A computational analysis for effects of fibre hygroscopicity on heat and moisture transfer in textiles with PCM microcapsules

Abstract

To describe the heat and moisture transfer in porous textiles with phase change material (PCM) microcapsules, a dynamic model was developed. In the model the moisture sorption of fibres and the effects of the phase transition temperature range and the heating/cooling rate on the phase change processes of the PCM were considered. Meanwhile, the theoretical predictions were validated by experimental data. Then, the processes of moisture transfer in the inter-fibre void spaces and in the fibres and their interaction with heat transfer and regulation of PCM microcapsules during ambient transient conditions were illustrated by a series of 3D diagrams. The results show that fibre hygroscopicity impacts the effect of PCM microcapsules in delaying fabric temperature variations very significantly.