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Unread 10-22-2004, 08:59 PM   #6
DDogg
Cooling Neophyte
 
Join Date: Oct 2004
Location: Texas
Posts: 60
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Quote:
Originally Posted by bigben2k
Yep.

http://www.nordichardware.com/articl...vattenkylning/

Go to page 2 for the formulae:
P*t/(C*m)=DT

Where:
P=power
t=time
C=constant 4190 J/(kg*K)
m=mass of water
DT=temp difference
Thanks for the replies, especially the link. bigben2k, it seems like you are a near librarian for many of us. A personal thanks for that. I've learned a lot from some that you have posted.

Along those lines, and since I have liberally applied the butter, have you run across any in depth testing of the popular pumps where the the amount of heat dumped into the circuit was measured in lab or semi-lab conditions?

I'm particularly interested in the 12 volts pumps where the cooling effects of flow changes, via overvolting or undervolting, might be negated by changes in the waste heat.

My question may not be clearly stated, so let me clarify a little.

If you increase flow via overvolting, you would also increase the heat dumped into the system which may negate any cooling gains. Inversely, lowering the voltage might decrease flow but also decrease heat dump. I'm basically trying to find the X spot.

People talk about using 2 Swiftech pumps in series, yet they consume 25 watts each so that is 50 watts. Since I don't know how much heat is dissipated from the case to air and how much is dumped into the loop, it is hard to judge whether that would be a good idea. 50 watts into the loop seems self defeating?

I'm sensitive to this because I installed a groundloop and added a larger pump rated at 70 watts to replace my 10 watt fountain pump. It increased my flow like crazy, yet drove up cpu and inlet temps. That was a real eye opened and I don't think I would have noticed if I did not have the constant temp of the groundloop constantly monitored in front of me.

Any information you can point me to would be appreciated.

Last edited by DDogg; 10-22-2004 at 09:08 PM. Reason: clarification and spelling
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