作者：马超¹, 冀志江¹, 王静¹, 王永超¹, 解帅¹, 吴渝¹, 赵聪慧²

作者单位：1. 中国建筑材料科学研究总院有限公司 绿色建筑材料国家重点实验室，北京 100024;
2. 阜平县职业技术教育中心，河北 保定 073200

关键词：T-history外推法;热物性;赤藓糖醇;潜热;热导率

摘要：

相变材料的热物性对其筛选与应用至关重要。通常情况下，原始的T-history法可以求解相变温度低于90 ℃的相变材料的热物性，且简单方便、测试样品体积大，接近于实际相变过程。为了求解相变温度高于90 ℃的相变材料的热物性，对原始T-history法进行了改进，并将其命名为T-history外推法（THEM）。它以纯水为参考材料，将纯水的降温曲线拟合外推至相变材料的初始冷却温度，从而求解温度高于90 ℃的相变材料的热物性。选取熔点为118 ℃的赤藓糖醇，基于T-history外推法进行实验验证，结果表明，固体赤藓糖醇的导热系数与参考值吻合良好，潜热的计算值与DSC测试值的误差控制在5%以内。改进后的T-history外推法可以用于求解温度高于90 ℃相变材料的热物性。

Research on calculation of the thermophysical properties of phase change materials with temperature above 90 ℃ using T-history extrapolation method
MA Chao¹, JI Zhijiang¹, WANG Jing¹, WANG Yongchao¹, XIE Shuai¹, WU Yu¹, ZHAO Conghui²
1. State Key Laboratory of Green Building Materials, China Building Materials Academy Co., Ltd., Beijing 100024, China;
2. Fuping Vocational and Technical Education Center, Baoding 073200, China
Abstract: The thermophysical properties of phase change materials (PCMs) are crucial for their screening and application. In general, the original T-history method is a simple method to determine the properties of the PCMs with phase change temperature below 90 ℃. In this paper, the original T-history method has been improved and named as T-history extrapolation method (THEM) in order to measure the PCMs above 90 ℃. The THEM can determine the thermophysical properties of the PCMs with a temperature higher than 90 ℃ because the cooling curve of pure water taken as the reference material can be fitted and extrapolated to initial cooling temperature of PCMs. The thermophysical properties of erythritol, with melting temperature around 118 ℃, are calculated by the THEM. The results indicate that the thermal conductivity of solid erythritol is in good agreement with reference value and the error between the calculated value of latent heat and the measured by DSC is controlled within 5%. The T-history extrapolation method can be used to determine the properties of the PCMs with a temperature above 90 ℃.
Keywords: T-history extrapolation method (THEM);thermophysical properties;erythritol;latent heat;thermal conductivity
2021, 47(10):52-58  收稿日期: 2020-11-21;收到修改稿日期: 2021-01-12
基金项目: “十三五”国家重点研发计划课题（2016YFC0700903）
作者简介: 马超（1994-），男，河北邢台市人，硕士，主要从事相变储能材料研究
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