Seasonal Power-to-Heat Storage based on Ca(OH)2 - Development of Pilot Plant

Kurzfassung

Until today the space heat demand of residential buildings in northern and middle European countries is still mainly supplied by the combustion of fossil fuels. The sector thus contributes a major share of the yearly energy related CO2 emissions of these countries. One main reason for this is that in winter the availability of renewable energy sources is generally low, while heat demand is at its highest. Simultaneously, renewable production often exceeds the energy demand in buildings during the summertime. To compensate the seasonal discrepancy, a novel seasonal power-to-heat storage for buildings is being developed. Its function principle is based on the thermochemical, exothermal reaction between calcium oxide (obtained from limestone) and water, resulting in calcium hydroxide. The reaction can be repeated as often as desired as long as renewable electricity is available. This presentation will outline our storage system’s development as well as our latest experimental data.