本文關(guān)鍵詞：季戊四醇與三羥甲基乙烷相變材料蓄熱性能研究　出處：《太陽能學(xué)報(bào)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 固-固相變 復(fù)合材料 相變溫度 過冷度 導(dǎo)熱性能

【摘要】：對一類可用于太陽能中溫蓄熱的有機(jī)相變材料性能進(jìn)行實(shí)驗(yàn)分析。相變蓄熱材料具有儲熱密度大、溫度波動(dòng)小等優(yōu)點(diǎn),但也存在導(dǎo)熱系數(shù)低、過冷度較大的問題,對相變材料進(jìn)行復(fù)合,能有效改善其相變特性與導(dǎo)熱性能。利用高溫融化-混合的方法制備季戊四醇(PE)與三羥甲基乙烷(PG)的混合材料,使用DSC儀器分析相變溫度與相變潛熱,同時(shí)研究不同形核劑對混合材料的相變溫度、過冷度的影響。利用壓制成型—融化吸附—冷卻的方法制備膨脹石墨與PE、PG的復(fù)合相變材料,用激光導(dǎo)熱系數(shù)測試儀測試復(fù)合相變材料的導(dǎo)熱性能。結(jié)果表明,PE與PG混合相變材料的相變溫度區(qū)間基本在25℃以上,過冷度約15℃,膨脹石墨作為形核劑,使過冷度有一定減小。增加復(fù)合相變材料中膨脹石墨的含量能提高材料各個(gè)方向的導(dǎo)熱系數(shù)。
[Abstract]:The properties of a class of organic phase change materials which can be used for solar energy medium temperature storage are analyzed experimentally. The phase change materials have the advantages of high heat storage density and low temperature fluctuation, but there are also low thermal conductivity. When the supercooling degree is high, the phase change material is recombined. The mixture of pentaerythritol (PE) and trimethylolethane (PGN) was prepared by melting and mixing at high temperature. The phase transition temperature and latent heat of phase transition were analyzed by DSC instrument, and the phase transition temperature of different nucleating agents on the mixed material was also studied. The influence of undercooling degree. The composite phase change material of expanded graphite and PEPGs was prepared by pressing molding melting adsorption-cooling method. The thermal conductivity of composite phase change material was tested by laser thermal conductivity tester. The results show that the phase change temperature range of PE-PG mixed phase change material is above 25 鈩，

本文編號：1439172