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water and air temperature sensors placing. - Page 2

post #11 of 12
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Quote:
Originally Posted by Electrocutor View Post

You would base fan speed on (rad water out - ambient), not rad in.
- There is no reason to run the fans at all if this is 0C, even if the rad-in temp is higher.

doh.gif

stupid me, that's what I suppose to say.

Okay now to study this ambient thing.

Indeed what you are saying about the case fans, I will hook them to the rad temp outlet as well, because if this temp goes up, it means that the rad fans will pick up speed, and blow more hot air in, so the case fans must come up as well:thumb:
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post #12 of 12
Quote:
What sort of delta could you be running to possibly have that big a difference between rad in / out temps.
Air/Water Delta = (Rad Temp In + Rad Temp Out) / 2 - ((Air 1 + Air 2 + Air 3) / 3)


As for how there could be a 12C temperature difference between radiator in and out: as I mentioned, it depends on how much heat dump you have and how fast the water is flowing. In most cases and with good flow rates, the difference is not that large. You had said "You will see only very tiny differences in water temps through the loop even at full load.", I just wanted to point out that while this is the case most of the time, it depends on the variables involved, namely total heat dump and flow rate.
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