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1、天津大學(xué)碩士學(xué)位論文U型管樁埋換熱器傳熱理論模擬與實(shí)驗(yàn)研究姓名:龔宇烈申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):熱能工程指導(dǎo)教師:趙軍20030101中文摘要本文對(duì)U型管樁埋換熱器進(jìn)行了傳熱機(jī)理和實(shí)驗(yàn)研究。在分析三種傳熱模型的基礎(chǔ)上,通過引入U(xiǎn)型埋管管腳熱影響因子,建立土壤層內(nèi)u型埋管換熱器的物理和數(shù)學(xué)模型;結(jié)合實(shí)際工程應(yīng)用,通過編制計(jì)算機(jī)程序,重點(diǎn)研究了u型管樁埋換熱器的傳熱規(guī)律,計(jì)算結(jié)果揭示了u型管樁埋換熱器熱輸出與出口溫度的變化規(guī)律及換熱器周圍土壤的溫度變化規(guī)律。此外,本文還探討了土壤熱濕遷移過程,分析得到的部分結(jié)論能更合理地指導(dǎo)
2、埋管換熱器的設(shè)計(jì)。本文建立了u型管樁埋換熱器的實(shí)驗(yàn)臺(tái),利用數(shù)據(jù)采集系統(tǒng)對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行實(shí)時(shí)采集。實(shí)驗(yàn)分析了循環(huán)流量、進(jìn)I:l溫度對(duì)u型管樁埋換熱器換熱性能的影響,通過短期連續(xù)運(yùn)行,得到了樁埋換熱器的熱輸出變化以及周圍土壤的溫度分布,實(shí)驗(yàn)還比較了單樁單管和單樁雙管的換熱情況以及不同回填物對(duì)埋管換熱器熱輸出的影響。實(shí)驗(yàn)結(jié)果與理論分析得到的結(jié)果一致,從而驗(yàn)證了傳熱模型的正確性。關(guān)鍵詞:地源熱泵U型管樁埋換熱器管腳熱影響因子熱濕遷移ABSTRACTT}Iispaperpresentsatheoreticalandexperime
3、ntalinvestigationoftheU—pipepileheatexchanger.Onthebasisoftheanalysisofthreegroundheatexchangermodels,physicalandmathematicalmodelsfortheU—pipeheatexchangerinthesoilhavebeenestablished.、耐thconsiderationofthermalinterferenceofpipelegs.Basedupontheapplication,comp
4、uterprogramshavebeendevelopedtocalculatetheheattransferoftheU—pipepileheatexchanger.Thelawsaboutheatoutputandexitingfluidtemperatureoftheheatexchanger,andthetemperaturedistributionofambientsoil,havebeenrevealedbythecomputedresults.Besides,heatandmoisturetransfer
5、inmoistsoilhavebeendiscussed,whichdemonstratesthattheheatexchangermodelconsideringheatandmoisturetransferisfitforguidingthedesignofU-pipepileheatexchanger.nlein—situtestdeviceoftheU—pipepileheatexchangerisbuiltupinthispaper,thedataalecollectedrealtimebythecollec
6、ting·datasystem.neperformanceoftheheatexchangerunderdifferentfloworenteringfluidtemperatureisanalysed.Undertheshort—timecontinuousrunning,heatoutputoftheheatexchangerandthetemperaturedistributionofambientsoilaleobtained.Therealecomparisonoftheperformancebetweens
7、inglepipeinonepileanddoublepipesinonepile,anddifferentgroutsaffectorlheatoutputoftheheatexchanger.Goodagreementisobtainedbetweenthetheoreticalsolutionandtheexperimentaldata,thereliabilityofthemodeliSverified.Keywords:GroundsonrceheatpumpU-pipepileheatexchangerTh
8、ermalinterferenceofpipelegsHeatandmoisturetransfer獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作和取得的研究成果,除了文中特別加以標(biāo)注和致謝之處外,論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果,也不包含為獲得吞洼盤鱟或其他教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我