Lenticular Roof Tiles

Previously, I posted an idea for Photo-Responsive Roof Tiles, which could become darker or lighter in colour in order to both reflect more sunlight back into space in accordance with the albedo principle, when the sun is strong, as in summer; But also absorb what light and heat there is in winter by becoming darker...

But this would require a change due to chemical reaction, and may be more expensive as a result.

To this end, I have come up with, what may be a more practical, and cheaper method, purely based on the changing angle of the sun over the seasons relative to the angles incorporated into the design of a roof tile.

The Idea is based on the lenticular holograms that some toy manufacturers use for products, whereby the alternating angle from which the hologram is viewed, shows an apparent difference in the visible picture by revealing more of one kind of image from one angle, and more of another from an alternate point of view.

Using this method to design a roof tile, the surface need not be able to change colour at all, but simply permit the high summer sun to strike a predominantly white upper surface, and so have a high level of reflectivity... but progressively, as the seasons move on, and the sun moves across the sky at a lower angle, closer to the horizon, it's rays strike under these surfaces to the black coloured elements which become exposed to the sun at this time of year, allowing the tile to absorb light and heat.

Viewed from the side (1), and assuming a roof pitch of about 45 degrees, a cross section of such a tile shows the “saw tooth” profile which would allow the necessary seasonal angles to be accomplished, with the red lines describing the angles of the winter sun's rays heating the underside black elements of the tile, while the pencil lines show the angle of the high summer sun striking, and bouncing off into the sky, and then space from the white(r) upper surfaces.

The tile is completed by being encased in a clear glass surface, consistent with the roof pitch angle, so as not to impede it's ability to shed rain water, or offer problematic surfaces for high winds to lift against, but which permits the sun's light to pass through to the respective surfaces and perform their functions.

The last illustration (2), shows the differing contrast in colour when viewing the tile from different angles... with the tile viewed from a casual angle (a), the winter angle (b), and then finally viewed from the perspective of the high summer sun when casting it's rays from above (c).

I think it maybe possible to construct such tiles from recycled glass bottles, which would provide the weight and other qualities required, as well as being green.

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