Effect of thermal manikin surface temperature on the performance of personal cooling systems

Jetté, François‐Xavier; Dionne, J-P; Rose, John; Makris, Andreas

doi:10.1007/s00421-004-1112-7

Cited by 18 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These are the areas where main arteries that run close to the skin surface are located: armpits (axillary arteries), neck (carotid artery), and groin (iliac arteries). Previous cooling systems designed using this hypothesis include neck scarves through which cold water is pumped [Bouskill and Parsons, 1996], and a liquid cooled vest [Jette et al, 2004]. However, such an approach must be employed with caution because direct cooling of the blood entering the brain could theoretically reduce the physiological stimulus for reflex heat loss mechanisms such as sweating and skin blood flow.…”

Section: Body Coolingmentioning

confidence: 99%

Heat exposure in the Canadian workplace

Jay

Kenny

2010

American J Industrial Med

View full text Add to dashboard Cite

Exposure to excessive heat is a physical hazard that threatens Canadian workers. As patterns of global climate change suggest an increased frequency of heat waves, the potential impact of these extreme climate events on the health and well-being of the Canadian workforce is a new and growing challenge. Increasingly, industries rely on available technology and information to ensure the safety of their workers. Current Canadian labor codes in all provinces employ the guidelines recommended by the American Conference of Governmental Industrial Hygienists (ACGIH) that are Threshold Limit Values (TLVs) based upon Wet Bulb Globe Temperature (WBGT). The TLVs are set so that core body temperature of the workers supposedly does not exceed 38.0 degrees C. Legislation in most Canadian provinces also requires employers to install engineering and administrative controls to reduce the heat stress risk of their working environment should it exceed the levels permissible under the WBGT system. There are however severe limitations using the WGBT system because it only directly evaluates the environmental parameters and merely incorporates personal factors such as clothing insulation and metabolic heat production through simple correction factors for broadly generalized groups. An improved awareness of the strengths and limitations of TLVs and the WGBT index can minimize preventable measurement errors and improve their utilization in workplaces. Work is on-going, particularly in the European Union to develop an improved individualized heat stress risk assessment tool. More work is required to improve the predictive capacity of these indices.

show abstract

Section: Body Coolingmentioning

confidence: 99%

Heat exposure in the Canadian workplace

Jay

Kenny

2010

American J Industrial Med

View full text Add to dashboard Cite

show abstract

“…Active cooling systems include external connections to air or liquid supplies such as ventilated cooled air cooling (Kuklane et al 2000;Pimental et al 1987;Shapiro et al 1982), and circulated liquid cooling (Jetté et al 2004;Pimental et al 1988;Shapiro et al 1982). A battery driven ambient air fan based cooling vest without external connections has also been studied (Hadid et al 2008;Shapiro et al 1982).…”

Section: Introductionmentioning

confidence: 98%

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

2010

View full text Add to dashboard Cite

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.

show abstract

“…One of the strategies for decrease of the heat strain in hot environments is the use of personal cooling vests [8]. These vests absorb the excess heat and create a thermal comfort in hot environments [9]. Cooling vests of the phase-changing material (PCM) are one of the well-known personal cooling equipment.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Impact of an Optimized Ice Cooling Vest and a Paraffin Cooling Vest on Physiological and Perceptual Strain

zare

Dehghan

Yazdanirad

et al. 2019

Safety and Health at Work

View full text Add to dashboard Cite

Background Ice cooling vests can cause tissue damage and have no flexibility. Therefore, these two undesirable properties of ice cooling vest were optimized, and the present study was aimed to compare the impact of the optimized ice cooling vest and a commercial paraffin cooling vest on physiological and perceptual strain under controlled conditions. Methods For optimizing, hydrogel was used to increase the flexibility and a layer of the ethylene vinyl acetate foam was placed into the inside layer of packs to prevent tissue damage. Then, 15 men with an optimized ice cooling vest, with a commercial paraffin cooling vest, and without a cooling vest performed tests including exercise on a treadmill (speed of 2.8 km/hr and slope of %0) under hot (40 ° C) and dry (40 %) condition for 60 min. The physiological strain index and skin temperature were measured every 5 and 15 minutes, respectively. The heat strain score index and perceptual strain index were also assessed every 15 minutes. Results The mean values of the physiological and perceptual indices differed significantly between exercise with and without cooling vests (P < 0.05). However, the difference of the mean values of the indices except the value of the skin temperature during the exercises with the commercial paraffin cooling vest and the optimized ice cooling vest was not significant (P > 0.05). Conclusions The optimized ice cooling vest was as effective as the commercial paraffin cooling vest to control the thermal strain. However, ice has a greater latent heat and less production cost.

show abstract

Effect of thermal manikin surface temperature on the performance of personal cooling systems

Cited by 18 publications

References 0 publications

Heat exposure in the Canadian workplace

Heat exposure in the Canadian workplace

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

Comparison of the Impact of an Optimized Ice Cooling Vest and a Paraffin Cooling Vest on Physiological and Perceptual Strain

Contact Info

Product

Resources

About