泡沫金属铜/石蜡相变蓄热过程的数值模拟

doi:10.11949/j.issn.0438-1157.20181268

摘要/Abstract

摘要：

在装有纯石蜡的相变蓄热箱中加入泡沫金属铜，利用Fluent软件，模拟研究石蜡相变蓄热箱在加入泡沫金属铜后，箱内石蜡温度分布的均匀性、稳定性及相变蓄热的变化规律。模拟结果显示，泡沫金属铜的加入，大大提高了石蜡的蓄热性能，缩短了石蜡相变的时间；且加入泡沫铜后，石蜡内部温差明显减小，温度分布更加均匀，并且有效缓解了自然对流造成的顶部过热和底部不熔化现象。数值模拟结果与实验测试数据平均误差15.7%，与实测值吻合较好。

关键词: 相变蓄热, 泡沫金属铜, 冷凝热回收, 数值模拟, 对流, 热传导

Abstract:

The uniformity and stability of the paraffin temperature distribution in the phase change heat storage box with the addition of foam copper into the pure paraffin were predicted by Fluent software. The simulated results showed that the addition of foam copper greatly improved the heat recovery performance of paraffin and shortened paraffin phase transition time. Moreover, after adding foam copper, the paraffin inside temperature difference decreased significantly, the temperature distribution became more uniform, and top overheating and bottom un-melting caused by nature convection were effectively alleviated. The average error between the simulated results and test data were within 15.7%, which was in good agreement with the measured values.

Key words: phase change heat storage, foamed metal copper, condensation heat recovery, numerical simulation, convection, heat conduction

中图分类号:

TU 831.6

陈华, 柳秀丽, 杨亚星, 钟丽琼, 王蕾, 高娜. 泡沫金属铜/石蜡相变蓄热过程的数值模拟[J]. 化工学报, 2019, 70(S1): 86-92.

Hua CHEN, Xiuli LIU, Yaxing YANG, Liqiong ZHONG, Lei WANG, Na GAO. Numerical simulation of foam metal copper/paraffin phase change thermal storage process[J]. CIESC Journal, 2019, 70(S1): 86-92.

图/表 8

图1 相变蓄热装置物理模型

Fig.1 Physical model of phase change thermal storage device

图2 箱体结构及热电偶测点布置图

Fig.2 Box structure and thermocouple measuring point layout

图4 石蜡相变蓄热箱内相变过程中液相率随时间的变化情况

Fig.4 Change of liquid phase rate over time during phase transition in paraffin phase change heat storage tank

图5 纯石蜡与加入泡沫铜的石蜡液相率变化规律

Fig.5 Comparison of paraffin liquid phase ratio of pure paraffin and foamed copper

图6 石蜡相变蓄热箱内相变过程中温度场随时间的变化情况

Fig.6 Variation of temperature field with time during phase transition in paraffin phase change heat storage tank

图7 相变箱测点1温度模拟值比较

Fig.7 Comparison of temperature simulation value of phase change box at test point 1

图8 相变箱测点2温度模拟值比较

Fig .8 Comparison of temperature simulation values of phase change box at test point 2

图9 相变箱测点3温度模拟值比较

Fig.9 Comparison of temperature simulation values of phase change box at test point 3

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