h a l f b a k e r yInexact change.
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Black paint emits heat much more than white paint, and white paint reflects heat much more than black paint. Thermochromic paint changes colour depending on heat... So why not paint houses in a specialized mixture, so when it gets too hot, the south-facing sides of a house turn white, and the north-facing
sides of a house turn black. And vice versa (and vice versa again, if you're in the southern hemisphere).
May not save *that* much on heating/cooling bills, but would be funky to look at.
Example of thermochromic paint
http://gathering.tw...ew_message/31830667
In this project, they've put thermochromic paint onto a PCB - when current travels through the wires, it heats up slightly and changes the colour of the paint. Goes from black to white in about 3 seconds. [mitxela, Sep 15 2009]
[link]
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Could be cool... or hot I reckon... depending on the need. You might want to extend this thought to roofs as well. Just sayin'... |
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Let me know when you invent this top-secret paint and I'll be sure to pick up 5 or 10 gallons. (+) |
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If you come up with this 'magic' formula, you could even develop other formulas for it to blend in with its environment. Perfect to camoflauge the house, or for hunters and the like... |
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I wouldn't think paint but rather shape changing
surfaces. |
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You've got my bun, but ougn't this idea be in product:paint ? |
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the "chromic" part doesn't have to be in the visible light spectrum... it's IR that causes most heating. |
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to get a noticeable effect, you would have to have a thermal link between the interior space and the exterior paint - this is what most insulation is trying to avoid... |
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Thermochromic paint is already quite diverse in what it can do, I see no reason why this couldn't be done with today's technology, other than perhaps cost. |
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Thinking about it, it may be better to coat the whole house in e-paper and have a thermostat inside which can switch the outside colour from white to black almost instantly. That would easily be doable. You'd also probably be able to display e-books on the walls too, as an added bonus. |
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+- If the color change is able to homeostatically modify the rate of temperature change of the substrate, (Though I am not sure how much energy can be regulated this way) it would also decrease the continual expansion and contraction of the wood. In the US south, this would lead to longer paint jobs, decreased exterior moisture damage, decreased board splitting, caulking etc. |
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