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dshortt9 22nd October 2002 04:15 AM

Big Heat Sinks
 
These heatsinks can be placed face to face and the center channel that is formed is perfect for a standard 4 11/16" muffin fan. They ar rated at 0.28 C/W without airflow each. With airflow Aleph 1.2's may be within reach.

http://www.meci.com/

24.75" Heavy Duty Aluminum Heat Sink
Heavy duty heat sink comes in two lengths. 24.75" long x 7" wide x 3" tall Each has 5/8" holes and a place for our 1800V Phase Control Thysistor (280-0397) Great for big power supplies and amps.



MECI Part Number: 310-0282 Qty:
Price: $29.95

David Huang 22nd October 2002 04:50 AM

Big Heat Sinks
 
I'm confusing this catalog. They have another 5 1/2" heavy duty heat sink $9.95, but has same description,and both have same pictures. I have e-mail to MECI but no answer. So I no idea is it a good deal?

herm 22nd October 2002 02:08 PM

dshortt9;

If I understand correctly, the heatsink rating given by the Aavid thermalloy website is based on a single point source of heat. If you spread 12 IRFP240's out per sink, I believe you will achieve much better dissipation than the .28 shown.

I think that the 500 watts could be dissipated by two of these without fan cooling.

One 3" section gives a .8 rating. Let's say you were mounting just 8 FETs per sink - we could calculate an aggregate .1 degree per watt for each sink. 250 watts per sink would give a 25 degree rise. This is not a completely accurate assumption because air flow over a 8 single 3" pieces is completely different than over one 24" section. However, I think that we can use the horseshoes and handgreandes principle and say close enough.

Any one out there have the sinks up and running yet? I would
like to know how close the theoretical calcs match up to the real world.

herm

Apex Jr 22nd October 2002 03:06 PM

Heat Sinks
 
I stock a pair of heat sinks that you can also
slide together and mount a 4 11/16" fan to
also they are drilled for 10 TO-3 devices
and are on my new arrival page at www.apexjr.com
price is $25.00/pair
Steve
Apex Jr

dshortt9 22nd October 2002 03:25 PM

They have another 5 1/2" heavy duty heat sink $9.95

This one is shorter, they used the same picture to show the cross section of the sink. Apex gave me the idea to try them this way and they work. Both are excellent values. C'mon, build those Pass amps! Hmmm... 500 watts no air... Kilowatt Pass X's?

cowanrg 22nd October 2002 06:03 PM

do you think these heatsinks would be adequate for aleph2 monoblocks? cut the 24" ones down to 18" and have 1 per side?

BrianGT 22nd October 2002 06:04 PM

I would just leave them the same size and have two per channel, as you can never have too much heatsinking.

--
Brian

cowanrg 22nd October 2002 06:09 PM

er, yeah, but thats TOO big. i dont want the thing to look horrible...

so would 18" not be enough cooling? i assume that 1 of these per channel wouldnt be enough either. (if im doing stereo aleph2's, would one per channel be enough?)

i just dont want a component thats 24" deep, thats way too big to fit anywhere.

hifi 22nd October 2002 06:12 PM

why not cut them in half? and have them per side, standing upp..? that would improve the cooling efficiency by 20%

/micke

BrianGT 22nd October 2002 06:16 PM

I was thinking of the wrong heatsinks... I was thinking of the other big heatsinks that they used to offer.

Cutting them in half seems like the best plan to me and would provide a better looking chassis.

--
Brian


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