Interesting heatsink on ebay

[BrianGT]

This might be good for a project. Pretty big and made to use fans in a push/pull configuration:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1757246329

--
Brian

 

[tiroth]

Looks like some serious cooling...that is a lot of fins!

 

[BrianGT]

There sure are! I am wondering if it could cool a stereo aleph 5, with fans cooling the heatsink in a push-pull configuration.

--
Brian

 

[tiroth]

Some very hasty application of the 50/sqrt(A) formula says 0.25-0.33 C/W. Air cooled, maybe 3 times better than that?

At any rate, a nice sink.

 

[BrianGT]

I would think that this heatsink would definately require air cooling, unless you put it vertical, so that the air can rise through it naturally. I think that it could easily cool a stereo aleph 5, given air cooling.

--
Brian

 

[dice45]

All,
such heatsinks require fans. The fins are too close for passive convection.

www.fischerelektronik.de sells such stuff, too. Thermal resistance down to 0.02 K/W.

 

[peranders]

The heatsink may be manufactured by Aavid. They make heatsinks with pressed fins.

http://www.aavid.com

 

[UrSv]

Reading the auction details (forgive me for the capitals, it is a quote) I would say there is a definite chance that it is Aavid:

"YOU ARE BIDDING ON AN AAVID HEATSINK BUILT TO ORDER THAT IS 18.625" LONG BY 7.375" WIDE BY 4.750 HEIGHT"

/UrSv

 

[Peter Daniel]

I'm using similar heatsinks in one of my amps. The fin spacing is even better and the fan is necessary. I bought one big piece and cut it in 4. Cost me $40.
The one on E-bay might be difficult to accomodate a fan. As you know the fans come in square sizes so if you put one directly on a sink, some fins will not be vented.