新型平板热管相变蓄热器蓄放热性能分析.pdf

第35卷第7期
发电技术
电力建设
2014年7月
新型平救热管相变蕾热器蓄放热性能兮析
叶三宝,刁彦华,赵耀华
(北京工业大学建筑工程学院,北京市100124)
摘要:采用石蜡作为蓄热换热介质,将新型平板热管作为换热元件以强化换热,并在平板热管两侧平面添加纵向翅
片,设计了一套热管式相变储热换热器实验装置,对相变蓄热换热器的蓄、放热特性进行了实验研究。测定了石蜡的温
度分布随时间变化的规律;改变充、放热流体工况,分析了不同流量和流体温度对蓄放热过程的影响。通过分析发现,
新型平板徹热管阵列在相变热器的蓄放热过程很好地发挥了强化传热元件的作用,蓄热过程中,传热流体混度越高
相变材料的熔化速率也越大;放热过程中,相同的流体温度下,随着流体流速的增大,蓄热器的放热速率逐渐增加。实
验结果表明,新型平板热管蓄热器蓄放热效果良好。
关键词:新型平板热管;翅片;相变蓄热;嫆化;凝固
Heat Storage-release Property of Phase-change
Thermal Storage System with New Flat Heat Pipe
YE Sanbao. DIAO Yanhua ZHAO Yaohua
(Architectural ngineering Institute, Beijing University of Technology, Beijing 100124, China)
ABSTRACT: Using a new type of flat heat pipe as efficient heat transfer components, which used paraffin wax as a heat
transfer and storage medium, a new heat-pipe-type phase-change thermal storage heat exchanger was designed and
manufactured which added vertical fins on both sides of the flat heat pipe. A series of experiments for the heat storage
release properties of the phase-change thermal storage heat exchanger were performed the temperature distribution variation
of paraffin with time was measured; the effects of different fluid flow and heat storage temperature on the heat storage-release
process were analyzed, with changing the fluid working conditions of heat storage-release. The analysis results show that the
new flat micro heat pipe array plays a good role as enhanced heat transfer components of the phase-change thermal storage
system in the heat storage-release process; in the heat storage process, the higher temperature of the heat transfer fluid, the
greater melting rate of phase-change materials in the heat release process, the heat release rate of therma storage system
gradually increases with the increase of fluid flow under the same fluid temperature. The experiment results show that the
thermal storage system with new flat heat pipe has good heat storage-release property
KEY WORDS new flat heat pipe; fin; phase change thermal storage; melting; solidification
中图分类号:TM621
文献标志码:A
文章编号:1000-7229(2014)07-0136-0
DOI:10.3969/1j.issn.1000-7229.2014.07.024
节能?,具有广泛的应用前景
0
目前,对于相变蓄热技术的研究主要包括相变材
能源危机和环境污染已经成为制约人类社会发料研究和热物理问题研究。相变材料研究包括不
展的2个重要因素,开发可再生能源和提高能源的利同材料的物性、寿命及稳定性等,热物理问题研究则
用卒其有重的现实意义。我国作为能源消耗大国,主要包括固一液相变传热机理、提高相变材料的导热
能源浪费和利用率低现象尤其严重。相变蓄热技不能力備热装置的强化传热以及不同温度蓄热(换
具有储能密度高、相变过程近似等温等化点,这对于热)器的设计及运行工况等。
解决太阳能和工业余热废热供需时间上的不匹配,实
通过添加高导热卒的材料可以大幅提高传热的速
现电力“移峰英谷”,以及工业建筑和民用建筑空调率,这些强化传热的材料包括金属基体、翅片均匀分
散的高导热粒子和碳纤维等。 Cabeza 8进行了3
基金项目:北京市自然科学基金重点项目(7100201)。种不同材料的强化产热实验,所用材料分别为不锈钢
136hp
C. co. c