摘要
通过实验和数值计算对套管式气体冷却器在不同出水温度时CO2侧物性参数分布进行了分析和比较,并利用仿真计算在特定出水温度下,套管式气体冷却器不同换热面积对其传热特性的影响。分析结果表明:在不同出水温度下CO2的物性参数分布有明显区别,且其平均值随着出水温度的升高而降低,尤其是平均定压比热容;对数传热温差随着换热面积的增加而减小;总传热系数在换热面积为1.05A时达到最大值,当换热面积继续增大时总传热系数减小;在管长增加20%时,换热量提升4.6%;水侧对流换热随着换热面积的增大而增大;CO2侧对流换热系数在流动过程中存在极值,并且其极值随着换热面积的增大而减小且位置向入口处移动。
The experiment and numerical calculation were used to analyze and compare the CO2 side physical property parameters of the double pipe gas cooler at different outlet temperatures,and the influence of different heat exchange areas on the heat transfer process of the double pipe gas cooler at a specific outlet temperature was calculated by simulation.The results show that the distribution of physical properties of CO2 is significantly different at different effluent temperatures,and the average value decreases with the increase of effluent temperature,especially the average Cp;the logarithmic temperature difference decreases with the increase of heat transfer area;the total heat transfer coefficient reaches the maximum when the heat transfer area is 1.05 A,and it will decrease when the heat transfer area continues to increase.When the length of the heat exchange tube is increased by 20%,the heating capacity is increased by 4.6%;the convective heat transfer on the water side increases with the increase of the heat exchange area;the convective heat transfer coefficient of the CO2 side has an extreme value in the flow process.Its extreme value decreases and its position moves toward the inlet as the heat exchange area increases.
作者
潘浩
江斌
罗威
熊丹
汤晓亮
Pan Hao;Jiang Bin;Luo Wei;Xiong Dan;Tang Xiaoliang(Hefei University of Technology,Hefei 230009,China;Jiangsu Sujing Purification Group CO.,Ltd.,Suzhou 215122,China)
出处
《低温与超导》
CAS
北大核心
2019年第9期85-89,98,共6页
Cryogenics and Superconductivity
关键词
套管式气体冷却器
超临界CO2
传热过程
物性参数
Double pipe gas cooler
Supercritical CO2
Heat transfer
Physical property parameters
