Tokyo Institute of Technology · Engineering
Professor Shigehiko Funayama's research lab specializes in thermochemical energy storage (TCES) using the calcium oxide/calcium hydroxide/water (CaO/Ca(OH)₂/H₂O) system, focusing on enhancing heat transfer and material stability in high-temperature applications. The lab develops advanced composite materials—particularly those incorporating silicon carbide/silicon (SiC/Si) foam—to overcome limitations such as poor thermal conductivity, particle agglomeration, and volume changes during cyclic reactions. Their work combines experimental validation with numerical modeling to optimize reactor performance, aiming for practical, large-scale thermal energy storage with high energy density and long-term durability.
Figures are computed from collected data and may differ slightly.
Abstract Thermochemical energy storage using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH) 2 /H 2 O) reaction system is a promising technology for thermal energy storage at high‐temperatures (400°C‐600°C). The purpose of this study is to develop a practical composite material by enhancing heat transfer through the reaction bed and mitigating problems of pure CaO/Ca(OH) 2 materials, such as formation of centimeter‐scale agglomerates and change in the bulk volume during repetitive reactions.
Abstract Thermochemical energy storage (TCES) using reversible gas‐solid reactions is a promising technology owing to the high energy density and capability of long‐term storage. TCES using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH) 2 /H 2 O) reaction system has attracted considerable attention because of the low material cost and environmental friendliness of the reactants. Previous experimental studies have focused on the TCES performances of packed beds of calcium oxide/calcium hydro
• Numerical model for a composite of Ca(OH) 2 and Si–SiC foam was validated. • Composite with a foam porosity of 94% exhibited maximum power density. • Maximum power density at 5 min for the optimal composite was 0.97 kW L −1 . • This maximum power density was 1.6 times that of the pure Ca(OH) 2 powder. • Lower porosities inside the foam pores decrease the optimal foam porosity. The hydration of calcium oxide (CaO), a reaction that releases heat to produce calcium hydroxide (Ca(OH) 2 ), finds ap
Thermochemical energy storage is a promising technology for storage and output of heat. Some thermochemical energy storages use reversible gas-solid reaction to transform thermal energy into chemical energy which could be stored semi-permanently. The thermochemical energy storage using calcium oxide and water system was focused on in this study. Storage materials of powder of calcium hydroxide or calcium oxide have small practical feasibility because of its aggregation and activity degradation d
1．化学蓄熱の研究動向
Thermochemical energy storage using a calcium oxide/calcium hydroxide/water reaction system is a promising technology for large-scale energy storage because of inexpensive material cost and high energy density. However, low thermal conductivity (~ 0.1 W m-1 K-1) of storage materials can be a limitation for practical storage reactors that have high speeds of thermal response. Development of composite materials combining the storage material with high thermal conductivity materials is required to
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