A coupled heat-moisture transfer model for the design of cooling textiles

Given the frequent occurrence of extreme heat in recent years, it is crucial to prevent hyperthermia and ensure the safety of individuals at outdoors. However, comprehensive and effective evaluation methods for clothed human body remain insufficient, particularly regarding the critical need to understand the heat and moisture transfer of cooling textiles. This study aims to enhance cooling performance by investigating the effects of different textile thermal properties, such as solar reflectivity, thermal emissivity, and thermal conductivity. First, a coupled heat-moisture transfer model between the human body, textile, and the environment is established, enabling an accurate assessment of heat loss under high-temperature conditions. Furthermore, heat losses for individuals under stationary, walking, and running conditions are evaluated. The results show that the model successfully replicates experimental findings. Under high temperature conditions, solar reflectivity of textiles plays a significant role in regulating heat transfer, while the thermal emissivity and thermal conductivity have less impact on thermal performance. This study provides a theoretical foundation and practical guidance for the development of cooling textiles, which would be beneficial for assessing human thermal management in high-temperature environments.