摘要
相变蓄热作为一种较为高效的储能方式,为太阳能、风能等可再生能源的高效利用提供了一种技术保障。应用EDEM软件建立了相变胶囊无序堆积床的三维模型,应用FLUENT软件中的凝固融化模型计算了该模型的蓄热特性。在蓄热材料质量相同的情况下,模拟分析了蓄热胶囊粒径和换热流体的流动状态对蓄热能效、蓄热时间、压降及温度分布的影响。研究结果表明,增大换热流体流速可以加快无序堆积床的蓄热进程,但系统的能量效率和内部温度场的均匀性会降低,压降增大;减小蓄热胶囊粒径造成压降增加、蓄热总量减小,但瞬时能量效率得到提高,蓄热用时减少,且无序堆积床的内温度场的均匀性得到改善。
As a more efficient way of energy storage, phase change energy storage technology provides a kind of technology support for the efficient use of renewable energy such as solar energy and wind energy. A 3D model of encapsulated phase change material randomly packed bed was conducted using EDEM, the numerical simulation of the thermal energy storage process was carried out for the EPCM model using the enthalpy-porosity method of the Fluent software. The relationship between fluid velocity, encapsulated size and thermal efficiency, time of energy storage, pressure drops and temperature distribution were investigated for three models under the same conditions of storage material mass. The results show that increasing the flow rate can accelerate the heat storage process and increase the total heat storage capacity, but the energy efficiency of the system decreases, the uniformity of the internal temperature field becomes worse, and the pressure drop increases. Reducing particle size of the heat storage capsule can result in increase in pressure drop and decrease in total heat storage, but the system transient energy efficiency increases, and heat storage period reduces. In addition, the uniformity of temperature field is improved.
作者
张仲彬
刘永强
云爱霞
ZHANG Zhongbinl;LIU Yongqiang;YUN Aixia(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第20期6037-6044,共8页
Proceedings of the CSEE
基金
吉林省科技厅项目(20160203008SF)~~
关键词
相变蓄热
无序堆积
胶囊尺寸
能量效率
温度分布
phase change energy storage
randomly pack
encapsulated size
thermal efficiency
temperature distribution
