Zigzag PCHE内熔盐/S-CO2流动与换热特性研究
Heat Transfer Performance of zigzag PCHE With Molten Salt and Supercritical CO2 in CSP System
姚业成 1张媛媛 2纪峰 1王维龙 1陆建峰 1丁静1
作者信息
- 1. 中山大学材料科学与工程学院,广州 510006
- 2. 中国科学院广州能源研究所,广州 510640
- 折叠
摘要
印刷电路热交换器(PCHE)是一种高效紧凑型换热器,是高温光热发电技术的理想换热部件.本文构建了 Zigzag PCHE数理模型,研究了熔盐/超临界CO2(S-CO2)在流道内流动和换热特性.采用SST k-ω湍流模型,分析了流道结构和流体流速对熔盐与S-CO2对流换热特性的影响.结果表明,在流道结构的作用下,流动和换热特性呈周期性变化.传热阻力主要在气体侧,总换热系数随着S-CO2入口流量的增大而提高,压降也随之增大.并基于Zigzag型结构进行了通道优化,压降降低了约50％,提高了换热器性能.
Abstract
The printed circuit heat exchanger(PCHE)is a highly efficient and compact heat ex-changer,and serves as an ideal heat transfer component in high-temperature solar thermal power generation technology.In this study,a mathematical model of Zigzag PCHE is constructed to in-vestigate the flow and heat transfer characteristics of molten salt and supercritical CO2(S-CO2).The SST k-ω turbulence model is utilized to study convective heat transfer characteristics between molten salt and S-CO2.Results show that temperature and heat transfer coefficient periodically vary with periodical structure.The heat transfer resistance mainly occurs on the S-CO2 side and the overall heat transfer coefficient increases with the inlet flow rate of S-CO2.Additionally,Sin structure is performed to improve the heat transfer performance based on the Zigzag PCHE.
关键词
熔盐/超临界二氧化碳流体/Zigzag/PCHE/对流换热特性Key words
molten salt/supercritical CO2/zigzag PCHE/convective heat transfer characteristics引用本文复制引用
基金项目
国家自然科学基金资助项目(2018YFB1501003)
国家自然科学基金资助项目(U22A20213)
国家自然科学基金资助项目(52036011)
出版年
2024
NETL
NSTL
万方数据