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General vapor pressure equation optimization method based on item library

An optimization method, a vapor pressure technology, applied in the field of algorithm optimization, which can solve the problems of not improving the global search ability, premature convergence and slow convergence speed.

Inactive Publication Date: 2021-04-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, the OPTIM algorithm is prone to premature convergence and slow convergence in the process of biological evolution.
Li Huiya of the Chinese Academy of Sciences accelerated the convergence speed of the algorithm by optimizing the regression analysis, but did not improve the global search ability

Method used

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  • General vapor pressure equation optimization method based on item library
  • General vapor pressure equation optimization method based on item library
  • General vapor pressure equation optimization method based on item library

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Embodiment Construction

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] The OPTIM-Ⅱ optimization algorithm is used to optimize the general vapor pressure equation based on the item library, and each equation is evaluated according to the predetermined objective function, and the optimal solution of the vapor pressure equation is found from generation to generation until the convergence condition or the preset up to the number of iterations;

[0036] Wherein, the OPTIM-II optimization algorithm is an improvement based on the existing OPTIM optimization algorithm, and its optimization steps include:

[0037] Initialization of equations: Randomly combine an equation with N items from the item library, repeat NS times, select the equation with the smallest objective function, repeat the ...

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Abstract

The invention relates to a general vapor pressure equation optimization method based on an item library, which enhances the ability of an original biological evolution optimization algorithm to jump out of a local optimal solution by changing variation rules. And new control parameters are adopted, so that the optimization result of the genetic algorithm is reserved to the greatest extent, and the algorithm search efficiency is improved. By adopting the improved algorithm provided by the invention, the vapor pressure equation of a new generation of environment-friendly alternative refrigerant R1234yf is optimized and calculated, and compared with a literature algorithm, the result shows that the new algorithm has obvious advantages in the aspects of global search capability, algorithm stability and calculation efficiency; a Wagner type vapor pressure equation of R1234yf based on an item library is obtained through optimization, it is found through analysis that the importance of all items in the item library has a coupling relation, and the items playing a leading role are the second item and the third item; the average absolute relative deviations of the fitting pressures of the five vapor pressure equations and the Wagner 2.5 and 5 type equations are 0.1027% and 0.1144% respectively, and the fitting precision of the vapor pressure equations is improved by 10.2% compared with the fitting precision of the Wagner 2.5 and 5 type equations.

Description

technical field [0001] The invention relates to the technical field of algorithm optimization, in particular to an item library-based general vapor pressure equation optimization method. Background technique [0002] Saturated vapor pressure is one of the important physical and chemical properties of substances. It is the basic data for system design and process parameter optimization in the fields of refrigeration and air conditioning, heat pumps, and chemical industry. It is also an important parameter for screening environmentally friendly alternative refrigerants. The vapor pressure equation plays an important role in the theoretical research and engineering application of thermodynamic properties such as fluid state equation and gas-liquid phase change law. Wagner obtained two widely used 4-parameter vapor pressure equations of Wagner2.5,5 type and Wagner3,6 type by optimizing and analyzing the general equation based on the item library. The general form of the vapor p...

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Application Information

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IPC IPC(8): G06F17/12G06F17/18G06N3/12
CPCG06F17/12G06F17/18G06N3/126Y02B30/70
Inventor 尹建国可晋军赵贯甲马素霞
Owner TAIYUAN UNIV OF TECH
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