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首页> 外文期刊>Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion >Preparation of phase change material emulsions with good stability and little supercooling by using a mixed polymeric emulsifier for thermal energy storage
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Preparation of phase change material emulsions with good stability and little supercooling by using a mixed polymeric emulsifier for thermal energy storage

机译：通过使用混合聚合物乳化剂进行热量储存，制备相变材料乳液，稳定性良好，过冷少

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AbstractA mixed polymeric emulsifier consisting of polyvinyl alcohol (PVA) and polyethylene glycol-600 (PEG-600) was explored for preparing high-performance phase change material emulsions (PCMEs) containing the paraffin with a melting point of 62–64°C. After the effects of the mass ratio of PVA to PEG-600, the mass ratio of the mixed emulsifier to the paraffin and the homogenization rate on the size distribution, viscosity and dispersion stability of the PCMEs containing 20wt% paraffin were systematically investigated, the optimal emulsifying process parameters have been determined to be the mass ratio of PVA to PEG-600 of 50:50, the mass ratio of the mixed emulsifier to paraffin of 1:5 and the homogenization rate of 10,000rpm. Accordingly, the PCMEs with the paraffin mass fractions varying from 10wt% to 30wt% were prepared. It is found that the paraffin has been well dispersed in water in the form of sphere-like droplets with average diameters ranging from 3μm to 11μm in the obtained PCMEs. Significantly, the PCMEs with different mass fractions of the paraffin exhibit no supercooling, owing to the function of the mixed polymeric emulsifier as a nucleating agent. The apparent specific heat of PCMEs are 1.51–2.18 times as high as that of water at the phase transition temperature region, due to the existent of the paraffin in them. Their apparent thermal conductivity gradually decreases with an increase in the mass fraction of the paraffin, while the viscosity increases significantly with mass fraction of the paraffin at the same temperatures. Furthermore, the pumping power consumption of the PCMEs shows a drastic reduction as compared to that of water at the same heat storage capaci
机译：<！[cdata [ 抽象 探讨了由聚乙烯醇（PVA）和聚乙二醇-600（PEG-600）组成的混合聚合物乳化剂，用于制备高性能相变含有熔点为62-64℃的石蜡的材料乳液（PCME）。在PVA对PEG-600的质量比的影响之后，系统研究了混合乳化剂与石蜡的质量比和均匀化率对含有20wt％石蜡的PCME的尺寸分布，粘度和分散稳定性的均质率被系统地研究，最佳乳化过程参数已被确定为PVA至PEG-600的质量比50:50，混合乳化剂与石蜡的质量比为1：5和10,000rpm的均质化率。因此，制备具有从10wt％至30wt％的石蜡质量级分的PCMES被制备。结果发现石蜡在球形液滴的形式下良好地分散在水中，其平均直径在得到的PCMES中为3μm至11μm。显着地，由于混合聚合物乳化剂作为成核剂，具有不同质量级分的PCME没有石蜡的质量分数表现出过冷。由于它们中的石蜡存在，PCMES的表观特异性热量与相变温度区域的水处相高1.51-2.18倍。它们的表观导热率随着石蜡的质量分数的增加而逐渐降低，而粘度在相同温度下的石蜡质量分数显着增加。此外，与相同蓄热电容器的水相比，PCME的泵送功耗显示出剧烈降低

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