Phase Change Materials Reinforced with Aluminium Foam for Latent Heat Storage

¹Institute of Materials & Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9/6319, 845 13 Bratislava, Slovakia

²Faculty of Materials Science and Technology, Slovak University of Technology, Jána Bottu 2781/25, 917 24 Trnava, Slovakia

Adv. Mater. Lett., 2021, 12 (3), 21031612

DOI: 10.5185/amlett.2021.031612

Publication Date (Web): Jan 06, 2021

Copyright © IAAM-VBRI Press

E-mail: ummsjerz@savba.sk

Abstract

The structure of aluminium foam is highly porous consisting of aluminium (or its alloy) filling up the space among gas pores. Although pores formed during foaming of aluminium melt are closed, there are always microscopic cracks in the walls of solid foam, so that the porosity is predominantly open. This preference of aluminium foam allows to fill pores with a Phase Change Materials (PCMs) capable repeatedly to store and release a huge amount of latent heat of phase transition from solid to liquid state and vice versa. The excellent thermal conductivity of the aluminium, forming the pore walls, predetermines aluminium foam castings for the production of highly efficient heat exchangers in various industrial sectors, especially in the building industry. The most promising technique for the production of near-net-shaped structural components containing a dense aluminium surface skin and porous inner foamed aluminium structure is powder metallurgical route. Lightweight self-supporting interior ceiling panels impregnated by PCM presented in this contribution, utilize their high mechanical stiffness and their ability to store large amounts of latent heat at a constant temperature. The application of foamed aluminium appears to be very promising also for heat exchangers covering the entire pitched roof of the building which provides not only the better recovery of the heat from the building surroundings but also the dissipation of unwanted excess heat from the interior when needed.

Keywords

Aluminium foam, heat exchangers, phase change materials, heat storage, energy efficiency.