heatsink estimation

elizard · 10th June 2003, 01:32 PM

estimated heatsink rating:

can someone help me estimate the heatsink rating on this particular heatsink?

the dimensions are 5" by 2 1/4", and can be of any length.

the best rating that i was able to come up with so far was 0.6C/W by comparing it to a thermalloy (i think) extrusion, so i just want to confirm this.

Thank You

elizard · 10th June 2003, 01:33 PM

btw, the 0.6C/W rating was for a 12" long heatsink

elizard · 10th June 2003, 01:44 PM

nevermind, found it again
http://www.aavidthermalloy.com/bin/e...3&airflow=57.2

i think that looks about the same

elizard · 10th June 2003, 01:50 PM

now, my question, they have a .63C/W rating at 12" and .73C/W at 9"
can i use 6 of the 12" ones, or 8 of 9" ones for an aleph 5 (both channels, 3/4 per channel)

LaMa · 11th June 2003, 06:48 AM

When you use 3 pieces of 12" the total rating for one channel is about (0.63 [C/W]) /3=0.21 [C/W]

When you use 4 pcs of 9" it will be about (0.73 [C/W]) /4 =0.1825 [C/W]

So when the heatsink is too high (with the finces directed vertically) it is less effective.

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10th June 2003, 01:33 PM	#2
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	btw, the 0.6C/W rating was for a 12" long heatsink

10th June 2003, 01:44 PM	#3
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	nevermind, found it again http://www.aavidthermalloy.com/bin/e...3&airflow=57.2 i think that looks about the same

10th June 2003, 01:50 PM	#4
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	now, my question, they have a .63C/W rating at 12" and .73C/W at 9" can i use 6 of the 12" ones, or 8 of 9" ones for an aleph 5 (both channels, 3/4 per channel)

11th June 2003, 06:48 AM	#5
LaMa diyAudio Member Join Date: Sep 2002 Location: NL	When you use 3 pieces of 12" the total rating for one channel is about (0.63 [C/W]) /3=0.21 [C/W] When you use 4 pcs of 9" it will be about (0.73 [C/W]) /4 =0.1825 [C/W] So when the heatsink is too high (with the finces directed vertically) it is less effective.

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