新型复合相变储能材料Na/Paraffin的制备与性能分析

为提升广泛应用于相变储能领域的石蜡的导热系数,在手套箱内将导热系数高、熔点低、密度小的金属Na与石蜡复合为Na/paraffin新型相变储能材料,并对其导热系数、相变潜热及储/放热特性进行研究。结果表明:5%Na/95%paraffin复合相变储能材料导热系数较纯石蜡提高了17.6倍,储/放热速率均较纯石蜡提升了1倍;经过200次循环实验后,3%Na/97%paraffin复合相变储能材料相变温度由60.58℃下降到59.65℃,相变潜热由166.7520J·g~(-1)下降到160.5632J·g~(-1),热导率由2.33W·m~(-1)·K~(-1)减少到1.98W·m~(-1)·K~(-1)。

Preparation and Performance Analysis of Na/Paraffin New-style Composite Phase Change Energy Storage Material

In order to improve the thermal conductivity of paraffin widely applied in phase change energy storage field,metal Na with high thermal conductivity,low melting point and low density was compounded to paraffin to form a new phase change energy storage material (Na/paraffin) in glove box,and the thermal conductivity,latent heat and heat storage/release characteristics of Na/paraffin were studied.The results show that thermal conductivity of 5％Na/95％paraffin composite phase change energy storage materials is improved 17.6 times compared to pure paraffin and the heat storage/release ratio of 5 ％ Na/95％ paraffin is two times of pure paraffin.After 200 cycles experiment,the phase transition temperature of 3％Na/97％paraffin composite phase change energy storage materials falls from 60.58℃ to 59.65℃.The phase transformation latent heat and thermal conductivity rate are reduced from 166.7520J · g-1 to 160.5632J · g-1 and from 2.33W · m-1 · K-1 to 1.98W · m-1 · K-1,respectively.