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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ive been needing more and more heatsinks in a compact area but milling fins or buying them seems expensive.
So im looking at some possible solutions.
These paralled and zigzagged thin walled tubes would be solders together. The strip would then support all of them and the TO-220 or TO-247 case. these tubes could be different in number or zig zagged around other component on a board or case.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I share the concerns expressed by others.
I've made my own in the past, and researched this sebject extensively beforehand.
While the maths that manufacturers publish on their websites is debatable, they all agree on certain basic 'rules of thumb'.
What's generally considered best is to mount the pachage on thick material (copper or aluminium), then have branches off this 'thick bit', then have fins on the branches.
Most manufacturers go for thicker branches with more fins nearer the component.
Heatsinks work in two ways, firstly, they conduct the heat away from the component as fast as possible, then they dissipate the heat, pretty obvious really.
I'd mount the tubes longitudinally on the branches, with longer branches nearer the component, if going with your basic idea.
If using copper and tubing, though, I consider rethinking, and maybe adoptong liquid cooling, with the tubes carrying the liquid, certainly something to be considered.
My Mk1 TO3 heatsink consists of a basic 'H' section, with fins. I do have a Mk2 in the pipeline which only consists of five pieces, rather than all the bits of plate clamped together with compound in between.
These are designed to have two 120mm PC fans, one either end, one sucking and the other blowing, and are a bit 'overkill', but you can see the 'H' section quite clearly. This is the second one I made, with basic hand tools only. The first had a thicker central plate. The whole thing is wrapped and taped when in use.
Needless to say, I've never blown a 2N3055 using one of these.
Soldering copper together does sound like a pretty good idea, though.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ok, im also researching the "heat pipe" idea. the passive movement of heat through a pipe interests me. but putting pumps on every tiny circuit i need doesnt appeal to my budget.
Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
Patrick wrote ...
ok, im also researching the "heat pipe" idea. the passive movement of heat through a pipe interests me. but putting pumps on every tiny circuit i need doesnt appeal to my budget.
aren't heat pipes contain a liquid-gas mixture that evaporate al the hot end and condensate at the cold end thus transferring heat?
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Tubular Heatsinks.
