A new hybrid personal cooling system (HPCS) incorporating insulation pads for thermal comfort management: Experimental validation and parametric study

Kang, Zhanxiao; Udayraj,; Wan, Xianfu; Wang, Faming

doi:10.1016/j.buildenv.2018.09.033

Cited by 40 publications

(23 citation statements)

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“…Moreover, the moisture in the ambient environment might be condensed on the PCM surface at sufficiently high environmental RHs, which also shortens the PCM melting process and hence reduces the efficient working time of the HPCS. Hence, the results reported in our previous study [26] cannot be generalized to any environmental condition other than the studied condition (i.e., 36 °C, RH=59%). Therefore, it's very meaningful to examine the effects of the environmental temperature and RH on the cooling performance of the new HPCS so as to guide the energy-efficient application of the HPCS in various environmental conditions.…”

Section: Introductionmentioning

confidence: 73%

“…The validated numerical model [26] describing the heat and mass transfer through the new HPCS was applied to investigate the effects of the environment temperature and RH on the cooling performance of the new HPCS. In this model, the entire body-HPCS system was divided into 5 nude body segments (i.e., head, left foot, right foot, left hand and right hand), 6 clothing-body segments covered with PCMs & insulation layers (i.e., chest, back, left arm, right arm, left thigh and right thigh), and 11 clothing-body segments without the PCMs & insulation layers (i.e., chest, back, pelvis, left shoulder, right shoulder, left arm, right arm, left thigh and right thigh, left leg and right leg).…”

Section: Numerical Model Of the Hpcsmentioning

confidence: 99%

“…In order to solve the early melting issue of the PCMs in the HPCS, the HPCS was redesigned by adding additional EPE (expanded polyethylene) insulation in between the PCM packs and the outer clothing layer (hereby denoted as the new HPCS), and its cooling performance influenced by the clothing characteristics was examined by a recent numerical study [26]. The results showed that the new HPCS could significantly reduce the heat drawn by the PCMs from the hot environment at 36 ℃ and RH=59%.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, based on the validated numerical model shown in our previous study [26], we performed a numerical parametric study to investigate the effects of the environmental temperature and relative humidity (RH) on the cooling performance of the new HPCS. The human physiological responses (e.g., mean skin temperature, chest temperature & core temperature) and such parameters used to characterize the PCM thermal performance (e.g., PCM temperature and PCM heat absorptions form environment & body) under different environmental conditions were examined and compared.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 73%

Section: Numerical Model Of the Hpcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhicheng¹,

Wan²,

Wang³

et al. 2018

Preprint

Self Cite

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“…A temperatura corporal central, ou seja, a temperatura dos tecidos mais profundos do corpo permanece constante, com variação fisiológica de aproximadamente 0,6 °C, a não ser em caso de febre. O meio ambiente influência na temperatura da camada externa, por isto esta não é regulada dentro dos mesmos limites da temperatura interna do corpo (WIDMAIER;RAFF;STRANG, 2006;KANG et al, 2018).…”

Section: Referencial Teóricounclassified

O estresse térmico visto como um risco ocupacional

Rosa

Lima

2019

R. Gest. Industr.

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Com a existência de riscos ocupacionais específicos, as questões de saúde e segurança do trabalhador passam a ser um elemento de destaque na gestão do negócio, sendo um diferencial competitivo para as indústrias. Dentre os inúmeros riscos ocupacionais existentes, o estresse térmico foi objeto deste estudo, pois tal estricção pode interferir no rendimento da produção e expor o trabalhador ao risco de acidentes, doenças ocupacionais e morte. Para que se pudesse compreender como o fator térmico influi em diversas áreas da produção – industrial e intelectual –, foram apresentados estudos de diversos pesquisadores brasileiros sobre o tema, bem como seus resultados. Observou-se que, com o avanço das pesquisas, muitos estudos foram realizados não só em câmaras climatizadas, mas também em situações reais do cotidiano, com pessoas desempenhando suas atividades rotineiras. Através de tais pesquisas, foi possível observar que o homem, sendo um animal homeotérmico, precisa manter sua temperatura constante, sofrendo influência direta da temperatura do ambiente em que se encontra. O risco de graves doenças provocadas pelo calor pode ser diminuído por meio de várias medidas para combatê-las, como a aclimatação ao calor, controle da exposição ao estresse térmico e manutenção da hidratação. Antes de qualquer índice ou norma, defende-se que todas as organizações devem enxergar o estresse térmico como um risco ocupacional de fato, buscando as condições que mais satisfaçam o homem com relação às suas sensações térmicas, trazendo maior disposição para o trabalho e a consequente melhoria da qualidade de vida.

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Squid‐like soft heat pipe for multiple heat transport

Kang

Jiang

Hong

et al. 2022

Droplet

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Soft heat pipes are vital in many applications. Inspired by the structure of a squid, we proposed a squid-like soft heat pipe with multiple heat transport branches that has excellent flexibility and outstanding thermal performance. Each branch could transport heat to different locations for multiple heating or cooling applications.The proposed soft heat pipe worked as a pulsating heat pipe with a unidirectional flow of liquid slugs and vapor bubbles. Its thermal performance was investigated at different heating temperatures, bending angles, and inclination angles. The result showed that the highest equivalent thermal conductivity of the squid-like soft heat pipe could be up to 6750 W/(m · K), almost 17 times that of copper. Besides, the bending angle had little effect on its thermal performance, with the equivalent thermal conductivity reducing 10%-13% when the heat pipe was bent from 0°to 90°. The thermal performance of the soft heat pipe was affected by the inclination angle, with the equivalent thermal conductivity reducing 20%-25% as the inclination angle was reduced from 90°to 30°. The proposed soft heat pipe is scalable by increasing the tube length and branches. It has many promising applications like waste heat recovery, electronic device cooling, personal thermal management, and renewable energy harvesting.

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A new hybrid personal cooling system (HPCS) incorporating insulation pads for thermal comfort management: Experimental validation and parametric study

Cited by 40 publications

References 46 publications

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

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

O estresse térmico visto como um risco ocupacional

Squid‐like soft heat pipe for multiple heat transport

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