Modeling the heat transfer in a PCM cooling vest
Modeling the heat transfer in a PCM cooling vest
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DOI：
10.1080/00405000.2014.959800
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
M. Mokhtari Yazdi;M. Sheikhzadeh;S. Borhani
中科院分区：
文献类型：
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作者：
M. Mokhtari Yazdi;M. Sheikhzadeh;S. Borhani
相变材料降温服装是改善高温环境下工作人员热舒适性和提高工作效率的实用技术之一。这些衣服的效率和它们冷却身体的能力一直是许多研究的主题。在这项研究中，它已被试图调查的方式，热量从身体传递到冷却服装，并检查其对一个人的舒适性产生的影响。为此，本文采用有限元方法模拟人体-服装-环境三部分系统，并借助ANSYS软件的热分析，解决了人体-服装-环境三部分之间的热交换问题。模拟结果表明，相变材料吸收人体多余的热量，可使皮肤温度降低至少2.6°C。相变袋的平均热吸收在过程开始时为215.4W/m2，在一小时内为128.7W/m2。主观测试结果也验证了模型的准确性，实验结果与模型结果吻合较好。
Cooling garments containing phase change materials (PCM) is one of practical techniques used for improving thermal comfort and worker’s performance in hot environments. The efficiency of these garments and their ability in cooling the body has been the subject of much research. In this study, it has been attempted to investigate the way in which heat is transferred from the body to the cooling garment and examine its resulting effect on one’s comfort. So, the three-part system of body–garment–environment has been simulated through the finite element method, and the problem of heat exchange between these three parts has been solved with the help of thermal analysis of ANSYS software. The results of modeling indicated that absorbing body’s excessive heat through PCMs could decrease skin’s temperature to at least 2.6°C. The average of heat absorption by phase change bags was 215.4 W/m2 at the beginning of the process and 128.7 W/m2 within one hour. The accuracy of the model was also verified with the results of subjective tests, and a good agreement between the experimental and model results was shown.