本文關(guān)鍵詞：石墨烯氣凝膠導熱定形相變材料的制備及性能研究　出處：《西南科技大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 石墨烯氣凝膠 定形相變材料 制備 導熱

【摘要】：相變儲能技術(shù)是一項利用相變材料在相變過程中吸收或釋放潛熱來儲存或釋放熱能的能量儲存技術(shù)。一些有機相變材料(如:石蠟、硬脂酸等)具有高的相變潛熱、良好的熱穩(wěn)定性、寬的相變溫度范圍、無毒無害、無過冷和相分離現(xiàn)象等特點,使其在建筑節(jié)能、太陽能儲能、電子設(shè)備、紡織等領(lǐng)域有著廣闊的應用前景。然而,在實際應用過程中發(fā)現(xiàn)相變材料存在熱導率低以及易滲漏等問題,嚴重限制了相變材料的應用。為了解決這些問題,于是對相變材料進行封裝定形以及增強其導熱性是一種有效的解決方案。本文采用原位自組裝法,通過配制不同濃度的氧化石墨烯(GO)分散液和控制不同反應溫度制備了不同形貌的石墨烯氣凝膠(GA),接著用真空浸漬法制備了石蠟/GA、EVA/石蠟/GA和硬脂酸/GA定形相變材料。以GA作為導熱骨架,研究了GA以及不同形貌GA對石蠟/GA、EVA/石蠟/GA和硬脂酸/GA定形相變材料的熱性能、滲漏率、熱導率、光熱儲能的影響,研究表明GA能夠提高定形相變材料的熱導率,在一定程度上能夠包覆相變材料,而且還能影響其相變焓值(除了硬脂酸/GA);對于不同形貌的GA而言,其孔徑越小,孔隙越規(guī)整,其定形相變材料的熱導率越高、對相變材料的包覆性越高、滲漏率越低、能量儲存效率(?)越高。以GA和少量的EVA作為雙重支撐材料,使定形相變材料的滲漏現(xiàn)象得到明顯的好轉(zhuǎn),但由于EVA的加入,定形相變材料的相變焓值隨EVA含量的增強而減少,且低于石蠟/GA定形相變材料。以硬脂酸作為相變材料時,由于硬脂酸自身的特性,使得硬脂酸/GA定形相變材料的相變焓值、熱導率、光熱儲能性能都低于石蠟體系,而且發(fā)現(xiàn)硬脂酸與GA相結(jié)合時,不能影響其相變焓值。
[Abstract]:Phase change energy storage (PCE) is a kind of energy storage technology which can store or release heat by absorbing or releasing latent heat during phase change. Some organic phase change materials (such as paraffin wax) are used to store or release heat. Stearic acid) has the characteristics of high latent heat of phase change, good thermal stability, wide range of phase change temperature, non-toxic and harmless, no supercooling and phase separation, etc., which makes it energy saving in building, solar energy storage, electronic equipment and so on. Textile and other fields have broad application prospects. However, in the practical application process, it is found that phase change materials have the problems of low thermal conductivity and easy leakage, which seriously limit the application of phase change materials. In order to solve these problems. So it is an effective solution to encapsulate phase change material and enhance its thermal conductivity. In this paper, in situ self-assembly method is used. Graphene aerogels with different morphologies were prepared by preparing different concentrations of graphene oxide (GOO) dispersions and controlling different reaction temperatures. Then paraffin / GA was prepared by vacuum impregnation. EVA / paraffin / GA and stearic acid / GA were used as phase transition materials. The effects of GA and different morphologies of GA on paraffin / GA were studied using GA as the heat conduction skeleton. The effects of EVA / paraffin / GA and stearic acid / GA on the thermal properties, leakage, thermal conductivity and photothermal energy storage of PCMs were investigated. The results show that GA can improve the thermal conductivity of PCMs. To some extent, the phase change material can be coated and the enthalpy of phase transition can be affected (except stearic acid / GAN; For GA with different morphologies, the smaller the pore size and the more regular the pore size, the higher the thermal conductivity, the higher the encapsulation, the lower the leakage rate and the energy storage efficiency. Using GA and a small amount of EVA as double support materials, the leakage of the amorphous phase change material was improved obviously, but due to the addition of EVA. The enthalpy of phase transition decreases with the increase of EVA content, and is lower than that of paraffin / GA phase change material. When stearic acid is used as phase change material, the stearic acid has its own characteristics. The results show that the enthalpy of phase transition, thermal conductivity and photothermal energy storage of stearic acid / GA are lower than those of paraffin system, and it is found that stearic acid combined with GA can not affect the enthalpy of phase transition.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB34

【參考文獻】

相關(guān)期刊論文 前2條

1 趙凱;俞從正;馬興元;高大鵬;;相變微膠囊保溫材料的研究、制備和應用[J];皮革與化工;2010年02期

2 劇霏;劉超;程軍;汪南;朱冬生;;蓄熱材料在熱泵及其它方面的應用[J];制冷;2006年01期

相關(guān)博士學位論文 前1條

1 吳淑英;納米復合蓄熱材料強化相變傳熱實驗與數(shù)值模擬研究[D];華南理工大學;2010年

相關(guān)碩士學位論文 前1條

1 李艷;相變儲能材料熱性能研究[D];山東輕工業(yè)學院;2012年

，

本文編號：1436820