Passive Solar Thermal Energy In Europe  

Renewable Energy World has an article on a plan to greatly expand the use of passive solar thermal energy in Europe - Action Plan for 50%: How Solar Thermal Can Supply Europe's Energy.

The research efforts and infrastructure needed to supply 50% of the energy for space and water heating and cooling across Europe using solar thermal energy has been set out under the aegis of the European Solar Thermal Technology Platform (ESTTP). Published in late December 2008, more than 100 experts developed the Strategic Research Agenda (SRA), which includes a deployment roadmap showing the non-technological framework conditions that will enable this ambitious goal to be reached by 2050.

A strategy for achieving a vision of widespread low-temperature solar thermal installations was first explored by ESTTP in 2006, but since then the SRA has identified key areas for rapid growth. These focus points include the development of active solar buildings, active solar renovation, solar heat for industrial processes and solar heat for district heating and cooling. Meanwhile, amongst the main research challenges is the development of compact long-term efficient heat storage technology. Once available, they would make it possible to store heat from the summer for use in winter in a cost-effective way.

The ESTTP’s main objective is to create the right conditions in order to fully exploit solar thermal’s potential for heating and cooling in Europe and worldwide. ...

Compared to other continents, Europe has the most sophisticated market for different solar thermal applications, with a relatively wide mix of different applications such as hot water preparation, space heating of single- and multi-family homes and hotels, large-scale plants for district heating as well as a several pilot systems for air conditioning, cooling and industrial applications. However, also in Europe, the majority of the new solar thermal systems are installed on residential homes for heating domestic hot water only, with solar typically providing 40%–80% of demand. Nevertheless, there is already a clear tendency towards combined systems for hot water and space heating in countries like Germany and Austria, where 50% or more of the newly installed systems are combined systems. ...

Combined energy conservation measures and increased efficiency in buildings that could slice some 40% of total heat demand would enable solar thermal systems to supply about 20% of the overall heat demand in the EU-27 by 2030.

The long-term potential of solar thermal is to provide about 50% of EU heat demand by 2050, an installed capacity of 2576 GWth or 8 m2 per inhabitant.