本文選題：土壤源熱泵 + 熱物性參數(shù)��； 參考：《湖南大學(xué)》2014年碩士論文

【摘要】：土壤源熱泵空調(diào)系統(tǒng)作為一種綠色節(jié)能、低碳環(huán)保的空調(diào)系統(tǒng)形式在建筑領(lǐng)域的應(yīng)用已經(jīng)越來越普遍。地埋管換熱器設(shè)計(jì)是土壤源熱泵設(shè)計(jì)的關(guān)鍵步驟，，準(zhǔn)確的測(cè)試出工程所在地巖土熱物性參數(shù)是地埋管換熱器設(shè)計(jì)的前提與保證。本文針對(duì)土壤熱物性測(cè)試的相關(guān)問題，主要就以下幾個(gè)方面進(jìn)行了一系列的分析研究。 首先，本文對(duì)巖土熱物性的測(cè)試方法與數(shù)據(jù)處理方式進(jìn)行了比較分析，總結(jié)出了一種適用于工程運(yùn)用的推薦方法。這種方法建立在熱響應(yīng)測(cè)試的基礎(chǔ)上，先計(jì)算出巖土綜合導(dǎo)熱系數(shù)，再利用雙參數(shù)估計(jì)法計(jì)算出鉆孔內(nèi)熱阻以及巖土熱擴(kuò)散系數(shù)。 其次，針對(duì)本文推薦的巖土熱物性參數(shù)計(jì)算方法，對(duì)可能引起測(cè)試誤差的各個(gè)因素進(jìn)行了分析。研究得出初始地溫測(cè)試偏差0.5℃，鉆孔內(nèi)熱阻的偏差會(huì)達(dá)到6.5%，鉆孔夏季單位管長換熱量平均偏差2.5%，冬季單位管長換熱量平均偏差7.5%。巖土綜合導(dǎo)熱系數(shù)隨加熱功率測(cè)量值增大而增大，加熱功率測(cè)量值每偏差100W，鉆孔內(nèi)熱阻平均減小0.01m k/W，鉆孔夏季單位管長換熱量偏差約為1.9%，鉆孔冬季單位管長換熱量偏差為2.0%。另外本文通過對(duì)不同測(cè)試時(shí)間長度測(cè)試數(shù)據(jù)的計(jì)算，推薦在實(shí)際工程中測(cè)試時(shí)間長度不小于36個(gè)小時(shí)。 此外針對(duì)傳統(tǒng)的測(cè)試結(jié)果表達(dá)方式，本文引入了矩形波階躍負(fù)荷與疊加原理，并驗(yàn)證了這一換熱模型的準(zhǔn)確性。結(jié)合這一換熱模型本文提出了一種將熱物性參數(shù)直接運(yùn)用于地埋管換熱器長度設(shè)計(jì)的公式。 最后本文研究了測(cè)試過程中斷電現(xiàn)象，作者運(yùn)用參數(shù)估計(jì)法，在矩形波階躍負(fù)荷和疊加原理組合而成的換熱模型的基礎(chǔ)上，忽略等待過程直接重新測(cè)量。用這種方法計(jì)算出了測(cè)試井?dāng)嚯娗闆r下的巖土熱物性參數(shù)，并對(duì)此方法進(jìn)行了驗(yàn)證。本文認(rèn)為這種方法計(jì)算出來的巖土熱物性參數(shù)能滿足工程精度要求，很具有實(shí)際意義與實(shí)用價(jià)值。
[Abstract]:As a kind of green energy saving, low carbon environmental protection air conditioning system, the application of ground source heat pump air conditioning system in the field of construction has become more and more common. The design of ground buried tube heat exchanger is a key step in the design of ground source heat pump. It is the premise and guarantee of the design of ground buried tube heat exchanger to accurately test the geotechnical thermal properties of the site of the project. In this paper, a series of analysis and research on the following aspects were carried out in order to solve the related problems of soil thermal properties test. Firstly, this paper compares and analyzes the methods of testing and data processing of geotechnical thermal properties, and summarizes a recommended method for engineering application. Based on the test of thermal response, the comprehensive thermal conductivity of rock and soil is calculated firstly, and then the thermal resistance and thermal diffusion coefficient of rock and soil are calculated by using the method of two-parameter estimation. Secondly, the factors which may cause the measurement error are analyzed according to the calculation method of the geotechnical thermal physical parameters recommended in this paper. The results show that the deviation of thermal resistance in borehole reaches 6.5 when the initial deviation of ground temperature is 0.5 鈩

本文編號(hào)：2095593