Thermal Evaluation of 3D ‐Printed Triply Periodic Minimal Surface Compact Heat Exchanger Using Hexagonal Boron Nitride Photopolymeric Composite

ABSTRACT This study reports the first investigation of the thermal behavior of compact heat exchangers (HXs) with complex geometries 3D‐printed using a photopolymeric composite as the base material. HXs with Triply Periodic Minimal Surface (TPMS) geometry were fabricated using a photopolymeric composite doped with 5 wt% hexagonal boron nitride ( h ‐BN). Mechanical characterization revealed reductions in ultimate tensile strength (41.5%) and ductility (20.5%) compared to the neat resin, whereas hardness remained comparable. Thermal analysis showed an 11.03% increase in thermal conductivity for the composite. Performance testing of the HXs demonstrated a 28.74% improvement in overall thermal conductance and a 26.25% enhancement in heat transfer compared to neat resin heat exchangers. These findings highlight the potential of h ‐BN‐doped photopolymeric composites for fabricating complex structures and advancing thermal management applications.