采用有限元方法模拟圆柱体潜热蓄热系统中的相变蓄热过程。该模型为：以圆柱体封装装置存储相变物质石蜡，圆柱体中间插入一根热水铜管给相变物质供热，不同数量的铜肋片或者不同质量分数的压缩膨胀石墨用于提高相变传热速率。其中铜肋片沿圆柱体径向方向插入圆柱体内；熔融石蜡经过真空浸渗到压缩膨胀石墨内形成压缩膨胀石墨/石蜡复合材料，然后将复合材料填充到圆柱体内。该模型包括四个物理过程：热传导、流体流动、相变传热和对流传热。模拟结果表明，不同数量的铜肋片以及不同质量分数的压缩膨胀石墨对相变储热速率均有明显提高。添加压缩膨胀石墨比添加铜肋片更经济，传热更均匀。
A cylindrical phase change energy storage system was modeled numerically using the finite element method. The model system was composed of a cylindrical container into the center of which is inserted concentrically a copper pipe carrying hot water. Either copper fins or compressed expanded natural graphite ( CENG) were placed as heat-conducting fillers between the container and the pipe for comparison. The former is radially positioned while the latter is randomly filled. The remaining space was filled with paraffin as a phase change energy storage material. Fluid flow, heat conduction and convection, and the paraffin phase change were simulated simultaneously. It was found that the heat transfer performance of the system increases with the number of copper fins when they were used as the filler. The time required to reach heat equilibrium is shortened significantly by increasing the density of the CENG when it was used. CENG is much more effective than copper fins to promote paraffin melting.
参考文献
| [1] | Wei-Biao Ye;Dong-Sheng Zhu;Nan Wang .Numerical simulation on phase-change thermal storage/release in a plate-fin unit[J].Applied thermal engineering: Design, processes, equipment, economics,2011(17/18):3871-3884. |
| [2] | Yasar Demirel;H. Huseyin Ozturk .Thermoeconomics of seasonal latent heat storage system[J].International journal of energy research,2006(12):1001-1012. |
| [3] | Belen Zalba;Jose M Marin;Luisa F. Cabeza;Harald Mehling .Review on thermal energy storage with phase change: materials, heat transfer analysis and applications[J].Applied thermal engineering: Design, processes, equipment, economics,2003(3):251-283. |
| [4] | Dincer I .Thermal energy storage systems as a key technology in energy conversion[J].INTERNATIONAL JOURNAL OF ENERGY RESEARCH,2002,26(07):567-588. |
| [5] | K.C. Nayak;S.K. Saha;K. Srinivasan;P. Dutta .A numerical model for heat sinks with phase change materials and thermal conductivity enhancers[J].International Journal of Heat and Mass Transfer,2006(11/12):1833-1844. |
| [6] | Chaxiu Guo;Wujun Zhang .Numerical simulation and parametric study on new type of high temperature latent heat thermal energy storage system[J].Energy conversion & management,2008(5):919-927. |
| [7] | Khodadadi J M;Hosseinizadeh S F .Nanoparticle-enhanced phase change materials(NEPCM)with great potential for improved thermal energy storage[J].INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER,2007,34(05):534-543. |
| [8] | 邹得球,肖睿,宋文吉,冯自平.一种余热利用相变石蜡储热过程的数值模拟[J].热能动力工程,2010(01):77-81. |
| [9] | 彭冬华,陈振乾,施明恒.泡沫金属内相变材料融化传热过程的数值模拟[J].工程热物理学报,2009(06):1025-1028. |
| [10] | 夏莉,张鹏,王如竹.具有自由表面的固-液相变的数值模拟与实验研究[J].热能动力工程,2010(05):505-509. |
| [11] | 卢涛,姜培学.多孔介质融化相变自然对流数值模拟[J].工程热物理学报,2005(z1):167-170. |
| [12] | Yue-Tzu Yang;Yi-Hsien Wang.Numerical simulation of three-dimensional transient cooling application on a portable electronic device using phase change material[J].International Journal of Thermal Sciences,2012:155-162. |
| [13] | Mithat Akgun;Orhan Aydin;Kamil Kaygusuz .Thermal energy storage performance of paraffin in a novel tube-in-shell system[J].Applied thermal engineering: Design, processes, equipment, economics,2008(5-6):405-413. |
| [14] | Yajuan Zhong;Sizhong Li;Xinghai Wei .Heat transfer enhancement of paraffin wax using compressed expanded natural graphite for thermal energy storage[J].Carbon: An International Journal Sponsored by the American Carbon Society,2010(1):300-304. |
| [15] | Dominic G;Wilson O.Solid-liquid phase change simulation applied to a cylindrical latent heat energy storage system[A]. |
| [16] | Lacroix M .Contact melting of a phase change material inside a heated parallelepedic capsule[J].Energy Conversion and Management,2001,42(01):35-47. |
| [17] | Voller V R;Prakash C .A fixed grid numerical modeling method-ology for convection-diffusion mushy region phase change prob-lems[J].International Journal of Heat and Mass Transfer,1987,30(08):1709-1719. |
| [18] | Xianglei Wang;Quangui Guo;Yajuan Zhong;Xinghai Wei;Lang Liu .Heat transfer enhancement of neopentyl glycol using compressed expanded natural graphite for thermal energy storage[J].Renewable energy,2013(Mar.):241-246. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%