1) Trombe wall 2) Trombe-Michel wall 3) solar wall 4) collector-storage wall 5) mass Trombe wall a collector wall, consisting of a massive south-facing, concrete wall, which is painted black and covered with a sheet of glass. An air-space runs between the concrete and the glass; the chimney effect causes the heat to rise; openings at the bottom and top of the wall allow the cold air along the floor to be circulated through the air space GRM: n. (1,2,3,4,5) USG: the above system is sometimes termed "mass Trombe wall" as opposed to "water Trombe wall" where water is employed as the thermal mass (5) Note: passive solar approach invented by F. Trombe and J. Michel References: GENcollector wall GENwall-collector GENvertical collector