Abstract

Solar thermal systems have been used for many years starting with passive solar energy use more than 1000years ago and active domestic hot water (DHW) systems more than 100years ago. This chapter starts with an overview of the current market situation and the recent competition in photovoltaics. The components of solar thermal systems follow, starting with solar collector physics, collector types, hydraulics, and stagnation behavior, as well as the functionality of heat storage and hydraulics in and around the store and all other components of the collector loop, are described and analyzed. Then, complete systems starting with thermo-siphon DHW are presented, followed by pumped systems for DHW and solar combisystems (DHW and space heating). Finally, the future research and development demand is presented.

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