【摘要】：地源熱泵作為一項(xiàng)綠色能源技術(shù),對(duì)土壤、地下水均無(wú)污染,系統(tǒng)較為簡(jiǎn)單,能效比更高可再生能源在今天成為了重要的供熱、制冷技術(shù)。因此,大力開(kāi)展地源熱泵的技術(shù)研究與應(yīng)用推廣工作,特別是對(duì)地源熱泵換熱性能的影響因素的準(zhǔn)確分析研究,可以對(duì)于不同的環(huán)境因素選擇合適的地源熱泵系統(tǒng),對(duì)于減少我國(guó)能源消耗,減少對(duì)環(huán)境的污染都具有重要意義。地源不但是一種潔凈能源,而且可循環(huán)再生,儲(chǔ)備量豐富,對(duì)環(huán)境沒(méi)有任何破壞。在今天環(huán)境問(wèn)題和能源問(wèn)題越來(lái)越受到大眾的重視,幾乎成為了現(xiàn)階段社會(huì)發(fā)展的瓶頸,所以開(kāi)發(fā)清潔能源和可再生能源是現(xiàn)今能源應(yīng)用問(wèn)題的重中之重,利用土壤源一方面可以減少環(huán)境的污染,另一方面因?yàn)橥寥涝磧?chǔ)量巨大,可以形成新的能源供應(yīng)方式,因此在未來(lái)具有廣闊的開(kāi)發(fā)價(jià)值。對(duì)于不論民用建筑還是商用建筑土壤源熱泵的使用大多為間歇使用,研究間歇式運(yùn)行的土壤源熱泵不但可以節(jié)約能源,而且有利于土壤源熱泵的換熱效果,對(duì)其進(jìn)行模擬和分析可以直觀的了解土壤源熱泵間歇式運(yùn)行的土壤溫度場(chǎng),熱媒溫度變化,方便熱泵的設(shè)計(jì)。土壤源熱泵作為地源熱泵的一種,相比水源熱泵還沒(méi)有廣泛的應(yīng)用,但是在近些年來(lái),在政府的大力扶持下,土壤源熱泵發(fā)展迅速,并且逐漸被人們接受,土壤源熱泵的應(yīng)用成幾何增長(zhǎng)。本文在已有的土壤源熱泵研究的基礎(chǔ)上,分析了在熱泵實(shí)際運(yùn)行中的各種影響因素。例如間歇運(yùn)行、土壤中有滲水等等。本文針對(duì)土壤源熱泵地下垂直U型埋管,建立了周圍土壤的非穩(wěn)態(tài)溫度場(chǎng)的數(shù)學(xué)模型,利用FLUENT軟件進(jìn)行求解。通過(guò)對(duì)冬夏兩季制冷工況的模擬,得到了熱泵間歇運(yùn)行埋管周圍土壤溫度場(chǎng)的變化規(guī)律,不同巖土含水量對(duì)地下?lián)Q熱器周圍土壤溫度場(chǎng)的影響,不同的埋管周圍土壤滲流速度對(duì)地下?lián)Q熱器傳熱性能的影響,為土壤源熱泵系統(tǒng)長(zhǎng)期高效運(yùn)行提供了理論參考。模擬結(jié)果表明,隨著熱泵的連續(xù)運(yùn)行,埋管周圍土壤溫度場(chǎng)半徑逐步擴(kuò)大,長(zhǎng)時(shí)間運(yùn)行后,土壤熱作用半徑約為3.5m,繼續(xù)運(yùn)行變化不大,而熱效率較低。而間歇運(yùn)行不但可以節(jié)約在不需要時(shí)的能源浪費(fèi),而且可以使土壤溫度回歸,提高換熱效率。本文根據(jù)既有建筑群的土壤源熱泵的實(shí)際應(yīng)用,對(duì)比了間歇運(yùn)行與常規(guī)的連續(xù)運(yùn)行的換熱效率,為實(shí)際的地源熱泵工程作為理論依據(jù)。
[Abstract]:As a green energy technology, ground-source heat pump has no pollution to soil and groundwater. The system is simple and the energy efficiency ratio is higher. The renewable energy has become an important heating and refrigeration technology today. Therefore, the research and application of ground-source heat pump technology, especially the accurate analysis of the factors affecting the heat transfer performance of ground-source heat pump, can select suitable ground source heat pump system for different environmental factors. It is of great significance to reduce energy consumption and environmental pollution in China. Not only a clean source of energy, but also renewable, abundant reserves, no damage to the environment. Nowadays, more and more attention has been paid to environmental and energy problems, which have almost become the bottleneck of social development. Therefore, the development of clean and renewable energy is the most important issue in energy application nowadays. On the one hand, the use of soil sources can reduce environmental pollution, on the other hand, because of the huge reserves of soil sources, a new mode of energy supply can be formed, so it has broad development value in the future. For the intermittent use of ground-source heat pump in both civil and commercial buildings, the study of intermittent ground-source heat pump can not only save energy, but also benefit the heat transfer effect of ground-source heat pump. Simulation and analysis of the ground source heat pump can intuitively understand the ground temperature field of intermittent operation, heat medium temperature change, and facilitate the design of the heat pump. Ground-source heat pump (GSHP) as a kind of ground-source heat pump has not been widely used compared with water-source heat pump. However, in recent years, with the support of the government, ground-source heat pump has developed rapidly and gradually accepted by people. The application of ground source heat pump becomes geometric growth. On the basis of the existing research on ground source heat pump, this paper analyzes the influence factors in the actual operation of the heat pump. For example, intermittent operation, soil seepage and so on. In this paper, a mathematical model of the unsteady temperature field of the surrounding soil is established for the underground vertical U-shaped buried pipe of ground-source heat pump. The model is solved by FLUENT software. Through the simulation of the cooling conditions in winter and summer, the variation law of soil temperature field around the buried pipe in intermittent operation of heat pump is obtained, and the influence of different rock and soil moisture content on the soil temperature field around the underground heat exchanger is obtained. The influence of different soil seepage velocities around buried pipes on the heat transfer performance of underground heat exchangers provides a theoretical reference for the long-term efficient operation of ground-source heat pump systems. The simulation results show that with the continuous operation of the heat pump, the radius of the soil temperature field around the buried pipe expands gradually. After long time operation, the soil thermal action radius is about 3.5 m, and the continuous operation has little change, but the thermal efficiency is low. Intermittent operation can not only save energy waste when not needed, but also make soil temperature return and improve heat transfer efficiency. According to the practical application of ground source heat pump in existing buildings, this paper compares the heat transfer efficiency between intermittent operation and conventional continuous operation, which is the theoretical basis for the actual ground source heat pump engineering.
【學(xué)位授予單位】：沈陽(yáng)建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU831

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