熱電変換モジュールと蓄熱材を用いたカルノーバッテリーシステムの検討

抄録

This paper describes the experimental results of Carnot battery system using thermoelectric modules (TEM) and phase change materials (PCM). In this system, TEM is driven as a heat pump to convert electricity into heat which is stored in PCM in the charging mode. Then, electricity is generated by TEM from the temperature difference between the PCM and the heat sink in the discharging mode. The experimental system performed low round-trip efficiency of 0.33%. The effect of thermal properties of PCM on the round-trip efficiency was investigated via Bayesian optimization, showing that the round-trip efficiency can improve by a factor of 1.4 with the best set of the given thermal properties, however it is still below 1%. Further study to clarify the energy loss mechanism is necessary.