带有空穴的相变胶囊蓄热过程分析

doi:10.16085/j.issn.1000-6613.2017.06.022

摘要/Abstract

摘要： 相变蓄热是一种高效的蓄热方式，为太阳能、风能等可再生能源的高效转化和利用提供了保障。本文建立了带有空穴的相变蓄热胶囊的二维模型，应用Fluent软件中的多相流模型（VOF）和凝固融化模型对带有空穴的相变蓄热胶囊的蓄热过程进行了模拟计算。在计算过程中考虑了空穴、重力及相变材料融化过程中浮升力对蓄热过程的影响，同时分析了外部导热流体的流速、相对于重力方向的流向及由于相变蓄热胶囊不同的排布密度导致的不同阻塞率等因素对相变蓄热胶囊蓄热过程的影响。结果表明：相变蓄热胶囊内部空穴的存在使蓄热过程变缓，适当增加外部导热流体的流速和阻塞率可以加快蓄热过程的进程，而导热流体的流向对蓄热效果的影响很小。研究结果为相变蓄热胶囊研究与应用提供了一定的参考依据。

关键词: 蓄热胶囊, 相变, 空穴, 影响因素

Abstract: Phase change energy storage technology is an efficient way of energy storage which guarantees the the efficient conversion and utilization of renewable energy, such as solar and wind energy. A two dimensional model of the encapsulated phase change materials(EPCM)with an air void is developed in this paper. The numerical simulation of the thermal energy storage process was conducted for the EPCM model using the enthalpy-porosity method and volume of fluid method(VOF)of the Fluent software. The effect of gravity,buoyancy-driven convection and the air void in the capsule, on the thermal energy storage process was considered. At the same time, the effect of various velocities and flow directions relative to gravity of the heat transfer fluid(HTF)and the blockage ratios on encapsulated phase change were studied. The results showed that the flow direction of HTF had little effect on the thermal energy storage process. However, the air void in capsule had negative effect on the thermal energy storage process. With the proper ratios of velocity to the blockage, the thermal energy storage process of the EPCM would be accelerated. The results provide a reference for the future research and application of the EPCM.

Key words: EPCM, phase change, air void, influencing factors

中图分类号:

TK02

张仲彬, 刘永强, 姜铁骝, 李勇. 带有空穴的相变胶囊蓄热过程分析[J]. 化工进展, 2017, 36(06): 2123-2130.

ZHANG Zhongbin, LIU Yongqiang, JIANG Tieliu, LI Yong. Analysis of thermal energy storage for encapsulated phase change material with a void[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2123-2130.

参考文献

[1] 张海峰,葛新石,叶宏.相变胶囊的蓄放热特性分析[J].太阳能学报,2005,26(6):825-830. ZHANG Haifeng,GE Xinshi,,YE Hong.Characteristics of the heat change and discharge of the encapsulated phase change materials[J].Acta Energiae Solaris Sinica,2005,26(6):825-830.
[2] 曾令达,刘海燕,宋婧,等.蓄热储能相变复合材料的研究及其进展[J].材料研究与应用,2008,2(4):479-482. ZENG Lingda,LIU Haiyan,SONG Qian,et al.Research progress on the thermal energy storage compound phase change materials[J].Materials Research and Application,2008,2(4):479-482.
[3] 杨超,张东,李秀强.相变蓄热微胶囊研究现状及应用[J].储能科学与技术,2014,3(3):203-209. YANG Chao,ZhANG Dong,LI Xiuqiang.Research and application of microencapsulated phase change materials[J].Energy Storage Science and Technology,2014,3(3):203-209.
[4] 徐伟强,袁修干,邢玉明,等.空穴分布对固液相变蓄热过程的影响[J].太阳能学报,2011,32(2):240-245. XU Weiqiang,YUAN Xiugan,XING Yuming,et al.Effects of void distribution on solid-liquid phase change material storage[J].Acta Energiae Solaris Sinica,2011,32(2):240-245.
[5] 董克用,袁修干,邢玉明.不同空穴位置下固液相变换热过程的差别[J].航空学报,1999,20(s):27-29. DONG Keyong,YUAN Xiugan,XING Yuming.Differences of solid-liquid phase change heat transfer process between different void positions[J].Acta Aeronautica et Astronautica Sinca,1999,20(s):27-29.
[6] 袁修干,王长河,董克用,等.微重力下固液相变传热过程中空穴分布的影响[C]//中国工程热物理学会传热传质学术会议,北京,1998. YUAN Xiugan,WANG Changhe,DONG Keyong,et al.The influence of void distributions on solid-liquid phase change heat exchange process under microgravity condition[C]//Conference on Heat and Mass Transfer,CSET,Beijing,1998.
[7] 邢玉明,崔海亭,袁修干,等.微重力下高温固液相变蓄热器内空穴分布[J].太阳能学报,2003,24(2):183-188. XING Yuming,CUI Haiting,YUAN Xiugan,et al.Initial study of void formation of high temperature solid-liquid phase change thermal energy storage canister in microgravity[J].Acta Energiae Solaris Sinica,2003,24(2):183-188.
[8] 菅鲁京,霍玉华,苗建印,等.微重力条件下固液相变过程空穴移动特性研究[J].航空器环境工程,2014,31(1):31-36. JIAN Lujing,HUO Yuhua,MIAO Jianyin,et al.Void migration characteristics during solid-liquid phase process under microgravity condition[J].Spacecraft Environment Engineering,2014,31(1):31-36.
[9] 崔海亭,袁修干,候欣宾.蓄热技术的研究进展与应用[J].化工进展,2002,21(1):23-25. CUI Haiting,YUAN Xiugan,HOU Xinbin.Research on and application of the thermal energy storage[J].Chemical Industry and Engineering Process,2002,21(1):23-25.
[10] 鲍泽威,吴震,NYALLANG Nyamsi Serge,等.金属氢化物高温蓄热技术的研究进展[J].化工进展,2012,31(8):1665-1670. BAO Zewei,WU Zhen,NYALLANNG Nyamsi Serge,et al.Process of high temperature heat storage technology using metal hydrides[J]. Chemical Industry and Engineering Process,2012,31(8):1665-1670.
[11] 谢望平,汪南,朱冬生,等.相变材料强化传热研究进展[J].化工进展,2008,27(2):190-195. XIE Wangping,WANG Nan,ZHU Dongsheng,et al.Review of heat transfer enhancement of the PCMs[J]. Chemical Industry and Engineering Process,2008,27(2):190-195.
[12] 杨波,李汛,赵军.移动蓄热技术的研究进展[J].化工进展,2013,32(3):515-520. YANG Bo,LI Xun,ZHAO Jun.Research process of mobilized thermal energy storage technology[J].Chemical Industry and Engineering Process,2013,32(3):515-520.
[13] 李介夫,王光,李卫国,等.一种利用混合储能系统平抑风光功率波动的控制策略[J].东北电力大学学报,2014,34(5): 32-38. LI Jiefu,WANG Guang,LI Weiguo,et al.A control strategy to smooth the power of wind and photovoltaic generation with hybrid energy storage systems [J].Journal of Northeast Dianli University,2014,34(5):32-38.
[14] ELMOZUGHI A,SOLOMON L,OZTEKIN A,et al.Encapsulated phase change material for high temperature thermal energy—Heat transfer analysis[J].International Journal Heat and Mass Transfer,2014,78:1135-1144.
[15] SOLOMON L,ELMOZUGHI A,OZTEKIN A,et al.Effect of internal void placement on the heat transfer performance— Encapsulated phase change material for energy storage[J]. Renewable Energy,2015,78:438-447.
[16] 袁修干,徐伟强.相变蓄热技术的数值仿真及应用[M].北京:国防工业出版社,2013:1-22. YAN Xiugan,XU Weiqiang.Numerical simulation and application of phase change thermal storage technology[M].Beijing:National Defense Industry Press,2013:1-22.
[17] ZHAO Weihua,ELMOZUGHI A,OZTEKIN A,et al.Heat transfer analysis of encapsulated phase change material for thermal energy storge[J]. International Journal Heat and Mass Transfer,2013,63:323-335.
[18] REVANKAR S,CROY T.Visualization study of the shrinkage void distribution in thermal energy storage capsules of different geometry[J].Experimental Thermal and Fluid Science,2007,31:181-189.
[19] 刘光启,马连湘,邢志有.化工物性算图手册[M]. 北京:化学工业出版社,2002:203-204. LIU Guangqi,MA Lianxiang,XING Zhiyou.Handbook of chemical property chart[M]. Beijing:Chemical Industry Press,2002:203-204.
[20] ASSIS E,ZISKIND K,LETAN R.Numerical and experimental study of solidification in a spherical shell[J],Journal of Heat Transfer,2009,131:273-289.
[21] BUYRUK E.Heat transfer and flow structure around circular cylinder in cross-flow[J].Transfer Journal of Engineering and Environmental Science,1999,23:299-325.
[22] ASHJAEE M,AMIRI S,HABIBI K.Slot jet impingement heat transfer from an isothermal circular cylinder[J].Thermal Issues in Emerging Technologies,2008,2:399-404.