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Originally Posted by jaydee116
Correct me if I am wrong, but the shunt resistor is not a heating device. It is used to measure the current.
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Yep.
Not sure how that got mixed up.
The shunt is something that you want to plug in series, between the PSU and the heater cartridge. The shunt, if calibrated properly, will give you a proportional but very small voltage reading, usually in the range of 0 to 50 mV (millivolt). It's that measurement that you use to quantify the current that goes to the heater.
Assuming that you also have the voltage measurement (at the cartridge), you apply:
P = V * I
where I is current, and V is voltage.
Nice and simple, no?
I'm glad that you see the pressure drop issue.
Check out this setup, by Joe Citarella (
www.overclockers.com, a WBTA member):
http://overclockers.com/articles750/
That setup is quite expensive, but the expensive parts are the air nozzles, because they're the calibrated parts that allow one to measure actual airflow (i.e. if you know the dP, you can calculate the air flow rate).
The setup has flow straighteners, in and out (easily replicated). The pressure gauges are simple manometers.
I'm sure that you're thinking about using the same fan for each rad that you're testing, but you really ought to make sure that your airflow is going to be the same, and to do that, you ought to consider measuring it.