Solar collector construction

Claim 1

In a flat-plate solar collector, including an outer frame defining an opening in which an essentially rigid, flat, black collector plate is disposed within the frame, a conduit for collecting heat connected to the collector plate, and a rigid, non-transparent protective cover plate below the collector plate, the improvement for supporting said cover plate and collector plate and reducing heat losses, comprising: a rigid, supportive cell structure having cell walls generally perpendicular to and positioned between and in contact with the central portion of said collector plate with conduit and said cover plate, said cell structure defining a plurality of cell volumes in the flat-plate collector, and said cell structure being disposed within at least a partially evacuated space between said collector plate with conduit and said cover plate. wherein the cell wall areas of said supportive cell structure are reduced between cell wall intersection points to accomodate surface irregularities of said collector plate with conduit, and wherein a heat-reflective film is disposed within said cell structure, said film being held in suspension by said cell structure and being isolated from said collector plate and said cover plate.