抄録
The fundamental heat balance was evaluated by numerical simulation for a solar heat system with long-term latent heat thermal energy storage using supercooled phenomena. The supercooled thermal energy storage (Super-TES) stores thermal energy at temperatures lower than the melting point of the phase-change material, which reduces heat loss from the storage system. The thermophysical properties of disodium hydrogenphosphate dodecahydrate were used for the calculation. From the results of the calculation, we found that Super-TES exceeds conventional latent heat thermal energy storage (LHTES) in both energy and exergy efficiencies to store surplus solar heat in the summer till the winter. The difference in efficiency between Super-TES and LHTES increases with increasing period of the storage in the supercooled condition Especially, Super-TES contributes for saving available energy (exergy) more than for saving energy.
