Design and Analysis of a High-Temperature Heat Exchanger for Compressed CO

Compressed Carbon Dioxide Energy Storage (CCES) systems have gained attention due to their high efficiency and compact design. The high-temperature heat exchanger is a key component that directly affects system efficiency and operational reliability. This study employs an iterative design methodology for a shell-and-tube high-temperature heat exchanger in CCES system, based on variable property calculations. The approach follows standard design guidelines while considering temperature-dependent thermophysical properties and system pressure drop constraints. A U-tube bundle is employed to mitigate thermal stresses induced by large temperature differences. Geometric parameters are optimized through a systematic iterative algorithm to meet both thermal and hydraulic performance requirements. Results show that the design meets the target heat transfer load while controlling pressure drops on both the tube and shell sides. Sensitivity analysis indicates that reducing baffle spacing from 0.3 m to 0.2 m increases shell-side pressure drop by roughly three times, with only a 3% improvement in overall heat transfer coefficient, while baffle cut ratio has a relatively minor impact. This methodology provides a practical framework for designing high-temperature heat exchangers in CCES systems.