本文選題：土壤源熱泵　切入點：地埋管換熱器　出處：《青島理工大學(xué)》2013年碩士論文

【摘要】：近年來，土壤源熱泵由于其節(jié)能、環(huán)保、高效等優(yōu)點，得到越來越廣泛的應(yīng)用。然而隨著土壤源熱泵運行時間的延續(xù)，由冷熱負(fù)荷不平衡及土壤溫度不能及時恢復(fù)而造成的熱堆積對熱泵系統(tǒng)的影響越來越顯著，甚至導(dǎo)致部分熱泵系統(tǒng)失去運行能力。因此，本文對土壤熱恢復(fù)特性進行了研究，主要工作如下： 1、建立單井及井群的有限元傳熱模型，并結(jié)合已測得的實驗數(shù)據(jù)，分別對夏季和過渡季（秋季）的土壤溫度變化進行對比分析，，發(fā)現(xiàn)夏季實測值和模擬值的最大相對誤差為11%，平均相對誤差為3%；過渡季（秋季）最大相對誤差為0.12%，驗證模型的正確性。 2、利用實驗臺進行了連續(xù)三年的實驗測試。研究發(fā)現(xiàn)，實驗工況輸入土壤的累計冷熱負(fù)荷不平衡率達到73%，而運行兩年之后土壤溫度僅降低了0.6℃，管壁處土壤熱恢復(fù)的主要時期為春秋過渡季節(jié)。第三年停機一年后土壤溫度基本恢復(fù)至初始溫度。 3、利用建立的傳熱模型，分別分析了土壤導(dǎo)熱系數(shù)、密度、比熱、導(dǎo)溫系數(shù)、間歇運行和延米換熱量對土壤熱恢復(fù)特性的影響，發(fā)現(xiàn)土壤的導(dǎo)溫系數(shù)和導(dǎo)熱系數(shù)是影響土壤熱恢復(fù)特性的關(guān)鍵因素，土壤的密度、比熱、間歇運行工況和延米換熱量都對土壤的熱恢復(fù)具有一定的影響。 4、利用井群模型分析了連續(xù)運行和間歇運行工況砂巖土質(zhì)時井群的熱恢復(fù)特性，得到了在兩種工況下砂巖的土壤溫度可恢復(fù)范圍。 本文的研究有助于解決土壤熱恢復(fù)的問題，提供不同運行模式下土壤溫度可恢復(fù)范圍，為土壤源熱泵系統(tǒng)的設(shè)計提供一定的參考。
[Abstract]:In recent years, ground source heat pump (GSHP) has been more and more widely used because of its advantages of energy saving, environmental protection, high efficiency and so on. The heat accumulation caused by the imbalance of cold and heat load and the inability of soil temperature to recover in time have more and more significant effects on the heat pump system, and even lead to the loss of operation capacity of some heat pump systems. Therefore, the characteristics of soil thermal recovery are studied in this paper. The main tasks are as follows:. 1. The finite element heat transfer model of single well and well group is established, and the soil temperature changes in summer and transition season (autumn) are compared and analyzed by combining the measured experimental data. It is found that the maximum relative error between the measured value and the simulated value in summer is 11, the average relative error is 3, and the maximum relative error in the transition season (autumn) is 0.12, which verifies the correctness of the model. 2. Three consecutive years of experimental tests were carried out on the experimental bench. It was found that the unbalance rate of the accumulated heat and cold load in the input soil under the experimental conditions reached 73%, but the soil temperature decreased only 0.6 鈩

本文編號：1685914