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Author Topic: How is a Concave glass-clad skyscraper melting cars?  (Read 7947 times)

Offline RD

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Offline Lmnre

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Re: Concave glass-clad skyscraper (doh!)
« Reply #26 on: 12/09/2013 16:33:27 »
Coat the windows with a material that would disperse the reflected sunlight.
 

Offline CliffordK

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Re: Concave glass-clad skyscraper (doh!)
« Reply #27 on: 12/09/2013 19:38:44 »
Coat the windows with a material that would disperse the reflected sunlight.

The best way to disperse the light would be to frost the windows.  Which would damage the usability of the building (no longer able to see out of the south windows).

One option might be to incorporate a Fresnel type cutting of each pane to direct the majority of reflected light in a specific direction for each pane, with only a moderate decrease in visibility.  One could even either magnify or reduce the view if desired.

Cutting the outer pane may be a pain to keep clean.
 

Offline Bored chemist

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Re: Concave glass-clad skyscraper (doh!)
« Reply #28 on: 12/09/2013 20:37:30 »

Eliminate the reflectivity sounds reasonable *


Not to anyone who understood this
"The real solution isn't to try to reduce the reflectivity of the glass (which isn't possible over a really wide bandwidth) but to educate designers and architects so they don't do stupid things."


Bowing the glass (preferably in two directions) would be the best solution, but would still require replacing all the glass which would be expensive.
« Last Edit: 12/09/2013 20:39:44 by Bored chemist »
 

Offline CliffordK

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Re: Concave glass-clad skyscraper (doh!)
« Reply #29 on: 12/09/2013 20:54:38 »
What about simply building another bigger, taller building to the south of the Walkie Talkie building. 

Of course one would loose some of the stunning views, but what are good neighbors for?
 

Offline Bored chemist

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Re: Concave glass-clad skyscraper (doh!)
« Reply #30 on: 12/09/2013 21:21:06 »
Or build a huge negative lens (plano concave, of course) in front of the walkie talkie to cancel out the curved mirror effect.
 

Offline CliffordK

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Re: Concave glass-clad skyscraper (doh!)
« Reply #31 on: 12/09/2013 22:35:19 »
There are coatings that will increase the reflectivity of the glass which are often used for privacy, or perhaps UV and IR coatings.
If that is the case, then replacing the privacy glass with clear glass would help significantly.

If they are already using clear glass, then there may not be a lot one can do.

Looking at the solar panels, there are apparently anti-reflective coatings.  Note, the texture of the glass doesn't make a big difference in the amount of sunlight reflected, but it would change the angles of reflection.

According to the website, the "normal" glass is reflecting about 8-9% of the sunlight.  The anti-reflective glass drops that down to 5-6%.  It doesn't list how clear the glass actually is for visibility, but obviously that would be an issue, especially as the glass ages.

It means the coating could potentially reduce the intensity of the hot spot by as much as half.  While there still would be glare, it may be enough to reduce the number of things that get melted or burnt. 

The interior of a car, or perhaps the dashboard could still get to be quite hot, but cutting the sunlight by half might at least keep exterior parts from melting, as well as reducing the fire danger.
 

The Naked Scientists Forum

Re: Concave glass-clad skyscraper (doh!)
« Reply #31 on: 12/09/2013 22:35:19 »

 

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