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Optimal design of the first stage of the platefin heat exchanger for the EAST cryogenic system

Plasma Science and Technology 2018年第3期20卷 163-171页

作者：蒋庆峰朱志刚张启勇庄明陆小飞 Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hetel 230026 People s Republic of China

The size of the heat exchanger is an important factor determining the dimensions of the cold box in helium cryogenic systems. In this paper, a counter-flow multi-stream plate-fin heat exchanger is optimized by means of a spatial interpolation method coupled with a hybrid genetic algorithm.Compared with empirical correlations, this spatial interpolation algorithm based on a kriging model can be adopted to more precisely predict the Colburn heat transfer factors and Fanning friction factors of offset-strip fins. Moreover, strict computational fluid dynamics simulations can be carried out to predict the heat transfer and friction performance in the absence of reliable experimental data. Within the constraints of heat exchange requirements, maximum allowable pressure drop, existing manufacturing techniques and structural strength, a mathematical model of an optimized design with discrete and continuous variables based on a hybrid genetic algorithm is established in order to minimize the volume. The results show that for the first-stage heat exchanger in the EAST refrigerator, the structural size could be decreased from the original2.200？×？0.600？×？0.627（m^3） to the optimized 1.854？×？0.420？×？0.340（m3）, with a large reduction in volume. The current work demonstrates that the proposed method could be a useful tool to achieve optimization in an actual engineering project during the practical design process.

关键词： EAST cryogenic system plate-fin heat exchanger optimization genetic algorithm

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THE RESEARCH ON plate-fin heat exchanger AND HOW TO SEPARATE ITS CONVECTION heat-TRANSFER COEFFICIENT

THE RESEARCH ON PLATE-FIN HEAT EXCHANGER AND HOW TO SEPARATE...

引用

International Symposium of Air Conditioning in High Rise Buildings’2000

作者： ZHANG XIAOSONG WANG LI and LI SHUHONGDepartment of Power Engineering Southeast University 210096 Nanjing China

＜正＞ plate-fin heat exchanger has a high compact index. It has been extensively used in cryogenic region and has shown a good applying prospect in other respects along with the developing in depth of research. How to separate heat-transfer coefficient from the heat-transfer coefficient, which is obtained by experiment, is very important for extending its application. This paper makes a beneficial research in this respect.

关键词： plate-fin heat exchanger Separation of convective heat-transfer coefficient Steady state method Experimental research

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