本文選題：儲能 + 復合相變材料��； 參考：《蘇州科技大學》2017年碩士論文

【摘要】：隨著經(jīng)濟快速發(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,我國建筑能耗占社會總能耗的40%以上,采暖和空調占比達50%左右,建筑節(jié)能已成為社會關注的焦點。相變儲能以潛熱方式儲存能量,具有儲能密度大、儲能溫度變化小等優(yōu)點,被廣泛應用于能量存儲、余熱回收、太陽能利用、建筑節(jié)能等領域。相變材料與建筑圍護結構相結合,有助于改善室內熱環(huán)境,降低室內溫度峰值,減少空調能耗。儲能技術是一種提高能源利用率,清潔無污染的節(jié)能技術,有利于解決能源供應與需求在時間和空間上不匹配的矛盾,在建筑節(jié)能中具有廣闊的應用前景。將十四酸(MA)、十六醇(HD)和十二酸(LA)、聚乙二醇1000(PEG)進行二元共混復合,通過步冷曲線法得到低共晶質量配比分別為48:52和28:72,其低共晶溫度分別為35.3℃、32.1℃。通過酸、醇復合,克服了脂肪醇多次相變的缺點。利用T-history獲得有機復合相變材料相變潛熱分別為230.3kJ/kg和125.2kJ/kg,其固態(tài)有效導熱系數(shù)分別為0.25W/(m·K)和0.19W/(m·K)。對兩組有機復合相變材料進行熱穩(wěn)定性實驗,300次熱循環(huán)實驗表明,48%MA+52%HD復合相變材料降溫曲線變化不大,其結晶溫度變化在0.2℃以內,28%LA+72%PEG復合相變材料經(jīng)100次熱循環(huán)后,結晶溫度下降了2.0℃,熱穩(wěn)定性較差。采用“熔融插層法”,制備膨潤土基有機復合相變材料,解決二元有機復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鈣基膨潤土進行改性,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,有利于有機大分子進入層間。利用擴散-滲出圈法確定了有機復合相變材料和改性膨潤土的最佳質量復配比為5:5,并通過SEM、FT-IR、DSC等技術手段表征了復合情況,經(jīng)200次熱循環(huán)實驗表明,實驗樣品的最大質量損失率為0.12%,表面沒發(fā)生泄露、滲出、揮發(fā)等現(xiàn)象,復合穩(wěn)定性良好。制備了相變材料含量為0%、3%、6%、9%的儲能墻板,模擬夏季室外溫度變化,測試了4種墻板的溫度響應。隨著相變材料含量的增加,儲能墻板的溫度調節(jié)能力越明顯。相變材料含量為6%的儲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峰值,降低了峰值負荷,實現(xiàn)能量轉移。利用Matlab模擬墻板內部傳熱過程,展示了墻板內部各節(jié)點不同時刻的溫度分布。
[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，

本文編號：2086944