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

Open Journal of Optimization 2016年第1期5卷 35-43页

作者： Chady Al sayed ludwig vinches.s.éphane hallé Department of Mechanical Engineering école de Technologie Supérieure Montréal Canada

Workers exposed to hot and humid conditions suffer from heat stress that affects their concentration and can potentially lead to an increase in workplace accidents. To minimize heat stress, protective equipment may be worn, such as personal cooling garments. This paper presents and discusses the performances, advantages and disadvantages of existing personal cooling garments, namely air-cooled, liquid-cooled, phase change, hybrid, gas expansion and vacuum desiccant cooling garments, and a thermoelectric cooling technology. The main objective is to identify the cooling technique that would be most suitable for deep mining workers. It appears that no cooling technology currently on the market is perfectly compatible with this type of mining environment. However, combining two or more cooling technologies into a single hybrid system could be the solution to an optimized cooling garment for deep mines.

关键词： Personal Cooling Garment Heat stress Thermal Efficiency Deep Mines

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

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E-Health Telecommunication systems and Networks 2017年第2期6卷 19-30页

作者： Chady Al sayed ludwig vinches.s.éphane hallé Department of Mechanical Engineering école de Technologie Supérieure Montreal Canada

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.

关键词： Hexoskin Biometric system Heart Rate Hot and Humid Environments Physical Activity

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Experimental Investigation of the Cooling Capacity of Gaseous Carbon Dioxide in Free Jet Expansion for Use in Portable Air-Cooling systems

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Open Journal of Applied sciences 2018年第2期8卷 62-72页

作者： Chady Al sayed ludwig vinches.s.éphane hallé Department of Mechanical Engineering école de Technologie Supérieure Montreal Canada

This paper investigates the possibility of using the free expansion of gaseous CO2 in portable air-cooling systems. The cooling capacity of the gaseous CO2 free jet expansion was calculated using three different approaches and the results showed that the simplified calculations would give approximated cooling values with an 11.6% maximum error. The mass flow rate, upstream pressure and cooling capacity of the gaseous CO2 decreased with time. A maximum 48.5 watts of cooling was recorded at minute 4 and a minimum value of 10.4 watts at the end of the test. The drop in cooling capacity is due to the evaporation of the liquid CO2 inside the small cylinder which cools the two-phase CO2 mixture and causes a pressure drop (from 6 MPa to 2.97 MPa), which also affects the mass flow rate of gaseous CO2 exiting the orifice (from 0.56 g/s to 0.24 g/s). If this cooling technique is to be considered in portable compact-cooling systems, the mass, pressure and cooling capacity drop with time must be solved. One of the solutions could be to cover the cylinder with a heating coat to compensate for the heat absorbed by the evaporation of the liquid CO2.

关键词： Gaseous CO2 Free Jet Expansion Cooling Capacity Compact Air-Cooling Technique

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