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Old 6th June 2003, 07:29 PM   #1
elizard is offline elizard  Canada
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Default heatsinks - powder coating?

Well I'm probably going to be ordering some heatsinks that are not anodized. Now, having read some stuff, I've read that anodized heatsinks, because of their color (i think that's what i read) have better emmisivity (higher) and therefore have an improved rating.

Would the same be true for powder coating a heatsink? Like a black powder coat? Or would the powder coat actually trap the heat within the heatsink itself, since its an additional layer of 'paint' on the heatsink?
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Old 6th June 2003, 07:43 PM   #2
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powder coating will derate the heatsink considerably...and anodizing is purely for asthetics

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Old 6th June 2003, 08:08 PM   #3
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Default actually...

according to Aavid Thermalloy:
(from their 'selecting a heatsink' pdf)
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Old 6th June 2003, 08:21 PM   #4
Netlist is offline Netlist  Belgium
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Haha, there we go...

From http://mitglied.lycos.de/Promitheus/heatsinks.htm

"If the surface temperature is kept low, for example by forced ventilation, radiation transfer is negligible because the heat is constantly being transported away. The anodized layer is more likely to have an adverse effect on transfer resistance because it has a thermal insulating effect. In cases forced ventilation is installed, especially when it has a string air flow, an untreated or chromated heatsink is most suitable."

/Hugo
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Old 6th June 2003, 08:31 PM   #5
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in conclusion: flip a coin.
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Old 6th June 2003, 08:42 PM   #6
elizard is offline elizard  Canada
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soooo ..
forced air - non-anodized
no forced - anodized/painted

the problem i'd see with anodizing is expense, powder coating would be a LOT cheaper for me
but i can see problems w/ powder coating and the paint trapping the heat
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Old 6th June 2003, 08:45 PM   #7
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Color does matter. Make it black, somehow.

The explaination I got was, "the same principle that makes a black object absorb heat is the same principle that allows it to give up heat."

I remember seeing (although I can not site where) that flat black paint is just as good as anodize.

The subject was covered in a thread called:

Chrome Heat Sinks

Do a diyaudio.com search

Good news: Painting can be done in your garage with common materials, anodize cannot.
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Old 6th June 2003, 08:48 PM   #8
elizard is offline elizard  Canada
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well if i were to opt out for painting, it would be powder coat
its more durable, and looks better i think

i'm still curious to hear if the painting does affect the heatsink's ability to dissipate heat somehow (non-color oriented)
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Old 6th June 2003, 08:53 PM   #9
elizard is offline elizard  Canada
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well i found the chrome thread, and read it
it answers my question as far as whether to make it black or not - black is better, even mr. pass says so

but i'm still curious as to whether the paint used for powder coating will isolate the heatsink from air and hinder the heat exchange LOTS

btw, this is important, as the heatsink will most likely (if i get it) be used for an aleph .. and we all know they run hot enough for this to matter
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Old 6th June 2003, 08:56 PM   #10
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hahaha...I opened up a can of worms here...I was basing my statement on actual testing that I have done...but being an Extremist its my nature to over do it..hmmmm..maybe thats why I have 6 fans in my computer???? good info you guys posted despite it all

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