Pump delivery height help needed

[BellaCroix]

I'm just wondering, the pump I'm planning on using for my next build has an advertised delivery height of 1.2 - 2.1 meters, when all is said and done I'll be using about 10' (3.04 meters) of tubing.

Should I be worried? Is delivery height the ability to pump a vertical column of water like a wet bulb barometer? Since half the loop will be "downhill" is that still okay? Am I going to be grossly underpowered and not able to pump water through the loop? Do I have to start from scratch with my plans and reselect parts?

What does delivery height really measure and how important is it?

Thanks!

 

[Cathar]

If the loop is closed (as in with a closed "down-hill" path), then gravity has no impact. The only impact it has is with filling the loop, meaning that the pump has to be able to pump up to the full height of the loop to fill it with water. If you have a super-weak pump and a high loop, this is typically best achieved by laying the loop flat to prime/fill it with water, and once done, stand it back up again.

 

[BellaCroix]

Thank you Cathar... your help is always OUTSTANDING.

So if I understand, since part of the loop is "downhill" the pressure on the "uphill" part will still be enough to force the fluid through the "downhill" part of the loop... right? Would it still be enough barometic pressure (since I don't know the correct word to use) to push the fluid through the parts above the pump.

The arrangement I'm working on (if it's necessary information):
The reservoir exit/intake and the radiator are located below the pump (about 2"), the CPU block and GPU block is located above the pump (about 12" hose length for the CPU and another 8" for the GPU). The loop is a 8mm ID hose using Innovatek parts except the pump which is an AquaComputer branded Eheim 1046 pump.

Are there any special considerations? Should I fill the reservoir to the brim or can I leave the room to make the "cool swirly water" effect? I'm imagining some kind of hydraulic effect where having a little air in the reservoir and using it as an air trap shouldn't be too much of an issue, am I correct in thinking that way?

When I fill a loop I usually do the "tip the case on each side to try to work out air bubbles/pockets" thing, so I know what you mean... doing that should be enough, right?

Thanks much for your help... I've already too much invested in this project to start over from scratch and really hope I don't have to. PM me if you need other info. I've had drama tonight with some gang members who left a pound of weed in my yard so I'm up the rest of the night anyway (unless they come back to take revenge on calling the cops).

 

[Top Nurse]

If the loop is closed (as in with a closed "down-hill" path), then gravity has no impact. The only impact it has is with filling the loop, meaning that the pump has to be able to pump up to the full height of the loop to fill it with water. If you have a super-weak pump and a high loop, this is typically best achieved by laying the loop flat to prime/fill it with water, and once done, stand it back up again.

Glad you have said this because everytime I tell people I had a Koolance Exos with the box sitting about 9 feet above the computer that worked just fine they kept telling me I was on drugs. New another guy who ran his AC equipped computer in his second story bedroom and just for fun set the pump down on the ground outside the house. Worked fine so long as he primed it first.

 

[Cathar]

Can't see any problem with what you're proposing to do BellaCroix. Should work just fine.