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Title: | 中央空調系統運轉耗能模擬與控制策略最佳化之研究 Simulation of Energy Consumption and Optimization of Control Strategy of the Central Air-Conditioning System |
Authors: | Yu-Fu Kuo 郭祐甫 |
Advisor: | 陳希立 |
Keyword: | 粒子群最佳化,中央空調系統,冷卻水塔,濕盤管, particle swarm optimization,centralized air-conditioning system,cooling tower,wet finned-tube heat exchanger, |
Publication Year : | 2010 |
Degree: | 博士 |
Abstract: | 本文以模擬計算方式,探討中央空調系統於不同運轉策略下,對系統總耗能的影響,並提出實務運轉可應用之方法。本文先以五個通用數學問題比較四種粒子群最佳化演算法的效能,以求解穩定性為主要考量,歸納得線性遞減慣性權重法較適合本研究應用,並使用此法解決後續之空調系統最佳化運轉策略問題。接著對中央空調系統運轉策略問題進行研究,將問題分為四項子題,分別為:冰水主機群負載分配、冰水主機與冷卻水塔聯合運轉、冰水主機與空調箱聯合運轉、以及完整之中央空調系統運轉,其中驗證了空調設備的耗電計算模式,建立並驗證冷卻水塔與空調箱濕盤管的性能簡化計算模式。本文所提出之冷卻水塔與空調箱濕盤管性能簡化計算模式,經驗證均優於前人所提之計算模式,可於較大操作條件範圍求得較準確的熱傳數據。而在系統運轉策略方面,獲得冰水供水溫度最佳化調整是最有效方案的結論,在本研究案例分析中,系統全年的用電量可減少862.3 MW•hr,節能率達14.85%,二氧化碳排放量亦可降低548.4 ton。此最佳冰水溫度與系統負載率呈線性關係,如此便可依據系統運轉的負載率,即時且容易地調整冰水供水溫度。 This thesis numerically investigates the power consumption of the centralized air-conditioning system under several operation strategies and then concludes a method to implement in practice. First, this study compares the performances of four updating rules of the particle swarm optimization through applying five mathematic problems. The linear-decayed inertia weight method is favorable for this study because of the stability of solutions searching. Then, four subjects, which are chiller-loading distribution, chillers and cooling towers cooperation, chilled-water and air-handler system cooperation and integrated centralized air-conditioning system operation, are specified to investigate the control strategies. The validations of the power consumption models of the air-conditioning components are accomplished. The simplified heat transfer models of cooling towers and wet finned-tube heat exchangers are also proposed and validated. The proposed simplified models can be implemented with a wide range and the predicting results are better than present models. The proposed operation strategy is optimal chilled-water supply temperature. In one sample case, the system operated under the proposed strategy can save the energy of 862.3 MW•hr and reduce the carbon-dioxide emission of 548.4 tons. The energy-saving rate can reach 14.85% compared with the energy consumption of the traditional operation strategy. The optimal chilled-water supply temperature can be correlated as a linear function of cooling load rate. Therefore, the chilled-water supply temperature can be adjusted easily and rapidly according to the system cooling load rate. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44784 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 機械工程學系 |
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ntu-99-1.pdf Restricted Access | 3.53 MB | Adobe PDF |
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