- 學位論文
廢熱驅動吸收式儲冰水空調系統最佳化設計與運轉模擬分析
Optimal Design and Operation Simulation Analysis of Absorption Chill Water Storage Air Condition System Driven by Waste Heat
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摘要
在能源價格上漲與全球氣溫暖化的危機下，節約能源與減少二氧化碳排放兩大議題成為了工程界致力的目標。所以利用鋼鐵廠製程時所產生的廢熱動吸收式冰水主機，不僅可以有效利用廢熱空氣，達到「節能減碳」的效果，還可以提供多於的冷水給其他製程或辦公室空調使用。 本文首先提出一最佳化設計方法，使系統之初始成本與10年間的運轉能源成本總和為最低，達到經濟及節能的目的。接著建立空調系統中各主要設備的耗能計算方式，包括吸收式冰水主機、廢熱交換器、風機與水泵、冷卻水塔等，預測出該設備在不同操作條件下的性能表現。另外為求得儲冰水槽的內部溫度分佈與儲冷、釋冷性能表現，利用套裝軟體FLUENT模擬計算。 將上述研究整合後，將可提出系統整體耗能模擬計算的流程，藉此可在考慮大氣溫度、空調負載的情況下，模擬該系統於不同節能控制策略下，系統的總耗能量與各設備運轉狀況，以比較不同控製策略可達成之節能效果，並提出最佳的吸收式儲冷冰水系統運轉策略，找到系統最佳操作點，進行節能效益評估，達到節約能源的目的。以本文所提出的節能效益評估為例，若控制冷卻水入口水溫為32 OC、熱水入口水溫為105 OC、和標稱狀態比較，則可有效節省空調系統一日總耗電量約6.7%。
並列摘要
Under the threat of global warming and rising energy costs, to limit recourses spending and to reduce CO2 release are two tasks engineers have long been aiming for. The use of absorption refrigerators which operate by utilizing the waste heat factories produce can not only apply the waste heat efficiently but also achieve ‘saving energy’, moreover, it provides additional cold water for other usages and air conditioning for office buildings. In this article, an optimal design is proposed to minimize the sum cost of initial cost and the operation energy costs in ten years to meet both economic and energy requirements. Various power consumption calculation methods of the main devices are included, such as the absorption refrigerator, waste heat exchanger, fan, pump and cooling tower to predict the performance of this equipment under different operating conditions. In addition, FLUENT is used to calculate the inner temperature distribution of the chilled water storage tank and its storage discharge performance. After the integration of above research, an overall system energy process calculation method is present; it allows calculating total power consumption of the system and all operating conditions of the devices in different energy control strategies. Taking the considerations of atmospheric temperature and cooling load, this method is to compete and to find out the best absorption refrigeration water storage system strategy in order to operate an energy efficiency assessment. Take the example of the energy efficiency assessment in this article, if the entry control cool water is 32oC and the hot water entry temperature is 105oC, to compare it with it's nominal state it can efficiently lower the energy consumption approximately 6.7% during twenty four hours.
參考文獻
[12] 張峻銓，2007，”冰水主機與冷卻水塔群組最佳化運轉策略研究”，碩士論文，國立台灣大學機械工程學研究所。
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