Improving the heat transfer efficiency between liquid lead-bismuth eutectic(LBE) and supercritical carbon dioxide(S-CO_2) is of great significance for advancing the development of advanced nuclear energy systems. The heat transfer performance of printed circuit heat exchangers(PCHE) with different channel structures(straight shaped

wing-shaped

S-shaped and Z-shaped) is investigated through numerical simulation. The results show that the thermal resistance on cold side of the heat exchanger is significantly higher than that on the hot side

with the average heat transfer coefficient of the hot side in straight-channel PCHE being 26.2 times that of the cold side. Under the condition of a fixed hot-side channel structure

the effects of different cold-side channel structures on PCHE heat transfer performance are explored. The results indicate that

compared with straight channels

the heat transfer of Z-shaped

S-shaped and wing-shaped channels increases by 23.3%

22.2%

and 10.6%

respectively

while the specific pumping power improves by 1.48 times

1.68 times

and 1.44 times

respectively. In addition

the dynamic performance of different PCHE designs when the cold-side flow rate increases by 20% is compared

revealing that the straight-channel PCHE has the shortest rebalancing time. The pressure drop loss is more significant than the improvement in heat transfer. These findings provide theoretical guidance for optimizing the design of LBE/S-CO_2 heat exchangers and contribute to enhancing the thermal efficiency of next-generation nuclear energy systems.