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標題: | 結合熱泵之吸附除濕空調系統性能研究 Performance investigation of desiccant air-conditioning system combined with heat pump |
作者: | Chih-Chieh Chen 陳志杰 |
指導教授: | 陳希立 |
關鍵字: | 吸附除濕空調系統,填充床轉輪,熱泵,節能效益,高溫再生, desiccant air-conditioning system,packed bed,heat pump,energy-efficient,high temperature regenerative, |
出版年 : | 2013 |
學位: | 博士 |
摘要: | 本研究之目的為開發一吸附除濕空調設備,期望在空調空間引進室外新鮮空氣的情況下,兼具降低建築物空調耗能之效果,營造一「室內空氣品質優化」及「節約能約」之生活空間。本文藉由實驗方式進行系統各項元件開發、系統設計及系統性能測試等各項研究探討,並進行系統各項效益評估。
系統開發部份,本文首先藉由實驗研究針對矽膠顆粒、氧化鋁顆粒及分子篩顆粒等取得容易且價格便宜之吸附材,進行基礎性能測試及週期運轉性能測試,藉由改變風速、再生溫度及測試週期時間,分析探討各吸附材之吸附與再生性能,期望開發一價格便宜且除濕能力佳之除濕元件。由研究結果顯示,矽膠填充床轉輪之潛熱及顯熱有效度分別為67.9%和59.3%,具有高潛熱交換與低顯熱交換之特性,為適合應用於高溫再生系統之吸附除濕元件。 系統設計與性能測試部份,矽膠顆粒填充於床體需克服因重力影響而分布不均勻之問題,填充床設計創新之處在於利用隔板將填充床分隔成16個的區塊,降低因重力影響而造成顆粒分布不均的情況,並依據基礎與週期運轉測試結果,設定填充床之轉速。填充床轉輪與雙效型熱泵機組之各項元件,組裝配置成「結合熱泵吸附除濕空調系統」。系統性能測試方面,在相同系統風量條件下,以填充床轉輪填充量為主要實驗參數,搭配不同外氣條件及轉輪運轉模式,測試系統於各操作條件下之除濕與再生性能。研究結果顯示,本研究所開發之吸附除濕空調系統,在夏季高溫高濕的操作情況,除濕能力可達7.4 kg/hr。並與蜂巢式矽膠吸附除濕系統相較,單位成本之除濕能力呈現較優異之結果,對於推廣於民生商場、辦公大樓等公共場合具有更高之優勢。最後進行各項系統全年效益分析,吸附除濕空調設備處理新鮮外氣與建築原有空調系統結合,與建築原有空調系統直接引進外氣條件相較可減少11,090 kWh全年空調用電量,約13.8%之節能效益。 The purpose of this study is develop an desiccant air-conditioning system that maintain a healthy indoor environment and be energy-efficient. The system combines a high performance dehumidification component with heat pump to form high temperature regenerative desiccant cooling system. First a novel desiccant wheel is developed and experimentally tested under various operating conditions. Later, the system is designed based on the fundamental tests of each component. The test of the system is conducted in an office and the economical and environmental effect is analyzed. To develop a low-cost dehumidification component, the first part of this research investigates the performance of different desiccant wheels. Three types of desiccant packed bed, filled with silica gel particles, alumina particles, and elite particles respectively, are experimentally tested under different operating conditions. the results show that silica gel packed bed has better performance under the high temperature regeneration condition, and the latent and sensible heat effectiveness could be up to 67.9% and 59.3% respectively. In the traditional design of the desiccant wheel, uneven distribution of the bed due to gravity poses a serious problem. To reduce the influence of gravity, a new packed bed design is proposed that separate the chamber is partitioned into 16 sections. This design also makes packed bed easier to adjust the quantity of the silica gel particles. The last part of this research investigates the performance of the whole system, and the results indicates that the dehumidification capacity could be up to 7.4 kg/hr under the summer weather conditions, high temperature and high humidity. Compared with the system using commercial honeycomb silica gel wheel, the dehumidification capacity per unit cost of our system is much better, and therefore, it is applicable to install our system large space such as supermall and office buildings. Finally, energy conservation analysis of the system is conducted, and it is observed that the total energy saving of the system during a year-round operation is about 11,090 kWh, which means that approximately 13.8% energy could be saved. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/6079 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 機械工程學系 |
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