摘要
对于超临界CO_(2)布雷顿循环中的印刷电路板换热器,其复杂结构与工作介质的特殊物理性质将导致集总参数方法出现较大的计算误差。为提升印刷电路板换热器的换热参数的计算精度,本文基于Modelica语言,采取分节点建模方法,开发了印刷电路板换热器的热工水力特性计算程序,对其稳态运行时的换热参数进行了分析。结果表明:印刷电路板换热器的通道内超临界CO_(2)的对流换热系数沿流动方向发生显著变化。与设计值相比,分节点计算程序的最大相对误差小于3%,计算精度相比于集总参数方法显著提升,因此有必要采取分节点计算方法以提高计算精度。研究结果可为超临界CO_(2)布雷顿循环系统中印刷电路板换热器的设计和仿真提供参考。
For the printed circuit heat exchanger(PCHE)in supercritical CO_(2) Brayton cycle,its complex structure and special physical properties of the working medium will lead to large calculation errors in the lumped parameter method.To improve calculation accuracy,the PCHE thermal-hydraulic calculation program is developed on the ba-sis of the Modelica language.The parameters of PCHE during steady-state operation are analyzed using the subnode method.The results show that the convective heat transfer coefficient of sCO_(2) in the PCHE channel substantially changes along the flow direction.Compared with the design value,the maximum relative error of the subnode cal-culation program is less than 3%.The calculation accuracy is also greatly improved compared with that of the lumped parameter method.Therefore,the subnode calculation method should be adopted to improve the calculation accuracy.The results can provide a reference for the design and simulation of PCHE in sCO_(2) Brayton cycle sys-tems.
作者
明杨
金旸
杨雯
赵富龙
谭思超
田瑞峰
MING Yang;JIN Yang;YANG Wen;ZHAO Fulong;TAN Sichao;TIAN Ruifeng(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;China Shipbuilding Development and Design Center,Wuhan 430000,China;Nuclear Power Institute of China,Chengdu 610041,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2024年第4期819-824,共6页
Journal of Harbin Engineering University
基金
中国科协项目(2021QNRC001).
关键词
超临界二氧化碳
超临界流体
布雷顿循环
印刷电路板
逆流式
换热器
分节点法
换热特性
supercritical carbon dioxide
supercritical flow
Brayton cycle
printed circuit
counterflow
heat ex-changer
sub-node calculation method
heat exchange characteristics
