Towards Optimizing a Personal Cooling Garment for Hot and Humid Deep Mining Conditions

Sayed, Chady Al; Vinches, Ludwig; Hallé, Stéphane

doi:10.4236/ojop.2016.51005

Cited by 18 publications

(29 citation statements)

References 34 publications

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“…These conditions can increase the risk of work accidents and even lead to death. Personal cooling garments can be worn [2] for minimizing heat stress, especially in places where effective air conditioning is not provided. A valid number of researchers have concluded that by controlling the cooling load of these garments, this would improve their efficiency and increase their autonomy [3] [4].…”

Section: Introductionmentioning

confidence: 99%

Validation of a Wearable Biometric System’s Ability to Monitor Heart Rate in Two Different Climate Conditions under Variable Physical Activities

Sayed¹,

Vinches²,

Hallé³

2017

ETSN

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Research has proven the importance of cooling garments in reducing heat stress, especially for workers in extreme environments. The currently available cooling capacity of these garments should be controlled for improving their efficiency and autonomy. In this study, we investigated the Hexoskin wearable biometric shirt's capacity to monitor heart rate. Twelve male volunteers wore a Hexoskin biometric shirt and Polar® H7 heart rate sensor and they completed two identical tests under two different climate conditions (25˚C ± 0.5˚C; 39% ± 1% relative humidity and 31˚C ± 0.5˚C; 60% ± 1% relative humidity). The results from four different statistical methods show a high correlation and an absence of significant differences between the Polar® and Hexoskin systems in monitoring the subjects' heart rates. The Hexoskin wearable biometric shirt can be used to monitor the heart rate of humans in moderate or hot and humid climates under variable physical activities, regardless of their age, weight or height.

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Section: Introductionmentioning

confidence: 99%

Validation of a Wearable Biometric System’s Ability to Monitor Heart Rate in Two Different Climate Conditions under Variable Physical Activities

Sayed¹,

Vinches²,

Hallé³

2017

ETSN

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“…Currently existing cooling vests are not appropriate for use in deep mining conditions [17]. While the safety, efficiency and autonomy of the apparel will be more centric to the designers, comfort and ease of movement will be a top priority to convince miners to try out the cooling vest.…”

Section: Discussionmentioning

confidence: 99%

“…Several types of cooling vests exist on the market [13][14][15][16], such as, air cooling garments, liquid cooling garments, cooling garments based on gas expansion, phase changing garments and thermoelectric cooling. In their work, Al Sayed et al [17] list the many issues that may arise when using an ordinary cooling vest in deep underground mines, such as reduced cooling efficiency, risk of condensation on the interior of the vest, bulkiness of the apparel and low autonomy [17]. They conclude that no cooling technology is perfectly compatible with deep mining environments.…”

Section: Introductionmentioning

confidence: 99%

Ergonomic design of a cooling vest in deep and ultra-deep mining environments

Ngô¹,

Nadeau²,

Hallé³

2018

OER

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Abstract. BACKGROUND: Ever deeper mining is exposing workers to increasing heat and humidity, which can threaten their health and safety. OBJECTIVE: The objective of this research is to create a matrix of criteria that will eventually be used to design a personal cooling vest that will meet the needs and wants of miners. METHODS: A literature review was done to identify the constraints and requirements of miners in ultra-deep mining conditions; a field study was conducted in which information was acquired by measurement (temperature, humidity), observation (work rate) and semi-directed interviews of a convenience sample, 20 volunteer participants (age, weight, height, shirt size, personal protective equipment currently worn and opinion about a cooling vest). The data was then structured, compiled and interpreted to create a matrix. RESULTS: Participants were found to be in the > 50% percentile of the population regarding weight and height. All reacted positively to the idea of a cooling vest to help in their work. A matrix containing nine users and seven design-related criteria was created. CONCLUSIONS:The matrix must still be tested as to its validity. Its usage could then be extended to other fields of work in which heat is a health and safety concern for workers.

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“…Thus, the small cooling capacity and the reduced cooling effect of this approach can be sufficient for shallow mines, but it generally fails to meet the growing cooling requirements of deeper ones. The second category covers the artificial cooling technologies based on the advanced refrigeration principles, which solve the increasingly severe problem of thermal damage by using or combining centralized air conditioning, air pressurization, ice cooling, thermo-electric cooling with ethylene glycol, and high-temperature exchange machinery systems (HEMSs) [31][32][33][34][35][36][37]. The latter category of technologies have significantly reduced the high-temperature-induced thermal damage in some particular deep mines and resolved their cooling problems.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Set of Cooling Measures for the Overall Control and Reduction of High Temperature-Induced Thermal Damage in Oversize Deep Mines: A Case Study

et al. 2020

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The mining process in deep mines occurs at elevated temperatures and thus is significantly jeopardized by the thermal damage. In this study, the main factors causing high-temperatures under particular mining geological and prevailing conditions of coal mine production, namely for the Longgu Coal Mine (LCM) in Shandong Province of China, were specified and analyzed in detail. This included exothermic heat from the surrounding rock of an underground roadway, inflow of high-temperature water, seasonal temperature rise, mechanical and electrical equipment operation, and airflow compression in the mine. The integrated artificial cooling mode was implemented on the basis of the original normal ventilation and cooling facilities of the LCM, which involved cooling by mobile refrigeration units, water source heat pump refrigeration units, and a ground centralized ice-cooling radiation system, as well as the underground centralized cooling system provided by Wärme-Austausch-Technik (WAT) GmbH. Eventually, a comprehensive set of measures for the overall control and reduction of high-temperature-induced damage was realized, which ensured more effective cooling of the LCM. Thus, the average temperature of the main operation sites was reduced by 8 K, while that of the underground working faces was maintained at 299.15 K. These measures also resulted in excellent technical and economic benefits: the total three-year increase in revenue and savings reached 76.3 million USD, hence relevant findings of the study are expected to provide technical guidance on the treatment of high-temperature-induced damage in deep mines.

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Towards Optimizing a Personal Cooling Garment for Hot and Humid Deep Mining Conditions

Cited by 18 publications

References 34 publications

Validation of a Wearable Biometric System’s Ability to Monitor Heart Rate in Two Different Climate Conditions under Variable Physical Activities

Validation of a Wearable Biometric System’s Ability to Monitor Heart Rate in Two Different Climate Conditions under Variable Physical Activities

Ergonomic design of a cooling vest in deep and ultra-deep mining environments

A Comprehensive Set of Cooling Measures for the Overall Control and Reduction of High Temperature-Induced Thermal Damage in Oversize Deep Mines: A Case Study

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