Real "cool" R-Theta heatsink simulation

Gabster · 11th April 2002, 01:01 AM

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

Gabster · 11th April 2002, 01:02 AM

Here's the result:

Gabster · 12th April 2002, 12:17 AM

I forgot to mention that the ambient temperature is 20ºC

AudioFreak · 12th April 2002, 12:39 AM

it doesn't look like you've accounted for the electrical insulator ....

Gabster · 12th April 2002, 12:49 AM

How do I do that?

AudioFreak · 12th April 2002, 02:41 AM

You could just increase Rimp to about 0.75degrees/W

Edwin Dorre · 12th April 2002, 11:28 AM

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

Edwin Dorre · 12th April 2002, 11:29 AM

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

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

Thanks,

Edwin

Gabster · 12th April 2002, 02:20 PM

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 "º/W". What is a "Cin^2/W"?

regards,
Gabriel

AudioFreak · 12th April 2002, 02:31 PM

it should increase the die temp....

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

11th April 2002, 01:01 AM	#1
Gabster diyAudio Member Join Date: Feb 2002 Location: MTL < QC < CAN	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

12th April 2002, 11:29 AM	#8
Edwin Dorre diyAudio Member Join Date: Apr 2002 Location: Netherlands	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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12th April 2002, 12:17 AM	#3
Gabster diyAudio Member Join Date: Feb 2002 Location: MTL < QC < CAN	I forgot to mention that the ambient temperature is 20ºC

12th April 2002, 12:39 AM	#4
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	it doesn't look like you've accounted for the electrical insulator ....

12th April 2002, 12:49 AM	#5
Gabster diyAudio Member Join Date: Feb 2002 Location: MTL < QC < CAN	How do I do that?

12th April 2002, 02:41 AM	#6
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	You could just increase Rimp to about 0.75degrees/W

12th April 2002, 11:28 AM	#7
Edwin Dorre diyAudio Member Join Date: Apr 2002 Location: Netherlands	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

12th April 2002, 02:20 PM	#9
Gabster diyAudio Member Join Date: Feb 2002 Location: MTL < QC < CAN	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 "º/W". What is a "Cin^2/W"? regards, Gabriel

12th April 2002, 02:31 PM	#10
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	it should increase the die temp.... Cin^2/W i think is ºC x area in square inches / Watts

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