石蜡/膨胀石墨复合相变储热单元的放热性能

doi:10.12028/j.issn.2095-4239.2018.0089

储能科学与技术 ›› 2019, Vol. 8 ›› Issue (1): 108-115.doi: 10.12028/j.issn.2095-4239.2018.0089

石蜡/膨胀石墨复合相变储热单元的放热性能

张佳利, 丁宇, 曲丽洁, 何正斌, 伊松林

北京林业大学材料科学与技术学院, 北京 100083

收稿日期:2018-06-11 修回日期:2018-06-28 出版日期:2019-01-01 发布日期:2018-08-28
通讯作者: 伊松林,教授,研究方向为木材加工热处理,E-mail:ysonglin@126.com;何正斌,讲师,研究方向为木材加工热处理,E-mail:hzbcailiao@bjfu.edu.cn。
作者简介:张佳利(1993-),女,硕士研究生,研究方向为太阳能木材干燥储热材料及系统研究与优化设计,E-mail:zjl0520@yeah.net
基金资助:
国家重点研发计划（2016YFD0600701），北京林业大学热点追踪项目（2017BLRD04）。

Discharge performance of a thermal energy storage unit with paraffin-expanded graphite composite phase change materials

ZHANG Jiali, DING Yu, QU Lijie, HE Zhengbin, YI Songlin

College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China

Received:2018-06-11 Revised:2018-06-28 Online:2019-01-01 Published:2018-08-28

摘要/Abstract

摘要： 本工作对石蜡（PA）及石蜡/膨胀石墨（97% PA/3% EG和95% PA/5% EG）复合相变储热材料的热性能进行了探究，考察了不同直径储热单元在干燥介质温度为25℃，风速为0.8 m/s条件下的放热性能。结果表明，在石蜡中添加膨胀石墨后，复合材料导热系数较纯石蜡分别提高了178.10%和214.30%，可以有效改善石蜡的导热性能，缩短放热时间；储热单元直径对放热性能有显著影响，随着石蜡相变储热单元直径的增大，放热时间线性增加；膨胀石墨的添加可以明显缩短放热时间，随膨胀石墨含量的增加，相同直径储热单元的放热时间逐渐缩短；膨胀石墨对储热单元放热性能的改善效果随直径变化而不同，在一定范围内随储热单元直径的增大而效果逐渐显著，达到极值后随直径的增大效果逐渐减弱，本实验条件下，最优储热单元直径在35~50 mm之间。结合实际生产需求，最优直径为35 mm。

关键词: 石蜡, 膨胀石墨, 放热, 相变储热, 储热单元

Abstract: Thermal properties of paraffin wax (PA) and paraffin/expanded graphite (97% PA/3%EG and 95% PA/5%EG) composite materials were investigated. Heat release performance of thermal energy storage (TES) units with different diameters containing the phase change materials were studied at a drying media temperature of 25℃ and a media velocity of 0.8 m·s^-1. The results showed that the thermal conductivity of the composites was increased by 178.10% and 214.30% respectively compared with that of PA, which could shorten the TES unit discharge time. The diameter of the TES unit had a significant effect on the heat release performance. An increase in the diameter of the PA based TES unit leads to a linear increase in the heat release time, whereas an increased EG content reduces the heat release time of the unit for a given TES unit diameter. The effect of EG on the heat release performance of the TES unit increases first and then decreases with increasing diameter, leading to an optimal TES unit diameter of 35 mm under the conditions of this study.

Key words: paraffin wax, expanded graphite, heat release, phase change energy storage, heat storage unit

中图分类号:

TK02

张佳利, 丁宇, 曲丽洁, 何正斌, 伊松林. 石蜡/膨胀石墨复合相变储热单元的放热性能[J]. 储能科学与技术, 2019, 8(1): 108-115.

ZHANG Jiali, DING Yu, QU Lijie, HE Zhengbin, YI Songlin. Discharge performance of a thermal energy storage unit with paraffin-expanded graphite composite phase change materials[J]. Energy Storage Science and Technology, 2019, 8(1): 108-115.

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石蜡/膨胀石墨复合相变储热单元的放热性能

Discharge performance of a thermal energy storage unit with paraffin-expanded graphite composite phase change materials

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