Hi All,
Thank you very much for all your replies.
The conclusion that I got to, is that the all thermal management for
this enclosure is very badly done and it would explain why everything is
"cooking" in it. This enclosure as a air cooled transformer in it which
as losses of about 12KW (optimistic estimation for 90% efficiency), to
maintain a feasible 45 degrees C the air as to be changed at least every
0.42 Seconds if ambient is 35C. This is clearly not feasible.
I need to start thinking about cooling the air intake.

Best Regards
            Luis 


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Olin Lathrop
Sent: 29 April 2010 16:12
To: Microcontroller discussion list - Public.
Subject: Re: [EE]: enclosure cooling.

Marechiare wrote:
> That's not always true. Turbulence does not always help to cool
> better. Imagine a computer case with silent radiators inside and a
> single fan in the case. Non - turbulent air may stream at higher
> speed.

I was saying turbulence is generally better at the same speed.
Certainly
fast laminar can be better than slow turbulent.

> The molecules may get heated by radiation too

Not in any meaningful sense to this discussion.  Air is basically
transparent to IR for this purpose.

> or through air
> heat conduction mechanism as well.

Meaning convection, apparently, which is exactly what this discussion is
about.


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