【摘要】：隨著科技的發(fā)展,各種高性能纖維及復(fù)合技術(shù)相繼出現(xiàn),紡織復(fù)合保溫材料的應(yīng)用領(lǐng)域已經(jīng)從服用拓展到了各類工程領(lǐng)域。戶外使用的紡織復(fù)合保溫材料,內(nèi)部的傳熱通常處于非穩(wěn)態(tài)傳熱過(guò)程,目前紡織復(fù)合保溫材料導(dǎo)熱性能的測(cè)試大都采用穩(wěn)態(tài)測(cè)試法,并不能真實(shí)反映材料在戶外使用時(shí)的內(nèi)部導(dǎo)熱情況。本課題以農(nóng)用紡織復(fù)合保溫材料作為研究對(duì)象,通過(guò)搭建的非穩(wěn)態(tài)測(cè)試平臺(tái)、采用MATLAB數(shù)值解析程序,測(cè)試分析研究了環(huán)境因素及結(jié)構(gòu)因素對(duì)材料的導(dǎo)熱性能的影響�；诜欠�(wěn)態(tài)無(wú)限大平板導(dǎo)熱模型推導(dǎo)出計(jì)算熱導(dǎo)率的溫度時(shí)間函數(shù),通過(guò)MATLAB編程擬合計(jì)算得到材料熱導(dǎo)率,此程序可以簡(jiǎn)單快捷處理內(nèi)部溫度隨時(shí)間變化的數(shù)據(jù)。搭建了非穩(wěn)態(tài)測(cè)試裝置,并進(jìn)行了準(zhǔn)確度測(cè)試分析,通過(guò)與穩(wěn)態(tài)測(cè)試分析比較發(fā)現(xiàn),采用非穩(wěn)態(tài)測(cè)試方法得到的熱導(dǎo)率離散度低,可重復(fù)性強(qiáng)。系統(tǒng)的研究了環(huán)境因素對(duì)導(dǎo)熱性能的影響。環(huán)境濕度增大會(huì)引起材料的含濕量增大從而加快熱傳導(dǎo)性能:環(huán)境溫度升高,材料的導(dǎo)熱性能總體呈現(xiàn)增加的趨勢(shì),但變化趨勢(shì)并不是很大;初始溫度在小范圍內(nèi)波動(dòng)時(shí),熱導(dǎo)率的變化不大,當(dāng)初始溫度變化較大時(shí),熱導(dǎo)率有明顯增大的趨勢(shì)。測(cè)試分析研究了材料結(jié)構(gòu)參數(shù)對(duì)導(dǎo)熱性能的影響。采用滌綸復(fù)合聚乙烯涂層膜作為表層覆蓋材料時(shí),材料的保溫隔熱性能最好;熱導(dǎo)率隨著孔隙率的增大而減小,當(dāng)孔隙率含量在85%時(shí),熱導(dǎo)率達(dá)到最小值;隨著回潮率的增加,材料的導(dǎo)熱系數(shù)增加;對(duì)變密度結(jié)構(gòu)的紡織復(fù)合保溫材料,選用外層密度較大而內(nèi)部密度較小的結(jié)構(gòu)時(shí),其熱導(dǎo)率最小。
[Abstract]:With the development of science and technology, various kinds of high performance fiber and composite technology have appeared one after another. The application field of textile composite insulation material has been expanded from wearing to various engineering fields. The heat transfer inside the textile composite insulation materials used outdoors is usually in the process of unsteady heat transfer. At present, the thermal conductivity of textile composite thermal insulation materials is mostly tested by the steady-state test method. It does not really reflect the internal heat conduction of the material in outdoor use. In this paper, the influence of environmental factors and structural factors on the thermal conductivity of agricultural textile composite thermal insulation materials is studied by using the MATLAB numerical analysis program and the unsteady test platform. Based on the unsteady infinite plate heat conduction model, the temperature time function for calculating thermal conductivity is derived, and the material thermal conductivity is calculated by MATLAB programming. This program can deal with the data of internal temperature with time quickly and simply. The unsteady-state testing device is built and the accuracy analysis is carried out. The results show that the thermal conductivity dispersion is low and the repeatability is strong by using the unsteady-state test method compared with the steady-state test analysis. The influence of environmental factors on thermal conductivity was studied systematically. The increase of environmental humidity will lead to the increase of moisture content of the material, thus speeding up the thermal conductivity: the thermal conductivity of the material increases with the increase of ambient temperature, but the change trend is not very large; When the initial temperature fluctuates in a small range, the thermal conductivity does not change much, but when the initial temperature changes greatly, the thermal conductivity increases obviously. The influence of material structure parameters on thermal conductivity was studied. When polyester composite polyethylene coating film is used as the coating material, the thermal conductivity is the best, and the thermal conductivity decreases with the increase of porosity, and the thermal conductivity reaches the minimum when the porosity content is 85. With the increase of moisture regain, the thermal conductivity of the material increases, and the thermal conductivity of the textile composite thermal insulation material with variable density structure is the lowest when the structure with higher outer density and lower internal density is selected.
【學(xué)位授予單位】：西安工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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本文編號(hào)：2296621