CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2019, Vol. 36 ›› Issue (2): 225-235.DOI: 10.19596/j.cnki.1001-246x.7838

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Global Optimization of Heat Exchanger Network Based on Structure Diversity Evaluation

BAO Zhongkai, CUI Guomin, XIAO Yuan, CHEN Jiaxing   

  1. Institute of New Energy Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2018-02-01 Revised:2018-05-11 Online:2019-03-25 Published:2019-03-25

Abstract: Individual gathering could cause decline of search ability as heuristic methods are applied to heat exchanger network (HEN) optimization. An evaluation methodology for HEN structure diversity was designed to measure degree of individual structure gathering, and guided algorithm improvement. Firstly, group division of population was performed, individuals of a certain scale with a common structure were classified as a group to get individual structure distribution. Then dispersal search strategy was proposed to give perturbation to heat exchangers randomly selected from common structure of individuals in each group except the best one, which aimed at dispersing individual structures in groups. Concentration search strategy was then proposed to enhance exploitation for excellent structure by making other individuals accept a common structure of the optimal group. Finally, two cases involving nine and fifteen streams proved that dispersal search strategy strengthened global search ability and concentration search strategy strengthened local search ability. It obtained results decreased by 7 008 $·a-1 and 17 973 $·a-1, respectively, compared to those obtained by original algorithm. They are superior to results in literature.

Key words: heat exchanger network, heuristic method, structure diversity, optimization

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