Cooling vests with phase change materials: the effects of melting temperature on heat strain alleviation in an extremely hot environment

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Cooling vests with phase change materials: the effects of melting temperature on heat strain alleviation in an extremely hot environment. / Gao, Chuansi; Kuklane, Kalev; Holmér, Ingvar.

I: European Journal of Applied Physiology, Vol. 111, Nr. 6, 2011, s. 1207-1216.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Cooling vests with phase change materials: the effects of melting temperature on heat strain alleviation in an extremely hot environment

AU - Gao, Chuansi

AU - Kuklane, Kalev

AU - Holmér, Ingvar

PY - 2011

Y1 - 2011

N2 - A previous study by the authors using a heated thermal manikin showed that the cooling rates of phase change material (PCM) are dependent on temperature gradient, mass, and covering area. The objective of this study was to investigate if the cooling effects of the temperature gradient observed on a thermal manikin could be validated on human subjects in extreme heat. The subjects wore cooling vests with PCMs at two melting temperatures (24 and 28°C) and fire-fighting clothing and equipment, thus forming three test groups (vest24, vest28 and control group without the vest). They walked on a treadmill at a speed of 5 km/h in a climatic chamber (air temperature = 55°C, relative humidity = 30%, vapour pressure = 4,725 Pa, and air velocity = 0.4 m/s). The results showed that the PCM vest with a lower melting temperature (24°C) has a stronger cooling effect on the torso and mean skin temperatures than that with a higher melting temperature (28°C). Both PCM vests mitigate peak core temperature increase during the resting recovery period. The two PCM vests tested, however, had no significant effect on the alleviation of core temperature increase during exercise in the heat. To study the possibility of effective cooling of core temperature, cooling garments with PCMs at even lower melting temperatures (e.g. 15°C) and a larger covering area should be investigated.

AB - A previous study by the authors using a heated thermal manikin showed that the cooling rates of phase change material (PCM) are dependent on temperature gradient, mass, and covering area. The objective of this study was to investigate if the cooling effects of the temperature gradient observed on a thermal manikin could be validated on human subjects in extreme heat. The subjects wore cooling vests with PCMs at two melting temperatures (24 and 28°C) and fire-fighting clothing and equipment, thus forming three test groups (vest24, vest28 and control group without the vest). They walked on a treadmill at a speed of 5 km/h in a climatic chamber (air temperature = 55°C, relative humidity = 30%, vapour pressure = 4,725 Pa, and air velocity = 0.4 m/s). The results showed that the PCM vest with a lower melting temperature (24°C) has a stronger cooling effect on the torso and mean skin temperatures than that with a higher melting temperature (28°C). Both PCM vests mitigate peak core temperature increase during the resting recovery period. The two PCM vests tested, however, had no significant effect on the alleviation of core temperature increase during exercise in the heat. To study the possibility of effective cooling of core temperature, cooling garments with PCMs at even lower melting temperatures (e.g. 15°C) and a larger covering area should be investigated.

KW - Extremely hot environment - Phase change material (PCM) - Melting temperature - Cooling vest - Heat strain

U2 - 10.1007/s00421-010-1748-4

DO - 10.1007/s00421-010-1748-4

M3 - Article

VL - 111

SP - 1207

EP - 1216

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 0365-0863

IS - 6

ER -