Power-density enhancement of composite materials using open-cell foams for thermochemical energy storage

Le résumé fourni par la source

Thermal energy storage technologies are essential for the efficient use of surplus heat and renewable energy.Thermochemical energy storage using a calcium hydroxide/water/calcium oxide (Ca(OH) 2 /H 2 O/CaO) reaction system possesses high energy storage density and is suitable for long-term storage.However, pure Ca(OH) 2 powder has a low thermal conductivity and poor bulk stability with volume changes and agglomeration.In this study, we focused on composite materials using Ca(OH) 2 and silicon-impregnated silicon carbide (Si-SiC) foams to address aforementioned shortcomings.This study investigated the effects of foam porosity (89-95%) on the heat storage/output rate of the composite and cycle durability using a laboratory-scale packed bed reactor.The composites with Si-SiC foam porosities of 92 and 95% exhibited the highest heat storage rate during Ca(OH) 2 dehydration of 0.60 kW L bed -1 , which is 1.4 times that of pure Ca(OH) 2 powder.The composite with a Si-SiC foam porosity of 95% also exhibited the highest heat output rate during CaO hydration of 1.15 kW L bed -1 , which is 1.5 times that of the pure powder.The composite foam maintained a high reactivity and did not form centimeter-scale agglomerates during the 15 cycles.The results of this study provide significant insights into the optimization of foam structures in composites with high power density and cycle durability for thermochemical energy storage.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.