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標題: | 複合除濕材料性能研究與分析 Performance Investigation and Analysis of Composite Desiccant Materials |
作者: | Lu-Kuan Tsai 蔡律寬 |
指導教授: | 陳希立(Sih-Li Chen) |
關鍵字: | 高分子吸濕材料,複合材料,低壓降,低溫再生,除濕轉輪, Polymer desiccant materials,Composite material,Low-pressure drop,Low regeneration temperature,Desiccant wheel, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本研究目的為開發一種低成本、低壓降與能低溫再生的複合材料,用以取代高壓降的顆粒填充轉輪或昂貴的蜂巢式轉輪。
首先,本研究針對矽膠顆粒、皂土、氧化鋁顆粒與高分子材料進行吸濕容量測試,了解各項材料在不同相對濕度下的吸濕特性。接著將三種材料搭配高分子材料製成複合材料,並測試複合材料的結合度,選擇結合度高的複合材料與填充床進行週期式吸脫附性能比較,藉由改變再生溫度,分析探討各除濕材料隨時間變化之吸附性能。實驗結果顯示,矽膠顆粒填充床於短週期內擁有較高的除濕性能;矽膠複合材料於50℃再生時擁有最高的除濕性能,但材料會發生持續性掉粉;氧化鋁複合材料具有良好的結合度與不錯的除濕能力,因此做為後續研究的主要材料。 根據材料基礎測試結果,選擇氧化鋁複合材料於除濕轉輪上測試,實驗結果可發現氧化鋁複合材料的壓降較白矽膠顆粒填充輪降低27%,並能改善轉輪內熱泵的效率,致使蒸發器的除濕與降溫效果增加,有效降低複合材料流道表面的溫度,進而提升複合材料的吸濕能力,雖然複合材料的除濕性能較填充輪低,但整體的總除濕量仍會多於填充輪。在外氣28℃與相對濕度96%條件下,此複合材料除濕轉輪結合熱泵的總除濕量為5 ℓ/hr,複合材料的出口溫升能比填充輪降低7-9℃;並且在夏季能將外氣處理到溫度27-31℃與相對濕度55-60%,比填充輪提供較接近人體舒適範圍的新鮮空氣。 The purpose of this study is to develop a composite desiccant that can keep the cost down, reduce the pressure drop, and can be regenerated at low temperature. The new composite desiccant can be used to replace the packed bed or honeycomb desiccant wheel. In the adsorption isotherm experiment, we tested seven types of desiccant materials, including Crystalline Silica Gel, Non-crystalline Silica Gel, Bentonite, Activated Alumina, Polyacrylic Acid, Sodium Polyacrylate, and Sodium Alginate. By comparing the adsorption capacity of each desiccant material under different relative humidity conditions, it is essential for us to identify the characteristic of desiccant materials. In order to make the perfect combination of composite desiccant, we tested various desiccant materials mixed with polymer desiccant materials. Eventually, we selected Silica Gel packed bed, Activated Alumina packed bed and three different types of composite desiccant, to study the change of dehumidification performance with time under different regeneration conditions. The results showed that Silica Gel packed bed had the highest performance in short periodic flow. The Silica Gel composite desiccant had the highest performance under 50℃ regeneration temperature, but the composite material would continuously break down and contaminate the supply air. Alumina composite desiccant had good bonding and excellent dehumidification performance. So, Alumina composite desiccant was used as the main material for the follow-up study. According to the basic dehumidification test results of these materials, we chose Alumina composite desiccant as the material for the desiccant wheel test. In the desiccant wheel testing, Alumina composite desiccant wheel can reduce the pressure drop by 27% compared with Silica Gel packed bed. It can also improve the efficiency of the heat pump inside the desiccant wheel, which will lead to better dehumidification performance of condensation and lower temperature of the evaporator. The adsorption performance will increase, resulting from the lower surface temperature of the composite desiccant. Although the dehumidification performance of the composite desiccant was lower than the packed bed, the total dehumidification performance of the composite desiccant was still better than the packed bed. The dehumidification capacity of the composite desiccant wheel can reach 5 ℓ/hr at 28℃ and relative humidity of 96%. The supply air temperature rise was 7-9℃ lower than the packed bed. In summer condition, the temperature of supply air was about 27-31℃ and relative humidity of 55-60%. So it can provide a more comfortable range of fresh air for the human body than the packed bed. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72622 |
DOI: | 10.6342/NTU201902163 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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