RussellMc wrote:
>>> Also, as my figures hopefully showed, you don't need much flow if
>>> water mixes fully.
>>>
>>> 42 watts per (cc per second) at 10C rise.
>>>      =20
>
>  =20
>> 10C rise seems rather high to me.
>>    =20
>
> That deep-ends on what you think is rising relative to what.
>  =20
My understanding was that by "rise" you meant Twh-Twc

>Ths  Cooled heatsink temp
What do you mean by "cooled heatsink"? do you mean the waterblock or the ra=
diator?


AIUI there are more like seven temperatures involved

Ta: the ambiant temperature arround the rad
Trad: radiator temp
Twc: water cold temp
Twh: water hot temp
Twb: waterblock temp
Tcase: IC package temp
Tcore: IC core temp

AIUI for heat from the core to flow through the watercooling system the=20
folliwing inequality must hold

 Ta < Trad < Twc < Twh < Twb < Tcase < Tcore

Now if we assume Tcore is about 70c (about as high as you want to run a=20
processor 24/7 afaict) and Ta is 30c (not unreasonable, particually if=20
the rad is being cooled by air that has already come through the PC=20
case) you have about 40c to play with for the complete cooling system.=20
Usually you try to keep Twh-Twc very low because doing so gives you more=20
headroom for Trad-Ta (which afaict is the hardest thing to reduce).
--=20
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