This is becoming rather intriguing. Hope I can clarify some of my standpoints here. Happy to answer any questions now that you well informed guys have taken an interest and I no longer feel I'm just pissing against the wind.
I posted in the thread at PC, with an incorrect interpretation of your claim, Snutten. I apologize for any confusion.
No problems you can quote my on anything @ procooling. I've just read the thread. Coming out as an obnixious asshole just goes to show them I've been around on the internet for a while
Thanks for the link!
Now, I did conclude that each block can get more flow in parallel. I strongly suspect that getting this to occur depends on a few items (some discussed above).
First, the blocks must be the most significant restriction.
Other restrictions - think of a system with only one radiator - will become far more important when flow doubles.
I totally agree! Anything in the line where flow is double (not split) naturally increases on the resistance even more. More than double in fact!
Recommend one line for CPU and rad1, another line with GPU and rad2.
I empirically know the flow from a 1048 (peterson's leaning towards a 1048 right?) will in fact increase in both loops compared to the single original loop if it passes 2 blocks and 2 rads. And my blocks are old Innovateks. There are new blocks out there with even bigger water restriction I think, but admittedly I haven't bothered to check this up thoroughly enough to know.
rads on a 1048
Second, the pump must be relatively close to deadhead/stall with series operation. The new operating point on the P-Q curve will have >2x the flow and cannot afford to lose a lot of pressure. With the shape of a P-Q curve, this can happen only in the high-pressure/low-flow region.
Third, the pump must have relatively limited pressure capability. This provision helps ensure that the previous one applies. But while it's theoretically possible to choke a DDC to 1LPM, that's probably not going to happen in a real-world system. Low-head pumps are far more likely to benefit from parallel blocks.
With a DDC things might change. It has smaller flow and much better head. Haven't tried it out.
Bigger bad-ass (or noisy as I prefer call them) pumps not considered.
As always, it becomes a matter of overall system design. For Snutten's 2 rads and weak pump, parallel is better. For a more typical WC system with a single rad and higher pressure pump, series is probably superior.
I'm with you all the way.
I'm not questioning your results (although I've asked a friend I've loaned a 1046 to if I could "borrow it back" to try to replicate your results) but I would strongly suggest you not try to generalize from this one data point to all pumps/loops.
rads on a 1048
I'm curious as to how you were measuring flow.
Never measured the flow. It was such an obvious improvement, easily seen in my reservoir.
IMHO, there's nothing wrong with a "single rad blowing in" (so long as the rad is appropriately sized).
Yep, size is key. But keeping rads on intake, blowing into the case, raises temps for PSU, HDDs and MB. Cooling them makes noise. Or did you interpret "in" as "push" config with fan pushing through rad, never mind if it's a blow-out?
I'd also suggest avoiding any kind of claims about restriction being bad for pumps
Perhaps you're right. I'll take heed and add a "may" henceforth. Or a "probably" when feeling a bit naughty
I also kept aquariums as a hobby. Same pumps, but free flowing. They lasted for years and years, never any clanging noises. Ruined two pumps in my computer. Numerous problems reported here on SPCR. Exempli gratia (my bold):
(....)Anyway, thanks to your suggestions my (external) 1048 is now completely silent (barring a very very slight normal hum). The problem was the impeller blade, and the fact that it is loose on the the support (it can move through half a turn). Supposedly this is to allow it to pump stones (prevalent in fish tanks, the pumps main market) with snapping blades, but uneven back pressure can cause it rattle back and forth making a terrific noise.
Not having too many stones rattling around in my resertator I glued the impeller to the support and voila, the noise disappeared.
Fantastic! Silence truely is golden.