Chemisorption heat storage in buildings: State-of-the-art and outlook

•Theoretically, chemisorption can store up to 800 kW h m−3.•Practically, it is difficult to reach higher density than 200 kW h m−3.•Research is necessary to increase the technology readiness level.

Chemisorption is a promising solution for long-term heat storage with a high energy density. Considering application to buildings, heat storage can be used for space heating and domestic hot water production. In the present work, the specification requirements of a heat storage system for buildings are given. A review on chemical heat storage materials is carried out and reactor development is discussed. Some future research topics are presented in the conclusions.