Comparing trapezoidal and circular configurations to evaluate the impact of shell geometry on thermal energy storage performance

This research explores how the shape of the shell and inner tubes affects the performance of latent heat thermal energy storage (LHTES) systems. The study numerically investigated configurations with circular, rectangular, and trapezoidal geometries to address issues like low thermal conductivity in phase change materials. A key innovation was the optimization of both shell and inner tube trapezoidal shapes to enhance natural convection and heat distribution. Results showed that trapezoidal designs significantly reduced melting time compared to conventional circular designs. The Trapezoidal–Trapezoidal 03 configuration achieved the most substantial reduction in complete melting time. Analysis of enhancement ratios indicated that trapezoidal geometries improved heat transfer by promoting better heat distribution and reducing thermal dead zones. The study concluded that the optimal design depends on whether rapid melting or higher energy storage density is the priority, offering insights for solar thermal and waste heat recovery applications.

This study is important because it proposes design improvements for thermal energy storage systems, potentially leading to more efficient energy utilization in renewable energy and industrial processes.