Abstract
Regenerative thermal storage systems are becoming increasingly popular for recycling large amounts of waste heat generated in industrial furnaces every year. In order to improve the efficiency of regenerative burners, encapsulated phase change material consisting of an Al–Si alloy core sealed in a spherical ceramic shell has been proposed as a promising heat storage material. This is due to its melting temperature of 850 K, high heat storage density, and high heat storage rate under high-temperature operating conditions (over 773 K) with a short burner switch time. This study conducted rapidly heat storage simulation based on finite element method, heating and cooling tests and microstructural analysis to compare the properties of conventional solid alumina heat storage balls with those of the proposed core–shell heat storage ball with different Si concentrations. It was confirmed that the core–shell ball can store latent heat and is superior to the conventional solid alumina ball in terms of heat storage rate and heat storage density. The eutectic composition of Al–12.2% Si was determined as the optimal core composition for rapid high-temperature heat storage owing to its high heat phase change rate and density over a short time.
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