Modelica-based ship secondary circuit system heat exchanger dynamic simulation model development method

Abstract

The invention belongs to the field of ship software development, and particularly relates to a Modelica-based ship secondary circuit system heat exchanger dynamic simulation model development method. The method comprises a parameter initialization module and a calculation module; the parameter initialization module is used for setting boundary conditions, structures and initial parameters; the calculation module is a core calculation module of a model program and is composed of a main condensation area calculation module, an intermediate heat exchanger calculation module, an internal heat exchanger calculation module, a hot well calculation module, an air cooling area calculation module and a bypass emission calculation module. Aiming at a condenser and a heat exchanger of a traditional structural form of a ship secondary circuit system and an integrated condenser of a multi-medium sleeve type structure, a universal dynamic simulation model of a multi-structure and multi-pressure-node heat exchanger is established by combining the characteristic of high integration of the structure and the function of the condenser and the heat exchanger; and the real-time performance required by simulation research and the high precision of a simulation result are considered.

Description

technical field [0001] The invention belongs to the field of ship software development, in particular to a method for developing a dynamic simulation model of a ship secondary circuit system heat exchanger based on Modelica. Background technique [0002] At present, integrated and modular design is an inevitable requirement for ship nuclear power plant to achieve high-power power under the condition of limited tank capacity. Heat exchange equipment is an important part of ship power system, occupying a large amount of ship space and weight. Heaters mainly include condensers, feed water heaters and other equipment in various forms of heat exchange such as water-water and oil-water heat exchangers. At present, the mature general-purpose models of heat exchangers at home and abroad can only use the lumped parameter method to conduct dynamic simulation analysis of shell-and-tube and surface heat exchangers with simple structures, while most simulation models developed for heat e...

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Problems solved by technology

The composition of the ship's secondary loop system is complex, the coupling correlation between subsystems and equipment is strong, and there are many limiting factors for the convergence of dynamic response. However, the equipment models developed by different methods in the simulation of the secondary loop system have time step coordination and data interaction problems, which are not conducive to system simulation. real-time and joint debugging

Generally, it is difficult to realize the graphical modeling of self-developed simulation models. The input and output of the model are carried out in the form of text, which is not conducive to the use of users and the inspection of calculation results.

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