太阳能热发电复合相变蓄热材料的实验研究

李勇 1; 郭蓓 1; 黄官飞 1; 谭书鹏 1; 河合武 1; 宫保修一 2; 束鹏程 1

doi:10.7652/xjtuxb201403010

您当前的位置：

首页 >

文章列表页 >

太阳能热发电复合相变蓄热材料的实验研究

更新时间：2025-04-29

- 太阳能热发电复合相变蓄热材料的实验研究
- Experimental Investigation on Phase Change Thermal Storage Material Composite for Solar Energy Thermal Power
- 西安交通大学学报 2014年48卷第3期页码：49-53+95
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403010
  中图分类号： TK512.4
- 网络首发：2014-03-10，
  
  纸质出版：2014
- 稿件说明：
移动端阅览
李勇 1, 郭蓓 1, 黄官飞 1, 等. 太阳能热发电复合相变蓄热材料的实验研究[J]. 西安交通大学学报, 2014,48(3):49-53+95.

Experimental Investigation on Phase Change Thermal Storage Material Composite for Solar Energy Thermal Power[J]. 2014, 48(3): 49-53+95.
李勇 1, 郭蓓 1, 黄官飞 1, 等. 太阳能热发电复合相变蓄热材料的实验研究[J]. 西安交通大学学报, 2014,48(3):49-53+95. DOI： 10.7652/xjtuxb201403010.

Experimental Investigation on Phase Change Thermal Storage Material Composite for Solar Energy Thermal Power[J]. 2014, 48(3): 49-53+95. DOI： 10.7652/xjtuxb201403010.

摘要

针对相变材料无机盐KNO

/NaNO

(摩尔比50/50)导热系数低

影响了蓄热系统充放热过程传热效率

制备了适用于太阳能热发电系统的无机盐/膨胀石墨复合相变材料

对复合相变材料的微观结构和热物性进行了分析

并搭建充放热测试平台对相变材料分别进行了热性能研究。结果表明:复合相变材料中的无机盐均匀分布在膨胀石墨中

其相变潜热与基于复合材料中无机盐质量分数的计算值相当

添加膨胀石墨后相变材料的导热系数得到了改善; 在充热过程中纯无机盐的换热方式以自然对流为主

同一蓄热单元内沿轴向上下位置温差较大

不同蓄热单元内相同位置完成充热过程所需时间从上到下依次增加

而对于无机盐/膨胀石墨复合相变材料(质量比90/10)充热过程以导热为主; 与纯无机盐不同

同一蓄热单元内沿轴向上下位置温度变化趋势基本一致

不同蓄热单元相同位置完成充热过程所需时间几乎没有差别。添加膨胀石墨后

相变材料的充热过程所需时间减少较小

而放热过程所需时间减少约45%

传热介质流量的变化对复合相变材料充/放热过程影响较小。

Abstract

Low thermal conductivity of inorganic salt KNO

/NaNO

(mole ratio 50/50)usually leads to low heat transfer efficiency of thermal energy storage(TES)system. Thus a phase change material(PCM)composite with inorganic salt and expanded natural graphite(ENG)for solar energy thermal power is prepared. The micro-structures and thermal properties are analyzed

and an experimental heat charging/discharging system is set up for testing the heat transfer performance of the PCM. The results show that the solid inorganic salt is uniformly distributed on the ENG powder inside PCM composite and the latent heat of P

CM composite gets equal to the calculation of the mass ratio of inorganic salt. The thermal conductivity of PCM is enhanced after inserting ENG. The heat transfer in pure PCM is mainly controlled by natural convection

which results in a large temperature difference from top to bottom along the axial direction in the same TES unit

and the time for completing charging at the same positions in different units increases from top to bottom. For PCM composite(mass ratio 90/10)

the heat transfer is mainly driven by thermal conductivity in charging process. The temperature variations are almost the same at the same locations in the radial direction in a unit

and the time for completing charging at the same positions in different units remains constant. After adding ENG into inorganic salt

the time for PCM completing charging decreases slightly

while the time for discharging reduces by 45%. The changed oil flow rates exert little influence on the heat transfer in PCM composite.

关键词

Keywords

references

AGYENIM F, HEWITT N, EAMES P, et al. A review of materials, heat transfer and phase change problem formulation for latent heat thermal energy storage systems(LHTESS)[J]. Renewable & Sustainable Energy Reviews, 2010, 14(2): 615-628.

KENISARIN M M. High-temperature phase change materials for thermal energy storage[J]. Renewable Sustainable Energy Reviews, 2010, 14(3): 995-970.

LIU M, SAMAN W, BRUNO F. Review on storage materials and thermal performance enhancement techniques for high temperature phase change thermal storage systems[J]. Renewable Sustainable Energy Reviews, 2012, 16(4): 2118-2132.

ZALBA B, MARIN J M, CABEZA L F, et al. Review on thermal energy storage with phase change: materials, heat transfer analysis and applications[J]. Applied Thermal Engineering, 2003, 23(3): 251-283.

VELRAJ R, SEENIRAJ R V, HAFNER B, et al. Experimental analysis and numerical modeling of inward solidification on a finned vertical tube for a latent heat storage unit[J]. Solar Energy, 1997, 60(5): 281-290.

FUKAI J, HAMADA Y, MOROZUMI Y, et al. Improvement of thermal characteristics of latent heat thermal energy storage units using carbon-fiber brushes: experiments and modeling[J]. International Journal of Heat and Mass Transfer, 2003, 46(23): 4513-4525.

李文强, 屈治国, 陶文铨. 金属泡沫内固-液相变数值模拟研究[J].工程热物理学报, 2013, 34(1): 141-144.

LI Wenqiang, QU Zhiguo, TAO Wenquan. Numerical study of solid-liquid phase change in metallic foam[J]. Journal of Engineering Thermophysics, 2013, 34(1): 141-144.

ZHAO C Y, WU Z G. Heat transfer enhancement of high temperature thermal energy storage using metal foams and expanded graphite[J]. Solar Energy Materials and Solar Cells, 2011, 95(2): 636-643.

MICHELS H, PITZ-PAAL R. Cascaded latent heat storage for parabolic trough solar power plants[J]. Solar Energy, 2007, 81(6): 829-837.

ACEM Z, LOPEZ J, BARRIO E P. KNO3/NaNO3-graphite materials for thermal energy storage at high temperature: Part I Elaboration methods and thermal properties[J]. Applied Thermal Engineering, 2010, 30(13): 1580-1585.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

采用拓扑优化液冷与相变材料协同的大圆柱电池热管理

隧道内燃料电池汽车氢气泄漏扩散特性及影响因素

结构-语义-残差协同的图像压缩框架：面向隐私保护与高保真重建

采用试验设计方法的第三代CO2气体箔轴承箔片几何参数敏感性分析

张角凹坑气膜孔对双层壁气膜冷却特性的影响