The transfer process of heat and water vapor in a porous fiber membrane was investigated through the simulation of a 3D model for optimizing the configuration design. 3D models with different fiber orientations and porosity were constructed by the parameter input method, and the accuracy of the model was validated by the coefficient of determination (R²) between the apparent velocity of the model and the air permeability of the membrane. The permeability of 3D model was used to reflect the discrepancy in fiber orientation of the model. The influences of fiber orientation and porosity on heat and water vapor transfer were surveyed by the coupled physics of heat transfer and dilute substance transfer. Since there was no temperature difference in the entire domain, heat conduction (10⁻⁹ W/m²) and moisture convection (10⁻¹⁴ mol·m⁻²·s⁻¹) were faint in the model. With the diffusion of water vapor in the moisture, the heat convection flux and water vapor diffusion flux gradually decreased and reached equilibrium. When the permeability was increased by adjusting the fiber orientation (from 1.002 to 1.200 m²), the heat convection flux and water vapor diffusion flux followed a similar growth pattern due to the coupling effect of heat transfer and water vapor transfer. The R² for the heat convection flux and water vapor transmission rate of the simulations and experiments with different porosity (44.87, 47.64 and 50.15%) were 0.999 and 0.923, respectively, which demonstrated the validation of the simulation in heat and water vapor transfer.

通过对3D模型进行仿真以优化配置设计，研究了多孔纤维膜中热量和水蒸气的传递过程。通过参数输入法构建了不同纤维取向和孔隙率的3D模型，模型的表观速度与膜的透气性之间的决定系数(R ² )验证了模型的准确性。3D模型的渗透率用于反映模型纤维取向的差异。通过传热和稀物质传递的耦合物理研究了纤维取向和孔隙率对热量和水蒸气传递的影响。由于整个域内没有温差，热传导（10 ^-9 W/m ² ) 和水分对流(10 ^-14  mol·m ^-2 ·s ^-1 ) 在模型中是微弱的。随着水蒸气在水分中的扩散，热对流通量和水蒸气扩散通量逐渐减小并达到平衡。当通过调整纤维取向（从 1.002 到 1.200 m ²）增加渗透率时，由于传热和水蒸气传递的耦合效应，热对流通量和水蒸气扩散通量遵循相似的增长模式。R ² 不同孔隙率（44.87、47.64和50.15%）的模拟和实验的热对流通量和水汽透过率分别为0.999和0.923，证明了模拟在传热和水汽传递方面的有效性。