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Old 25th March 2013, 05:12 PM   #1771
oiphy is offline oiphy  Norway
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thanks guys, these are well documented points. actually learning something here


There is an advantage to blowing in is that an air filter can be placed over fan grille to reduce dust buildup as positive pressure is maintained inside cabinet. For dusty environments, this would be preferable at expense of reduced cooling efficiency.[/QUOTE]
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Old 25th March 2013, 05:22 PM   #1772
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Quote:
Originally Posted by xrk971 View Post
only reason
Farmer Hick thinks a fan lasts longer with ambient air going through it, than heated air.
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Old 25th March 2013, 05:27 PM   #1773
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Farmer Hick thinks a fan lasts longer with ambient air going through it, than heated air.
more like = if you design your case for forced air cooling think about airflow and where you want it if you want to differentiate for some reason in front or back......left rigt... up down... so on.
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Old 25th March 2013, 05:29 PM   #1774
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You mean instead of blowing hot air out, then suck it back in, out, in, out.....
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Old 25th March 2013, 05:42 PM   #1775
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But, Do have a cat in the house, Pusy hair clogs up the filter... And, where are you then. Another waf issue?
Damn them, Just try bein a dog!
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Old 25th March 2013, 06:02 PM   #1776
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Quote:
Originally Posted by jacco vermeulen View Post
You mean instead of blowing hot air out, then suck it back in, out, in, out.....
more like sucking out big hole. let different amount of cool air in different places
and guide the flow over the parts need cooling ... excuse my poor english.
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Old 25th March 2013, 06:54 PM   #1777
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Quote:
Originally Posted by jacco vermeulen View Post
Farmer Hick thinks a fan lasts longer with ambient air going through it, than heated air.
What do you care about more? A $10 fan or your $500 (in parts and pieces -not retail assembled value) amp? Seriously though, a ball bearing brushless DC motor designed for continuous operation in these fans will run 7 to 10 years before breakdown.
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Old 25th March 2013, 07:01 PM   #1778
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Typical Euro engineering itch, setting it up to last 20 years instead of 7-10.
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Old 26th March 2013, 10:25 AM   #1779
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look at any laptop man. no laptop in this world sucks air out
every fan that is mounted under blows air in. every fan mounted on the top sucks air out.
in almost any case with i front/rear mounted fan, the top lid has no vents, so they will be sucking air out(or one blowing in front and one sucking in the back).
you will not get the hotair sirculation with wents on top(hot air rises). but you also lose the ability to rackmount it.
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Old 26th March 2013, 11:54 AM   #1780
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Audio San,
I don't want to argue with you regarding basic thermal management concepts in engineering. And you are wrong, I have several laptops (Dell's) that have fans sucking air out - you can see the blades. They switched to internal fans with use of lower power chips that have heatpipes conducting heat to conveniently placed heatsink at exit of fan shroud internally.
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