Screen preventing heat loss through window - has heat-reflective but non-opaque screen of slats or foil on, or in front of window pane

摘要

The screen unit is intended for reflecting (R) heat radiation back into a heated (14) space (10) to reduce heat loss, partic. through windows (11). A heat reflecting screen in the form of slats (18), a grid and/or foil, which does not obscure incident light, is arranged on the window pane surface or at a distance from it. The screen may be permanently fixed (19,20) or removable and may be adjustable relative to the direction of the incident light. The slats may have an L-shaped cross-section with one transparent and one opaque portion adjustable to have either one or the other portion parallel to the window pane.