Investigation of open-type 1 kW-scale thermochemical heat storage system with zeolite 13X for power-to-heat applications

This study investigated thermochemical heat storage with zeolite 13X to provide an insight into the design and operation of a heat storage system for power-to-heat (P2H) applications. The heat storage system consists of a storage chamber with 21.2 liters of its capacity stacked by zeolite 13X. Experiments were conducted based on the variation of operating parameters, such as charging temperature, absolute humidity, and flow rate. The results show that the amount of available heat linearly increases with charging temperature; that is, its value at 220 °C is twice that at 100 °C. The maximum energy storage density is calculated as 0.56 GJ/m 3 . The average heat power varies in the range of 0.4–0.7 kW depending on the amount of supplied water. In addition, a linear correlation between the reacted water and discharged heat is provided. It was confirmed that the thermal storage efficiency was 60–70 %.