Compact energy storage by Alternative Storage methodology

Publieke samenvatting / Public summary

For an average household, the thermal energy demand amounts to 47 GJ/year of which roughly 80% is needed for space heating. Next to this, the utilization of sustainable energy will increase, which requires a means to store heat over longer periods of time, since the energy supply period (e.g. by solar PV/thermal collectors in summertime) does not match that of the energy demand (e.g. in wintertime for space heating). Further implementation of distributed renewable energy will eventually not have an impact on the actual energy demand in buildings. Therefore, a compact and cost effective heat storage is needed, especially for the existing building stock.

The aim of the consortium is to develop a very compact storage unit for the exisiting building stock, that will be cost effective with other storage technologies.

Korte omschrijving
Using a technology previously developed for CO2 capture, a new type of thermal energy storage is developed which has a storage capacity 5 times higher than conventional thermochemical storage technologies. By connecting the technology developed within the COMPAS project with excess renewable electricity from i.e. solar PV panels, energy from the summer can be stored for use as heat in the winter. This technology thereby offers a solution for both seasonal thermal heat buffering and peak shaving from distributed renewable energy supplies. Other advantages include: • Highly flexibility: the system is flexible in fuel choice, operating with a variety of fuels during the summer, such as natural gas or renewable hydrogen, as well as flexibility in design, being modular in nature and able to be made with custom dimensions. Furthermore, systems can also be designed to provide heat on daily or weekly cycles in addition to seasonal. • Very efficient: due to the nature of the heat release mechanism, no losses will occur between the fueling of the system in the summer and the supply of the heat during the winter. • Suitable for renovations: with a high capacity of > 6 GJ/m3, the system

The result of the project is a working system prototype. The prototype will clearly prove the potential of the technology and allow for fast commercialization, with only one more development phase needed between the prototype and a full scale system. Next to the physical system, analyses of the business case and environmental impact will be key results that will further motivate the further development of CLC for energy storage. The existing building stock is the main target, but given the flexibility in the design, storage units for single dwellings as well as systems at district levels can be envisaged.