化工学报 ›› 2020, Vol. 71 ›› Issue (4): 1580-1587.doi: 10.11949/0438-1157.20190886

• 流体力学与传递现象 • 上一篇    下一篇

相变套管式储热系统放冷性能实验研究

白志蕊1(),徐洪涛1(),屈治国2,张剑飞2,苗玉波1   

  1. 1.上海理工大学能源与动力工程学院, 上海市动力工程多相流动与传热重点实验室，上海 200093
    2.西安交通大学能源与动力工程学院, 热流科学与工程教育部重点实验室，陕西 西安 710049
  • 收稿日期:2019-08-05 修回日期:2019-12-24 出版日期:2020-04-05 发布日期:2020-01-04
  • 通讯作者: 徐洪涛 E-mail:baizr210@163.com;htxu@usst.edu.cn
  • 作者简介:白志蕊（1995—），女，硕士研究生， baizr210@163.com
  • 基金资助:
    国家重点研发计划项目(2018YFF0216003);上海市国际科技合作基金项目(18160743600)

Experimental study of phase change sleeve tube thermal storage system performance during charging

Zhirui BAI1(),Hongtao XU1(),Zhiguo QU2,Jianfei ZHANG2,Yubo MIAO1   

  1. 1.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
  • Received:2019-08-05 Revised:2019-12-24 Online:2020-04-05 Published:2020-01-04
  • Contact: Hongtao XU E-mail:baizr210@163.com;htxu@usst.edu.cn

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摘要：

搭建了套管式相变储热实验系统，分别填充不同质量分数膨胀石墨与正十五烷制备而成的复合相变材料，对系统进行重复充放冷循环实验。采用有效储热比Est和储能效率ε来表征系统性能，研究了复合相变材料中换热增强对套管式潜热储能系统放冷性能的影响。结果表明：同Re数下，相变材料热导率为0.14 W·m-1·K-1（工况A）放冷结束时间为1770 s，相同Re条件下热导率提升至7.10 W·m-1·K-1（工况B）和11.60 W·m-1·K-1（工况C）的结束时间分别可缩短77.3%、78.9%；热导率的增加可显著提高系统有效储热比Est和储能效率ε，热导率从0.14 W·m-1·K-1增加到11.60 W·m-1·K-1，Est在层流区、过渡区和湍流区分别可提升33.3%、350.0%及129.6%，ε分别可提升26.8%、52.9%及14.6%；Re的增加使得工况A和工况B中Est和ε呈现下降趋势，工况C中Est在Re=4298出现峰值1.62。

关键词: 相变套管式储热系统, 复合材料, 相变, 热传导, 有效储热比

Abstract:

In this paper, a casing type phase change heat storage experiment system is set up, which is filled with composite phase change materials made of expanded graphite and n-pentadecane with different mass fractions, and the system is charged and discharged repeatedly . The heat transfer enhancement of the sleeve tube thermal storage system was characterized by effective heat storage ratio Est and energy storage efficiency ε. The results show that the discharging process was completed by 1770 s (Condition A, kp =0.14 W·m-1·K-1). The completed time for Condition B (kp =7.10 W·m-1·K-1) and Condition C (kp =11.60 W·m-1·K-1) were shortened by 77.3% and 78.9% under the same Reynolds number. Est and ε of the system increase significantly with the increasing thermal conductivity. As the thermal conductivity increases from 0.14 W·m-1·K-1 to 11.60 W·m-1·K-1, Est increased by 33.3%, 350.0% and 129.6% in the laminar region, transition region and turbulent region, and ε increased by 26.8%, 52.9% and 14.6% respectively. However, Est and ε decrease as Re increases in Condition B and Condition C. Est in Condition C shows a peak of 1.62 at Re = 4298.

Key words: phase change sleeve tube thermal storage system, composites, phase change, heat Conduction, effective heat storage ratio

中图分类号: 

  • TK 123

图 1

相变材料强化储热实验系统图"

图 2

实验LHTES系统布置图"

表 1

复合PCM物性参数"

样品编号

EG质量分数

ω/%

相变温度

Tp/℃

密度ρp/

(kg·m-3)

比热容（固/液）

cp,p/(kJ·kg-1·℃-1)

热导率

kp /(W·m-1·K-1)

相变潜热

L/(kJ·kg-1)

工况 A0107693.323/2.1840.14168
工况 B15108502.001/1.4797.10135
工况 C30109002.238/1.61011.60100

图3

放冷过程中PCM温度Tpi及HTF温度Thi随时间变化的曲线"

图4

Re=4298时工况 C中Est、ε及Qeff与出口温度之间的关系"

图5

不同工况下系统的性能指标分布"

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