本文選題：地源熱泵　切入點：冷熱負荷不平衡率　出處：《東華大學》2013年碩士論文　論文類型：學位論文

【摘要】：地埋管地源熱泵系統(tǒng)依靠地埋管換熱器從地下土壤中獲取能量,雖然熱泵機組的熱源和熱匯都是地埋管周圍擴散半徑范圍內(nèi)的土壤,但由于氣候差異,地埋管換熱器夏季累計向土壤的放熱量與冬季累計從土壤的取熱量往往不一致,長期取熱量與放熱量不平衡會造成土壤溫度不斷偏離初始溫度,并導致地源熱泵系統(tǒng)運行效率逐年下降,這個問題已經(jīng)引起各界對地源熱泵技術(shù)長期運行效果的擔心和關(guān)注。 本文首先分析了建筑物冷熱負荷的特性,不同功能的建筑由于使用時間、人員密度、散熱設(shè)備開啟時間等因素不同,其負荷總量、負荷強度和負荷的持續(xù)時間都是不同的,在地源熱泵系統(tǒng)中,建筑的負荷特性決定了地埋管換熱器的工作時間、熱量累積、換熱強度,直接影響地埋管換熱器的換熱性能。 其次,通過分析幾種常用的地埋管換熱器傳熱模型,系統(tǒng)地闡述土壤溫度場的模擬方法,并采用DST模型建立了地埋管換熱器傳熱數(shù)學模型,模擬計算地埋管換熱器與土壤之間的傳熱問題,研究地埋管區(qū)域土壤溫度的變化情況。 然后,以學院實驗室部分房間為對象,設(shè)計地源熱泵系統(tǒng)、地埋管換熱器和數(shù)據(jù)采集處理系統(tǒng)等,搭建了實驗平臺,實驗研究負荷變化對土壤溫度的影響,并驗證了地埋管換熱器傳熱模型模擬計算的準確性。 最后,以間歇負荷特性的辦公建筑和連續(xù)負荷特性的賓館建筑為例,模擬計算這兩類建筑的地源熱泵系統(tǒng)在相同氣候條件下的長期運行性能,研究地埋管換熱器周圍土壤溫度的變化,通過分析得到：從全年土壤熱平衡角度考慮,在主要考慮建筑負荷總量影響時,松江地區(qū)辦公建筑地源熱泵系統(tǒng)所能承受的冷熱負荷不平衡率為26%,賓館建筑所能承受的冷熱負荷不平衡率為16%。 可見,如果建筑冷熱負荷不平衡超過土壤自身對熱量的擴散能力,就會引起土壤熱失衡,不同功能的建筑由于負荷特性不同,土壤所能承受的冷熱負荷不平衡率是不同的,因此,在設(shè)計時有必要對建筑的負荷特性進行分析,以論證在項目當?shù)氐乃牡刭|(zhì)和氣象條件下系統(tǒng)所能承受的冷熱負荷不平衡率,否則要采取相應的優(yōu)化措施。
[Abstract]:Ground source heat pump system relies on underground heat exchanger to obtain energy from underground soil. Although the heat source and heat sink of heat pump unit are both the soil in the range of diffusion radius around the buried pipe, but because of the climate difference, The accumulated heat release from the soil in summer is often inconsistent with that from the soil in winter, and the long-term imbalance between heat removal and heat release will cause the soil temperature to deviate from the initial temperature continuously. The operation efficiency of ground-source heat pump system has been decreased year by year, which has caused concern and concern about the long-term operation effect of ground-source heat pump technology. In this paper, the characteristics of cooling and heat load of buildings are analyzed firstly. Because of the different factors such as service time, personnel density, opening time of heat dissipation equipment, the total load, the load intensity and the load duration are different in different function buildings. In the ground source heat pump system, the load characteristics of the building determine the working time, heat accumulation and heat transfer intensity of the ground buried tube heat exchanger, which directly affect the heat transfer performance of the ground buried tube heat exchanger. Secondly, by analyzing several commonly used heat transfer models of underground tube heat exchanger, the simulation method of soil temperature field is described systematically, and the mathematical model of heat transfer of ground buried tube heat exchanger is established by using DST model. The heat transfer between the ground heat exchanger and the soil is simulated and the variation of soil temperature in the buried pipe area is studied. Then, taking some rooms in the laboratory of the college as the object, the ground source heat pump system, the ground heat exchanger and the data acquisition and processing system are designed, and the experimental platform is built to study the influence of the load change on the soil temperature. The accuracy of heat transfer model simulation is verified. Finally, taking office buildings with intermittent load characteristics and guesthouse buildings with continuous load characteristics as examples, the long-term operating performance of the ground-source heat pump system of these two buildings under the same climatic conditions is simulated and calculated. The variation of soil temperature around ground buried tube heat exchangers is studied. From the point of view of soil heat balance throughout the year, the influence of total building load on soil temperature is mainly considered. The unbalance rate of heat and cold load of office buildings in Songjiang area is 26 and that of hotel buildings is 16. It can be seen that if the unbalance of cold and heat load in buildings exceeds the capacity of heat diffusion of soil itself, it will cause the imbalance of soil heat and heat. Because of the different load characteristics of different buildings, the unbalance rate of cold and heat load that soil can bear is different. Therefore, it is necessary to analyze the load characteristics of the building in order to demonstrate the unbalance rate of cooling and heat load that the system can withstand under the local hydrogeological and meteorological conditions of the project, otherwise, corresponding optimization measures should be taken.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU831

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