I'm looking for a large extruded heat sink that is similar to the heat sinks you see inside of electronic loads: it accepts a 8cm fan on the end and the fins are inside, so components can be mounted to the flat sides. I've attached a photo from AliExpress that shows the general shape I'm looking for, but this one doesn't have many fins inside and I'd like to buy from somewhere more reliable if I can.

I've tried DigiKey, Mouser, Arrow and Farnell in the UK. Farnell has some from Fischer Electronik, but they are not long enough (I need 8cm square x 16cm long minimum). Does this type of heat sink have a name? Anyone have more ideas where I could search?

Thx for any ideas,
Brian

 

hi Brian,
Welcome to AAC.
One source of extruded aluminium trunking is from your local office builder, they have loads of 'off cuts' of many styles of trunking.
E
https://www.google.com/search?client=firefox-b-d&q=office+builder+alloy+extrusions

 

I've had limited but good interactions with these folks. Maybe worth a look.
http://www.coolinnovations.com

 

Fischer Electronik heatsinks have a dense fin mesh in their fully assembled ranges. Their LAx range of fan-cooled heatsinks are used by several commercial e-loads. I'm planning to use a LA8-250-12 in my 1500W e-load, thats 250mm long. Here is a link

 

Thanks all, these are some good links to follow up.

 

I'm particularly liking the coolinnovations.com range, specifically these 250mm x 250mm with 4 x 120mm fans which get below 0.03K/W, should shift 1500W easily...

Just waiting on pricing, though I ssuspect shipping from Canada is going to make it non-competitive compared to the Germans...

 

This heatsink
https://ebay.us/9lrZGt
pops up on Ebay very frequently, and seems very good value for money,
It has a lot of very fine fins, hence a large surface area, but there is no spec on degrees C per Watt.
Putting two of them on a pcb, fins facing each other, and a plate on top makes you the fan-tunnel you need.