A method and a device for constructing a physical model of a thermodynamic system

Abstract

The embodiment of the invention provides a method and a device for constructing a physical model of a thermodynamic system. The method comprises the following steps: thermal resistance, thermomotive force and / or an energy source are introduced to construct an equivalent energy flow model of each independent component of the thermodynamic system; the equivalent energy flow model of each independentcomponent is connected through the corresponding isothermal point, and the whole equivalent energy flow model of the thermodynamic system is constructed; Using Kirchhoff's law, the control equationsof energy flow model are established; the dynamic drag equilibrium equations of the working fluid flow process in the thermodynamic system are established; constraint equations between pressure and temperature of working fluid are established; the physical model of the thermodynamic system is constructed by combining the above equations. The method and the device for constructing the physical model of the thermodynamic system provided by the embodiment of the invention effectively combine the visual angle of the energy flow and the working fluid flow analysis, not only reducing the number of the control equations of the model, but also effectively solving the nonlinear coupling relationship among the system variables, and providing convenience for the subsequent model solution.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of system modeling, and in particular to a method and device for constructing a physical model of a thermodynamic system. Background technique [0002] As the foundation of modern industrial society, thermal system is widely used in many fields such as steel, chemical industry and power engineering. In order to effectively improve energy utilization efficiency, it is necessary to analyze and optimize its operating performance under variable working conditions, and solve The key to this problem lies in the construction of the physical model of the system. [0003] Since the thermal system in actual engineering generally has the characteristics of multi-component superposition, multi-process coupling and multi-parameter integration, the conventional modeling idea is to superimpose the control equations of all components to form a control equation set to describe the physical character...

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Problems solved by technology

[0005] In order to solve the problem of strong nonlinear coupling of multi-parameters in the construction process of the physical model of the thermodynamic system in the prior art, which makes the model difficult to solve, the embodiment of the present invention provides a method and device for constructing the physical model of the thermodynamic system

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