Building an Aelph 1.2

[vpharris]

Looks like about .55 degrees C per watt.

Thermally it is close, yes. I am using 0.4 to allow for a fudge factor.
Anthony

Keep in mind that that data from Thermalloy was for 3 in. length. And if you're trying to be conservative, your number should get bigger rather than smaller. A 'not-bad' approximation of the equivalency between this sink and yours can be gotten from looking at the in^2/in. numbers of the two sinks.

 

[BrianGT]

Anthony,

That looks like a good design, and I would use 8 heatsinks per channel with it.

--
Brian

 

[Coulomb]

My question is did you get the dimension orientation all mix up or did I misunderstood your post? I personally would always want the fins to point vertically up, not sideways.

Hello Fcel, the answer is yes. Between the time I put the first post up and when I put the drawings togeher, I realized the flue's should be vertical as you say and not horizontal. Not only di d this change the orienation, it also changed the heat sink count from 6 to 8 for aesthetics', as I want the finished product to look more conventional in design.

Anthony

 

[fcel]

Anthony,
Sorry, I still don't quite understand how you're aligning the heatsinks. To me, conventional way means having heatsinks fins pointing up which means if you have 4 heatsinks on each side, your amp would be approximately 40" long which would make it the longest amp that I will ever see.

 

[Coulomb]

your amp would be approximately 44"

Hello Fcel,

They are to be stacked 2 high, if you look at my drawing, imagine you can see the second row of heat sinks on top of the first. The 4 heatsinks becomes 8, the dimensions would be approx 14" wide x 20" deep x 10" high.

I will try to post a photo of the parts in a rough layout tonight.

Anthony

 

[fcel]

quote "They are to be stacked 2 high"

Sorry, I did not read that you meant stacked 2 high. Now, I "see" what you meant.

 

[herm]

The Aavid-Thermalloy approximation was based on a 4.875"
length.

-herm

 

[Coulomb]

The Aavid-Thermalloy approximation was based on a 4.875"

Hello Herm, I suck at math, so what kind of rise above ambiet Temperature, assume 23 Deg C, is 8 of my heat sinks per channel going to result in?



Anthony

 

[Coulomb]

use correct orientation

Hello Peter, I assume you mean the same as Fcel, with the flue's in the vertical plane so heat can rise and escape the chassis unobstructed?

Anthony

 

[Peter Daniel]

Yes. I would go even one step further and trim one end of ea.heat sink, so when you put them side by side all fins in the center (where they connect) are equal length. Your amp would be less deep and look better. You got more heat sink area than required anyway. Just a thought.

 

[PedroPO]

Anthony,

I saw your pdf and it remind me my aleph 5 that is under constructions now.
the chassis is almost done, and the electronics just need wiring.

see these two pics to see if it inspires you.

 

[PedroPO]

another one

 

[Peter Daniel]

 

[herm]

Coulomb;

OK, so the Aleph 1.2 dissipates 500 watts per channel.
One of your heatsink is about .55 degrees C per watt.

Since you have 8 of them, your aggregate rise will be
.55/8=.06875 degrees C per watt.

Lets multiply that times the 500 watts youare trying
to get rid of and we get 500 * .06875 = 34.375 degrees.

Add on your 23 degrees ambient, and your grand total
looks like 57 degrees celsius (or 134 fahrenheit).

-herm

P.S. Your mileage may vary ...

 

[Coulomb]

Thanks fcel, 57 Deg. that is totally cool, pardon the pun. I was hoping to come in under 55 Deg, but 57 Deg. is quite acceptable.

Anthony

 

[Coulomb]

Nice work so far Pedro, but your beautiful heat sinks seem somewhat under utilized.

Anthony

 

[Coulomb]

Hey peter, I will have to think about the straight cut look, I was thinking the wave effect would look kind of cool. We will have to think about it some more.

Anthony

 

[Peter Daniel]

somewhat under utilized.

You mean hard chance to get up to 57 deg.?

 

[Peter Daniel]

It may look cool, but I personally prefer more pure and simple forms.

 

[Coulomb]

Trimming the heat sinks in the fashion you suggest would lob 2" off each side (redundant, as you would not do one side only).
leaving a taper at the front and back, I can see where the appeal of form blending with function would appeal to a classic lines type shuch as yourself Peter.

Anthony