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"After PC Shutdown, Water Cooling Continues..." - Page 3

post #21 of 36
Thread Starter 
You're refering to "thermo-syphons" which require rather low flow resistance to work correctly.

The only real world performance application was two-stroke single cylinder trials & road racing motorcycles of the 50's & 60's - true thermo-syphon cooling systems, but unable to maintain cylinder head operating temp if combustion temperature suddenly increased (lean burn condition).

Coolant flow rates in pc systems must be moderately high to quite high when aggressively oc'g or fans are simply blasting away - thermo-syphon flow rate (no pump / pc system) is low due to multiple water blocks & radiator design - coolant temp rise quite rapid even if fan(s) are run max rpm.

Actually the most successful application of the thermo-syphon principle is the present day "cross flow" automobile water radiator - water already cooled in radiator develops increased density and settles to "bottom" of radiator assisting water pump flow.
Edited by buildtoexcess - 3/30/12 at 5:47am
post #22 of 36
im sorry but it just wont matter..... if you properly shut down your chip will unload most if not all load before it turns off the fans/pump. To test this its easy just load your pc, then suddenly unload it to as small as possibly and watch how quickly it cools down.... you can also use an external temp probe to mesuare the temps after a shutdown. you may find that 1 or 2 degrees above ambient may hold true for a bit but its nothing to worry about... these chips can run at 85 with no worries im sure even if it holds in the mid 40's (very unlikely) its not an issue.

HOWEVER if you truely wish to waste your money away a simple 12v 2amp power supply woiuld work jsut fine.. like the kind you plug into the wall to charge your phone....
post #23 of 36
If I've been load testing and the CPU temps hit, say 60ºC, as soon as I stop load testing the temps drop down to a few degrees above the 'normal' idle temps in less than a second before gradually reaching 'normal' idle temps within a few minutes. Can't see the point of keeping the pump running.
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post #24 of 36
I think I have a cheaper (though slightly less elegant) solution for you. Just hook your second PSU up to this and pop one of these in-line running from your main PSU to the 4-pin plug on the Add2PSU adapter. That should tell the adapter that the main PSU is on for about 5 minutes longer than it actually is, which will keep your second PSU running the pump and fans for an additional 5 minutes after you turn your computer off. thumb.gif
post #25 of 36
Chips are thrown in ovens to be soldered to boards. A tiny spike in temperature when they are not running isn't going to kill them. Even if the water isn't being pumped it will still move in the presence of heat (convection). If this was such a problem there would have been systems in place to keep fans power on, for years now. This keeping the computer cooling on after shutdown is the same gimmicky deal as turbo timers.
 
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post #26 of 36
Thread Starter 
Thank you, Cory, this is interesting approach - my main psu is Corsair AX-850 (Seasonic production w/Corsair sourced cabling) and is v. quiet.

I would add Seasonic X-400 Fanless using Add2Psu adapter - all fans, all pumps, all system related cooling devices dedicated to X-400 psu.

The only thing missing is longer timeout - let me think about this approach.

To answer expected comments, X-400 is smallest quality build fanless psu available and "yes" it is larger than necessary for fans + pumps but is reliable psu.
post #27 of 36
I could be wrong, but I believe the Extended Cooling things function mostly as capacitors, so if you daisy-chain several of them, it would probably extend the post-shutdown running time almost multiplicatively.
post #28 of 36
Thread Starter 
Ramicio, as it happens, my dd has a turbo motor and I use a recognized quality full syn engine oil, change oil more frequently, always idle engine after parking and listen for after run of aux water pump & rad fans - otherwise engine oil will sludge in hot wheel shaft bearing. I do not run "turbo timer" because my auto insurance provider will disqualify my policy in event of car theft. I live in hot high density urban environment w/frequent stop-n-go traffic conditions - max heatsoak conditions.

performing surface mount component/chip mounting of "unpowered" chips is not the same level of thermal stressing as operating voltages applied to functioning chips.
post #29 of 36
Quote:
Originally Posted by buildtoexcess View Post

performing surface mount component/chip mounting of "unpowered" chips is not the same level of thermal stressing as operating voltages applied to functioning chips.

Ordinary cars with engine-operated water pumps and fans that shut off when the car is shut off aren't massively suffering from oil coking. It's an overboard problem. It's also a problem that does not apply to water-cooled turbos, neither. Your right foot is what controls the turbo spinning, not traffic conditions. Turbo timers are one example of a gimmicky product sold to the public without any kind of scientific proof of a problem in the first place. They're along the lines of $1,000 audiophile cables.

Apples to oranges on the chip soldering comparison. These thermal "stresses" you talk about ARE after the chip is powered off. And we're only talking about a few degrees here, and not an instant spike in temperature. I hope one also realizes that forced quick cooling is pretty stressful on any material.

The cheapest option is a battery, a 555 timer circuit, some diodes, and some relays, if anyone is so adamant about keeping cooling running after a computer is shut off.
 
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post #30 of 36
"Forced quick cooling" doesn't apply in this scenario, since the ultimate goal is to consistently keep the components at (or as close as possible to) room temperature. When your computer has been off for a time, turning it on will start warming up the components, but will also activate the cooling system simultaneously. No forced quick cooling there. Then, if the OP is able to implement his idea, his cooling system will stay active for a period AFTER the components are no longer actively generating waste heat, helping them to return to room temperature much quicker. Again, no forced quick cooling, so I'm really not sure what you're talking about with that... not trying to be confrontational or anything, I'm genuinely trying to understand what you mean by that. Although, you are absolutely correct in that ANY sudden and extreme temperature fluctuations will stress the component.
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