Abstract: An energy saving grate installed outside a building or structure in warm weather that reduces heating due to infrared radiation (IR) from sunlight. For a window application the grate acts as a sunshade to block or diffuse the IR and ultraviolet (UV) portions of sunlight while passing visible light. The grate cell size, depth, cell surface characteristics, and mounting details near the sash determine system performance of sunlight control, of the view through the grate, and of the exterior appearance. The grate is removable for cool weather. The grate system can cool various surfaces and requires no operating adjustments. It can be applied near most windows (including skylights) on all sides of a building where impinging sunlight causes unwanted heating. Compared to external solar thin mesh screens the grate system can provide more open area for a given performance in reduced IR heating.

Abstract: An energy saving grate system installed outside a building or structure in warm weather that reduces heating due to infrared radiation (IR) from sunlight. For a window application the grate acts as a sunshade to block or diffuse the IR and ultraviolet (UV) portions of sunlight while passing visible light. The grate cell size, depth, cell surface characteristics, and mounting details near the sash determine system performance of sunlight control, of the view through the grate, and of the exterior appearance. The grate is removable for cool weather. The grate system can cool various surfaces and requires no operating adjustments. It can be applied near most windows (including skylights) on all sides of a building where impinging sunlight causes unwanted heating. Compared to external solar thin mesh screens the grate system can provide more open area for a given performance in reduced IR heating.