Integration of renewable energy systems in urban buildings: From energy conservation to feasible energy supply

The integration of renewable energy systems, mainly active solar ones, in buildings has been an aim of intense research over the last thirty years. Solar thermal systems have become the most widespread, and certainly the most well known RES system, being a commonly accepted solution for hot water production. Within the framework of this paper, which is based on the results of the SEPEDIC-ALTENER project and the Serres project are being analysed all the aspects of RES systems integration in buildings.