A new heat transfer model of phase change material based on energy asymmetry
A new heat transfer model of phase change material based on energy asymmetry
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DOI：
10.1016/j.apenergy.2017.12.103
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发表时间：
2018-02
期刊：
影响因子：
11.2
通讯作者：
Xing Jin;H. Hu;Xing Shi;Xin Zhou;Liu Yang;Yonggao Yin;Xiao-song Zhang
中科院分区：
文献类型：
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作者：
Xing Jin;H. Hu;Xing Shi;Xin Zhou;Liu Yang;Yonggao Yin;Xiao-song Zhang
传统的相变材料传热模型通常将相变材料的熔化和凝固过程看作是对称的，但使用这些模型进行计算不可避免地会产生误差。本文基于能量不对称性建立了相变材料的传热模型，并通过实验数据进行了验证。发现相变材料的熔化温度范围和凝固温度范围不一致以及冷却过程中的过冷问题是导致相变材料能量不对称的两个主要原因。无论是单次热循环还是多次热循环，非对称模型和对称模型的计算结果都不同。显然，与对称模型相比，非对称模型具有更高的精度，非对称模型中的加热/冷却过程更符合PCM的真实的加热/冷却过程。
The melting process and the solidifying process of phase change material (PCM) are usually considered symmetrical in the traditional PCM heat transfer models, but there are inevitable calculation errors using these models. In this paper, a new heat transfer model of PCM based on the energy asymmetry was built, and it was validated by experimental data. It was found that the two main reasons for the energy asymmetry of the PCM were the melting temperature range and the solidifying temperature range were not the same and the supercooling problem during the cooling process. No matter for only one thermal cycle or for the multiple thermal cycles, the results from the asymmetrical model and the symmetrical model were different. Apparently, compared with the symmetrical model, the asymmetrical model had higher accuracy, and the heating/cooling process in the asymmetrical model was more consistent with the real heating/cooling process of the PCM.