Izvorni znanstveni članak
Numerical Exploration of Flow and Thermal Performance in Packed-Bed Cold Storage Enhanced by Structured PCM Capsule Layouts
Yuxuan Zhang
; Research School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
Xiaoqiang Zhai
; Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, 200240, China
Zihao Zhou
; Research School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
Xiaolin Wang
; Research School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
Sažetak
Understanding how the layout of phase change material (PCM) capsules influences the performance of cold thermal
storage systems advances designs that maximize energy storage capacity, minimize energy losses, and improve the
overall sustainability of cooling applications. Based on the closest packing principle of the crystal structure, two lay
outs of the spheres in cylindrical packed beds, i.e. face-centered cubic (FCC) and hexagonal closest packed (HCP), are
proposed in this paper. The flow and heat transfer performance of these two packing layouts is numerically investigated.
Firstly, efforts are made to figure out the thermal-hydraulic mechanisms of different packing layouts under laminar
steady flows. They are compared with the conventional aligned dense layer (ADL) packing with Reynolds number in
the range of 1–200. The results show that, compared with the ADL packing, the theoretical PCM packing density for
HCP and FCC layouts is raised by 22.5%, thus considerably saving the space required of the packed bed. FCC packing
layout achieves the best flow and thermal performance, followed by HCP packing. Secondly, PCM transient thermal
performance in the whole packed beds with the three packing layouts are studied during the charging process. It is
found that the FCC bed has the highest heat transfer capability at a constant flow rate of 100 L/h, with a shorter charging time by 21.4% compared to that of the conventional ADL packing.
Ključne riječi
phase change material; packed-bed cold storage; energy storage density; charging time; pressure loss
Hrčak ID:
331738
URI
Datum izdavanja:
30.4.2025.
Posjeta: 982 *