| rlsusenet@NOSPAMPUHLEEZschnapp.org 2005-07-17, 4:25 am |
| Robert Morein wrote:
quote:
> "Yeung Fun Ho" <shaolin_master@oriental.com> wrote in message
> news:ZuCdnY9gqejojUXfRVn-vw@comcast.com...
> [snip]
>
>
> roof
>
>
> In cold winter climates temperate climates, does a white roof present a
> potential problem with ice buildup?
Interesting question. I wonder if anyone has tried to develop a
long-lasting thermoochromic paint that's dark when it's cold, and light
when it's hot. Hmmmmm...
I used to have a mug from Science News that had thermochromic printing
on it. It was dark brown at room temperature, and clear at above 120 F
or thereabouts.
There are some interesting Google results for thermochromic pigments
(http://tinyurl.com/9zwej) that might be very useful in this
application. A nice black pigment that transitioned to white or clear
(painted over a white base, say) at around 80 F could be very handy for
painting roofs. Make it in some more interesting dark colors, and it
might be pretty good on south (north, in the southern hemisphere) or
west-facing walls.
Gee, I'd think there ought to be some significant money in such a
product! Unless, of course, the pigment is hideously expensive, or
degrades too quickly.
My Science News mug eventually stopped reacting to heat.
|