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"After PC Shutdown, Water Cooling Continues..."

post #1 of 36
Thread Starter 
I will operate MCP35x2 dual pump + radiator fans on separate 12vDC supply.

I want pump(s) + radiator fan(s) to continue to circulate/cool system water block(s) "AFTER" I shutdown pc -- post-shutdown run-on than ended/hard shutdown of pump & fans to be controlled by timer. Timer will permit 15-20 minute operation.

I am doing this to minimise thermal spiking/stressing of the expensive bits.

Question: Does anyone know of a "controller" that connects to a mobo fan header for signal, plus separate 12vDC pwr input, plus adjustable timer? This is largely a relay box + connector sockets + adjustable timer circuit -- I can build up from components if necessary, buying off-shelf is simply easier.

Thanks for your comments
post #2 of 36
Quote:
Originally Posted by buildtoexcess View Post

I am doing this to minimise thermal spiking/stressing of the expensive bits.

I don't really see any need for this really. Temps won't be spiking if the computer is off so whatever temp the parts are at when you shut the computer down will only go down until they eventually reach room temp - even without additional cooling post-shutdown.
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post #3 of 36
Would it be easier to go off the pins that connect to the front panel power button instead? I would think the fan headers are worthless after the thing is shut off.
post #4 of 36
Thread Starter 
Actually the thermal interface of each water block will +deltaT when coolant flow stops/system shutdown occurs, for several minutes or longer, depending on final maxT of chip interface.

I have also looked into simply continuing case fan(s) operation after system shutdown, but not as effective.
post #5 of 36
You could always get a bay psu like this and connect the water cooling pump and fans to it. It wouldn't automatically shut off but I'm sure there's a way to rig that up.
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post #6 of 36
Thread Starter 
gm88, yes this is another way, I was thinking that mobo fan header, can be used to hold 12vDC relay "open" during pc operation, followed by mobo header @ 0.0vDC resulting in "closed" relay contacts after pc shutdown.

thanks
post #7 of 36
Thread Starter 
s.e. thanks I'll look at this approach tonight - I prefer DC circuit timers inside pc - I will check whether bay pwr unit uses mains AC 110/240 input or has isolated external pwr brick
post #8 of 36
They usually have a cable that runs down from the 5.25" bay to one of the expansion bay (PCI) brackets with a cable to plug from the wall to that bracket.
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post #9 of 36
what do u want to tern the pc of when its under full load??

as my system is idle for 5 to 8min the loop is back to room temp

so if u just let the system idle be for u shot down there ant any problem
as any heat that is in the block will disapait into the still water
post #10 of 36
Quote:
Originally Posted by buildtoexcess View Post

Actually the thermal interface of each water block will +deltaT when coolant flow stops/system shutdown occurs, for several minutes or longer, depending on final maxT of chip interface.
I have also looked into simply continuing case fan(s) operation after system shutdown, but not as effective.

How do you know about this? It just seems very unlogical that chip temperature will increase after system shut-down. And i dont think heat matters much when there is no current flowing through your components.
I think it's a waste of money to let it run longer.
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