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Old 11th April 2002, 02:01 AM   #1
Gabster is offline Gabster  Canada
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Thumbs up Real "cool" R-Theta heatsink simulation

Hi folks,

I'm experimenting R-theta's heatsink simulator. It looks very poweful, but I would like to have the seal of approval on my simulation from forum's elders.

DATA:
- My chassis design (see it here) provides a 4"x5" heatsink (R-Theta extrusion# 66414...this is actually what I'm planing to buy) for each IRFP244 FET (Aleph2). Therefore, I've set up 25W of heat to dissipate per heatsink (300W overall...12 FETs).
- From IR's datasheets I've found out that the max. junction thermal resistance is 0.83 for the IRFP244
- I've use generic grease for the simluation, Rimp = 0.1 as suggested by the simulator

You can see the output below. Temperature elevation seems not too bad...this is in fact why I'm doubting and asking your advice.

best regards,
Gabriel
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Old 11th April 2002, 02:02 AM   #2
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Here's the result:
Attached Images
File Type: jpg 66414 simulation.jpg (48.3 KB, 759 views)
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Old 12th April 2002, 01:17 AM   #3
Gabster is offline Gabster  Canada
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I forgot to mention that the ambient temperature is 20C
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Old 12th April 2002, 01:39 AM   #4
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it doesn't look like you've accounted for the electrical insulator ....
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Old 12th April 2002, 01:49 AM   #5
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How do I do that?
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Old 12th April 2002, 03:41 AM   #6
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You could just increase Rimp to about 0.75degrees/W
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Old 12th April 2002, 12:28 PM   #7
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Hello,

I am building a Aleph 4 myself. How can you reach the r-theta simulator. I tried something, but I cannot find anything on their website!

I am going to use 5 times a 80mm x 80mm x 150mm heatsink of 0.5 C/W which gives me about 3 * 21 = 63 * 0.50 = 31 C/W ...


Edwin
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Old 12th April 2002, 12:29 PM   #8
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Default Fischer...

Did any one look at the Fischer Elektronik SKE 6 400 19" case?

http://www.thel-audioworld.de/bauteile/case/case.htm

Thanks,

Edwin
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Old 12th April 2002, 03:20 PM   #9
Gabster is offline Gabster  Canada
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Edwin, website is www.r-theta.com. You can find the simulator in R-tools section. The simulator only works with netscape and some older IE version.

AudioFreak, having the Rimp increased at 0.75 doesn't change the temperature range. The only error I would see is a unit error. There're talking about "Cin^2/W" for Rimp and you're saying "/W". What is a "Cin^2/W"?

regards,
Gabriel
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Old 12th April 2002, 03:31 PM   #10
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it should increase the die temp....

Cin^2/W i think is C x area in square inches / Watts
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