Abstract
Radiative cooling is an emerging potential alternative to conventional cooling systems. It has the potential to attain sub-ambient temperatures in water-cooling systems. The performance of radiative water-cooling systems depends on numerous factors, including atmospheric conditions, characteristics of the coating, and geometry of the system. A spectrally selective surface coating was used in this study to cool the fluid. Along with the coating, the fluid flow path design is also one of the crucial factors that will affect the cooling performance of the system. Therefore, this study investigates the effect of different flow paths and ambient conditions on radiative water cooling using COMSOL Multiphysics. In this study, different flow paths such as zig-zag, spiral, square spiral, and square spiral with center inlet were explored and their cooling performances were compared. The results show that the spiral flow path got a cooling power of 70 to 90 W/m2 and reached the lowest possible temperature of 286 K, and the average temperature at the outlet was 294 K when the ambient temperature was 300 K. Further, the velocity distribution and pressure drop were analyzed. These results provide important insights into enhancing flow path designs to enhance the performance of radiative water-cooling systems.
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