Heat transfer characteristics of shell-tube latent thermal energy storage system

ZHANG Peng; XIAO Xin; WANG Ruzhu; LI Ming

doi:10.3969/j.issn.0438-1157.2012.z2.003

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Heat transfer characteristics of shell-tube latent thermal energy storage system

更新时间：2025-12-10

- Heat transfer characteristics of shell-tube latent thermal energy storage system
- CIESC Journal Issue S2, Pages: 14-20(2012)
- 作者机构：
  
  1. 上海交通大学制冷与低温工程研究所,上海,200240
  2. 云南师范大学太阳能研究所,云南,昆明,650092
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.z2.003
  CLC： K02
- Online First：28 December 2012，
  
  Published：28 December 2012
- 稿件说明：
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ZHANG Peng, XIAO Xin, WANG Ruzhu, et al. Heat transfer characteristics of shell-tube latent thermal energy storage system[J]. CIESC Journal, 2012, (S2): 14-20.
DOI：

ZHANG Peng, XIAO Xin, WANG Ruzhu, et al. Heat transfer characteristics of shell-tube latent thermal energy storage system[J]. CIESC Journal, 2012, (S2): 14-20. DOI： 10.3969/j.issn.0438-1157.2012.z2.003.

摘要

针对目前石蜡潜热蓄能系统效率低下的特点

构建了石蜡/膨胀石墨混合相变材料的潜热蓄能系统

研究了其蓄/放热特性

并与纯石蜡相变材料系统进行了对比分析

讨论了不同换热流体流量下的蓄/放热过程的时间周期。用焓法处理相变区域

对该潜热蓄能系统的整体蓄热过程进行数值模拟。研究结果表明

对于石蜡／膨胀石墨复合相变材料

其导热性能较纯石蜡有很大提高

但由于添加了膨胀石墨而减弱了蓄热中石蜡的对流换热。流量提高对蓄/放热速率有明显的改善。焓法模型能全面反映蓄能系统的换热与流动特性

数值计算的结果与实验数据吻合较好。

Abstract

The charging and discharging characteristics of a latent thermal energy storage(LTES)system using pure paraffin and composite paraffin/expanded graphite(EG)PCMs were experimentally investigated.The results showed that the thermal conductivity of the composite PCM was distinctly enhanced

whereas natural convection was hampered because the paraffin was confined in the porous structure of the EG.The time-durations of the charging and discharging processes with different flow rates for heat storage/retrieval were discussed.The time-duration of composite PCM during the discharging process was reduced more than that during the charging process

and the charging and discharging rates could be improved significantly with the higher flow rate.The charging process of the LTES system was numerically investigated with enthalpy method

which was verified by the experimental results.

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