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Pump+res at the top or the bottom?

post #1 of 12
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Due to room issue, I'm considering turning the front upside down, and put the res+pump combo at the bottom of the case.

My current setup, has the res at the top.
Problem is that by this, there is no air going motherboard try, and I have room issues with the 5.25 pays.

I hope this picture will give a better understanding:


The 5.25 bays, have their sides right at the motherboard tray.
Meaning I can't put anything there which is not very short.
Also it bothers me a bit room wise.

This is the front:


If I turn the front upside down, I have the top fans blowing air onto the system.
But the res will be at the bottom, which means a bit extra tubing, and I don't know how it will be affected (and also not very easy to fill up).
I'm planning to swap the res into a res+pump combo, so if I keep it all at the top, its a lot less tubing, and its all almost direct into the motherboard tray.

Any ideas?
Just keep it as it is?
I actually want a hot-swap bay for the HDDs, which I can't put in right now as there is just no room for anything.
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post #2 of 12
As long as the res and pump are in that order it's fine- you might run a length of tubing from the top of the res up to a fillport on the top just to ensure that it's at the top of the loop, but the pump won't have any problems with the extra height.
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post #3 of 12
I agree with saltwatercooled for the most part, except needing to make a fillport at the top. It's unnecessary, but if you want it, it may be more convenient to fill things up.
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post #4 of 12
Just make sure that the order is like Res>Pump and reservoir is above pump. This is to make sure that the pump is getting water through inlet port not air.
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post #5 of 12
Quote:
Originally Posted by Tsumi View Post
I agree with saltwatercooled for the most part, except needing to make a fillport at the top. It's unnecessary, but if you want it, it may be more convenient to fill things up.
Problem with having a sealed res at the bottom is that if you open it to refill and it's at the bottom, ie you don't turn the case, then it's going to overflow on you since it's the lowest point. If you have a line coming off the top then you can fill from the top and not have to move the case around. You don't need to mount the fillport in the top, but you should at least have a run up tuning that gets up above the highest point in the loop...
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post #6 of 12
Quote:
Originally Posted by SaltwaterCooled View Post
Problem with having a sealed res at the bottom is that if you open it to refill and it's at the bottom, ie you don't turn the case, then it's going to overflow on you since it's the lowest point. If you have a line coming off the top then you can fill from the top and not have to move the case around. You don't need to mount the fillport in the top, but you should at least have a run up tuning that gets up above the highest point in the loop...
No, it won't. The water will be trapped via suction as there is no way for the air to get into the loop at the top.

The position of the pump doesn't change how much work it's doing, because the total sum of work = resistance of loop + difference in height between waterline of reservoir and top of reservoir

Which basically means that if you place the pump at the bottom or top of the case it will be under the same amount of load (disregarding the restriction caused by the extra tubing required for the mount).
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post #7 of 12
Quote:
Originally Posted by charliehorse55 View Post
No, it won't. The water will be trapped via suction as there is no way for the air to get into the loop at the top.

The position of the pump doesn't change how much work it's doing, because the total sum of work = resistance of loop + difference in height between waterline of reservoir and top of reservoir

Which basically means that if you place the pump at the bottom or top of the case it will be under the same amount of load (disregarding the restriction caused by the extra tubing required for the mount).
Not to be rude, but I know the physics too. The downside to relying on that balance is that wiggling the case, or having a setup where the air can enter the loop and release the suction can give you a wet floor in no time. You can mount it however you want, but for my piece of mind there's no question that I'd spend $4 and put the extra tubing up a little ways.

Edit: To be clear, there's no problem with the pump being mounted at the bottom, it's having the res, or at least the fillport at the bottom that I strongly recommend against.
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post #8 of 12
Another pro of having the pump on the bottom is easy draining - just leave a little bit of tubing slack near the pump, and then when you want to drain simply pull the pump/res combo out over a bucket and let it drain out.

Also Saltwatercooled, I have had a setup like that before and I have found that shaking the case doesn't do anything - it wasn't until I took off another hose and gave the air another entry point did water being to backflow through the reservoir.
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post #9 of 12
Quote:
Originally Posted by charliehorse55 View Post
Another pro of having the pump on the bottom is easy draining - just leave a little bit of tubing slack near the pump, and then when you want to drain simply pull the pump/res combo out over a bucket and let it drain out.

Also Saltwatercooled, I have had a setup like that before and I have found that shaking the case doesn't do anything - it wasn't until I took off another hose and gave the air another entry point did water being to backflow through the reservoir.
Good point about the draining, as for the second, I had issues with a setup like that before, at a relatively small difference in height. No question you can have waterlocks, it's just not worth the risk for me. Then again I'm a t-line guy and not a res anyway, so I always have the extra tubing run...
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by SaltwaterCooled View Post
Problem with having a sealed res at the bottom is that if you open it to refill and it's at the bottom, ie you don't turn the case, then it's going to overflow on you since it's the lowest point. If you have a line coming off the top then you can fill from the top and not have to move the case around. You don't need to mount the fillport in the top, but you should at least have a run up tuning that gets up above the highest point in the loop...
I'm not sure.
I used to have a res in the middle of the case, where the radiator ports, and the cpu blocks were much above it.



The top fill hose from the res I have removed on a later date, and ended up putting the reservoir at the back of the case outside without the little tubing at the top and bottom of it.
When I opened it to fill, water did not just came out of it unless I opened another tubing connection if that is what you mean.

Filling the system for the first time, I might run into problems tho.
I don't know.

I'm going to use the koolance 402X2, so the pump and res will be combined together, so pump below res will not be an issue.
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