Abstract
The membrane-based dehumidification technology is greatly energy-efficient for the humidity control. The poly (vinyl alcohol)/poly (vinylidene fluoride) hollow fiber composite membrane for dehumidification has been developed and evaluated in this study. The Poly (vinylidene fluoride) (PVDF) membrane substrates were prepared by the dry-wet spinning. The Poly (vinyl alcohol) (PVA) selective layer was formed through the dynamic cross-flow coating in the lumen side of the PVDF substrate membranes. The effects of the PVA concentration and the coating time on the water vapor performance and the heat removal ratio of the PVA/PVDF composite membrane were investigated experimentally. The results indicated that the PVA concentration of 5.0 wt% and the coating time of 60 min are the optimal conditions for the fabrication of PVA/PVDF hollow fiber composite membrane. With the composite membrane prepared under optimal conditions, a water vapor permeance of 6084 GPU and a heat removal ratio of 10.94% were obtained at 25°C. This work offers a new sight for the development of a novel high-performance composite membrane for the indoor air dehumidifiers.
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