- 學位論文
創新型冷凝盤管對氣冷式冰水機能源效率提昇之研究
The Study of an Innovative Condensing Coil for Improving Energy Efficiency of Air-Cooled Liquid Chillers
摘要
氣冷式冰水機(air-cooled liquid chillers)已廣泛使用在辦公大樓、工商業等相關製冷需求。此類設備由於受到外型尺寸限制，通常會將多組鰭管式冷凝盤管(finned-tube condensing coils)與軸流式風機(axial fan)排列配置成三角形合圍空間，一旦實際應用於機組運轉時，會影響冷凝盤管表面出口速度，而影響冷凝盤管熱傳性能，進而降低冰水機組之能源效率。我國對氣冷式冰水機性能係數(COP)要求之標準值為2.79，經由調查發現我國效率標準與歐盟A級水準之3.1有11%差距，而和中國國家標準(CAS)列為A級之3.4則有22%差距。有鑑於此，探討國內氣冷式冰水機在現有製造技術上是否仍有性能提升空間，值得吾人作進一步研究。因此本文主要研究目的在於: 藉由實驗分析的方式，探討創新冷凝盤管配置對氣冷式冰水機性能提昇之影響，除了以性能係數(Coefficient of Performance, COP)作為評估機組整體性能改善之指標外，亦使用熱力不可性分析，探討各別元件效率之相互影響程度。研究結果顯示: 利用不可逆性分析對系統診斷，依乾膨式及滿液式系統的不同，採用創新型冷凝盤管會使得冷凝器不可逆性降低，不可逆性各降5.36%及5.78%。此外，不論是乾膨式或是滿液式系統，在不增加材料成本考量下，採用創新型冷凝盤管者其機組性能COP分別有6.62%及6.53%之提昇效益。
並列摘要
The air-cooled liquid chiller has been applied widely in the field of office buildings air conditioning, industrial and commercial for years. Due to the concern of the volume, the multi-finned-tube condenser and the axial fan are usually set in the shape of triangle. However, this kind of disposal decreases the by-pass rate of the condensing coil of velocity distribution and the heat transfer efficiency of condensing coil. Furthermore, the equipment's energy efficiency was also diminished. The Bureau of Energy suggests that coefficient of performance (COP) for air-cooled liquid chiller is 2.79，According to the recent research, the average energy efficiency standards of the air-cooled liquid chillers in Taiwan is 11% higher than European Union's A grade, 22% higher than the A grade of CAS. Therefore, it worth to discuss how to improving the performance of the air-cooled liquid chillers on the existing manufacturing technology. Therefore, the main purpose of this study is to discuss an innovative condensing coil for improving energy efficiency of air-cooled liquid chillers by experimental measurement and analysis, beside evaluating the increase of the equipment's performance by the COP, but also applied irreversibility method to examine the interact among each item's efficiency. The research results show that according to the irreversibility analysis, both dry expansion evaporator and flooded evaporator systems, had a decrease e of 5.36% and 5.78% in its irreversibility with the innovative condensing coil. Moreover, both dry expansion evaporator and flooded evaporator systems had a increase of 6.62% and 6.53% in its COP with the innovative condensing coil and no further spending.