Optimization of fin arrangement and channel configuration in an airfoil fin PCHE for supercritical CO_2 cycle

摘要

As a new type of discontinuous fin, airfoil fin (AFF) can bring a better thermal-hydraulic performance than Zigzag fin and S-shaped fin when applied to PCHE using supercritical CO_2 as a working fluid. In this study, the effects of AFF arrangements on heat transfer and flow resistance are investigated. The results show that a sparser staggered arrangement of fins can lead to a better thermal-hydraulic performance in an AFF PCHE and the flow resistance plays a major role in determining the overall performance. It concludes that reducing the flow resistance needs to be considered first in the optimal design of a PCHE using supercritical CO_2 as working fluid. Furthermore, a new fin structure (modified AFF) is proposed for flow resistance reduction and is proved to be better than the AFF.