I knew someone who built one of those ploystyrene bead window insulation
systems. They have a shop vac in the basement wired to suck the beads out of
the window, then switched a valve to blow them back in again.   Worked
pretty well until static charge built up all over the beads, and they all
stuck to the window.  They never did get it to work very well after that.  I
have always wondered if there was another material that would suffice for
this system, that would not build up static and cling to everything.  This
would be a really cool way to automate a solar heating system with a lot of
extra efficiency.  Putting up moveable insulation every night is a pain in
the %$#%@.

--Lawrence

>
> Blown polystyrene beads inside a double glazed frame is used by some
people
> to make an unusual automated blind - beads are blown to and from storage
and
> window frame as required. .
>
>
>         RM
>
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