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Do we need to fill up the res? - Page 2

post #11 of 16
Quote:
Originally Posted by rubix_1011 View Post
Just make sure it isn't 100% full with the res cap off...starting and stopping a pump when that full will turn your res into a miniature old faithful.

Actually it is only stopping the pump, if full while running. Running the pump causes the water level to drop.

Water doesn't expand that much. The coolant does not change temperature *that* much to noticeably effect water level on temp alone....if it does it is because your pump failed...and then water level is the least of your problems.
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post #12 of 16
Right, when a res is full and uncapped, it's not a good idea to be power cycling your pump...yeah, when it kicks on, the res will drop a little. When you shut it off, it will purge out.

I was trying to keep it as simple as possible.

And no, I don't entirely agree on heat expansion of water; that would involve it actually vaporizing and creating gas expansion, such as in a car radiator...we don't see temps like this in watercooling.
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post #13 of 16
I'm pretty sure even 10c (most wc setups' delta) doesn't make the water expand that much
 
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post #14 of 16
^Right, esp. given that delta being based off room temperatures; unless your home-office is located in the 7th realm of hell.

To some, it might appear so; however in a more figurative way.
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post #15 of 16
Quote:
Originally Posted by rubix_1011 View Post
And no, I don't entirely agree on heat expansion of water; that would involve it actually vaporizing and creating gas expansion, such as in a car radiator...we don't see temps like this in watercooling.
The liquid itself expands as it is heated, no vaporization required.
It wouldn't be much expansion at the temperatures found in a WC setup, but if the closed system is 100% filled with water, even a very small change in volume could cause serious issues.

I doubt many people ever actually get a loop together that is 100% filled with liquid, and the flexible tubing would give a little bit of a buffer against developing really high pressures, but I strongly recommend intentionally leaving some room in the top of the reservoir.

Things I've seen in my work, and a handful of garage experiments, have infused me with a healthy respect for what expanding liquids can do to a non expanding container, even ones that have burst pressures rated in the thousands, or tens of thousands of psi.
Edited by Caleal - 3/29/11 at 1:41pm
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post #16 of 16

I'd fill it up 3/4 of the way. As long as bubble are not being sucked out of the outlet port then you're good.

Here's an example that I'd say to put more in as you can see the air bubbles almost making it all the way to the bottom.

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