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position of reservoir - Page 2

post #11 of 65
Quote:
Originally Posted by viper37 View Post
Put the reservoir at the highest possible point. It will double as your bleed line and eliminate air issues.
my res in my htpc is even with my pump, but because the level is higher than the pump when full (which is always), my loops bleeds in no time
    
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post #12 of 65
Your point being?
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post #13 of 65
Quote:
Originally Posted by bfgDennis View Post
thanks all for the replies, speaking of reservoirs the cap of my MCRES-Micro reservoir is all warped from all the opening and closing and im having a hard time closing it now
You can ususally get them loose with a pair of needle nose pliers, there is room around i to get it in there....They have PNG chrome plated brass plugs here.McMaster-Carr ..I don't remember the size but I think the plastic plug has the # on it...
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post #14 of 65
Quote:
Originally Posted by viper37 View Post
Your point being?
as long as the coolant level is higher than the pump, the res doesnt have to be the highest point in the loop to see the benefits.

as long as the top of the coolant in the res is higher than the pump, 1. you wont suck air back into your loop, and 2. the bubbles in the coolant will rise and bleed out as the coolant enters the res, regardless of whether the res is at the top of the loop or at the bottom
    
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post #15 of 65
Yeah, the only thing I've been able to find of importance is to keep it close to the inlet of the pump and at least the level high enough to prime the pump.

My first loop I thought I'd be smart and put it on top of my case thinking. Yeah, air rises, this is where it "should be", only to find priming the pump was really really difficult being so far from the pump, and in the end I dribble some in filling into my PSU and fried it!

After playing around with enough different configurations, at 1.5GPM I don't think there is any benefit to putting it at the highest point in the loop. That fluid is moving so fast and our loops like the rads go down and back up as well as the complex blocks, that the though of air rising in the loop just doesn't happy when it's turned on.

I have seen a few "Collapsed suction lines" between the reservoir and pump though, this is because with enough flow and pressure drop between the reservoir and the pump it's possible start running that section in a negative pressure condition...that's not good.

My 2c

Keep it as close to the pump as possible and just barely high enough to fill the pump so it can be primed and move water without running dry at all. Also after my little PSU mishap, I realised it's not a perfect thing filling these things, so having it on the bottom of the case where a little spilling doesn't hurt anything is a GOOD THING especially for me!...
    
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post #16 of 65
I hate having my res low in the loop, they take a long time to bleed...Thats the advantage of a res, bleeding time...I bet those DDC with the res right on top take forever to bleed..I know the Alphacool res tops did we had a lot of guys complaining about them..I've used the Swifty micro-res in a low spot and it just took to long to bleed, not quite as long as a t-line but several hours at least....

I like to use a bay res with a case in the middle or upper bay slot, my pump directly under it on the bottom of the case, that way its gravity fed and you have almost no chance of a dry start, easy to prime to...Throw a thick phone book under the front of the case so the water stays over the barbs in the back of the res and shake your rad, tilt it front to back and side to side and its mostly bleed....

The only time I've had suction line tubing collapse is with a TEC, then its from the heat and it affects any arced piece of tubing, zip-ties take care of that....I used to run dual 18W DDC in series to, the old good ones...
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post #17 of 65
Quote:
Originally Posted by sli_shroom View Post
as long as the coolant level is higher than the pump, the res doesnt have to be the highest point in the loop to see the benefits.

as long as the top of the coolant in the res is higher than the pump, 1. you wont suck air back into your loop, and 2. the bubbles in the coolant will rise and bleed out as the coolant enters the res, regardless of whether the res is at the top of the loop or at the bottom
No but it will make it easier for the pump if it is. The pump pushes the liquid around the loop and into the reservoir. The vacuum created by the pump at the outlet of the res, pulls the water back out again. What aids this process is gravity.

Why do you think Cities put reservoirs on hills with the pumps at the bottom? It sure isn't just because we want to put more pumps in the field.


A res that has a significant distance above the pump aids tremendously in the bleeding process as well.
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post #18 of 65
Maybe what you guys are seeing is a low pressure if your reservoir is perfectly sealed.

Cavitation in a pump is when pressures get below the vapor pressure of water and water litterally boils at room temperature because of the low pressure. The Iwaki test I recently ran was experiencing cavitation in a couple of different points, but mostly high flow rates. Ever heard that air in the pump sound, but there isn't any air in your lines? That's cavitation where it vaporizes due to the low pressure and as soon as it reaches the pump outlet dissolves right back to water.

Close to the suction side of the pump you can experience negative pressure depending on the setup. I'm thinking this is why the EK X-res has problems with vortexing at lower flow rates, but higher pump pressures. If the reservoir isn't vented to the air, then negative pressure could devlope inside and there is a potential for it to get large enough that it reduces the effectivness of air leaving water as you approach the vapor pressure of water.

If you have trouble bleeding a reservoir down low, just open up the filler cap...that'll probably do the trick.
    
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post #19 of 65
Quote:
Originally Posted by viper37 View Post
No but it will make it easier for the pump if it is. The pump pushes the liquid around the loop and into the reservoir. The vacuum created by the pump at the outlet of the res, pulls the water back out again. What aids this process is gravity.

Why do you think Cities put reservoirs on hills with the pumps at the bottom? It sure isn't just because we want to put more pumps in the field.
in a closed loop, the vacuum will be the same no matter where your res is as long as it is sealed. once the fluid goes to the top of the loop, it will create the same vacuum as it goes down the other side. once the suction (siphoning effect) is started, the fluid can be pulled uphill as it goes through the loop. as long as there is a "downhill" section on the other side, it will assist the pump all the same.

and your "cities" example is flawed since that is not a closed loop.

Quote:
Originally Posted by viper37 View Post
A res that has a significant distance above the pump aids tremendously in the bleeding process as well.
again, closed loop so it really doesnt matter. as the fluid enters the res, any bubbles is the fluid will rise to the top of the res. once up and away from the res outlet, they wont be sucked back out of the res and into the pump
    
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post #20 of 65
Quote:
Originally Posted by sli_shroom View Post

and your "cities" example is flawed since that is not a closed loop.
Really, do tell. I would love you to tell me how our Clearwell works. (Awaiting hilarious answer)
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