1. Dr. Volker Wittwer Fraunhofer-Institut für Solare Energiesysteme ISE Solar thermal systems: affordable clean energy

2. Breakdown of final energy demand in EU25

4. Thermal power of the annually installed solar thermal collectors

9. In future the building envelope will be used not only for protection and for aesthetics of the building, but in addition to absorb solar radiation and cover the energy demand of the building

13. * higher potential with extensive off-shore wind energy conversion Sustainable potentials of selected renewable energy sources, examples modern biomass 100 EJ/a wind * 140 EJ/a hydro 15 EJ/a solar quasi unlimited

14. Original building Case study : h o t e l r e n o v a t i o n