Skylights in transparent plastic bottles

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bebeours
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by bebeours » 29/04/09, 22:14

A skylight is never more than a large stainless steel tube. The kits have been around for a long time. you can do this even with chimney stoves and close with an attic window. The advantage is that it remains hollow and empty and dry, so no maintenance problem.
Diffraction occurs naturally after some bouncing in a tube.
Now we can recover light other than through the ceiling. Windows can be placed between the rooms of a house.
We can also recover the energy of windowless room lighting by optimizing rooms that have windows.
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fthanron
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by fthanron » 29/04/09, 23:25

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Frederic
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by Korben Dallas » 30/04/09, 15:43

Thank you fthanron.

I suspect that it must be very expensive and impossible to make profitable ... like many products allowing to save resources !!
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abyssin3
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by abyssin3 » 30/04/09, 17:12

what difference in the end compared to a glass of the same diameter?
(in terms of brightness)
I went to the renewable energy show (Energissima) last weekend. There were three exhibitors selling skylights. Some can transmit 99% of the light power 10m below (tubes). Others just consist of mirrors (cheaper?) Or even optical fibers (not very efficient, but rather flexible in terms of installation). It's interesting for corners where you can't install a window. But it is still relatively expensive, although compared to installing a window may not be.

Here they are :
www.solatube.ch
www.solarspot.ch
www.puitsolar.ch
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by abyssin3 » 30/04/09, 17:22

: Arrow: fthanron
Those from lumina.ch were exhibited by one of the three exhibitors I mentioned.
These are the ones that work by optical fiber. The interest is that you put a panel on the roof, and with you can feed (for example) a dozen optical fibers including 5 on a primary lighting, 3 on a secondary lighting and two on spotlights. And the fibers pass in the installations like electric wires, but the longer it is the less the yield is good. Whereas with others (tubes), there is much less loss over the length.
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dedeleco
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by dedeleco » 03/02/10, 17:11

Fun, test for physicist!
In summer they must die of heat with uninsulated roofs !!
The holes in the roof without bottles are used to evacuate the sweltering heat in summer!
It doesn't have to rain often to drill holes in the roof.
They have fiber cement roofs full of asbestos and they drill holes and breathe asbestos: in 30 years we will see their state of health!
They put a piece of black garden tube or film, photo to wedge the cap which jumps otherwise, when the pressure rises in the bottle under the sun.
Finally the top of the bottle serves as a lens to concentrate the light in the bottle which serves as optical fiber along its length !!
Result in winter they have hot water and light in windowless cabins among the very poor.
The danger of asbestos is dramatic.
Otherwise very ecological to save lighting without fluorescent lamp;
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by dedeleco » 03/02/10, 17:40

We can make a cheap system with a better concentrating lens in the sun and as optical fiber a transparent flexible plastic tube (or round of cheap plexiglass) full of water or oil with high optical index. The lens in the sun can be a funnel with a transparent cupola hermetic top filled with water or oil. The lens is formed by the spherical, curved, or even conical, surface of the fluid in contact with the dome, which may be semi-rigid plastic sheet already curved and recovered from packaging in large retailers. It can be much larger than the tube, provided that one carefully looks at the path of the light rays (Descartes' laws of reflection).
The yield is less good but given the very low price we compensate with larger diameters.
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