Fixed Investment Cost Relaxation Strategy for Heat Exchanger Network Synthesis

doi:10.19596/j.cnki.1001-246x.7902

Abstract

Abstract: In view of structural evolution difficulty caused by integer variables in heat exchanger network with fixed investment cost, a fixed investment cost relaxation strategy is proposed. It simplifies mathematical model of the problem by relaxing fixed investment cost. As heat exchanger is very small, fixed investment cost is almost zero. With increase of heat exchanger, fixed investment cost is gradually increased with a certain slope, and finally equals to the actual value. Controlling the change slope by the relaxation strength coefficient, on the basis of ensuring reliability of optimization results, heat exchangers with structural evolutionary obstacles are guided to generate or eliminate. The strategy is used to two cases in the literature, and effect of this strategy on generation or elimination of heat exchanger under different relaxation strength is investigated. Finally, a random walk algorithm with compulsive evolution based on fixed investment cost relaxation strategy is proposed. The algorithm is applied to a heat transfer network case. The result is superior to existing literature.

Key words: heat exchanger network, heuristic algorithm, structure evolution, relaxation strategy, random walking algorithm with compulsive evolution

CLC Number:

TK124

DENG Weidong, CUI Guomin, ZHU Yushuang. Fixed Investment Cost Relaxation Strategy for Heat Exchanger Network Synthesis[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(5): 610-620.

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