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Brain Fart - reservoir downward pressure

post #1 of 10
Thread Starter 




Just got a brain fart while thinking about reservoirs. Does the reservoir have to be at the highest point of the system?
Wouldn't the downward pressure from the 360 radiator want to fill up the reservoir completely, possibly even causing enough pressure for water to leak from the drain plug?
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post #2 of 10
Its is just recommended that you have your res above your pump. I dont think it matters if you rad is lower or higher than your res/pump but I'm not positive. I like my rad on the top though.

Your sketch looks good to me.
Edited by UsedPaperclip - 5/21/11 at 7:22pm
post #3 of 10
'downward pressure' not an issue.
Best if the pump can be the lowest thing in your loop, but as long as the res is higher than the pump, your good.
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by bob808 View Post
Best if the pump can be the lowest thing in your loop, but as long as the res is higher than the pump, your good.



Phase 3. Pump/res ok?
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post #5 of 10
How about mounting the bottom rad on the back? If its a 140 that it would be perfect.
post #6 of 10
Looks good. Just to reiterate once more: make sure your res is directly feeding your pump. Otherwise, the pump'll run dry, which you don't want to do.

@usedpaperclip, that looks more like a 240/280 to me
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post #7 of 10
Quote:
Originally Posted by Buska103 View Post
Wouldn't the downward pressure from the 360 radiator want to fill up the reservoir completely, possibly even causing enough pressure for water to leak from the drain plug?
No. Water in a closed loop like this can be thought of as effectively weightless so long as the air is out. The best way to demonstrate this would be by looking at the siphon. Water flowing down one tube will actually draw water up the rest of the tube to replace it.

If both the inlet and outlet of the res are submerged then for water to flow from the 360 to the res some other water would have to be sucked from the res into the tubing. As there is no net change in fluid height this flow will not take place (ignoring any thermal effects).

If the res inlet is not submerged then yes, there is a possibility that the water will drain from the 360 into the res. This will happen if air can make it's way up the tubing, allowing the water to be displaced. This may or may not happen, depending on your tubing.

For example, dip a drinking straw into a glass of liquid, put your finger over the top end and lift the straw out. The liquid will stay in the straw until you remove your finger. This is because the surface tension of the water is able to overcome it's weight in the straw. Now try doing the same with a bigger tube, something like the inner of a kitchen roll (yes I know it is cardboard, but it will survive long enough to prove the point). This time the water will fall out, as the surface tension is not able to overcome the water's weight and air can move up the tubing.

To make sure everything works nicely I would recommend always having both the inlet and outlet of the res submerged. Not only will this prevent the water flow that you are worried about, it will also reduce the chance of bubbles being formed and drawn into the loop.


Tl,dr:
Keep your res in and outlet submerged and you will have no problems.
The vertical position of the res is unimportant as a closed loop full of water is effectively weightless.
Res needs to go above pump for priming during first startup.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by GingerJohn View Post
No. Water in a closed loop like this can be thought of as effectively weightless so long as the air is out.
Would I have problems if I ever opened the fillport to fill the loop up?

Or if I was draining it, I would have to open the fillport to allow air to enter the loop, replacing the water being drained?
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post #9 of 10
No and Yes.

In that order
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post #10 of 10
Quote:
Originally Posted by Buska103 View Post



Phase 3. Pump/res ok?
That'll definitely work. It doesn't matter where the other components are except that the res is over the pump. Even that really doesn't matter except when originally filling and working air out of the loop.

also No and Yes, just as above, but you don't NEED to open the fill port, it'll just make things quicker.
 
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