本文選題：混合式土壤源熱泵系統(tǒng) + 冷卻塔控制策略�。� 參考：《華中科技大學(xué)》2013年碩士論文

【摘要】：地源熱泵系統(tǒng)以其節(jié)能、環(huán)保、高效的特點得到了越來越廣泛的應(yīng)用。在以武漢為典型城市的夏熱冬冷地區(qū)，由于夏季冷負荷大于冬季熱負荷，為了保持土壤的熱平衡，采用的是地埋管+冷卻塔的混合式土壤源熱泵系統(tǒng)形式。 對于混合式土壤源熱泵系統(tǒng)，地埋管和冷卻塔的匹配運行成為了一個難點。冷卻塔開啟時間過多，冷卻塔環(huán)路會消耗大量的能源，冷卻塔開啟時間過少，則會導(dǎo)致熱泵進口流體溫度升高、土壤溫度升高、熱泵機組性能下降，同樣也會造成系統(tǒng)能耗的升高，同時，何時開啟冷卻塔也是一個關(guān)鍵。因此，如何對冷卻塔進行運行控制，使得混合式土壤源熱泵系統(tǒng)長期高效的運行是一個非常值得研究的問題。 本文以武漢某酒店建筑為研究對象，在TRNSYS平臺下建立混合式土壤源熱泵系統(tǒng)模型。針對熱泵進、出口流體最高溫度控制策略、溫差控制策略分別選取了多個控制工況點進行了20年的仿真模擬，，得出了這四種策略下的最優(yōu)控制工況點。并對這四種策略的最優(yōu)控制工況點進行了比較分析，結(jié)果表明，采用最高溫度控制策略時，對熱泵進口流體溫度進行控制更優(yōu)；而采用溫差控制策略時，對熱泵出口流體溫度進行控制更優(yōu)。 然后，在此研究結(jié)論的基礎(chǔ)上提出了一種新的控制策略，即對熱泵進口流體進行最高溫度控制，而對熱泵出口流體進行溫差控制的綜合控制策略，并對其選取了25個控制工況點進行了仿真模擬，找到其最優(yōu)控制工況點。 最后，用上面得到的三種最優(yōu)控制策略與傳統(tǒng)的控制策略進行比較，結(jié)果表明：熱泵進、出口流體溫度采用綜合控制策略時，熱泵系統(tǒng)全生命周期（20年）的總能耗最��；熱泵出口流體溫度采用溫差控制策略時土壤的最大平均溫度的增加最小。
[Abstract]:Ground-source heat pump system has been more and more widely used because of its energy saving, environmental protection and high efficiency. In the hot summer and cold winter region with Wuhan as the typical city, because the cooling load in summer is larger than the heat load in winter, in order to maintain the heat balance of soil, the hybrid ground source heat pump system with ground buried pipe cooling tower is adopted. For hybrid ground source heat pump system, the matching operation of buried pipe and cooling tower becomes a difficulty. If the cooling tower has too much open time, the cooling tower loop will consume a lot of energy. If the cooling tower starts too little, it will cause the heat pump inlet temperature to rise, the ground temperature to rise, and the performance of the heat pump unit to decline. It also leads to higher energy consumption, and when the cooling tower is opened is a key. Therefore, how to control the cooling tower and make the hybrid ground source heat pump system run efficiently for a long time is a problem worth studying. Based on a hotel building in Wuhan, a hybrid ground source heat pump system model based on TRNSYS is established in this paper. Aiming at the maximum temperature control strategy and temperature difference control strategy of heat pump flow in and out of the water, several control working conditions were selected for 20 years' simulation, and the optimal control operating conditions were obtained under these four strategies. The results show that it is better to control the inlet temperature of the heat pump with the maximum temperature control strategy, while the temperature difference control strategy is better than that of the temperature difference control strategy. It is better to control the fluid temperature at the outlet of the heat pump. Then, based on the conclusion of the study, a new control strategy is proposed, that is, the maximum temperature control for the inlet fluid of the heat pump, and the comprehensive control strategy for the temperature difference control of the flow at the outlet of the heat pump. The 25 control conditions are simulated and the optimal control conditions are found. Finally, compared with the traditional control strategy, the results show that the total energy consumption of the whole life cycle (20 years) of the heat pump system is the least when the temperature of the inlet and outlet fluid is controlled by the integrated control strategy. The maximum average temperature of the soil is minimum when the temperature of the outlet fluid is controlled by temperature difference.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU83

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