Flow Rate question

[TheThreeDegrees]

I'm just trying to get me head around the whole flow rate thing.Before I get into it just want to say thanks to Martin for his flow rate estimator excel sheet.

I am in the process of constructing my first WC setup and have all the parts.Just rinced the GPU block(D-Tec Fuzion with Kit) onto the rad next(PA120.3) and using a DB1 pump.Just a single loop for me now.

so here goes the questions..

1.Is it possible to have liquid pumped through a loop too quickly(now i'm not saying the DB1 can:) )?
My thoughts on this are that if you pump liquid around the loop too quickly the rad will not have enough time to cool off the liquid before it gets round to cooling the cpu again.

2.What would be the minimum/ideal GPM/LPM flow rate if there is one?

[Xilikon]

1. flowrate doesn't matter. Even if it is flowing too fast, you make this up by passing the radiator twice as often. In a closed loop, things will reach a equilibrium no matter what.

2. Most will suggest getting at least 1 GPM as a minimum with 1.5 GPM as a sweet spot.

[TheThreeDegrees]

:cool:

One more question.
How far can the RAD be from the rest of the components?
In other words I want to mount the rad near my window which is about 2 metres away from the pc system itself.
Thanks in advance.

[Xilikon]

There is no problem. The only thing to take care would be the flowrate loss by having longer tubes, which can be fixed with a proper pump or 2 pumps in series.

[SparkyJJO]

flowrate of 1.5GPM is a sweet spot huh? What about 2.1GPM :D

[Razor_Blade]

You Iwaki owners suck! ;)

[nonlnear]

Stop thinking in terms of "time in the radiator". There is always the same volume of coolant in the radiator at any one time, no matter what the flowrate is. However, the higher the flowrate, the more turbulence you'll get, and thus the more cooling you get. Just look at any radiators "C/W vs. flowrate" curve. It is a decreasing function (although it pretty much flattens out after a point).

There is a point where high flowrate will start adding heat due to frictional losses, but that's WAAAAY beyond the realm of normal flowrates. Also, this is accounted for as it's part of the heat dump of the pump. (Heat dump includes convective losses due to the pump surfaces being cooled by the fluid, and also the kinetic energy imparted to the fluuid - which is where the frictional losses come from. Conservation of energy FTW.)