發(fā)布時(shí)間：2019-05-28 18:20

【摘要】：地源熱泵系統(tǒng)作為一項(xiàng)節(jié)能環(huán)保的技術(shù),越來越被人們所熟知,可以有效的解決一些國家的能源危機(jī)、提高能源使用率。目前,國內(nèi)外關(guān)于地源熱泵技術(shù)方面研究的熱門課題之一是地源熱泵系統(tǒng)在不同地區(qū)、不同氣候條件下的適用性問題。 本課題主要做了以下研究工作： 1.分析土壤源熱泵系統(tǒng)地埋管換熱器的傳熱機(jī)理,為TRNSYS模擬軟件模擬系統(tǒng)運(yùn)行奠定理論基礎(chǔ)； 2.以TRNSYS模擬軟件為平臺(tái),建立整個(gè)土壤源熱泵系統(tǒng)模型,逐時(shí)分析建筑物的動(dòng)態(tài)負(fù)荷變化,得出建筑物所需的冷熱負(fù)荷。研究系統(tǒng)化土壤源熱泵系統(tǒng)設(shè)計(jì)方法,并通過實(shí)際運(yùn)行的項(xiàng)目檢測數(shù)據(jù),分析整個(gè)系統(tǒng)的運(yùn)行情況； 3.利用TRNSYS模擬軟件,研究在不同氣候區(qū),針對(duì)寒冷和夏熱冬冷氣候區(qū),尋找兩個(gè)典型城市—西安和無錫,研究地埋管換熱器側(cè)進(jìn)出水溫度的限值問題； 4.采用費(fèi)用年值法,分析經(jīng)濟(jì)性,尋找機(jī)組最大出力,耗功最小,經(jīng)濟(jì)最合理時(shí)候,所對(duì)應(yīng)的地埋管換熱器側(cè)進(jìn)出水溫度的限值,提高土壤源熱泵系統(tǒng)效率,對(duì)系統(tǒng)進(jìn)行優(yōu)化分析。 本課題通過理論分析,試驗(yàn)數(shù)據(jù)和模擬分析,得出以下主要結(jié)論： 1.地埋管換熱器的地下傳熱是一個(gè)復(fù)雜的過程,地埋管換熱器中的循環(huán)液在土壤中是一個(gè)非穩(wěn)態(tài)傳熱過程,推導(dǎo)出蓄熱器中某一節(jié)點(diǎn)的溫度表達(dá)式； 2.通過巖土熱響應(yīng)測試,可知在上海和無錫地區(qū)土壤的初始溫度較高,而西安地區(qū)的土壤初始溫度較低。在上海和無錫地區(qū),建筑物的冷熱負(fù)荷不平衡,夏季冷負(fù)荷明顯多余冬季熱負(fù)荷,這與室外氣象條件有關(guān),在土壤源熱泵系統(tǒng)設(shè)計(jì)過程中,需要添加輔助熱源—冷卻塔,以保證地埋管側(cè)吸排熱量相等。 3.在寒冷氣候區(qū)的西安市,對(duì)比分析不同地埋管換熱器進(jìn)出口水溫的限定值,通過分析能耗和經(jīng)濟(jì)性,費(fèi)用年值最小的即為最佳溫度限值。所以,在寒冷氣候區(qū),冬季工況地埋管換熱器最佳進(jìn)口溫度宜在5℃以上,而夏季工況地埋管換熱器出口溫度適宜在32℃以下； 4.在夏熱冬冷氣候區(qū)的無錫市,機(jī)組出力最大和費(fèi)用年值最小所對(duì)應(yīng)的夏季工況下地埋管換熱器出口的最佳溫度宜在31℃以下,而冬季工況地埋管換熱器進(jìn)口溫度適宜在4.5℃以上。
[Abstract]:As an energy saving and environmental protection technology, ground source heat pump system is more and more well known, which can effectively solve the energy crisis and improve the energy utilization rate in some countries. At present, one of the hot topics in the field of ground source heat pump technology at home and abroad is the applicability of ground source heat pump system in different areas and different climatic conditions. The main research work of this subject is as follows: 1. The heat transfer mechanism of ground source heat pump system is analyzed, which lays a theoretical foundation for the operation of TRNSYS simulation software. Based on TRNSYS simulation software, the whole ground source heat pump system model is established, the dynamic load change of the building is analyzed time by time, and the cold and heat load of the building is obtained. The design method of systematic ground source heat pump system is studied, and the operation of the whole system is analyzed through the test data of the actual operation project. Using TRNSYS simulation software, this paper studies the limit value of inlet and outlet water temperature on the side of buried pipe heat exchanger in different climate areas, aiming at cold and hot summer and cold winter climate areas, Xi'an and Wuxi. The annual cost method is used to analyze the economy, to find out the maximum output of the unit, the least power consumption and the most reasonable economy, and the corresponding limit value of the inlet and outlet water temperature on the side of the buried pipe heat exchanger is used to improve the efficiency of the ground source heat pump system. The system is optimized and analyzed. Through theoretical analysis, experimental data and simulation analysis, the following main conclusions are drawn: 1. The underground heat transfer of underground pipe heat exchanger is a complex process. The circulating liquid in the underground pipe heat exchanger is an unstable heat transfer process in the soil, and the temperature expression of a node in the heat accumulator is derived. Through the test of geotechnical thermal response, it can be seen that the initial temperature of soil is higher in Shanghai and Wuxi area, but lower in Xi'an area. In Shanghai and Wuxi areas, the cooling load of buildings is unbalanced, and the cooling load in summer is obviously redundant in winter, which is related to outdoor meteorological conditions. In the design process of ground source heat pump system, it is necessary to add auxiliary heat source cooling tower. To ensure that the side suction and exhaust heat of the buried pipe is equal. 3. In Xi'an, in the cold climate area, the limit values of the inlet and outlet water temperature of different buried pipe heat exchangers are compared and analyzed. By analyzing the energy consumption and economy, the minimum annual cost is the best temperature limit. Therefore, in the cold climate area, the optimum inlet temperature of the buried pipe heat exchanger in winter condition should be above 5 鈩，

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