接触热阻对双H型鳍片管传热系数的影响

doi:10.11930/j.issn.1004-9649.2017.02.057.07

中国电力 ›› 2017, Vol. 50 ›› Issue (2): 57-63.DOI: 10.11930/j.issn.1004-9649.2017.02.057.07

接触热阻对双H型鳍片管传热系数的影响

葛铭^{1, 2}, 赵利杰³, 舒少辛³, 张守玉¹, 吕俊复²

1. 上海理工大学能源与动力工程学院,上海 200093;
2. 清华大学热能工程系,北京 100084;
3. 江苏海德节能科技有限公司,江苏无锡 214215

收稿日期:2016-08-27 出版日期:2017-02-20 发布日期:2017-02-22
作者简介:葛铭（1991—）,男,江苏南通人,硕士研究生,从事低温省煤器的换热与磨损研究。E-mail:gm0217@126.com
基金资助:
国家重点基础研究发展计划（973计划）资助项目（2012CB214904）

Impact of Thermal Contact Resistance on Heat Transfer Coefficient of Double H-Type Finned Tubes

GE Ming^{1, 2}, ZHAO Lijie³, SHU Shaoxin³, ZHANG Shouyu¹, LV Junfu²

1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;
3. Hi-Tech (Jiangsu) Research & Science Co., Ltd., Wuxi 214215, China

Received:2016-08-27 Online:2017-02-20 Published:2017-02-22
Supported by:
This work is supported by the Major State Basic Research Development Program of China (973 Program) (No. 2012CB214904).

摘要/Abstract

摘要： 对2种常用的双H型鳍片管换热管束（ND钢和316L不锈钢）进行了实验研究,得到2种材料的实际传热系数。同时,将接触热阻考虑到鳍片效率中,推导得到了双H型鳍片管传热系数的计算模型,并通过实验验证了模型的准确性。实验发现,在焊接工艺和结构尺寸等因素相同的条件下,ND钢试样的传热系数远大于316L试样。根据实验值与计算值的差值,可以得到各试样的接触热阻值。对比2组试样的接触热阻值发现,ND钢试样的接触热阻远小于316L不锈钢试样。对于特定结构的双H型鳍片管,接触热阻导致316L试样传热系数下降了7 W·（m²·K）^-1,而对ND 钢试样传热系数的影响却可以忽略不计。同时,对计算模型分析可知,当单位接触热阻小于0.001 m²·K/W量级时,其对传热系数的影响基本可以忽略不计,验证了实验结果。计算模型可以预测特定结构鳍片管的接触热阻,从而判断接触热阻对传热系数的影响,为工业上选取合适的低温省煤器换热管束材料和焊接技术提供参考。

关键词: 低温省煤器, 双H型鳍片管, 传热系数, 接触热阻, 实验研究

Abstract: The actual heat transfer coefficients of two commonly-used double H-type finned tubes(ND steel and 316L stainless steel) are obtained through experimental study. A computational model of the overall heat transfer coefficient with the thermal contact resistance being incorporated into the fin efficiency is proposed, and the accuracy of the proposed model is validated through the experiments. The experiments show that the overall heat transfer coefficient of Sample ND is much bigger than that of Sample 316L under the condition of the same manufacturing technology and the same structural dimensions. From the difference between the experimental and the calculated data, the thermal contact resistance of each sample are obtained. By comparing the two samples, it is found that the thermal contact resistance of Sample ND is far less than that of Sample 316L. In addition, for the special double H-type fins, the thermal contact resistance decreases the coefficient of Sample 316L by 7 W/(m²·K) while its impact on Sample ND can be ignored. Meanwhile, the analysis of the computational model shows that when the unit thermal contact resistance is less than 0.001 m²·K·W^-1, its impact on the coefficient is too little to be counted, which proves the results of the experiments. The computational model can be used to predict the thermal contact resistance of finned tubes with special structures so as to determine the influence of the thermal contact resistance on the overall heat transfer coefficient. The study result can provide a reference on the selection of the materials and welding technologies for low-temperature economizer tube bundles in industrial applications.

Key words: low-temperature economizer, double H-type finned tube, overall heat transfer coefficient, thermal contact resistance, experimental study

中图分类号:

TM621

葛铭, 赵利杰, 舒少辛, 张守玉, 吕俊复. 接触热阻对双H型鳍片管传热系数的影响[J]. 中国电力, 2017, 50(2): 57-63.

GE Ming, ZHAO Lijie, SHU Shaoxin, ZHANG Shouyu, LV Junfu. Impact of Thermal Contact Resistance on Heat Transfer Coefficient of Double H-Type Finned Tubes[J]. Electric Power, 2017, 50(2): 57-63.

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接触热阻对双H型鳍片管传热系数的影响

Impact of Thermal Contact Resistance on Heat Transfer Coefficient of Double H-Type Finned Tubes

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