多孔介质蓄热系统动态蓄热特性试验与表征  

Experimental research and characterization of dynamic heat storage properties of heat storage system with porous media

作　　者：闫珂 程乐鸣[1] 张维国 施正展[1] 邱坤赞[1] YAN Ke;CHENG Le-ming;ZHANG Wei-guo(College of Energy Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]浙江大学能源工程学院,浙江杭州310027

出　　处：《能源工程》2020年第1期45-51,共7页Energy Engineering

基　　金：能源清洁利用国家重点实验室(浙江大学)自主课题(ZJUCEU2017009)。

摘　　要：为了解多孔介质蓄热材料热动态条件下的蓄热特性,得到表征蓄热材料的动态蓄热特性参数,在120 kW多孔介质热动态蓄热系统中,对不同孔径(2.9、4、5.5 mm)、长度(100~400 mm)的蜂窝多孔陶瓷蓄热体在不同热烟气条件下的动态蓄热特性包括蓄热速率、蓄热效率、蓄存单位热量所要克服的蓄热阻力进行了试验研究。结果表明:蓄热速率与时间的关系呈"抛物线"状,蓄热效率随蓄热时间的进行逐渐降低。相同时间下蓄热速率及单位蓄热阻损随蓄热体比表面积的增大或孔径的减小而增大,蓄热效率随蓄热体长度的增加而增大。根据试验研究和分析,采用蓄热速率、蓄热效率及单位蓄热阻损可以用来表征多孔蓄热体的动态蓄热特性。In order to investigate the dynamic heat storage characteristics of porous media,a dynamic heat storage system(120 kW)with honeycomb ceramics was developed.Heat storage rate,efficiency and unit heat storage resistance were experimentally studied.Cell size of the honeycomb varied from 2.9 mm to 5.5 mm and length varied from 100 mm to 400 mm.The results show that relationship between the heat storage rate and time is parabolic,and the heat storage efficiency decreases with time.At same time,heat storage rate and unit heat storage resistance rise with the increase of the specific surface area or the decrease of cell size,heat storage efficiency increases with the increase of honeycomb length.Based on experimental research and analysis,the heat storage rate,heat storage efficiency and unit heat storage resistance can be used to characterize the heat storage characteristics of the porous media.

关 键 词：多孔介质 热力学 动态 蓄热 蓄热速率 蓄热效率 蓄热阻 

分 类 号：TK02[动力工程及工程热物理]