Microencapsulation of Metal-based Phase Change Material for High-temperature Thermal Energy Storage

Abstract

Latent heat storage using alloys as phase change materials (PCMs) is an attractive option for high-temperature thermal energy storage. Encapsulation of these PCMs is essential for their successful use. However, so far, technology for producing microencapsulated PCMs (MEPCMs) that can be used above 500°C has not been established. Therefore, in this study, we developed Al-Si alloy microsphere MEPCMs covered by α-Al2O3 shells. The MEPCM was prepared in two steps: (1) the formation of an AlOOH shell on the PCM particles using a boehmite treatment, and (2) heat-oxidation treatment in an O2 atmosphere to form a stable α-Al2O3 shell. The MEPCM presented a melting point of 573°C and latent heat of 247 J g−1. The cycling performance showed good durability. These results indicated the possibility of using MEPCM at high temperatures. The MEPCM developed in this study has great promise in future energy and chemical processes, such as exergy recuperation and process intensification.

VO2-dispersed glass: A new class of phase change material

“…Moreover, some hazards are inevitable, i.e., damage to the container because of the large volume change occurring during the phase transition and leaking out of the liquid. In these circumstances, it is of particular interest in developing new candidates for novel heat storage material, e.g., λ-trititanium pentoxide (Ti 3 O 5 ) based solid–solid phase transition, microencapsulated metal-based PCM, and so on 7,8 : Vanadium dioxide (VO 2 ) exhibits a strongly correlated electron system, which exhibits a structural phase transition at 68 °C. A reversible change is observed between the monoclinic (low-temperature phase) and tetragonal (high-temperature phase) crystal structures accompanied with an exothermic or endothermic reaction (Fig.…”

Microencapsulation of phase change materials with binary cores and calcium carbonate shell for thermal energy storage

“…The increasingly serious energy crisis and environmental pollution are required for efficient energy storage technologies, thereinto thermal energy storage (TES) plays a vital role in needs [1,2]. Application of Phase change materials (PCMs) provides feasible and valid way to improve the efficiency of energy storage and utilization.…”

Solvothermal method as a green chemistry solution for micro-encapsulation of phase change materials for high temperature thermal energy storage

“…metals); (2) PCMs with solid to liquid transitions commonly show volume expansion and consequently they suffer thermal stress; (3) to reduce these problems, thick shells are used producing the drop of heat storage density [23].…”

“…For high tempearute range, inorganic salts were reported as best candidates. The main storage properties of some PCMs are presented in Table 3 [13][14][15][16][17][18][19][20].…”