石蜡熔化蓄热的实验研究

石蜡是一种常见的相变材料,文章对石蜡的熔化蓄热进行了单管实验研究,并进行了差示扫描量热(DSC)测试,以所得的石蜡的相变温度为基础,研究石蜡在不同温度下的熔化情况,利用Agilent 34970A系统采集实验数据并处理,对其温度场的分布进行了分析比较。实验结果表明,石蜡的熔化是遵循一定规律的,开始阶段通过热传导熔化,等到出现一定液相时出现自然对流,并且加热温度越高,溶解越快,自然对流出现越早。石蜡导热系数比较低,因此应用范围受到了限制,文章为进一步改进石蜡的导热性能、使其得到更为广泛的应用提供了实验基础。

Experimental Research on Melting Heat Storage of Paraffin

Paraffin is a common kind of phase change materials(PCMs).The experiment on melting heat storage of paraffin was conducted in a tube.The phase change temperature was measured by DSC,and the melting of the paraffin was studied at different temperatures.The data was input to the computer by Agilent 34970A.The melting curve and temperature field were analyzed.The results showed that at the initial stage conduction occupied the main status in the heat transfer,but as time passed,natural convection appeared and made important effect,and the temperature was higher,the convection appeared earlier.The application of the paraffin was limited because of the low conductivity.This paper could help to improve the thermal properties and extend the application of paraffin.