本文關(guān)鍵詞： 最小熱阻力 均勻化方法 熱阻網(wǎng)絡(luò) 等效導(dǎo)熱系數(shù) �；⒅楸厣皾{ 有限元模擬　出處：《湖南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：玻化微珠保溫砂漿具有優(yōu)越的保溫性能和較好的物理力學(xué)性能，因而在建筑節(jié)能領(lǐng)域的應(yīng)用日趨廣泛。工程應(yīng)用上衡量�；⒅楸厣皾{的主要技術(shù)性能指標(biāo)是導(dǎo)熱系數(shù)。因此，本文針對(duì)�；⒅楸厣皾{導(dǎo)熱系數(shù)開展研究，建立理論模型、進(jìn)行理論計(jì)算，并進(jìn)行了實(shí)驗(yàn)驗(yàn)證。 首先，本研究運(yùn)用均勻化方法建立了玻化微珠保溫砂漿單元胞體，根據(jù)橫向熱阻的不同將單元胞體劃分成兩種熱阻網(wǎng)絡(luò)，，基于最小熱阻力法則推導(dǎo)了兩種熱阻網(wǎng)絡(luò)等效導(dǎo)熱系數(shù)計(jì)算公式。通過計(jì)算發(fā)現(xiàn)單元體熱阻網(wǎng)絡(luò)的劃分方式對(duì)等效導(dǎo)熱系數(shù)的計(jì)算結(jié)果有很大的影響。 然后，應(yīng)用ANSYS有限元軟件模擬了導(dǎo)熱系數(shù)測量方法——防護(hù)熱板法，得到了單元體精確導(dǎo)熱系數(shù)值。用ANSYS有限元軟件模擬玻化微珠保溫砂漿二維單元胞體的熱傳導(dǎo)過程，從得到的二維單元溫度云圖和熱流矢量圖分析了兩種熱阻網(wǎng)絡(luò)模型計(jì)算值與有限元模擬值偏差來源，并對(duì)熱阻網(wǎng)絡(luò)模型進(jìn)行了改進(jìn)，將改進(jìn)后的熱阻網(wǎng)絡(luò)模型計(jì)算值與有限元模擬值及實(shí)驗(yàn)值對(duì)比，結(jié)果均顯示改進(jìn)后的熱阻網(wǎng)絡(luò)模型比原來的兩種熱阻網(wǎng)絡(luò)模型計(jì)算精度更高。 第三，用正交試驗(yàn)的方差分析，分析了除�；⒅橥馄渌M分摻量對(duì)�；⒅楸厣皾{導(dǎo)熱系數(shù)的影響，得到了各因素對(duì)�；⒅楸厣皾{導(dǎo)熱系數(shù)大小的影響順序?yàn)榘l(fā)泡劑用量＞粉煤灰取代水泥量＞可再分散性乳膠粉用量的結(jié)論。 最后，考慮到孔隙對(duì)導(dǎo)熱系數(shù)影響較大，本研究針對(duì)加入引氣劑或發(fā)泡劑的�；⒅楸厣皾{提出了一種以改進(jìn)的熱阻網(wǎng)絡(luò)模型為基礎(chǔ)的新模型。新模型忽略其他組分摻量的影響，增加孔隙率為一變量，將玻化微珠保溫砂漿看成是由孔隙、�；⒅椤⑺嗷w組成的三元體系。經(jīng)實(shí)驗(yàn)驗(yàn)證，當(dāng)模型的孔隙率含量在10%以內(nèi)時(shí)，采用新模型計(jì)算的導(dǎo)熱系數(shù)誤差可控制在5%以內(nèi)。
[Abstract]:Vitrified microbead insulation mortar has excellent thermal insulation performance and better physical and mechanical properties. Therefore, it is widely used in the field of building energy conservation. The main technical performance index of glass microbead thermal insulation mortar is thermal conductivity in engineering application. In this paper, the thermal conductivity of vitrified microbead thermal insulation mortar is studied, the theoretical model is established, the theoretical calculation is carried out, and the experimental results are verified. Firstly, the cell body of vitrified microbead thermal insulation mortar is established by using homogenization method, and the cell body is divided into two kinds of thermal resistance networks according to the different transversal thermal resistance. Based on the principle of minimum thermal resistance, two formulas for calculating the equivalent thermal conductivity of thermal resistance network are derived. It is found that the partition of the thermal resistance network of the unit body has a great influence on the calculation results of the equivalent thermal conductivity. Then, ANSYS finite element software is used to simulate the thermal conductivity measurement method-the protective hot plate method. ANSYS finite element software was used to simulate the heat conduction process of the two-dimensional cell body of the vitrified microbead thermal insulation mortar. The source of the deviation between the calculated values of the two kinds of thermal resistance network model and the finite element simulation value is analyzed from the two-dimensional element temperature cloud diagram and the heat flux vector diagram, and the thermal resistance network model is improved. The calculated value of the improved thermal resistance network model is compared with the finite element simulation value and the experimental value. The results show that the improved thermal resistance network model is more accurate than the original two thermal resistance network models. Thirdly, with the analysis of variance of orthogonal test, the influence of the addition of other components on the thermal conductivity of the thermal insulation mortar is analyzed. It is concluded that the influence of various factors on the thermal conductivity of vitrified microbead insulation mortar is as follows: the amount of foaming agent > the amount of fly ash replacing cement > the amount of redispersible latex powder. Finally, considering that the porosity has a great influence on the thermal conductivity. In this paper, a new model based on the improved thermal resistance network model is proposed for the glass microbead insulation mortar with air entraining agent or foaming agent. The new model ignores the effect of other components. The increase of porosity is a variable, and the thermal insulation mortar is regarded as a ternary system composed of pores, vitrified beads and cement matrix. The experimental results show that the porosity content of the model is less than 10%. The error of thermal conductivity calculated by the new model can be controlled within 5%.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU578.1;TU551

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