Skip to main content

Research Repository

Advanced Search

Charging and discharging in thermal energy storage unit with fin-stone hybrid structure for enhancing heat transfer of phase change materials

Zhang, Shuai; Yan, Yuying; Cheng, Ziming; Wang, Fuqiang

Charging and discharging in thermal energy storage unit with fin-stone hybrid structure for enhancing heat transfer of phase change materials Thumbnail


Authors

Ziming Cheng

Fuqiang Wang



Abstract

This work proposes a fin-stone hybrid structure integrating fins (popular thermal enhancers) and natural stones (widely used sensible heat storage media) to enhance the heat transfer of phase change materials for on-site thermal energy storage applications, with advantages of low cost, environmental friendliness, and easy accessibility. 3D numerical models of charging and discharging in shell-and-tube heat storage units with various configurations, including fins, the fin-stone hybrid structure, stones, and no heat transfer enhancement, were constructed, and the performance evaluation and comparison were carried out. Compared to fins, fin-stone hybrid structures with 20 mm-, 30 mm-, and 40 mm-sized stones shorten the charging time by 67%, 54%, and 56%, and the discharging time by 73%, 60%, and 46%, respectively. Small stones have better heat transfer enhancement, which is attributed to the small volume, large surface area, and contact with the tube and fins. The advantage of the fin-stone hybrid structure, i.e. the shortening of phase change time, is more significant in charging than in discharging, in comparison with stones, as both heat conduction and natural convection are enhanced. Moreover, the hybrid structure exhibits satisfactory temperature stability with a 48.9 °C temperature change in charging and 37.2 °C in discharging, each lower than the fins, which is beneficial to stabilise the heat transfer fluid outlet temperature. The yearly supplied energy of the hybrid structure with 20 mm-sized stones is 121% and 72% more than that of fins and stones, respectively.

Citation

Zhang, S., Yan, Y., Cheng, Z., & Wang, F. (2024). Charging and discharging in thermal energy storage unit with fin-stone hybrid structure for enhancing heat transfer of phase change materials. International Journal of Heat and Mass Transfer, 224, Article 125325. https://doi.org/10.1016/j.ijheatmasstransfer.2024.125325

Journal Article Type Article
Acceptance Date Feb 11, 2024
Online Publication Date Feb 14, 2024
Publication Date Jun 1, 2024
Deposit Date Feb 15, 2024
Publicly Available Date Feb 15, 2024
Journal International Journal of Heat and Mass Transfer
Print ISSN 0017-9310
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 224
Article Number 125325
DOI https://doi.org/10.1016/j.ijheatmasstransfer.2024.125325
Keywords Fin-stone hybrid structure, Heat transfer enhancement, Phase change material, Shell-and-tube
Public URL https://nottingham-repository.worktribe.com/output/31448385
Publisher URL https://www.sciencedirect.com/science/article/pii/S0017931024001571

Files





You might also like



Downloadable Citations