A method and system for obtaining a compression factor

Abstract

The invention discloses a method and system for obtaining a compression factor. Firstly, a working fluid to be measured with a preset fixed volume V is obtained, and the corresponding working fluid to be measured at (Ti, pi) state points at different preset fixed masses is Measure the experimental compression factor Zi of the working medium, that is, obtain the discrete compression factor through the experimental method, then construct the training sample set according to the discrete compression factor, and finally construct the compression factor prediction model according to the training sample set and LS-SVM method, the compression factor prediction model That is, the relational expression between the state point (T, p) to be solved and the corresponding compression factor Z to be solved. The invention first obtains the discrete compression factor through an experimental method, then obtains a compression factor prediction model through model prediction on the discrete compression factor, and can obtain the continuous compression factor according to the compression factor prediction model. Therefore, the present invention can complete the acquisition of the compressibility factor of any working medium at different temperatures and pressures.

Description

technical field [0001] The present invention relates to the technical field of compression factors, and more specifically, to a method and system for obtaining compression factors. Background technique [0002] Compressibility factor (compressibility factor, abbreviated as Z) is one of the important thermophysical parameters of working fluid, which is often used to calculate other physical parameters. Since the compressibility factor Z changes with the change of temperature T and pressure p, therefore, in the process of During engineering calculation, it is necessary to obtain the compression factor Z under different (T,p) states. [0003] Using the corresponding state law to solve the compression factor is a commonly used method at present. The method is specifically: according to the temperature T of the working fluid to be measured, the pressure p and the corresponding critical temperature T c and critical pressure p c , get the contrast temperature T r and contrast p...

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Problems solved by technology

At the same time, for the critical pressure p of the working fluid to be tested that needs to be known in advance c and critical temperature T c , in actual operation, for new working fluid or mixed working fluid, the critical pressure p c and critical temperature T c is often missing

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