相变降温服热分析

Analysis of heat sinking vest with phase-change material

为了研究相变材料降温服在高温高湿条件下的热防护性能和相变材料数值计算方法应用于降温服传热计算的可行性,在分析服装传热传质特点及计算方法的基础上,利用焓值分析法对服装中的相变材料建立传热模型,在整个区域建立统一的能量方程,在区域结点进行离散,并进行隐式求解,得到焓的分布.建立了关于人体、降温服相变材料、人体着装、环境的传热模型,用此模型进行高温高湿条件下的人体着装的动态仿真,并进行试验验证.降温服计算和实验结果吻合良好,可以看出,相变降温服热分析方法可靠合理.

To investigate the thermal protection effects of a heat sinking vest with phase-change material in high-temperature and high-humidity environment and the feasibility of numerical computation of heat transfer to the vest, based on the analysis of heat and mass transfer characteristic about the accouterments, a thermodynamic model was set up with the enthalpy method. The uniform energy equation was constructed for the whole domain, and the implicit difference equation was used in every node, the distribution of enthalpy was solved by numerical method. Simulation technique of the thermal system was established with the combination of human body thermal regulation model. It was used to analyze the accouterments. A experiment was carried out to vali- date the final computer results, and the experimental and computer results were tallied well. The results indicate that using numerical method of phase-change material in heat transfer of vest is credible and appropriate.