Efficient storage and recovery of waste heat by phase change material embedded within additively manufactured grid heat exchangers
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2021-12
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
International Journal of Heat and Mass Transfer, Volume 181
Abstract
The low thermal conductivity of organic phase change materials (PCMs) hinders their usage for energy storage purposes. We demonstrate a compact PCM-based thermal battery that employs three-dimensional (3D) printed metal surfaces for a robust thermal energy storage and recovery. The thermal battery could be utilized to store excess heat from various sources. The concept includes organic paraffin and fatty acid PCMs embedded within aluminum silicon alloy grid heat exchangers (GHE) produced via additive manufacturing. The heat exchangers consist of two parts: (i) a planar part with embedded water channels and (ii) a surface extrusion grid outside the planar part embedded in the PCM storage system. Three different grid designs are investigated and compared with a simple planar heat exchanger (PHE) without grid extension. The charging and discharging processes of the thermal battery were analyzed experimentally. The laboratory scale experiments reveal that the 3D printed grid surfaces of GHE significantly reduce the charging and discharging time from more than 240 min to less than 20 min. In contrast to PHE, the GHE may increase thermal power by a factor of ∼20 from 35 W to 670 W. Furthermore, the grid structure positively restrains the natural convection flow of the PCM melt, increasing conduction in the highly conductive grid structure and resulting in high charging-discharging power of the thermal battery. The swift charging and discharging with high power and energy density make the compact grid thermal battery a promising solution for thermal energy management.Description
Funding Information: This work was done as part of the LuxTurrim5G project funded by the participating companies and Business Finland (Dnro 1558/31/2019) . The authors thank Senior University Scientist Ari Seppälä for the thermal conductivity measurements. Publisher Copyright: © 2021
Keywords
3D printed heat exchanger, Additive manufacturing, Heat transfer, Phase change material, Thermal conductivity, Thermal energy storage
Other note
Citation
Yazdani, M R, Laitinen, A, Helaakoski, V, Farnas, L K, Kukko, K, Saari, K & Vuorinen, V 2021, ' Efficient storage and recovery of waste heat by phase change material embedded within additively manufactured grid heat exchangers ', International Journal of Heat and Mass Transfer, vol. 181, 121846 . https://doi.org/10.1016/j.ijheatmasstransfer.2021.121846