Optimization study of radial finned latent heat storage system employing novel circumferential perforations

Abstract

Radial fins enhance the performance of Latent Heat Storage (LHS) systems. However, they limit the convection within the Phase Change Material (PCM). This limitation is addressed in this study by employing perforations to maximize the benefit of radial fins. This work proposes a novel ‘circumferential perforations’ on radial finned LHS system to enhance convection. A numerical approach is adopted to optimize the perforated fin geometry with ease. The numerical solution uses the enthalpy porosity technique to model the phase change and is validated experimentally. An optimization study is performed to determine the preferred location, thickness, overall geometry of perforation, HTF charging mode, and shell geometry. The circumferential perforations are found to clearly impact the melting by enhancing the convection heat transfer within PCM. The utilization of bottom charging has been observed to augment the usefulness of perforations significantly. Compared to the unperforated radial fins case, the optimized perforated fin heat exchanger has melted the 99 % of PCM in less than 50 minutes. This result is far higher compared with the existing perforated fin studies.