Spire geeft Gemini-koeler update

Ja, heb ik gelezen, en heb je zelf je eigen links ook gelezen:
http://www.finishing.com/315/29.shtml
"Will black anodize have a higher emmisivity than clear anodize? Yes; but not much, the emissivity of black anodize is about 0.86, its about 0.83 for clear. This is about the same as oil paint, any color. Heatsinks are anodized and dyed black for looks and corrosion resistance, not because it provides any useful improvement in cooling. [...] The difference between 0.86 and 0.83 is about 1%. I don't consider this a useful improvement, but you might. In the course of our business, we routinely test the thermal performance of out heatsinks (commercially available extrusions designed for this purpose). 1% holds up well for natural convection, its about 1.5% for forced air, as other things come into play with this. Most of our heatsinks are black, because we like the way they look."

Tijdens de natuurkunde les op school (lang geleden) zette de leraar een zwarte, een witte en een zilverkleurige bak ik de zon, in het leslokaal. Na de nodige tijd was er maximaal 10 graden temperatuur verschil. Tussen zilver en zwart. Dat noem ik een verschil. 1%, of 1,5% bij geforceerde koeling, warme afgifte dan, noem ik, en die website, niet de moeite.

Toegevoegd:
http://en.wikipedia.org/wiki/Thermal_radiation
"Lighter colors and also whites and metallic substances absorb less illuminating light, and thus heat up less; but otherwise color makes small difference as regards heat transfer between an object at everyday temperatures and its surroundings [...] Thus, except in sunlight, the color of clothing makes little difference as regards warmth; likewise, paint color of houses makes little difference to warmth except when the painted part is sunlit."

Nog beter:
http://en.wikipedia.org/wiki/Black_body
"As the temperature increases past a few hundred degrees Celsius, black bodies start to emit visible wavelengths, appearing red, orange, yellow, white, and blue with increasing temperature. [...] Blackbody radiation becomes a visible glow of light if the temperature of the object is high enough."

Kortom, als je zwarte cooler, met de propeller uitgezet, gloeiend heet word, geeft zwart meer warmte af dan licht geverfd materiaal ...
Wordt ie wel erg stil van, trouwens

[Reactie gewijzigd door Xubby op woensdag 3 augustus 2011 11:26]