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Alt: CFM calculator to get rid of HEAT (TDP or WATTS)



 
 
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  #1  
Old May 18th 11, 10:56 AM posted to alt.comp.borland-delphi,alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia,alt.nl.electronica.zelfbouw,nl.comp.hardware
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

Alternative thread in case original thread don't produce no results or some
miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise find
watts listing) and GPU could have as much as 200 to 300 TDP (watts) (top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing ) /motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D





  #2  
Old May 18th 11, 11:12 AM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Paul
external usenet poster
 
Posts: 13,364
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

Skybuck Flying wrote:
Alternative thread in case original thread don't produce no results or some
miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise find
watts listing) and GPU could have as much as 200 to 300 TDP (watts) (top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing ) /motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D


CFM = 3.16 * Watts / Delta_T_degrees_F

Say room temperature is 72F, case air temperature target is 90F,
computer watts is 200 watts.

CFM = 3.16 * 200 / (90 - 72) = 35CFM

You can get around three times that airflow rating from a fan like this,
but you don't want to be sitting next to this. The fan draws
12V @ 1A and should not be connected to the motherboard header.
You can run this off a Molex drive connector.

http://www.circuittest.com/cfa121203...l-bearing.html

DDR3 memory DIMMs are around 2W. Hard drives are less than 12W. Your
800W number needs to be reworked.

Paul
  #3  
Old May 18th 11, 11:15 AM posted to alt.comp.borland-delphi,alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia,alt.nl.electronica.zelfbouw,nl.comp.hardware
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default CFM calculator to get rid of HEAT (TDP or WATTS)

Hmmm... could be really simple...

Wikipedia shows conversion chart:


http://en.wikipedia.org/wiki/Convers...heat_flow_rate

1 atmosphere-cubic foot per minute = 47.820 074 682 24 W

Which is probably close to 48 Watts.

But this is atm-cfm and not cfm hmm... not sure if that is same thing... but
for now I'll go with it

So (800 * 60) / 48 = 1000 CFM needed ! =D


Let's see if antec case is sufficient lol:

http://www.antec.com/pdf/manuals/1200_EN%20manual.pdf

It's about 240 CFM...

So there is no way that the antec 1200 case would be able to cool such a
system sufficiently.

Yes perhaps the graphics card would output a little bit of air as well...
but it's waaayyyy too little.

And this manual probably assumes at maximum operating fan speed... so let's
divide 240 by 2 is 120 CFM... and let's divide it one more time because of
dust is only 60 CFM.

Yeah...

Well it's pretty clear where this is going:

OVERHEAT DAMAGE ! =D

Bye,
Skybuck

"Skybuck Flying" wrote in message
. home.nl...
Alternative thread in case original thread don't produce no results or
some miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise find
watts listing) and GPU could have as much as 200 to 300 TDP (watts) (top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing ) /motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D







  #4  
Old May 18th 11, 11:23 AM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

It might seem "we computer people" are getting fooled/scammed by
specifications ((unrealistic)CFM).

I sure hope that's not the case because then all of your calculations are
wrong...

and with "your" I mean everybody that used CFM.

You might want to read up on this stuff:

http://en.wikipedia.org/wiki/Actual_...eet_per_minute

"real cfm"

For now after a quick glance I am thinking my atmosperic calculations might
actually be closer to the truth

Time will tell ! =D

Bye,
Skybuck.

"Paul" wrote in message
...
Skybuck Flying wrote:
Alternative thread in case original thread don't produce no results or
some miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise find
watts listing) and GPU could have as much as 200 to 300 TDP (watts) (top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing ) /motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D


CFM = 3.16 * Watts / Delta_T_degrees_F

Say room temperature is 72F, case air temperature target is 90F,
computer watts is 200 watts.

CFM = 3.16 * 200 / (90 - 72) = 35CFM

You can get around three times that airflow rating from a fan like this,
but you don't want to be sitting next to this. The fan draws
12V @ 1A and should not be connected to the motherboard header.
You can run this off a Molex drive connector.

http://www.circuittest.com/cfa121203...l-bearing.html

DDR3 memory DIMMs are around 2W. Hard drives are less than 12W. Your
800W number needs to be reworked.

Paul



  #5  
Old May 18th 11, 11:35 AM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

Another nice website:

http://www.truetex.com/aircompressors.htm

Mentions pressure must be added to the equation of "CFM"

Manual of antec1200 mentions "static pressure".

(it's something like 0.something ! yeah ! lol)

Gonna look that up

Bye,
Skybuck.


  #6  
Old May 18th 11, 11:48 AM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

More interesting stuff:

http://extension.usu.edu/files/publi...ry_Vent_03.pdf

Bye,
Skybuck.


  #7  
Old May 18th 11, 12:03 PM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Rob[_19_]
external usenet poster
 
Posts: 63
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

On 18/05/2011 11:23, Skybuck Flying wrote:
It might seem "we computer people" are getting fooled/scammed by
specifications ((unrealistic)CFM).

I sure hope that's not the case because then all of your calculations are
wrong...

and with "your" I mean everybody that used CFM.

You might want to read up on this stuff:

http://en.wikipedia.org/wiki/Actual_...eet_per_minute

"real cfm"

For now after a quick glance I am thinking my atmosperic calculations might
actually be closer to the truth

Time will tell ! =D

Bye,
Skybuck.

wrote in message
...
Skybuck Flying wrote:
Alternative thread in case original thread don't produce no results or
some miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise find
watts listing) and GPU could have as much as 200 to 300 TDP (watts) (top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing ) /motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D


CFM = 3.16 * Watts / Delta_T_degrees_F

Say room temperature is 72F, case air temperature target is 90F,
computer watts is 200 watts.

CFM = 3.16 * 200 / (90 - 72) = 35CFM

You can get around three times that airflow rating from a fan like this,
but you don't want to be sitting next to this. The fan draws
12V @ 1A and should not be connected to the motherboard header.
You can run this off a Molex drive connector.

http://www.circuittest.com/cfa121203...l-bearing.html

DDR3 memory DIMMs are around 2W. Hard drives are less than 12W. Your
800W number needs to be reworked.

Paul


Paul's calculation is correct. He knows what he is talking about.
--
Rob
  #8  
Old May 18th 11, 12:22 PM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Paul
external usenet poster
 
Posts: 13,364
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

Rob wrote:
On 18/05/2011 11:23, Skybuck Flying wrote:
It might seem "we computer people" are getting fooled/scammed by
specifications ((unrealistic)CFM).

I sure hope that's not the case because then all of your calculations are
wrong...

and with "your" I mean everybody that used CFM.

You might want to read up on this stuff:

http://en.wikipedia.org/wiki/Actual_...eet_per_minute

"real cfm"

For now after a quick glance I am thinking my atmosperic calculations
might
actually be closer to the truth

Time will tell ! =D

Bye,
Skybuck.

wrote in message
...
Skybuck Flying wrote:
Alternative thread in case original thread don't produce no results or
some miss it ! =D

Important topic ! =D

Hello,

I'm curious if it's possible to build a powerfull PC/iCore/GPU/Cuda PC
without getting into heat problems !

For example CPU has about 30 TDP (which is close to watts, otherwise
find
watts listing) and GPU could have as much as 200 to 300 TDP (watts)
(top
model for maximum bandwidth).

Additional watts for memory( 20 watt ? just guessing )
/motherboard (10
watt ?)/4 harddisk (60 watt*4=240)

Let's say 800 watts.

How much CFM would be needed to get rid of all that heat ?!?

A CFM heat (PC) calculator would be most handy... maybe somebody can
make/program it.

What would be good formula's to use ?!?

Bye,
Skybuck =D


CFM = 3.16 * Watts / Delta_T_degrees_F

Say room temperature is 72F, case air temperature target is 90F,
computer watts is 200 watts.

CFM = 3.16 * 200 / (90 - 72) = 35CFM

You can get around three times that airflow rating from a fan like this,
but you don't want to be sitting next to this. The fan draws
12V @ 1A and should not be connected to the motherboard header.
You can run this off a Molex drive connector.

http://www.circuittest.com/cfa121203...l-bearing.html


DDR3 memory DIMMs are around 2W. Hard drives are less than 12W. Your
800W number needs to be reworked.

Paul


Paul's calculation is correct. He knows what he is talking about.


That's the only equation I know of, off hand. I'm not a thermal engineer,
and cribbed that off a web page that detailed how to put a computer
into an enclosure, and ensure it got enough cooling air. I expect
there is some room for using pressure curves for the fan, but I
don't know the first thing about that. I had an engineer at work,
who used to do that part for us. When you work in a big company,
you're generally "stuck in a silo".

Paul
  #9  
Old May 18th 11, 12:25 PM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

More interesting stuff, in case my calculations are off, but pressure does
play a roll as does temperature of air:

http://en.wikipedia.org/wiki/Standar...eet_per_minute

Bye,
Skybuck.


  #10  
Old May 18th 11, 12:33 PM posted to alt.comp.periphs.mainboard.asus,alt.comp.periphs.videocards.nvidia
Skybuck Flying[_2_]
external usenet poster
 
Posts: 1,459
Default Alt: CFM calculator to get rid of HEAT (TDP or WATTS)

Really interesting stuff:

http://en.wikipedia.org/wiki/Heat_transfer

Getting down to basics now lol... getting down to the core of it ! =D

Bye,
Skybuck.


 




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