Skylight tube with infrared heat transfer
A skylight shaft substrate has a film or coating on its inside surface that reflects visible light while transmitting IR to the tube substrate, which can have a satin black and/or other IR absorbing interior and anodized or other high emissivity exterior to convey heat across the tube so that light is transmitted down the tube but heat transmission is directed through the tube to minimize heating the illuminated space. Or, heat may propagate up through the tube and exit through a clear plastic dome covering the tube.
1. An apparatus comprising:
a substrate defining a first substantially black inside surface to absorb infrared light and a second outside surface rendered emissive of heat propagating from the first substantially black inside surface; and
a substance associated with the first substantially black surface that substantially reflects visible light impinging on the substance and that substantially does not reflect IR light impinging on the substance.
2. The apparatus of claim 1 , further comprising an adhesive disposed between the substance and the substrate.
3. The apparatus of claim 1 , wherein the inside substantially black surface has a satin substantially black finish.
4. The apparatus of claim 3 , wherein the outside surface is anodized or has other high emissive qualities.
5. A skylight assembly, comprising:
a transparent dome;
at least one skylight shaft substrate extending away from the dome to convey light entering the dome through the shaft substrate;
a spectrally selective film or coating juxtaposed with an inside surface of the shaft substrate to substantially reflect visible light and to substantially transmit IR light;
a means associated with the substrate for conveying heat from an inside surface to an outside surface of the shaft substrate; and
wherein the means includes a satin black or other IR absorbing inside surface.
6. The assembly of claim 1 , wherein the means for conveying heat includes an anodized or other high emissivity outer surface of the substrate.
7. A skylight shaft assembly, comprising:
a hollow shaft substrate defining an inside surface and an outer surface; and
a substance associated with the inside surface that substantially reflects visible light impinging on the substance and that substantially does not reflect IR light impinging on the substance; and
wherein an inside surface has a satin black or other IR absorbing finish.
8. The assembly of claim 7 , wherein the outer surface is anodized or has other high emissive qualities.
9. A skylight shaft assembly comprising:
a hollow shaft substrate defining an inside surface and an outer surface; and
means associated with the inside surface for substantially reflecting visible light but not IR light;
wherein the means for reflecting is a spectrally selective film bound to the inside surface by an adhesive; and
wherein the inside surface has a satin black or other IR absorbing finish.
10. The assembly of claim 9 , further comprising means associated with the substrate for conveying heat from the inside surface to the outer surface of the substrate.