A novel method for determining the melting point, fusion latent heat, specific heat capacity and thermal conductivity of phase change materials

作者：Yang, Xiao-Hu; Liu, Jing^*

来源：International Journal of Heat and Mass Transfer, 2018, 127: 457-468.

DOI：10.1016/j.ijheatmasstransfer.2018.07.117

• Phase change materials
• Property measurement
• Fusion latent heat
• Thermal conductivity
• Specific heat capacity

In this paper, a novel method for determining the main thermophysical properties of phase change materials (PCM) is proposed, which can be called as "T-melting CHF" method. The melting point, fusion latent heat, thermal conductivity, and specific heat capacity in both solid and liquid phase of PCM, can all be obtained simultaneously by only one test. The theoretical fundamentals lying behind are introduced, the measurement apparatus and measurement principles are presented, and corresponding restrictive conditions for high accuracy measurement are provided. Theoretically, the thermophysical properties can be accurately measured by the proposed method if the test module can be perfectly insulated. However, heat loss inevitably exists in practical measurement, it will significantly influence the measuring accuracy, hence a correction method is proposed to improve this situation. A typical low melting point metal (gallium) and a typical organic PCM (n-eicosane) were tested to verify the feasibility and accuracy of the method. The experimental results agree well with the reference data reported in the literature. Compared with conventional measurement techniques, the method proposed here has advantages such as simple structure, low cost and high measurement speed; more importantly, it is able to measure multiple properties simultaneously.

• 出版日期2018-12
• 单位清华大学; 中国科学院大学; 中国科学院理化技术研究所