to obtain the clothing average heat storage by considering ambient temperature step magnitude and clothing insulation. The results of this study could contribute to the optimization of thermal protective clothing and improvement of the research on human thermal comfort.

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Section: Methodsmentioning

confidence: 94%

Section: Effect Of Ambient Temperature Step Magnitude On Heat Storagementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

Huang

Deng

2022

Textile Research Journal

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“…With the increase of air gap thickness, fabric storage heat increased, but the storage heat of the fabric is limited, and the temperature will no longer rise when it reaches the critical value. 30 It can be inferred through the surface temperature and the change of physical properties that the critical value will be different in the open and sealed states of the air gap, but it is roughly in the range of a 12-18 mm air gap.…”

Section: Temperature Evolution Of the Fabricmentioning

confidence: 99%

Thermal degradation behavior of flame-resistant fabrics exposed to fires: effect of air gap type and thickness

Zhang

Tian

Wang

et al. 2022

Textile Research Journal

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The thermal degradation of flame-resistant fabrics reduces the protective ability of clothing and affects firefighters’ safety. Making clear the influence factors of fabric thermal degradation is important for predicting and prolonging the service life of fire-protection clothing. Experiments were conducted for open and sealed air gaps with different thicknesses under flame exposure. The degradation the of outer shell fabric was evaluated by observing the variation in fabric morphology, mass loss and tensile strength of specimens after heat exposure. The influence mechanism of the type and thickness of the air gap on thermal degradation was analyzed by the surface temperature curve and thermal stability of the fabric, as well as the microstructure of the fiber. The results indicated that the type and thickness of the air gap have a significant effect on thermal degradation, and a more serious negative effect was observed under the condition of an open air gap. After being exposed to heat fluxes of 30 and 50 kW/m2 for 40 s, the mass loss rates were 1.8% and 3.3% higher than those of the sealed air gap, and the tensile strength retention rates were 9.1% and 10.1% lower on average, respectively. Air gap type and thickness affected the heat storage and heat transfer efficiency in the fabric system by changing the heat transfer mode. The decomposition and fracture of the fabric were affected, which made the flame-resistant fabrics show different degrees of thermal degradation.

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Quantification of the energy storage caused dual performance of thermal protective clothing containing with moisture exposed to hot steam

Yang

2019

Energy Science & Engineering

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Except for providing thermal protection, thermal protective clothing (TPC) may also impose thermal hazards on human skin due to the discharge of energy storage. The dual thermal protective/thermal hazardous performance of TPC is rather complicated when TPC gets wet from internal and external sources and especially when it is exposed to conditions of pressurized hot steam. In this study, several indices were used to quantitatively investigate the influences of moisture location, moisture content within TPC, and their combined effect on the energy storage caused dual performance of TPC under exposure to steam. Results showed that both the increasing of external and internal moisture could decrease heat absorption of the skin and increase burn injury time under steam exposure through heat storage, but the positive effect of the external moisture amount was more obvious. The external moisture amount had no significant effect on heat discharge from TPC to the skin, whereas the internal moisture amount increased heat discharge. Empirical models were successfully established to predict the energy absorption of human skin and the burn injury time. Research outcomes of this study will contribute to thoroughly understanding the impact of moisture on dual performance under steam exposure and provide new insights into the development of functional textile materials.

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Quantitative assessment of the thermal stored energy in protective clothing under low-level radiant heat exposure

Cited by 8 publications

References 32 publications

Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

Thermal degradation behavior of flame-resistant fabrics exposed to fires: effect of air gap type and thickness

Quantification of the energy storage caused dual performance of thermal protective clothing containing with moisture exposed to hot steam

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