Preparation method and system of supercritical pressure fluid heat exchanger

Abstract

The invention relates to a preparation method and system of a supercritical pressure fluid heat exchanger. The preparation method comprises the steps of: obtaining the boundary conditions of a supercritical pressure fluid heat exchanger; adjusting a heat exchanger preliminary frame based on the boundary conditions; dividing each fluid channel along the fluid flowing direction based on the heat exchanger preliminary frame, and establishing a heat balance control model for each divided fluid channel; based on the heat balance control model, combining a Gaussian regression process and a collaborative Kriging method to construct a machine heat transfer model; determining on-way thermal parameters of flowing heat transfer of a working medium in each fluid channel according to the machine heat transfer model; determining the area of the heat exchanger according to the on-way thermal parameters; judging whether a heat exchange area reaches a heat exchange area standard or not, and if yes, preparing a supercritical pressure fluid heat exchanger according to the heat exchanger primary frame; and if not, readjusting the heat exchanger primary frame until the heat exchange area reaches the heat exchange area standard. The heat exchanger performance of the supercritical pressure fluid heat exchanger can be improved.

Description

technical field [0001] The invention relates to the field of preparation of supercritical pressure fluid heat exchangers, in particular to a preparation method and system of supercritical pressure fluid heat exchangers. Background technique [0002] Supercritical CO 2 The Brayton cycle is based on supercritical pressure CO 2 The Brayton cycle, which is the working medium, has the advantages of low compression power consumption, high overall efficiency and compact structure compared with the traditional cycle. As its main working medium, the supercritical pressure CO 2 It has the characteristics of high density, low viscosity, strong diffusivity and permeability, so supercritical CO 2 The Brayton cycle has broad prospects for development in the fields of aero-engines, fourth-generation nuclear reactors, and solar thermal power generation. Due to the CO at the inlet of the compressor in the cycle 2 The state is close to the critical state, and its remarkable variable physi...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a supercritical pressure fluid heat exchanger preparation method and system to solve the existing supercritical pressure fluid heat exchanger preparation process , it is difficult to construct a correlation to obtain a large number of high-precision data points, which leads to the low accuracy of the predicted structural parameters of the heat exchanger, which in turn leads to the problem of poor performance of the prepared heat exchanger

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