Plate-fin heat exchanger core structure optimization method based on dynamic pixel granularity

Abstract

The invention discloses a plate-fin heat exchanger core structure optimization method based on dynamic pixel granularity. The method comprises the following steps: establishing a plate-fin heat exchanger core structure optimization design model according to a plate-fin heat exchanger core runner structure, providing dynamically-updated pixel granularity, enlarging the population search range and keeping the population diversity; and providing a pixel distance calculation model of non-head and tail particles and head and tail particles, calculating the cross and mutation operation probabilities in a self-adaption manner according to the pixel distances of the particles, and respectively adopting random cross and Gaussian mutation, so as to enhance the global population search capability, improve the local population search efficiency, prevent the algorithm from getting into local optimum and realize the purposes of wide coverage and uniform distribution of Pareto optimal solutions. According to the method, the heat exchanger core structure design efficiency can be improved, and relatively reasonable design parameters are provided. The plate-fin heat exchanger optimally designed by the method has the obvious characteristics of uniform passage load, small secondary heat transfer temperature difference, small flow resistance and high heat exchange efficiency.

Description

technical field [0001] The core structure optimization method of the plate-fin heat exchanger of the present invention particularly relates to a core structure optimization method of the plate-fin heat exchanger based on dynamic pixel granularity. Background technique [0002] Compared with traditional heat exchangers such as tube heat exchangers, plate-fin heat exchangers have the characteristics of high heat transfer efficiency, good temperature difference control, compact structure, high cost performance, wide adaptability, and high reliability. They are manufactured by brazing. Improve the compressive strength of heat exchange, can be used for multi-fluid heat exchange, heat exchange between various media, and has wide applications in the fields of air separation equipment, aerospace, petrochemical, atomic energy and national defense industries. The plate-fin heat exchanger uses fins as the heat exchange unit, and its heat transfer coefficient and heat transfer area are ...

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Problems solved by technology

The existing heat exchanger structure optimization design method has the disadvantages of strong local optimization ability but poor global search ability, prone to premature convergence, and the design accuracy is difficult to meet the demand

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