Optimization design method of multiple flow fluid channel arrangement for plate-fin heat exchanger
A technology of plate-fin heat exchangers and fluid channels, which is applied in the direction of instruments, calculations, and special data processing applications, etc., and can solve problems such as the optimal location of bad accumulation loads and the inability to find them well
Inactive Publication Date: 2013-10-16
XI AN JIAOTONG UNIV
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However, the current design method is not very good at finding the optimal location of this undesirable accumulation load
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[0025] The present invention will be described in detail below in conjunction with the embodiments.
[0026] This is a multi-channel counter-flow plate-fin heat exchanger in which three fluids participate in heat exchange, n h = 2, n c =1, thermal fluid h i (i=1, 2) are air and carbon dioxide gas respectively, cold fluid c j (j=1) is nitrogen, known hot air h 1 Flowing through the heat exchanger from top to bottom, its mass flow Inlet temperature output temperature and channel layers respectively °C, hot carbon dioxide gas h 2 Also flows through the heat exchanger from top to bottom, its mass flow Inlet temperature output temperature and channel layers respectively while cold nitrogen c 1 then flows through the heat exchanger from bottom to top, and its mass flow Inlet temperature output temperature and channel layers respectively The fin type is 65PZ1402 for all three fluids.
[0027] An optimal design method for fluid chan...
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Disclosed is an optimization design method of multiple flow fluid channel arrangement for a plate-fin heat exchanger, which includes calculating single channel thermal loads of a thermal fluid hi and a cold fluid cj of the heat exchanger, expressing the channel arrangement to be optimized as binary string chromosome x= (x1, x2, ..., xl), constructing a fitted value function or a target function F(x) of the channel arrangement chromosome x, constructing constraint conditions, selecting control parameters in the genetic optimization process, obtaining finally optimized chromosome x by the aid of genetic optimization tools provided by Matlab, and listing corresponding fluids represented by all genes with a place value of 1 in the chromosome in sequence to obtain corresponding channel arrangement optimization results. According to the optimization design method, isolation arrangement and partial thermal balance design principles are synthesized, the channel position is weighed and quantized and poorly gathered load position in the channel arrangement is optimized for the first time, the method is achieved by utilizing the genetic optimization technique, and limitations of traditional design methods are overcome. The method has the advantages of being high in applicability, work efficiency and design quality.
Description
technical field [0001] The invention belongs to the technical field of plate-fin heat exchangers, and in particular relates to an optimal design method for the arrangement of fluid passages in a multi-flow plate-fin heat exchanger. technical background [0002] Plate-fin heat exchanger is a compact heat exchanger, which is widely used in various petrochemical and low-temperature gas liquefaction and separation industries due to its compact and light structure, high heat transfer efficiency, and easy arrangement of multiple fluids. However, in this multi-flow plate-fin heat exchanger, since there can be as many as a dozen kinds of hot and cold fluids participating in heat exchange at the same time, and there are usually hundreds of channels for distributing these fluids, the corresponding fluid channels The arrangement will also increase sharply, that is, the so-called "combination explosion" will occur, and it is difficult to use the exhaustive method to find the optimal cha...
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IPC IPC(8): G06F17/50G06N3/12
Inventor 厉彦忠赵敏
Owner XI AN JIAOTONG UNIV