Experimental study on the performance of a liquid cooling garment with the application of MEPCMS

Wang, Tao; Wang, Liang; Bai, Lizhan; Lin, Guiping; Bu, Xueqin; Liu, Xiangyang; Xie, Gongnan

doi:10.1016/j.enconman.2015.07.043

Cited by 37 publications

(17 citation statements)

References 24 publications

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“…In fact, PTM may be dated back to the time when developing spacesuits for astronauts and garments for firefighters and soldiers, who are working in challenging or even extreme environments. [66][67][68][69] Besides the requirement of PTM for providing a thermally comfortable environment, the spacesuits also need to provide a stable internal pressure, supply of breathable oxygen and elimination of carbon dioxide, sufficient mechanical stress, communication system, mobility to achieve space tasks, shielding against ultraviolet radiation, etc. The garments for firefighters should shield the outside hightemperature thermal radiation and offer fire resistance.…”

Section: Conventional Strategiesmentioning

confidence: 99%

Emerging Materials and Strategies for Personal Thermal Management

Liu

Shin

et al. 2020

Advanced Energy Materials

407

242

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us warm in cold climates and shielded us from the nakedness for modesty and civilization. [1,2] Cloth is also a platform for artists, designers, and tailors to advance the clothing demands with emerging materials, process, and fashion. [2] While the majority of the functionalities of clothes lie in their physical attributes, such as their softness, breathability, air/ vapor permeability, and, of course the appearance, their role in thermal management is equally, if not more, important. The primary goal of clothing is to satisfy human being's basic needs in thermal comfort, by providing cooling in the hot environment or heating in the cold environment. [1] The energy management aspect of clothing is becoming an increasingly important and attractive aspect due to our increasing awareness to energy consumption and our persisting pursuit of comfort and health. The finite availability and the associated environmental consequence of fossil fuels have motivated us to save energy from virtually all aspects of our daily lives. A suitable thermal envelop is a necessity for our living and working. To create a comfortable indoor environment, the building heating, ventilation, and air conditioning (HVAC) systems are widely used for space cooling and heating at the expense of excessive energy consumption. [3][4][5][6] According to United States In this decade, the demands of energy saving and diverse personal thermoregulation requirements along with the emergence of wearable electronics and smart textiles give rise to the resurgence of personal thermal management (PTM) technologies. PTM, including personal cooling, heating, insulation, and thermoregulation, are far more flexible and extensive than the traditional air/liquid cooling garments for the human body. Concomitantly, many new advanced materials and strategies have emerged in this decade, promoting the thermoregulation performance and the wearing comfort of PTM simultaneously. In this review, an overview is presented of the state-ofthe-art and the prospects in this burgeoning field. The emerging materials and strategies of PTM are introduced, and classed by their thermal functions. The concept of infrared-transparent visible-opaque fabric (ITVOF) is first highlighted, as it triggers the work on advanced PTM by combining it with radiative cooling, and the corresponding implementations and realizations are subsequently introduced, followed by wearable heaters, flexible thermoelectric devices, and sweat-management Janus textiles. Finally, critical considerations on the challenges and opportunities of PTM are presented and future directions are identified, including thermally conductive polymers and fibers, physiological/psychological statistical analysis, and smart PTM strategies.

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Section: Conventional Strategiesmentioning

confidence: 99%

Emerging Materials and Strategies for Personal Thermal Management

Liu

Shin

et al. 2020

Advanced Energy Materials

407

242

View full text Add to dashboard Cite

show abstract

“…For example, the natural air ventilation might transport ambient heat to the human body if the environmental temperature were greater than the skin temperature; the use of PCMs generally hinders the moisture dissipation from the skin to the ambient environment; the evaporative cooling does not work well in the hot environments with high relative humidity. In order to overcome the inherent limitations of every cooling technique, hybrid cooling systems incorporated with two or more cooling methods in one cooling system were proposed [ 22 , 23 , 24 , 25 ]. Webbon et al [ 22 ] found that garments incorporated with the liquid and ventilation cooling could provide better thermal comfort for astronauts as compared to single cooling systems.…”

Section: Introductionmentioning

confidence: 99%

“…Webbon et al [ 22 ] found that garments incorporated with the liquid and ventilation cooling could provide better thermal comfort for astronauts as compared to single cooling systems. Wang et al [ 23 ] studied the performance of a liquid cooling garment incorporated with PCM microcapsules, which showed that the inlet temperature, mass flow rate and the volume concentration of PCM microcapsules must be adjusted appropriately to achieve the best cooling performance. Song and Wang [ 24 ] integrated PCM packs and ventilation fans into a cooling garment named as a hybrid personal cooling system (HPCS), and found that the HPCS could significantly reduce the heat strain of wearers in a hot, humid environment.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Analysis of the Cooling Performance of a Hybrid Personal Cooling System (HPCS): Effects of Ambient Temperature and Relative Humidity

Kang

Wang

et al. 2020

IJERPH

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Hybrid personal cooling systems (HPCS) incorporated with ventilation fans and phase change materials (PCMs) have shown its superior capability for mitigating workers’ heat strain while performing heavy labor work in hot environments. In a previous study, the effects of thermal resistance of insulation pads, and latent heat and melting temperature of PCMs on the HPCS’s thermal performance have been investigated. In addition to the aforementioned factors, environmental conditions, i.e., ambient temperature and relative humidity, also significantly affect the thermal performance of the HPCS. In this paper, a numerical parametric study was performed to investigate the effects of the environmental temperature and relative humidity (RH) on the thermal management of the HPCS. Five levels of air temperature under RH = 50% (i.e., 32, 34, 36, 38 and 40 °C) and four levels of environmental RH at two ambient temperatures of 36 and 40 °C were selected (i.e., RH = 30, 50, 70 and 90%) for the numerical analysis. Results show that high environmental temperatures could accelerate the PCM melting process and thereby weaken the cooling performance of HPCS. In the moderately hot environment (36 °C), HPCS presented good cooling performance with the maximum core temperature at around 37.5 °C during excise when the ambient RH ≤ 70%, whereas good cooling performance could be only seen under RH ≤ 50% in the extremely hot environment (40 °C). Thus, it may be concluded that the maximum environmental RH under which the HPCS exhibiting good cooling performance decreases with an increase in the environmental temperature.

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“…For example, the ventilation air fanned from environment might transport ambient heat to the human body if the environmental temperature were greater than the skin temperature; the PCMs generally hinder the moisture dissipation from the skin to the ambient environment; the evaporative cooling does not work well in the hot environments with a high relative humidity. Therefore, hybrid cooling systems incorporated with two or more cooling methods in one cooling system were proposed and investigated [19][20][21][22] so as to overcome the limitations brought by the single cooling technique. Webbon et al [19] found garments incorporated with the liquid and ventilation cooling could provide better thermal comfort for the astronauts as compared to single cooling systems.…”

Section: Introductionmentioning

confidence: 99%

“…Webbon et al [19] found garments incorporated with the liquid and ventilation cooling could provide better thermal comfort for the astronauts as compared to single cooling systems. Wang et al [20] studied the performance of a liquid cooling garment incorporated with PCM microcapsules, which showed that the inlet temperature, mass flow rate and the volume concentration of PCM microcapsules must be adjusted appropriately to achieve the best cooling performance. Song and Wang [21] integrated PCM packs and ventilation fans into one cooling garment named as hybrid personal cooling system (HPCS), and found that the HPCS could significantly reduce the heat strain of wearers in hot environments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Cooling Performance of a Hybrid Personal Cooling System (HPCS) under Different Hot Environments

Zhicheng¹,

Wan²,

Wang³

et al. 2018

Preprint

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The hybrid personal cooling system (HPCS) consisted of ventilation fans and phase change materials (PCMs) covered with insulation pads is a promising wearable cooling system to mitigate heat strain and heat-related illnesses of occupational workers with heavy labor in hot environments. Effects of clothing characteristics (e.g., thermal resistance of insulation pads, latent heat and melting temperature of PCMs) on the thermal performance of the HPCS have been investigated in detail in our previous study. Apart from the aforementioned factors, environmental conditions, i.e., environmental temperature and relative humidity, also significantly affect the thermal performance of the HPCS. In this paper, a numerical parametric study was performed to investigate the effects of the environmental temperature and relative humidity (RH) on the thermal management of the HPCS. Five levels of air temperature under environmental RH=50% were chosen (i.e., 32, 34, 36, 38 and 40 ºC) to study the impact of environmental temperature on the HPCS’s cooling performance. In addition, four levels of environmental RH at ambient temperatures of 36 and 40 ºC were selected (i.e., 30, 50, 70 and 90%) to examine the effect of RH on cooling performance of the HPCS. Results show that high environmental temperatures could accelerate the PCM melting process and thereby weaken the cooling performance of HPCS. In the moderately hot environment (36 °C), the HPCS presented good cooling performance with the maximum core temperature at around 37.5 °C during excise when the ambient RH≤70%, whereas good cooling performance could be only seen under RH≤50% in the extremely hot environment (40 °C). Thus, it may be concluded that the maximum environmental RH for the HPCS exhibiting good cooling performance decreases with the increase in the environmental temperature.

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Experimental study on the performance of a liquid cooling garment with the application of MEPCMS

Cited by 37 publications

References 24 publications

Emerging Materials and Strategies for Personal Thermal Management

Emerging Materials and Strategies for Personal Thermal Management

A Numerical Analysis of the Cooling Performance of a Hybrid Personal Cooling System (HPCS): Effects of Ambient Temperature and Relative Humidity

Numerical Analysis on the Cooling Performance of a Hybrid Personal Cooling System (HPCS) under Different Hot Environments

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