T-history法及其在相变材料热物理性能测定中的应用

doi:10.19799/j.cnki.2095-4239.2020.0294

摘要/Abstract

摘要：

以相变材料(phase change materials，PCMs)为基础的相变潜热储热技术(latent heat thermal energy storage，LHTES)因可在较小的温度波动范围内可逆的吸收和释放大量的相变潜热，在解决低品位热能在时间和空间上的不匹配方面具有潜在的应用前景。相变材料的热物理性能不仅决定了潜热储热系统的储热密度和储/放热效率，而且影响着储能系统的运行成本和寿命，快速、准确、方便地获取满足工程应用需求的相变材料热物理学参数至关重要。本文通过对相关文献的探讨，回顾了T-history法的原理、实验装置和数学模型。鉴于T-history法模型过于简化、相变过程中固-液相界面难以定义的缺陷，着重介绍了提高T-history法测试准确度的方法。综述了T-history曲线(T-t曲线)在相变材料相变点、过冷度和相变温度区间确定中的应用，重点介绍了T-history曲线在相变材料比热容、相变潜热测定中的应用，以及比热容-温度曲线、相变焓-温度曲线数学模型的建立和应用。综合分析表明，利用T-history法可以方便的获得相变材料的过冷度、相变区间、比热容和相变焓等热物理学参数。

关键词: 相变材料, T-history曲线, 过冷度, 相变区间, 比热容, 相变焓

Abstract:

A phase change latent heat storage system (LHTES) based on phase change materials (PCMs) can reversibly absorb and release a large amount of latent heat over a small temperature range. These systems have a potential application in solving the mismatch of low-grade thermal energy in time and space. The thermophysical properties of PCMs can determine the heat storage density, heat storage/release efficiency, operating cost, and lifetime of the heat storage system. It is therefore important to quickly, accurately, and easily measure the thermophysical parameters of PCMs that may meet the needs of engineering applications. This article reviews the principles, experimental devices, and mathematical models of the T-history method. In light of the over-simplification of the T-history method and the difficulty in defining the solid-liquid interface in the phase transition process, a way to improve the test accuracy of the T-history method is emphasized. The application of the T-history curve (T-t curve) in the determination of a phase change point, subcooling, and the phase change temperature range of PCMs is reviewed, and the application of the T-t curve to determine the specific heat capacity and phase change latent heat of PCMs is introduced. Mathematical models and applications for the specific heat capacity-temperature curve and phase change enthalpy-temperature curve are presented. A comprehensive analysis shows that the T-history method can be used to easily obtain thermophysical parameters including the subcooling degree, phase transition interval, specific heat capacity, and phase transition enthalpy of PCMs.

Key words: phase change materials, T-history curve, supercooling, phase change temperature range, heat capacity, phase change enthalpy

中图分类号:

TB 34

王建君, 沈玉霞, 张宇, 张托弟, 李勇, 王毅. T-history法及其在相变材料热物理性能测定中的应用[J]. 储能科学与技术, 2021, 10(1): 280-286.

Jianjun WANG, Yuxia SHEN, Yu ZHANG, Tuodi ZHANG, Yong LI, Yi WANG. T-history method and its application in the determination of thermophysical properties of phase change materials[J]. Energy Storage Science and Technology, 2021, 10(1): 280-286.

图/表 3

参考文献 24

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