中文摘要：

针对纯石蜡（正十八烷）作为固－液相变储能材料存在导热系数小、传热性能差的缺点，采用两步法制备了铜纳米粒子质量分数分别为0％、0．1％、0．2％、0．5％、1％、2％的铜纳米粒子/正十八烷复合相变材料，并对其热物性进行了实验研究。采用瞬态热针法测量复合相变材料的导热系数。实验结果表明，铜纳米粒子可有效提高正十八烷的导热系数。利用DSC对铜纳米粒子/正十八烷复合相变材料进行热分析，结果表明，体系中添加铜纳米粒子后正十八烷的相变温度变化很小，而体系的相变潜热随铜纳米粒子质量分数的增加而逐渐减小，但减小幅度不大，因此铜纳米粒子的加入对正十八烷的蓄热能力影响较小。另外，对铜纳米粒子质量分数为1％的铜纳米粒子/正十八烷复合相变材料的热稳定性进行研究，结果表明其具有良好的热稳定性。

英文摘要：

Based on paraffin wax （octadecane） as the disadvantages of low thermal conductivity and bad a kind of solid-liquid phase change materials （PCMs） having heat transfer performance, octadecane/copper nano-particles composite PCMs were prepared by two steps and their thermal properties were measured. The mass fraction of copper nano particles in PCMs is 0. 1%, 0. 2%, 0. 5%, 1% and 2%, respectively. Transient hot probe method was used to measure the thermal conductivity of PCMs. The results show that copper nano-particles can effectively improve the thermal conductivity of octadecane. Thermoanalysis measurement was finished by differential scanning calorimetry （DSC） analysis techniques. The results show that the phase-transition temperature of octadecane which is added with copper nano particles changes little, while the latent heat of the composite PCMs gradually decrease with the increasing mass fraction of copper nano particles, but decrease slightly. Therefore copper nano-particles have less influence on the heat storage capacity of octadecane. Finally, the heat stability of octadecane/copper nano particles composite PCMs which contain 1% copper nano-particles was studied by DSC analysis techniques. The results show that latent heat and phase-transition temperature of composite PCMs do not obviously decrease with the increasing number of thermal cycles, demonstrating that composite PCMs have good thermal stability.