为了指导织物内相变材料的设计,基于织物热湿耦合模型,发展了一个考虑附加相变微胶囊影响的织物内热湿传递模型.采用控制体积法和有限差分法对模型方程进行了求解.预测结果和实验数据吻合良好.基于所建模型,研究了相变微胶囊半径及含量对织物热湿性能影响.数值结果表明,在当织物温度达到相变材料(PCM)的相变温度区间时,相变材料具有延迟织物内温度变化作用.PCM半径越小延迟温度变化幅度越大,但延迟时间短.PCM含量越多延迟织物温度变化的效果越好.
A dynamic model of heat and moisture transfer in porous hygroscopic textiles containing phase change materials (PCM) was developed, with consideration of the heat storage and thermoregulatory characteristics of PCM during heating and cooling processes. In this model the mechanisms of coupled heat and moisture transfer in fabric were considered. And the apparent heat capacity method was used to deal with the simulation of phase transition process, and the finite volume and finite difference methods were utilized to solve the governing equations. Meanwhile, the theoretical predictions were compared with experimental data, and good agreement was observed between the two, indicating that the model was satisfactory. Also, the effects of radii and content of the PCM microeapsules on heat and moisture transfer in fabric were investigated. The results showed that the delay effect of the PCM with a large amount on fabric temperature variation was larger than that with a small amount of the PCM, and the delay range of the PCM with small radius was higher than that with large radius,but the delay time is short.