Solar-active-houses - analysis of the building concept based on detailed measurements

Nine solar-active-houses are analyzed in detail within the project "HeizSolar". In solar-active-houses, more than 50% of the total heat consumption for space heating and domestic hot water preparation is covered by solar thermal energy. The analysis reveals two different approaches to reach such high solar thermal fractions. A solar thermal fraction of 100% is feasible; however long- term heat storage is a major challenge.