Modeling the performance of a PCM cooling vest considering its side effects

Yazdi, Motahareh Mokhtari; Sheikhzadeh, Mohammad; Chavoshi, Seyed Ehsan

doi:10.1108/ijcst-01-2014-0018

Cited by 15 publications

(8 citation statements)

References 27 publications

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“…Modeling the use of the cooling garment on the body is a method by which we can study the heat exchange between the cooling garment and the body as well as the surrounding environment. The authors of the present paper have already conducted relevant and appropriate evaluation of the effects of the cooling garment on the body and heat exchange of a system having the three parts of body, cooling garment, and the environment using software simulation [21,22]. So, it has been attempted in this study to investigate the efficiency of the cooling garment as a function of its ability to absorb the body's heat.…”

Section: Introductionmentioning

confidence: 99%

Modeling the efficiency and heat gain of a phase change material cooling vest: The effect of ambient temperature and outer isolation

Yazdi

Sheikhzadeh

Dabirzadeh

et al. 2015

Journal of Industrial Textiles

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Cooling garments containing phase change materials are one of the practical techniques used for improving thermal comfort and worker's performance in hot environments and under protective clothing. Such garments absorb the body's excessive heat and help the body reach thermal comfort situation by reducing the heat content of the body. The amount of heat absorbed by the phase change materials and the efficiency of the cooling garment can be affected by several parameters. This study uses a software modeling to investigate the effect of different factors such as ambient temperature, the use of protective clothing over the cooling garment, and the type of phase change material bags coating on the efficiency of the cooling garment. The results showed that temperature of the environment in which the cooling garment is used could largely affect the cooling efficiency of such garments. Increasing the ambient temperature from 30 to 40 C can reduce the cooling efficiency of the garment up to 70%. Also, the use of cooling garment under protective clothing was simulated in this paper as a practical way to improve the thermal situation of the body. It was also shown that insulating the outer surfaces of phase change material bags against the surrounding environment could enhance the cooling power of the garment by 20 to 34% depending on the type of the coverings.

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Section: Introductionmentioning

confidence: 99%

Modeling the efficiency and heat gain of a phase change material cooling vest: The effect of ambient temperature and outer isolation

Yazdi

Sheikhzadeh

Dabirzadeh

et al. 2015

Journal of Industrial Textiles

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“…Moderate increase in weight of CPC over a short period of time would have intensified the cardiovascular strain, but had less impact on core temperature and mean skin temperature. YAZDI et al [44] showed that an increase in the weight of CPC caused an increase in metabolism. DORMAN et al [4] developed a slope regression line based on human experiments, showing a 2.7% increase in metabolic rate for each additional kilogram of clothing weight.…”

Section: Discussionmentioning

confidence: 99%

Heat strain in chemical protective clothing in hot-humid environment: Effects of clothing thermal properties

Zhang¹,

Chen

Liang³

et al. 2021

J. Cent. South Univ.

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Heat strain experienced by individuals wearing chemical protective clothing (CPC) is severe and dangerous especially in hot-humid environment. The development of material science and interdisciplinary studies including ergonomics, physiology and heat transfer is urgently required for the reduction of heat strain. The aim of this paper was to study the relationship among clothing thermal properties, physiological responses and environmental conditions. Three kinds of CPC were selected. Eight participants wore CPC and walked (4 km/h, two slopes with 5% and 10%) on a treadmill in an environment with (35±0.5) °C and RH of (60±5)%. Core temperature, mean skin temperature, heart rate, heat storage and tolerance time were recorded and analyzed. Physiological responses were significantly affected by the clothing thermal properties and activity intensity in hot-humid environment. The obtained results can help further development of heat strain model. New materials with lower evaporative resistance and less weight are necessary to release the heat strain in hot-humid environments.

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“…Furthermore, although IZI and SMART vests provided lower Re (%), their C values were also significantly lower compared to other tested evaporative vests. The vests with PCM inserts also reduced the evaporative capacity of the observed system, presumably due to reduced breathability of the materials (Mokhtari Yazdi et al 2015), with findings suggesting their efficiency would be greater compared to others in humid environments, where evaporative cooling is reduced or when wearing the vests underneath unbreathable protective clothing (Maley et al 2020).…”

Section: Thermal Resistance (Rt) and Relative Evaporative Resistance mentioning

confidence: 95%

Cooling efficiency of vests with different cooling concepts over 8-hour trials

2020

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As frequency and severity of heat waves are increasing, personal cooling systems are being considered as a tool to mitigate heat strain in workers in various occupational settings. The present study assessed cooling capacities (C; W•h•m-2) of various commercially available vests using different cooling concepts. Measurements were conducted over 8 h in a climatic chamber (Ta: 35 ˚C, RH: 35 %) using a thermal manikin (Ts: 35 ˚C). Cooling power (P) and duration of efficient cooling (t c) determined the C value of each vest. Among the cooling concepts the active cooling vests were the most efficient, extracting 331 W•h•m-2 , followed by the vests with phase change material (PCM) inserts, hybrid and evaporative vests, extracting a maximum of 164 W•h•m-2 , 146 W•h•m-2 and 113 W•h•m-2 , respectively. While some vests with PCM inserts provided intense but shorter cooling, evaporative vests provided mild but longer cooling throughout.

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Modeling the performance of a PCM cooling vest considering its side effects

Cited by 15 publications

References 27 publications

Modeling the efficiency and heat gain of a phase change material cooling vest: The effect of ambient temperature and outer isolation

Modeling the efficiency and heat gain of a phase change material cooling vest: The effect of ambient temperature and outer isolation

Heat strain in chemical protective clothing in hot-humid environment: Effects of clothing thermal properties

Cooling efficiency of vests with different cooling concepts over 8-hour trials

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