| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 104 === In a typical building or plant, power consumption of the air conditioning systems accounted for one-third of the total energy usage. The power consumptions of some unique buildings, such as shopping malls and industrial plants, are even up to half of the total electricity consumption. Based on the recent policy related to energy saving and carbon reduction, the development of energy-saving air-conditioning technology has become an issue. Among several dehumidifying technologies, dehumidifying membrane is one of the options with lower energy consumption. This study fabricated a dehumidifying membrane and evaluated its dehumidifying effect for air. The hydrophilic Polyvinyl Alcohol (PVA) and Lithium Chloride (LiCl) solution is coated on the substrate surface of Poly Vinylidene Fluoride (PVDF) membrane, which equips the properties of well mechanical strength, chemical resistance, and thermal stability. By changing the concentration of PVA and LiCl to control the dehumidification performance. First, various concentrations of PVA solution, such as 1, 2, 3, 4, 5wt%, were utilized for comparing the performance of dehumidification. Then, various concentrations of LiCl solution, such as 0.4, 0.8, 1.2, 1.6, 2wt%, were coated on the substrate of 4wt% PVA for comparing the performance of dehumidification. The results showed that membrane with higher PVA concentration presented better performance of dehumidification, but the air flow rate decreased, and vice versa. The membrane with 5wt% PVA solution equipped the best dehumidification performance. The PVA membrane surface of high PVA concentrations was thicker and more complete, and vice versa. In conclusion, this study presented the fabricating process of PVDF/PVA + LiCl composite membrane, and evaluated it dehumidifying effect. In the future, the fabricating process of membrane would be improved continuously for better dehumidification performance.
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