关键词: 级联相变储热(CLH-TES), 翅片, 强化传热, 非均匀数量/高度布置, 数值模拟

Abstract: The cascaded latent heat thermal energy storage (CLH-TES) is a kind of TES technology with promising commercial prospects. In this study, we numerically investigate the heat transfer enhancement of a CLH-TES system by adding uneven number/height of fins for different phase change material (PCM) layers (uneven number/height layout). Firstly, for the system adding same number/height of fins for all the PCM layers (even number/height layout), the influence of the number and height of fins on the charging and discharging performance are compared. Then, the charging and discharging performance of the systems with uneven number and uneven height layouts of fins are calculated. The results show, comparing to even number layout，the system with uneven number layout can shorten the total time for the melting and solidification processes by 5.2% and increase the average charging rate by 12.6%. Besides, comparing to even height layout, the system with uneven height layout can slightly decrease the total time for the melting and solidification processes but hardly affect the average charging and discharging rate. The findings can guidance the design of heat transfer enhancement to the CLH-TES with fins.

Key words: cascaded latent heat thermal energy storage (CLH-TES), fin, heat transfer enhancement, uneven number/height layout, numerical simulation