Method for optimizing and adjusting parameters of thermodynamic system

Abstract

The invention discloses a method for optimizing and adjusting parameters of a thermodynamic system. The method is characterized by comprising: deriving, by using a steady state finite time thermodynamic analysis method, dimensional and dimensionless relationships among the output power, efficiency, heat absorption rate and heat release rate of the thermodynamic system, the equivalent heat absorption temperature and equivalent heat release temperature of a working medium, the high-temperature heat source temperature, low-temperature heat source temperature, and the ratio [kappa] of total heat transfer coefficients of low-temperature and high-temperature heat exchangers; and by using two relational graphs of the dimensionless output power and efficiency and of the parameters such as the output power and [kappa], illustrating that the optimum efficiency is determined by an equal weight method, the maximum output power when [kappa]=1 is obtained at the same time and the corresponding [kappa] value is searched by using a graphing method. The method of the invention makes the efficiency, output power and [kappa] value of the thermodynamic system harmoniously optimized, and has academic innovation and important application values.

Description

Technical field [0001] The invention relates to the field of energy and power mechanical engineering, and particularly provides a thermal system parameter optimization design method. Background technique [0002] The thermal system is a device that absorbs the heat of the high temperature heat source and outputs the power and discharges the waste heat to the low temperature heat source. The thermal device is also called the heat engine, which mainly includes the high temperature heat exchanger, the expander, the low temperature heat exchanger, the liquid circulating pump, and the internal filling of the thermal device There is a working fluid, the working fluid is thermally circulated in the heat engine. The high-pressure liquid working fluid evaporates in the high-temperature heat exchanger, absorbs heat from the heat source, and becomes high-pressure steam. The expander outputs work to the outside world to drive the generator to generate electricity. The working medium gas is c...

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Problems solved by technology

[0019] In order to overcome the fact that the existing thermodynamic theory based on the assumption of reversible process and equilibrium state cannot describe the thermodynamic problems of the actual thermodynamic system in the heat transfer process, and the existing finite-time thermodynamic analysis method cannot provide the heat transfer rate and efficiency of the actual thermodynamic system clearly. Insufficient function relationship, and to supplement the content of the invention patent of "A Method for Optimizing the Thermal Parameters of a Thermal System" that cannot be filed in the same case, this application proposes a method for optimizing and adjusting the parameters of the thermal system. Internally reversible heat engine model, solve and use dimensionless to express the power, efficiency and high and low temperature heat sources of the thermal system, the high temperature and low temperature of the circulating working fluid, and the analysis method of the relationship between the heat transfer coefficient of the heat exchanger, through the dimensionless thermodynamic parameter relationship diagram, seek When the thermal system obtains high efficiency and high output power at the same time, determine the matching value of the heat transfer coefficient of the high temperature and low temperature heat exchangers

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