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Does more Flow help lower temps ?

post #1 of 7
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since i have a spare pump i want to add that to my loops but would that help lower temps ?
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post #2 of 7
Probably not, but what pump are you using now, and what is the other one?
post #3 of 7
Give or take, is my answer. If your flow is dead slow, the hot areas of the water take longer to leave the block so that cooler water comes in to absorb away more heat. However, it also means that throughout the hot water's journey within the radiator, it has more time to be cooled off by the fans blowing into the radiator. If the flow is stupid fast, the water has less time to be cooled off at the radiator but at the same time, it spends less time hanging out each water block. Having said that, there's only so much the water will heat up given your hardware and there's only so much the water will cool off in the radiator (to your room's ambient temperature). Therefore there are limiting factors but through nominal flow rates, a performance difference temperature-wise is not expected to be present, at all. Not in my view anyway.
    
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post #4 of 7
Nah you don't need to add a second pump to your loop. Your temps are going to be based on how much hardware you have in your loop. Plus the quality of the blocks your using.
post #5 of 7
Quote:
Originally Posted by joe2004 View Post
since i have a spare pump i want to add that to my loops but would that help lower temps ?
It might.
Describe your current loop, specifically the blocks, any quick disconnects and what pump you are using and what pump you are going to add to your loop.

However if you have adequate flow, then the gains if any will be minimal.
For example, between 1 and 2 gpm most blocks will deviate less than 1 degree c. However some blocks will not even budge a quarter degree in that range.

Although you may not have a flow meter, you can use martins flow rate estimator spread sheet (google) to estimate your flow.
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post #6 of 7
it depends, if your pumping slow, then it can cause it to heat up, then again if its moving slow it gives rad's more time to cool off the water, but the water can heat up quicker, if you have faster moving water then the water passing by takes off bits of heat as it moves along and cools it off somewhat faster, so i would think end result, faster flowing is better,
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post #7 of 7
Like most everything in life, there really is not a linear relationship between flow rates and cooling power. As a general rule of thumb much past 1.5 gpm the flow to temp dissipation drops off/plateaus.

So benefits: higher flow, better turbulence in the blocks = better heat transfer per molecule

Downside: laminar flow could be created which is not as efficient at cooling

Benefit: higher pumping power could reduce the amount of dead water or heated water that has stagnated in a block, replacing it with a cooler material

Downside: adding a pump puts as much as 18w worth of heat energy into the loop

Check martin's calculator to see where you stand as it is, and knowing that, I think you should be able to make an educated call as to what is going to work the best for you.
 
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