Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier
碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系 === 106 === In this paper, the effects of the physical properties of membrane on the heat and mass transfer characteristics and humidificaion performance of planar humidifiers are investigated experimentally. The physical properties, the air permeability and the water...
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ndltd-TW-106TIT057030192019-11-28T05:22:40Z http://ndltd.ncl.edu.tw/handle/4mz5fx Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier 平板式增濕器之薄膜物理性質及熱質傳實驗研究 Yu-Hsuan Chang 張祐瑄 碩士 國立臺北科技大學 能源與冷凍空調工程系 106 In this paper, the effects of the physical properties of membrane on the heat and mass transfer characteristics and humidificaion performance of planar humidifiers are investigated experimentally. The physical properties, the air permeability and the water vapor permeability, are used as the indexes to evaluate the mambrane applicability for planar humidifiers. Moreover. the performance of the planar humidifiers with different membranes are evaluated by dew point approach temperature, pressure loss, water flux, water recovery, air pumping power and coefficient of performance. In this work, the experiments can be divided into three parts. In the first part, the air permeability rates of a variety of membranes are measured. The experimental results show that the RO, Nafion and PV membranes have lower air permeability rates under the same degree of vacuum pressure.The air separability of these three types of membrane match the requirement of planar humidifiers In the second part, the measurement of the water vapor permeability of the RO, Nafion and PV membranes are carried out. The results show that the membrane with lower air permeability has lower water vapor permeability. In the third part, the planar humidifiers equipped with the RO, Nafion and PV membranes are tested. The experimental results show that the humidifier with the Nafion membrane has the lowest dew point approach temperature. The water flux and the water recovery rate increase along with the dew point approach temperature. On the other hand, the humidifier with the PV membrane has the lowest pressure loss, which leads to the lowest pump work and the highest coefficient of performance. Wei-Mon Yan 顏維謀 2018 學位論文 ; thesis 85 zh-TW |
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碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系 === 106 === In this paper, the effects of the physical properties of membrane on the heat and mass transfer characteristics and humidificaion performance of planar humidifiers are investigated experimentally. The physical properties, the air permeability and the water vapor permeability, are used as the indexes to evaluate the mambrane applicability for planar humidifiers. Moreover. the performance of the planar humidifiers with different membranes are evaluated by dew point approach temperature, pressure loss, water flux, water recovery, air pumping power and coefficient of performance. In this work, the experiments can be divided into three parts. In the first part, the air permeability rates of a variety of membranes are measured. The experimental results show that the RO, Nafion and PV membranes have lower air permeability rates under the same degree of vacuum pressure.The air separability of these three types of membrane match the requirement of planar humidifiers In the second part, the measurement of the water vapor permeability of the RO, Nafion and PV membranes are carried out. The results show that the membrane with lower air permeability has lower water vapor permeability. In the third part, the planar humidifiers equipped with the RO, Nafion and PV membranes are tested. The experimental results show that the humidifier with the Nafion membrane has the lowest dew point approach temperature. The water flux and the water recovery rate increase along with the dew point approach temperature. On the other hand, the humidifier with the PV membrane has the lowest pressure loss, which leads to the lowest pump work and the highest coefficient of performance.
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Wei-Mon Yan |
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Wei-Mon Yan Yu-Hsuan Chang 張祐瑄 |
author |
Yu-Hsuan Chang 張祐瑄 |
spellingShingle |
Yu-Hsuan Chang 張祐瑄 Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
author_sort |
Yu-Hsuan Chang |
title |
Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
title_short |
Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
title_full |
Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
title_fullStr |
Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
title_full_unstemmed |
Study on Physical Properties of Membranes and Heat and Mass Transfer of a Planar Humidifier |
title_sort |
study on physical properties of membranes and heat and mass transfer of a planar humidifier |
publishDate |
2018 |
url |
http://ndltd.ncl.edu.tw/handle/4mz5fx |
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