t -历史法在亚零相变材料热性能研究中的应用

Thandiwe Bongani Radebe, Asasei Unarine Casey Ndanduleni, Zhongjie Huan
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摘要

T-history方法,最早由Zhang等人提出。是一种用于测定相变材料(PCM)的潜热、比热、导热系数、熔点和过冷程度的简单方法。该方法是基于测量材料随时间的温度。假设PCM样品和参考物质以类似的方式与环境交换热能,因为它是基于集总电容法,并且样品内部的温度分布是均匀的。与传统方法相比,T历史方法有许多优点;然而,T历史方法也有一些缺点,多年来不同的作者对其进行了改进。本研究通过实验考察了该技术在相变温度低于0℃的PCM中的可靠性。该技术首先用于确定相变温度为0℃的去噪水的性质,以混合比为50/50的乙二醇为基准物质。其次,在-10℃的相变温度下,测定盐对水浓度为19.5%的氯化钾的性质,采用了两种分析方法,一种是在充电过程中将样品浸入防冻液中,另一种是在放电阶段将样品暴露在环境空气中。利用已知文献对实验结果进行进一步验证,确定了KCl潜热。本研究发现,使用该技术测量的KCl潜热与DSC确定的已知结果有6.2%的差异。本研究建议在设计潜热储热系统(LHTESS)时使用T历史方法,因为在设计过程中,样本量是精确热物理性质的重要特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of T-history Method Application for Sub-zero Phase Change Material Thermal Properties
The T-history method, first proposed by Zhang & Jiang, is a simple method used to determine the latent heat, specific heat, thermal conductivity, melting point, and degree of supercooling of a phase-change material (PCM). The method is based on the measurement of the temperature of the material over time. It assumes that the PCM sample and the reference material exchange thermal energy with the environment in a similar manner, because it is based on the lumped capacitance method, and the temperature distribution inside the sample is uniform. There are multiple advantages that the T history method has over conventional methods; however, the T history method also has some downfalls, which have been improved over the years by different authors. This study experimentally investigates the reliability of this technique for PCM with a phase change temperature below 0 ° C. The technique is used to first determine the properties of denoised water with a phase change temperature of 0 ° C, using ethylene glycol with a mixture ratio of 50/50 as reference material. Second, by determining the properties of KCl with a concentration of 19.5% salt to water for a phase change temperature of -10 ° C. Two analytical approaches were used, one by immersing the samples in antifreeze during the charging process and the other by exposing the samples to ambient air during the discharging phase. The experimental results were further validated using the known literature to determine the latent heat of KCl. This study found that the latent heat of KCl measured using the technique has a 6.2% difference from the known results determined by the DSC. This study recommends the use of the T history method when designing latent heat thermal energy storage systems (LHTESS), because the sample size is an important characteristic for accurate thermophysical properties during the design process.
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