Half a croissant, on a plate, with a sign in front of it saying '50c'
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Thermal self regulating window

window adaptation that controls radiant energy flow based on temperature
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The idea is a window that will let more heat in during winter and less during summer. Def half baked because the heat transfer is multidirectional and prob many other reasons

Any way what the kind of working part is is a polarised sheet as part of the window, that is on tensioners which are controlled by a say metal with a significant thermal expansion coefficient. This applies tension to the sheet which changes the spacing of the polarization thus changing the range which the sheet absorbs

lostmind, Apr 08 2008

Physical (rather than electro-chemical) polarisers http://annex.jsap.o.../vol04/4d411tx.html
Physical so the dimensions and therefore the properties can be varied. I couldn't find a better link, but the truth is out there... [neutrinos_shadow, Apr 08 2008]

Thermal window http://www.horn-aps.dk/
Alvaar Aalto developed a simpler version in the 1930s that relied on human power (to open and close vents). There is a modern development that claims to be self-regulating: [harperolocito, Apr 09 2008]

Galileo Shades Galileo_20Shades
Shameless self promotion. [Zimmy, Apr 11 2008]

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       May I suggest, for a low-tech implementation, Venetian blinds with a bimetal spring controlling the shutter angle?
afinehowdoyoudo, Apr 09 2008
  

       Curtains?   

       Electronically controlled, if you must.
Texticle, Apr 09 2008
  

       yeh tis an easy option. but say an office would look better if it didnt have those things obscuring the view. Its still pretty low tech or possible to make more low tech.
lostmind, Apr 09 2008
  

       I'm too lazy to go dig for this, but I read a couple of years back that a transparent film had been developed that changed IR-transmissive properties at a set temperature (I think it was 29 C).   

       The idea was that during winter, the film's temp would drop below 29 degrees, and cause a change that allowed more IR in. Above 29, the opposite.   

       BTW, 29 is not the air temp, just to be clear, but is the temp of the film.   

       So... baked in the lab I'm afraid, but not in use as far as I know. Perhaps something about a yellowish tinge.
TIB, Apr 09 2008
  

       (link)
Zimmy, Apr 11 2008
  
      
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