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上海电力学院学报:2019,35(6):525-530
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固体蓄热装置圆形和椭圆形孔自然对流放热特性的研究
(上海电力学院 能源与机械工程学院)
Study on Natural Convection Heat Release Characteristics of Solid Heat Storage Device with Circular and Elliptical Holes
(School of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
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投稿时间:2018-11-28    
中文摘要: 为缓解国家电网压力,根据国家民用建筑供暖标准:GB 50736-2012,设计了固体蓄热式供暖装置。分别开设了不同孔数的圆形或椭圆形孔道,用数值计算的方法研究了自然对流工况下,开设的孔数和孔形对蓄热装置放热特性的影响。结果表明:椭圆形孔道中心线及孔出口温度明显高于圆形孔道相应位置处温度;相同孔形,孔数越多,孔中心温度越高,越有利于放热;孔数越多,孔中心速度越小,与孔形无关;散热开始时,椭圆孔出口温度高于圆孔,但约1.4 h后,椭圆孔出口温度开始低于圆孔,孔数对出口温度影响不大;圆形孔出口温度随时间的延长变化较为平缓。
中文关键词: 固体蓄热装置  自然对流  孔形  孔数
Abstract:In order to reduce the pressure of national electricity grid and responding to the off-peak electricity utilization policy:GB 50736-2012,a solid heat storage device is designed according to the national civil building heating standard.Different numbers of circular and elliptical channels are set up on the heat storage device,and by using numerical calculation to solve the project.The effects of pore shape and number on the heat storage device's heat discharge characteristics were investigated with the condition of natural convection.The results show that the temperature of the center line and the outlet temperature of the ellipse channel is obviously higher than that at the corresponding position in the circular channel.While the shape of the hole is the same,large channel numbers make the center temperature of the hole higher,thus more beneficial to heat discharge performance of solid heat storage device.The bigger the hole number is,the smaller the velocity of the center is.However,the pore shape has little effect on the center speed.At the beginning of the heat release,the outlet temperature of the elliptical hole is higher than that of the circular hole.While about 1.4 hours later,the outlet temperature of the elliptical hole begins to be lower than that of the circular hole,and the number of holes has little effect on the outlet temperature.The exit temperature of circular hole changes more slowly with time.
文章编号:     中图分类号:TK11    文献标志码:
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引用文本:
李晶晶,李永光,王治源,等.固体蓄热装置圆形和椭圆形孔自然对流放热特性的研究[J].上海电力学院学报,2019,35(6):525-530.
LI Jingjing,LI Yongguang,WANG Zhiyuan,et al.Study on Natural Convection Heat Release Characteristics of Solid Heat Storage Device with Circular and Elliptical Holes[J].Journal of Shanghai University of Electric Power,2019,35(6):525-530.