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DOI:
上海电力学院学报:2019,35(6):-
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蓄热固体圆和椭圆孔自然对流放热特性的研究
李晶晶, 李永光
(上海电力学院)
Simulation on heat release characteristics of solid heat storage device with circular and elliptical holes in natural convection
liyongguang
(Shanghai University of Electric Power)
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投稿时间:2018-11-28    修订日期:2019-01-05
中文摘要: 为清洁供暖优化用户侧电力负荷,本文根据国家民用建筑供暖标准设计固体蓄热式供暖装置,在其中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,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,其与孔形无关;散热开始时,椭圆孔出口温度高于圆孔的,但约1.4小时后,椭圆孔出口温度开始低于圆孔的,孔数对出口温度影响不大。圆形孔出口温度随时间延长变化较平缓。
中文关键词: 自然对流  蓄热体  放热特性  孔形  孔数  清洁供暖  数值计算  
Abstract:In order to optimize the power load on the user side of the clean heating system, a solid heat storage device was designed according to the national civil building heating standard. Different numbers of circular and elliptical channels were 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 makes the center temperature of the hole higher ,thus being more beneficial to heat discharge performance of solid heat storage device.The more the hole number is, the smaller the velocity of the center is.However 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.
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李晶晶,李永光.蓄热固体圆和椭圆孔自然对流放热特性的研究[J].上海电力学院学报,2019,35(6):.
liyongguang.Simulation on heat release characteristics of solid heat storage device with circular and elliptical holes in natural convection[J].Journal of Shanghai University of Electric Power,2019,35(6):.