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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis of cooling effect of hybrid cooling clothing incorporated with phase change material (PCM) packs and air ventilation fans
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Numerical analysis of cooling effect of hybrid cooling clothing incorporated with phase change material (PCM) packs and air ventilation fans

机译：装有相变材料包和通风风扇的混合冷却服冷却效果的数值分析

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摘要

Hybrid personal cooling garment incorporating phase change materials (PCMs) and ventilation fans is developed recently and found to be effective from the standpoint of cooling effect and thermal comfort of wearers under different environmental conditions. In the present study, a numerical model is developed to analyse heat and moisture transfer through the hybrid personal cooling garment and understand underlying physical mechanisms. The clothing heat and moisture transfer model is coupled with a multi node human thermoregulation model to be able to determine human thermo-physiological responses under dynamic environmental conditions. The multi-node Tanabe's model is modified to take into account PCMs and non-PCMs covered parts in body segments Apparent heats capacity method is used to deal with the phase change behaviour. The moisture barrier effect of PCM packs along with the evaporation and condensation at the surface of PCM packs are also considered. Results obtained from the newly developed numerical model are compared with the human trial data. Mean skin temperature and core temperature obtained from the numerical model are found to be in good agreement with the experimental results. The model is further used to analyse temperature and moisture distributions within the clothing and heat transfer through hybrid personal cooling clothing. Significantly lower clothing system temperature, core and mean skin temperatures are obtained for hybrid personal cooling clothing as compared to air ventilation clothing. Effects of PCMs and air ventilation are also analysed on heat transfer through the hybrid personal cooling clothing. Furthermore, performance of various personal cooling approaches involving PCMs and air ventilation is compared with the normal clothing under the warm environmental condition. It is found that the hybrid personal cooling clothing exhibits better cooling performance as compared to clothing with other cooling approaches involving either only PCMs or only air ventilation fans. (C) 2018 Elsevier Ltd. All rights reserved.
机译：结合相变材料（PCM）和通风风扇的混合个人冷却衣服最近得到了开发，从冷却效果和穿着者在不同环境条件下的热舒适性的角度来看，这种混合衣服很有效。在本研究中，建立了一个数值模型来分析通过混合式个人降温服传热和水分的过程，并了解潜在的物理机理。服装的热量和水分传递模型与多节点人体温度调节模型相结合，能够确定动态环境条件下的人体热生理响应。修改了多节点田边的模型，以考虑车身段中的PCM和非PCM覆盖的零件。表观热容法用于处理相变行为。还应考虑PCM组件的防潮作用以及PCM组件表面的蒸发和冷凝。从新开发的数值模型获得的结果与人体试验数据进行比较。从数值模型获得的平均皮肤温度和核心温度与实验结果非常吻合。该模型还用于分析衣服内的温度和水分分布以及通过混合式个人降温衣服的热传递。与空气通风的衣服相比，混合式个人降温衣服的衣服系统温度，核心温度和平均皮肤温度明显降低。还分析了PCM和空气流通对混合式个人降温服传热的影响。此外，在温暖的环境条件下，将与PCM和空气通风有关的各种个人降温方法的性能与正常衣物进行了比较。已经发现，与具有仅涉及PCM或仅涉及通风风扇的其他冷却方法的衣服相比，混合式个人冷却衣服具有更好的冷却性能。 （C）2018 Elsevier Ltd.保留所有权利。

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