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標題: | 地源熱泵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 Control of Geothermal Heat pump System |
作者: | Chung-Kuan Kung 龔仲寬 |
指導教授: | 陳希立 |
關鍵字: | 粒子群演算法,熱泵,地埋熱交換器,地源熱泵, Particle Swarm Optimization(PSO),Heat pump,Borehole Heat Exchanger,Geothermal Heat Pump, |
出版年 : | 2012 |
學位: | 博士 |
摘要: | 本研究之主要探討地源熱泵系統於某工廠負載案例之最佳化設計。本研究的地源熱泵系統是由熱泵機組與地埋熱交換器組成,在文中以實驗與數學計算模式,分別探討熱泵機組與地埋熱交換器的性能。接著,再利用最佳化方法針對地源熱泵系統於不同運轉策略與設備容量組合下,對系統生命週期成本的影響,最後提出最佳化之設計。在熱泵機組實驗性能測試的部分,以性能係數作為分析的指標。由研究結果發現,熱泵機組的數學計算模式與實驗數據趨勢相符合,其相關係數R2為0.9867。在地埋熱交換器實驗性能測試部分,以熱阻計算方式求解地埋熱交換器螺旋管出口水溫與圓筒內部水溫隨時間變化的情形。研究結果顯示,地埋熱交換器螺旋管出口水溫及圓筒內部水溫數學計算模式與實驗數據趨勢相符合,平均誤差分別為0.31%與3.12%。在最佳化演算法的部分,利用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設備容量最佳化等問題。在熱泵、水泵啟停順序等離散型問題則以粒子演算法結合俄羅斯輪盤法進行求解。最後利用上述的研究成果,以最佳化方法針對地源熱泵系統應用於某工廠負載的案例進行最佳化設計,探討的參數共有7個,分別為熱泵、水泵啟停狀態、熱泵機組的容量、地埋熱交換器的UA值、冷、熱水儲槽的容量及冷、熱水儲槽的初始水溫等。研究結果顯示,與傳統鍋爐結合冰水主機系統相比,地源熱泵的最佳化設計於10年的生命週期成本可減少1,175,562元,節省比例為56.23%。在耗能比較中,則可減少965,756 kJ/day,節能率達46.50%,二氧化碳排放量亦可降低167 kg/day。 The purpose of this dissertation is to investigate the optimal design of geothermal heat pump. This dissertation experimentally and mathematically investigates the performance of the geothermal heat pump system which consists of a heat pump and a borehole heat exchanger. Furthermore, optimal method for analyzing the cost influences of the life cycle of the system were developed based on different operation strategies and the capacity of the equipment (combination of heat pumps and borehole heat exchangers). For the performance of the heat pump system, the comparison between the mathematical modeling and the experimental approaches are identical. The relation of correlation R2 is about 0.9867. On the contrary, the capability of the borehole heat exchangers was investigated. The variation of the water temperature inside the cylindrical tube and the outlet water temperature in the spiral pipe were solved by using the thermal resistance method. The result shows that the error of the temperature for spiral pipe outlet and water temperature inside the cylindrical tube with compare to the mathematical model is 0.31% and 3.12%. While in the optimum design, it compares the performances of four updating rules of the particle swarm optimization (PSO) through applying five mathematic problems. The linear-decayed inertia weight method is favorable for this study because stability of solutions can be obtained. This dissertation also developed a solution for the discrete problem of the on-off system in the water pump and heat pump by using PSO with Roulette Wheel Method. Finally a case study was conducted. The geothermal heat pump system was developed in a factory in order to obtain the optimization. The primary parameters include the turn-off states of heat pump and water pump, the heat pump capacity, the UA of heat exchanger, the initial cold and heat water temperature and the capacity of cold and heat tank. The results indicated that the cost of life cycle of the geothermal heat pump system can be reduced by NT 1,446,552, the ratio of energy saving is 56.23%. The energy consumption decrement is 965,756 kJ/day, the ratio of energy saving is 46.50% and the reduction of CO2 emissions is 167 kg/day for a period of 10 years which compare to the conventional boiler combined with chiller. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16405 |
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顯示於系所單位: | 機械工程學系 |
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