CIESC Journal ›› 2023, Vol. 74 ›› Issue (S1): 183-190.DOI: 10.11949/0438-1157.20230171

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Performance analysis of printed circuit heat exchanger for supercritical carbon dioxide

Yifei ZHANG(), Fangchen LIU, Shuangxing ZHANG, Wenjing DU()   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2023-02-27 Revised:2023-03-27 Online:2023-09-27 Published:2023-06-05
  • Contact: Wenjing DU


张义飞(), 刘舫辰, 张双星, 杜文静()   

  1. 山东大学能源与动力工程学院,山东 济南 250061


Printed circuit heat exchanger (PCHE), as a new micro-channel heat exchanger with high efficiency and compactness, has very high potential to be applied to supercritical CO2 Brayton cycle. Based on the principle of heat transfer enhancement, the straight channel of PCHE is improved and the PCHE with variable diameter is proposed. This kind of channel can adapt to the change of fluid physical properties and obtain better comprehensive performance. The thermal-hydraulic performance of supercritical CO2 in PCHE channel with variable diameter is analyzed by numerical simulation. The results show that with the decrease of width, convective heat transfer coefficient increases, and the more it increases than corresponding PCHE with constant diameter. The structure of variable diameter has little influence on the pressure drop of cold fluid, and the application of structure of variable diameter to PCHE with larger width can reduce the increase of CO2 pressure drop. The structure of variable diameter will improve the comprehensive performance more obviously for PCHE with smaller width. For PCHE whose width is 1.6 mm, the comprehensive performance of PCHE with variable diameter is 1.81 times that of PCHE with constant diameter at 1.2 g/s. Convective heat transfer coefficient increases with the augment of changing ratio of width. When the changing ratio of width changes from 2 mm/m to 2.75 mm/m, the peak value of convective heat transfer coefficient increases by 2.9%. Arranging the variable diameter section at the back end of PCHE has better heat transfer characteristics, and its peak of convective heat transfer coefficient is increased by 23% compared with other forms. Analysis of thermal-hydraulic performance of PCHE with different structures can provide reference for theoretical research of supercritical CO2 cooling and typical engineering application of PCHE.

Key words: supercritical carbon dioxide, printed circuit heat exchanger, precooler, numerical simulation, flow, heat transfer



关键词: 超临界二氧化碳, 印刷电路板式换热器, 预冷器, 数值模拟, 流动, 传热

CLC Number: