This paper reports the appraisal of the solar system’s behaviour applied to a building erected in Ancona in the early ‘80s. The project was born in 1980 and it was presented for the first time during an International Congress in Catania in 1981. This house has been occupied since 1984. It’s a three-storied compact-shaped building including nine flats (six duplex and three simplex). One of them is built in a traditional way while the others are characterized by different passive solar systems: direct gain storage, solar wells, hot greenhouse, cold greenhouse, simple Trombe-wall, lightened Trombe-wall, Trombe-wall with greenhouse, blade interceptor and floor accumulator, ventilated double-glazed window with light deflecting aluminium louvres. After 20 years, an assessment concerning the use and maintenance of the various systems was carried out, underlining different problems such as the raising of the powder and the poor hermetic seal of the valves. As a consequence of these problems some systems have been totally removed and others have been partially used, reducing the thermal performance (for example Trombe-walls with closed vents).
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