不同土壤中地下水滲流速度對(duì)單U型垂直埋管換熱器性能影響的模擬研究
發(fā)布時(shí)間：2018-09-19 07:54
【摘要】：在我國(guó)現(xiàn)階段,人口與建筑密度巨大,資源消耗和所需劇增,能源供應(yīng)越來越緊張,因此,各行各業(yè)已經(jīng)開始關(guān)注建筑節(jié)能。而地源熱泵是一種既節(jié)能,又環(huán)保,還滿足可持續(xù)發(fā)展要求的系統(tǒng)。它為解決困擾我國(guó)發(fā)展中遇到的環(huán)境污染與能源危機(jī)的兩大問題帶來了契機(jī),因此地源熱泵技術(shù)的發(fā)展前景在中國(guó)將十分明朗以及廣闊。 地源熱泵的應(yīng)用研究中涉及多種參數(shù)條件,這些條件中有淺層地質(zhì)條件這一項(xiàng)。地源熱泵運(yùn)行過程中,巖土物性擔(dān)任著決定性的角色,其中包含著地下水滲流這一動(dòng)態(tài)因素,這一因素在地源熱泵的理論研究和實(shí)際應(yīng)用中均顯現(xiàn)出較大的作用影響,當(dāng)前研究者認(rèn)為地下水滲流因素是準(zhǔn)確設(shè)計(jì)地源熱泵系統(tǒng)的中心因素之一。 本文首先對(duì)地源熱泵的工作原理、組成與分類以及系統(tǒng)特點(diǎn)和國(guó)內(nèi)外現(xiàn)狀進(jìn)行了詳細(xì)的闡述說明,接著給出了傳熱基礎(chǔ)與地埋管換熱器的傳熱理論。隨后視土壤為飽和多孔介質(zhì),論述了埋管換熱器傳熱過程中考慮地下水滲流的數(shù)學(xué)模型與滲流模型。使用GAMBIT前處理器建立管內(nèi)流體、垂直U型管、與周圍土壤的熱滲耦合物理模型,然后使用FLUENT軟件進(jìn)行數(shù)值模擬計(jì)算及后處理。 本文首先研究夏季工況中無滲流情況下,埋于五種不同土壤類型(分別為致密砂土、輕質(zhì)砂土、粉質(zhì)粘土、卵石(黃岡巖等)、砂巖)中時(shí),U型埋管換熱器周圍土壤的溫度分布情況與埋管進(jìn)出口溫差。其次對(duì)五種土壤類型,不同滲流速度(100m/y,200m/y,300m/y,400m/y,500m/y,600m/y,700m/y,800m/y,900m/y,1000m/y)條件下,U型埋管換熱器周圍土壤溫度場(chǎng)分布情況以及進(jìn)出口溫差的變化進(jìn)行模擬并數(shù)據(jù)分析。 模擬結(jié)果發(fā)現(xiàn),在有滲流情況下,埋管周圍土壤溫度場(chǎng)將沿著滲流方向發(fā)生一定程度的偏移,且U型埋管換熱器的換熱效果明顯好于無滲流情況。通過對(duì)比每種類型土壤下的模擬結(jié)果,給出各自的最佳滲流速度,致密砂土、輕質(zhì)砂土、粉質(zhì)粘土、卵石(黃岡巖等)、砂巖的最佳滲流速度分別為500m/y、600m/y、800m/y,300m/y和300m/y。在最佳滲流速度下的U型埋管換熱器的進(jìn)出口溫差最大。卵巖和輕質(zhì)砂土兩種土壤的U型埋管換熱器的進(jìn)出口溫差受滲流速度影響較大,變化明顯;而砂巖、致密砂土和粉質(zhì)粘土三種土壤內(nèi)埋管進(jìn)出口溫差的曲線較為平緩,受滲流速度變化的影響較小。本文的結(jié)論對(duì)地源熱泵U型埋管換熱器的工程設(shè)計(jì)具有一定的指導(dǎo)作用。
[Abstract]:At the present stage of our country, the population and the building density are huge, the resource consumption and the need increases sharply, the energy supply is more and more tight, therefore, the various industries have begun to pay attention to the building energy saving. Ground-source heat pump is a kind of energy-saving, environmental protection, but also meet the requirements of sustainable development. It brings an opportunity to solve the two major problems of environmental pollution and energy crisis that beset the development of our country, so the development prospect of ground-source heat pump technology will be very bright and broad in China. The application of ground source heat pump involves a variety of parameter conditions, such as shallow geological conditions. In the operation of ground-source heat pump (GSHP), geotechnical properties play a decisive role, including the dynamic factor of groundwater seepage, which plays an important role in the theoretical research and practical application of GSHP. Current researchers believe that groundwater seepage is one of the central factors in the accurate design of ground source heat pump system. In this paper, the working principle, composition and classification of ground-source heat pump, the characteristics of the system and the present situation at home and abroad are described in detail, and then the heat transfer theory of the ground source heat exchanger and the heat transfer theory of the ground source heat exchanger are given. Then, considering the soil as saturated porous medium, the mathematical model and seepage model considering groundwater seepage in the heat transfer process of buried tube heat exchanger are discussed. The thermo-osmotic coupling physical model between the fluid and the vertical U-tube in the pipe was established by using the GAMBIT pre-processor, and then the numerical simulation and post-processing were carried out by using the FLUENT software. In this paper, five different types of soil (dense sand, light sand, silty clay) are studied in summer without seepage. The temperature distribution of the soil around the U-type heat exchanger in the pebble (Huanggang rock and sandstone) is different from the temperature difference between the inlet and outlet of the buried pipe. Secondly, the distribution of soil temperature field and the temperature difference between the inlet and outlet of U-type buried tube heat exchangers were simulated and analyzed under the conditions of five soil types, different seepage velocities (100m / yt ~ 300m / yy ~ (300m / y) ~ 400m / y ~ 500m / y ~ 600m / y ~ (-) and temperature difference between the inlet and outlet of U-type buried tube heat exchangers. The simulation results show that the soil temperature field around the buried pipe will deviate to a certain extent along the seepage direction under the condition of seepage, and the heat transfer effect of U-type buried tube heat exchanger is obviously better than that of no seepage. By comparing the simulation results of each type of soil, the optimal seepage velocity of each type of soil is given. The optimum seepage velocity of dense sand, light sand, silty clay, pebbles (Huanggang rock, etc.) and sandstone is 500m / yyr / 600m/ yyyyr ~ 300my and 300m/ yy, respectively. The temperature difference between the inlet and outlet of U-type buried tube heat exchanger is the largest at the optimum seepage velocity. The temperature difference at the inlet and outlet of U-tube heat exchangers in two kinds of soils, ovalite and light sandy soil, is influenced by seepage velocity and changes obviously, while the curve of inlet and outlet temperature difference of sandstone, dense sand and silty clay is relatively smooth. It is less affected by the variation of seepage velocity. The conclusion of this paper is helpful to the engineering design of U-type buried tube heat exchanger of ground source heat pump.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU83
本文編號(hào)：2249505
[Abstract]:At the present stage of our country, the population and the building density are huge, the resource consumption and the need increases sharply, the energy supply is more and more tight, therefore, the various industries have begun to pay attention to the building energy saving. Ground-source heat pump is a kind of energy-saving, environmental protection, but also meet the requirements of sustainable development. It brings an opportunity to solve the two major problems of environmental pollution and energy crisis that beset the development of our country, so the development prospect of ground-source heat pump technology will be very bright and broad in China. The application of ground source heat pump involves a variety of parameter conditions, such as shallow geological conditions. In the operation of ground-source heat pump (GSHP), geotechnical properties play a decisive role, including the dynamic factor of groundwater seepage, which plays an important role in the theoretical research and practical application of GSHP. Current researchers believe that groundwater seepage is one of the central factors in the accurate design of ground source heat pump system. In this paper, the working principle, composition and classification of ground-source heat pump, the characteristics of the system and the present situation at home and abroad are described in detail, and then the heat transfer theory of the ground source heat exchanger and the heat transfer theory of the ground source heat exchanger are given. Then, considering the soil as saturated porous medium, the mathematical model and seepage model considering groundwater seepage in the heat transfer process of buried tube heat exchanger are discussed. The thermo-osmotic coupling physical model between the fluid and the vertical U-tube in the pipe was established by using the GAMBIT pre-processor, and then the numerical simulation and post-processing were carried out by using the FLUENT software. In this paper, five different types of soil (dense sand, light sand, silty clay) are studied in summer without seepage. The temperature distribution of the soil around the U-type heat exchanger in the pebble (Huanggang rock and sandstone) is different from the temperature difference between the inlet and outlet of the buried pipe. Secondly, the distribution of soil temperature field and the temperature difference between the inlet and outlet of U-type buried tube heat exchangers were simulated and analyzed under the conditions of five soil types, different seepage velocities (100m / yt ~ 300m / yy ~ (300m / y) ~ 400m / y ~ 500m / y ~ 600m / y ~ (-) and temperature difference between the inlet and outlet of U-type buried tube heat exchangers. The simulation results show that the soil temperature field around the buried pipe will deviate to a certain extent along the seepage direction under the condition of seepage, and the heat transfer effect of U-type buried tube heat exchanger is obviously better than that of no seepage. By comparing the simulation results of each type of soil, the optimal seepage velocity of each type of soil is given. The optimum seepage velocity of dense sand, light sand, silty clay, pebbles (Huanggang rock, etc.) and sandstone is 500m / yyr / 600m/ yyyyr ~ 300my and 300m/ yy, respectively. The temperature difference between the inlet and outlet of U-type buried tube heat exchanger is the largest at the optimum seepage velocity. The temperature difference at the inlet and outlet of U-tube heat exchangers in two kinds of soils, ovalite and light sandy soil, is influenced by seepage velocity and changes obviously, while the curve of inlet and outlet temperature difference of sandstone, dense sand and silty clay is relatively smooth. It is less affected by the variation of seepage velocity. The conclusion of this paper is helpful to the engineering design of U-type buried tube heat exchanger of ground source heat pump.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU83
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