本文選題：儲(chǔ)能 + 復(fù)合相變材料�。� 參考：《蘇州科技大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)快速發(fā)展,能源的消耗量越來越大,帶來的環(huán)境問題也越來越大。據(jù)統(tǒng)計(jì),我國建筑能耗占社會(huì)總能耗的40%以上,采暖和空調(diào)占比達(dá)50%左右,建筑節(jié)能已成為社會(huì)關(guān)注的焦點(diǎn)。相變儲(chǔ)能以潛熱方式儲(chǔ)存能量,具有儲(chǔ)能密度大、儲(chǔ)能溫度變化小等優(yōu)點(diǎn),被廣泛應(yīng)用于能量存儲(chǔ)、余熱回收、太陽能利用、建筑節(jié)能等領(lǐng)域。相變材料與建筑圍護(hù)結(jié)構(gòu)相結(jié)合,有助于改善室內(nèi)熱環(huán)境,降低室內(nèi)溫度峰值,減少空調(diào)能耗。儲(chǔ)能技術(shù)是一種提高能源利用率,清潔無污染的節(jié)能技術(shù),有利于解決能源供應(yīng)與需求在時(shí)間和空間上不匹配的矛盾,在建筑節(jié)能中具有廣闊的應(yīng)用前景。將十四酸(MA)、十六醇(HD)和十二酸(LA)、聚乙二醇1000(PEG)進(jìn)行二元共混復(fù)合,通過步冷曲線法得到低共晶質(zhì)量配比分別為48:52和28:72,其低共晶溫度分別為35.3℃、32.1℃。通過酸、醇復(fù)合,克服了脂肪醇多次相變的缺點(diǎn)。利用T-history獲得有機(jī)復(fù)合相變材料相變潛熱分別為230.3kJ/kg和125.2kJ/kg,其固態(tài)有效導(dǎo)熱系數(shù)分別為0.25W/(m·K)和0.19W/(m·K)。對(duì)兩組有機(jī)復(fù)合相變材料進(jìn)行熱穩(wěn)定性實(shí)驗(yàn),300次熱循環(huán)實(shí)驗(yàn)表明,48%MA+52%HD復(fù)合相變材料降溫曲線變化不大,其結(jié)晶溫度變化在0.2℃以內(nèi),28%LA+72%PEG復(fù)合相變材料經(jīng)100次熱循環(huán)后,結(jié)晶溫度下降了2.0℃,熱穩(wěn)定性較差。采用“熔融插層法”,制備膨潤土基有機(jī)復(fù)合相變材料,解決二元有機(jī)復(fù)合相變材料液相滲漏的問題。利用十六烷基三甲基溴化銨對(duì)鈣基膨潤土進(jìn)行改性,增大了膨潤土的納米層間距離,降低了層間極性,提高親油性,有利于有機(jī)大分子進(jìn)入層間。利用擴(kuò)散-滲出圈法確定了有機(jī)復(fù)合相變材料和改性膨潤土的最佳質(zhì)量復(fù)配比為5:5,并通過SEM、FT-IR、DSC等技術(shù)手段表征了復(fù)合情況,經(jīng)200次熱循環(huán)實(shí)驗(yàn)表明,實(shí)驗(yàn)樣品的最大質(zhì)量損失率為0.12%,表面沒發(fā)生泄露、滲出、揮發(fā)等現(xiàn)象,復(fù)合穩(wěn)定性良好。制備了相變材料含量為0%、3%、6%、9%的儲(chǔ)能墻板,模擬夏季室外溫度變化,測試了4種墻板的溫度響應(yīng)。隨著相變材料含量的增加,儲(chǔ)能墻板的溫度調(diào)節(jié)能力越明顯。相變材料含量為6%的儲(chǔ)能墻板在高溫段的平均溫度比普通墻板降低了3.0℃,有效降低了墻板表面溫度響應(yīng)峰值,降低了峰值負(fù)荷,實(shí)現(xiàn)能量轉(zhuǎn)移。利用Matlab模擬墻板內(nèi)部傳熱過程,展示了墻板內(nèi)部各節(jié)點(diǎn)不同時(shí)刻的溫度分布。
[Abstract]:With the rapid development of economy, the consumption of energy is increasing and the environmental problems are becoming more and more serious. According to statistics, building energy consumption in China accounts for more than 40% of the total energy consumption, heating and air conditioning accounts for about 50% of Prida, building energy saving has become the focus of social attention. Phase change energy storage is widely used in energy storage, waste heat recovery, solar energy utilization, building energy saving and so on. The combination of phase change material and building envelope will help to improve the indoor thermal environment, reduce the peak indoor temperature and reduce the energy consumption of air conditioning. Energy storage technology is a kind of energy saving technology which can improve energy efficiency, clean and no pollution. It is helpful to solve the contradiction between energy supply and demand in time and space, and has a broad application prospect in building energy conservation. Tetradecanoic acid (MA), hexadecanol (HD), dodecanoic acid (LA) and polyethylene glycol 1000 (PEG) were mixed in binary blends. The low eutectic mass ratios were 48:52 and 28: 72, respectively, and the low eutectic temperatures were 35.3 鈩，

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