由于太阳能间歇性和不稳定性的缺点,给其在供热方面的应用带来了局限,采用相变储能法可改善太阳能供热应用的缺点。对此以石蜡为基液,向其中添加石墨烯通过“两步法”制备出石墨烯质量分数分别为0.1%、0.3%和0.5%的复合相变材料,搭建复合相变材料蓄放热实验台并记录数据。结果表明:在相同的实验条件下,石墨烯/石蜡复合相变材料随着石墨烯质量分数的增加,熔化速率也随之增加,在添加量为0.5%时增加了14.15%;凝固速率也随石墨烯质量分数的增加而增加,但效果不如熔化速率明显;复合相变材料在圆管外的蓄放热过程中,位于圆管底部的材料熔化与凝固效果均不理想。
Due to the shortcomings of solar energy intermittent and unstable,it has brought limitations to its application in heating.The phase change energy storage method can improve the shortcomings of solar heating applications.A composite phase change material with a mass fraction of 0.1%,0.3% and 0.5% were prepared by adding graphene(GR) to the paraffin-based solution through a two-step method.The experimental stage was used to carry out the composite phase change material storage.A composite phase change material storage and release test bench was established and recorded data.The results shown that the GR/paraffin composite phase change material increased with the increase of GR mass fraction,and increased by 14.15% when the added amount was 0.5%.The solidification rate also varied with the GR mass fraction.The solidification rate also increased with the increase of GR mass fraction,but the effect was not as obvious as the melting rate.the melting and solidification of the materials at the bottom of the tube were not ideal in the process of heat storage and release.
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基金资助
河北省暖通空调工程技术研究中心绩效评估后补助资助项目(169676324H)
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