When building your loop there should be a list of things that come to mind, flow and pressure should be near the top of that list. Pressure drop is the measurement of inlet pressure minus outlet pressure, or the pressure loss of flow through the radiator.
I have the line from my wash basin in the mud room hooked up to the gate valve controlling flow, which then runs into the King flow meter. The bottom port on the flow meter is the inlet, top port is the outlet. The outlet runs down to the Delrin T which I have Bitspower 1/2″ barbs on for the normal flow, and the negative pressure line connects via an EnzoTech 1/4″ fitting. After the negative pressure T, the component in testing is attached. I always use Bitspower 1/2″ fittings, that keeps everything on a common test platform…well from a fitting perspective anyhow. At the outlet of the component is the positive pressure T fitting, again with Bitspower 1/2″ fittings and an EnzoTech 1/4″ fitting for the pressure line. The tubing the runs back into the wash basin and down the drain.
How do you like my 38mm shrouds? I was trying out a theory on the Torture Rack bench involving San Aces, which I won’t be using in the long run. Anyhow, going into pressure drop testing I was expecting to see nearly identical results to the original but ended up getting slightly different results. The original PA120.3 had pressure drop performed using my Dwyer 470-3 which met its tragic end on a Bitspower mosfet block. The Dwyer 470-3 had tighter accuracy due to a smaller range, oh yeah and it wasn’t a hydronic manometer… ah well lesson learned. To make a short story just a tad longer, I will be going back and retesting a few of the radiators again, I have already retested all the pumps originally tested with the Dwyer 470-3.
Even with the numbers being slightly (.2-.3PSI) higher, the Thermochill PA is still the King of low restriction. The PA is nearly like adding a few feet of tubing to your loop, okay maybe not that low but the numbers are just that low. The only radiator that comes close is the RX from XSPC, seems the boys from the UK have low restriction covered.
For many the data tables just don’t equate to meaningful information, so we have some charted data below with the Feser X-Changer 360 included for some comparison. Now if you want to see how the PA Series measures up against other triples, well you’ll have to see that in the Triple Radiator Comparison which will be slimmed down and updated shortly after the review goes live. The differences between the TFC 360 and the PA120.3 look a lot larger on the charts than reality, the difference at 5.0GPM is less than 1 PSI, radiators bring the lowest restriction of any component to your loops.
If you’re a regular reader of skinnee labs than you’ll notice we dropped the mH2O per LPM, which I don’t think it was of much use as LPH seems to be the most widely used and kPa is the metric standard for pressure. It seemed like redundant charting anyhow, but if you want it back let us know.
Restriction covered, lets get to those thermals… but a pit stop covering the Thermal Test Spec and Methodology. I tried just linking to my Test Spec, but a few folks got there panties in a bunch because I linked instead of including it in the page. So much for trying to save on your scrolling finger.