摘要
印刷电路板式换热器(PCHE)具有耐高温高压和结构紧凑的特点,因此常被用于超临界二氧化碳(S-CO2)布雷顿循环中。本文采用分段设计方法对PCHE建立了数学模型,与实验结果对比显示,热负荷、冷负荷、冷流体进口温度、热端换热面积、热端流量的误差分别为2.700%、0.330%、0.634%、0.683%、2.219%,证明了数值模型的正确性。对不同水力直径、壁厚及热端进口温度下的PCHE换热性能及阻力特性进行了对比分析,结果表明:水力直径与总传热系数和压降成反比,冷端压降大于热端;壁厚与总传热系数成反比,但压降对壁厚变化不敏感;热端进口温度越高,总传热系数和压降越小。研究结果可为PCHE的几何设计和热力学性能的研究提供一定参考。
Printed circuit heat exchanger(PCHE)has the characteristics of high temperature and high pressure resistance as well as compact structure,so it is widely used in supercritical carbon dioxide(S-CO2)Brayton cycle.In this paper,the mathematical model of the PCHE is established by segmental design method.Comparison with the experimental results shows that,the errors of heat load,cooling load,inlet temperature of cold fluid,hot side heat transfer area and hot side flow rate are 2.700%,0.330%,0.634%,0.683%and 2.219%,respectively,which proves the validity of the numerical model.The heat transfer performance and resistance characteristics at different hydraulic diameters,wall thicknesses and inlet temperatures of hot side are compared and analyzed.The results show that,the hydraulic diameter is inversely proportional to the total heat transfer coefficient and pressure drop,and the pressure drop at the cold side is larger than that at the hot side.The wall thickness is inversely proportional to the total heat transfer coefficient,but the pressure drop is not sensitive to the change of wall thickness.The higher the inlet temperature of the hot side,the smaller the total heat transfer coefficient and pressure drop.The research can provide some references for geometric design and thermodynamic properties of PCHE.
作者
徐婷婷
赵红霞
韩吉田
赖艳华
XU Tingting;ZHAO Hongxia;HAN Jitian;LAI Yanhua(School of Energy and Power Engineering,Shandong University,Jinan 250061,China)
出处
《热力发电》
CAS
北大核心
2020年第12期28-35,共8页
Thermal Power Generation
基金
国家自然科学基金项目(51776110)。
关键词
印刷电路板式换热器
换热性能
Z型流道
超临界二氧化碳
布雷顿循环
分段设计
printed circuit heat exchanger
heat exchange performance
Z-type channel
supercritical carbon dioxide
Brayton cycle
segmental design
