【摘要】：地源熱泵技術(shù)是利用淺層地?zé)崮軄?lái)進(jìn)行建筑供熱、供冷的一種節(jié)能型空調(diào)技術(shù)，此技術(shù)隨著對(duì)建筑節(jié)能的重視而逐步得到廣泛應(yīng)用。地源熱泵系統(tǒng)分為水源與地埋管地源熱泵系統(tǒng)，由于水源熱泵技術(shù)在使用推廣中受到水資源等條件的限制，應(yīng)用局限性較大，而地埋管地源熱泵技術(shù)避免了水源熱泵的缺點(diǎn)，具有廣泛的適用性。地埋管地源熱泵技術(shù)在近幾年才得到廣泛應(yīng)用，由于地下土壤條件的復(fù)雜性，地埋管換熱器仍存在諸多問(wèn)題需要解決。 本文通過(guò)對(duì)地埋管換熱器的傳熱過(guò)程進(jìn)行分析，利用數(shù)值模擬與實(shí)驗(yàn)相結(jié)合的方法對(duì)豎直單U型、雙U型地埋管換熱器及套管式地埋管換熱器在不同流速、埋管布局、管徑匹配以及不同流程形式時(shí)的換熱性能以及上述三種地埋管的土壤溫度場(chǎng)進(jìn)行了研究。通過(guò)數(shù)值模擬及實(shí)驗(yàn)研究得出以下結(jié)論： 模擬研究表明，隨著流速的提高，地埋管換熱器的換熱量隨之增大；單U型地埋管換熱器采用管間距50mm時(shí)的換熱能力高于管間距60mm，埋管換熱器采用DN32管徑時(shí)換熱能力高于DN25管徑的單U型地埋管換熱器；雙U型地埋管換熱器采用交叉埋管形式時(shí)換熱效果優(yōu)于其它形式的埋管；套管式換熱器采用內(nèi)進(jìn)外出、同軸形式時(shí)換熱量?jī)?yōu)于采用外管進(jìn)內(nèi)管出形式的地埋管換熱器；內(nèi)管管徑為DN32時(shí)的套管式換熱器換熱能力大于內(nèi)管為DN25的套管換熱器。三種形式的地埋管換熱器模擬達(dá)到穩(wěn)定時(shí)，土壤溫度場(chǎng)的作用半徑可達(dá)到2m左右。 本課題根據(jù)數(shù)值模擬研究，從中選擇了三種最佳的地埋管換熱器形式，，即管間距60mm、DN32的單U型地埋管，交叉形式的雙U型地埋管，內(nèi)管進(jìn)外管出的同軸套管換熱器進(jìn)行了實(shí)驗(yàn)研究。實(shí)驗(yàn)表明地下3米處土壤溫度增加的幅度隨著埋管運(yùn)行時(shí)間的增長(zhǎng)而逐漸減小；隨著流速的增大，地埋管換熱器的進(jìn)出口溫差減小，但埋管換熱量卻隨流速的增大而增大。
[Abstract]:Ground-source heat pump (GSHP) technology is a kind of energy-saving air conditioning technology which uses shallow geothermal energy for building heating and cooling. This technology has been widely used with the attention to building energy conservation. The ground source heat pump system is divided into water source system and ground source heat pump system. Because the water source heat pump technology is limited by water resources and other conditions, the application of ground source heat pump technology avoids the shortcomings of water source heat pump. It has wide applicability. Ground source heat pump (GSHP) technology has been widely used in recent years. Due to the complexity of underground soil conditions, there are still many problems to be solved. In this paper, the heat transfer process of ground buried tube heat exchanger is analyzed, and the vertical single U type, double U type ground tube heat exchanger and casing type ground tube heat exchanger are arranged at different velocity and tube layout by the method of numerical simulation and experiment. The pipe diameter matching, the heat transfer performance of different flow forms and the soil temperature field of the above three buried pipes were studied. Through numerical simulation and experimental study, the following conclusions are drawn: the simulation results show that the heat transfer of the ground buried tube heat exchanger increases with the increase of the velocity of flow; The heat transfer capacity of single U type ground heat exchanger with 50mm distance is 60 mm higher than that of DN25 tube heat exchanger, and that of single U type ground tube heat exchanger with DN32 tube diameter is higher than that with DN25 tube diameter. The heat transfer effect of double U type ground heat exchanger is better than that of other types of buried tube when cross buried tube is adopted, and the heat transfer of casing type heat exchanger is better than that of outer tube in and out form, and the heat transfer of coaxial type is better than that of external tube type. The heat transfer capacity of casing heat exchanger with inner tube diameter of DN32 is greater than that with inner tube with DN25. When the simulation of three kinds of underground tube heat exchangers is stable, the action radius of soil temperature field can reach about 2m. According to the numerical simulation research, three kinds of best ground buried pipe heat exchangers are selected, that is, the single U type ground buried pipe with 60mm spacing DN32 and the double U type ground buried pipe with cross form. The coaxial casing heat exchangers with inner and outer tubes are experimentally studied. The experimental results show that the increasing amplitude of soil temperature decreases with the increase of the operating time of buried pipe and decreases with the increase of velocity of flow, but the heat transfer of buried pipe increases with the increase of velocity of flow.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU83

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊衛(wèi)國(guó);王京;;地源熱泵系統(tǒng)熱短路分析[J];建筑節(jié)能;2008年02期

2 張志瑩;;建筑節(jié)能是實(shí)現(xiàn)建筑業(yè)可持續(xù)發(fā)展的必由之路[J];中國(guó)工程咨詢;2006年07期

3 楊敏;陳穎;史保新;;地埋管換熱器非穩(wěn)態(tài)換熱性能的實(shí)驗(yàn)研究[J];廣東工業(yè)大學(xué)學(xué)報(bào);2008年02期

4 崔成根;金哲;李惟毅;;地源熱泵U型埋管數(shù)值模擬與分析[J];節(jié)能;2012年02期

5 岳玉亮;齊月松;丁千茹;;單、雙U形管地埋管換熱性能對(duì)比分析[J];建筑科學(xué);2011年08期

6 王艷;刁乃仁;王京;;U型管地?zé)釗Q熱器熱作用半徑的數(shù)值模擬[J];建筑熱能通風(fēng)空調(diào);2011年03期

7 齊承英;王華軍;王恩宇;;不同回填材料下地埋管換熱器性能的實(shí)驗(yàn)研究[J];暖通空調(diào);2010年03期

8 胡映寧;李常春;王小純;;套管式地埋管換熱器換熱性能實(shí)驗(yàn)研究[J];暖通空調(diào);2011年09期

9 于明志,方肇洪;現(xiàn)場(chǎng)測(cè)試地下巖土平均熱物性參數(shù)方法[J];熱能動(dòng)力工程;2002年05期

10 于明志,彭曉峰,方肇洪;用于現(xiàn)場(chǎng)測(cè)量深層巖土導(dǎo)熱系數(shù)的簡(jiǎn)化方法[J];熱能動(dòng)力工程;2003年05期

相關(guān)碩士學(xué)位論文 前2條

1 林久宇;重慶地區(qū)U型垂直埋管換熱器換熱特性研究[D];重慶大學(xué);2010年

2 趙家威;地源熱泵土壤換熱器溫度場(chǎng)數(shù)值模擬及技術(shù)經(jīng)濟(jì)分析[D];合肥工業(yè)大學(xué);2009年

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