Not so Good News for brandon and the Iwaki WMD30RZT:(

[MaxxxRacer]

Well for all of those who are interested in using an Iwaki WMD30RZT I have some bad news. this thing dumps heat like there is no tommorow. My calculations show the heat dump to be a staggering 46.446watts. the test was run over a 1 hour period. well 1 hour and 2 minutes to be exact. the water temp went from 68.4F to 84.6F.

another tidbit of info here. after an hour or so the pumps case temp reads an astounding 82.78C!

to compare the WMD20RLT i have dumps 14.45watts based on the same test here.

through all of this there is SOME good knews. based on the pressure testing which showed with the RBX and maze4 (aluminum topped one) my flowrate was roughly 4gpm at 18.567ft of head!

here are some complimentary pictures. Brandon i was gonna get a video with some sound of this wierd sound the pump was making at first but it stopped before i could get the video going. its been running for over an hour since then without issue.


EDIT: I let it run for another hour for fun to see what would happen and the water temp is at 100F and the calculatiosn show around 40 watts of heat dump. im guessing its lower now due to the high heat differnetial. based on newtons law of heating, the higher the dT the faster heat will move. so the warmer the water gets the more heat it will loose through the insulation and the worse the reading.

anyway its time to stop running the pump as i dont want to boil water here.

[Brandon_Tyler]

Damnit MaxxxRacer this wasnt good news to wake up to. Oh well it only cost me 80 bucks.

-Brandon

[MaxxxRacer]

ya its not so bad. i will post the pics now and the pump case temp.

[Pessimisten]

Still bad at 50hz,MD version and a Monstercore?

[MaxxxRacer]

50hz is worse. the heat output is almost the same with noticeable performance difference. but i still think this pump might be usable with a monstercore. I know cathar used one with dual 302's (i think they were 302's. they might have been 192's) and this temps were pretty good..

[Cathar]

Yeah, my MD30RZ (not WMD) at 50Hz was dumping around 49-51W or so into the loop. Quite a staggering amount.

I was using twin Camry cores (effectively a Thermochill 120.2 each core) and they were still unable to handle the heat dump with respect to the CPU being warmer due to warmer temps because of the pump's heat.

Avoid the MD30's. The MD20R(Z) is the strongest pump from the Iwaki range that most anyone would want to use.

[Pessimisten]

Yeah, my MD30RZ (not WMD) at 50Hz was dumping around 49-51W or so into the loop. Quite a staggering amount.

I was using twin Camry cores (effectively a Thermochill 120.2 each core) and they were still unable to handle the heat dump with respect to the CPU being warmer due to warmer temps because of the pump's heat.

Avoid the MD30's. The MD20R(Z) is the strongest pump from the Iwaki range that most anyone would want to use.

Now I have to get me a MD20RZ and sell my MD30RZ

[MaxxxRacer]

Its a pitty as the pump is amazingly powerful.

[Brandon_Tyler]

Hmm I guess its time to reinvest in either a Panworld, or the smaller Iwaki.

[Special_K]

or start selling tea using the 30RZT to boil the water =p

[Brandon_Tyler]

or start selling tea using the 30RZT to boil the water =p

Mmmmm good idea. NOT! Anyone want to buy a 115 volt portable water heater/pump.

[IYP]

lol...hmmm...watercool the watercooling pump!

[Holst]

Thats quite a hefty heat dump ..

BUT if you have a big rad you should easily be able to cope with a 50watt increase in load.

Can you give any approx numbers on CPU temp drop vs water temp increase max...
Would make for an interesting comparison.

The higher flowrate with a inpingement block might cancel out the water tmep increase.

Is this pump also noisy?

[freecableguy]

Its a pitty as the pump is amazingly powerful.

Hmmm....might there be a link between pumping power and heat dump?

[jinu117]

Thats quite a hefty heat dump ..

BUT if you have a big rad you should easily be able to cope with a 50watt increase in load.

Can you give any approx numbers on CPU temp drop vs water temp increase max...
Would make for an interesting comparison.

The higher flowrate with a inpingement block might cancel out the water tmep increase.

Is this pump also noisy?

That is like another GPU on top of typical loop. Maybe if you have SLI to cool, additional 50watt vs restriction may cancel out on monster core.... but than, I don't really know if you want to put all those components in together which is not exactly cheap to get the performance which probably can be obtained cheaper using multi loop, etc. Maybe this will be good choice for peltier cooling crowd though. Additional 50W can't be too much on that scenario... like what... 5-10% of total heat output? :P

[Holst]

My point being that I can cool a pelt rig (500watts+) using only my dual heatercore with powerfull fans.

Im pretty sure that you guys with 120X3 rads can probably manage an extra 50watts with only 1*c increase in water temp, maybe less.

You may get 1*c lower temps due to the increased flow, maybe..

You might even be able to reduce this further by heatsinking and fanning the pump itself.

[CrimeDog]

can you try putting a little airflow over the pump?

[Brandon_Tyler]

You guys are CRAZY I might try to hook it up just for giggles once I get it back from Maxxx. maybe if took both my caprice rads in series. with my maze4 and 6002 AHAHHAHAHHHA **evil**laugh.

B!

[phextwin]

Is this pump also noisy?

Once isolated it is reletivly quiet (say mcp600 levels IIRC). Somwhat of a rumbling - not annoying at all IMO.

Hmmm....might there be a link between pumping power and heat dump?

More powerfull pumps have more powerfull motors.

But anyway, nice results Maxx, pretty much bang on what is written on the case of it (45W). Nice to see it confirmed

[charlie]

try watercooling your pump motor



P-H-A-S-E C-H-A-N-G-E

C

[RaptorRaider]

the heat output is almost the same with noticeable performance difference

Any proof for this at all?


I know Iwaki gives the same 'Power Output'-values for both 50Hz and 60Hz, but for me it's still hard to imagine that simply raising 'Hz' increases power but not heat dump.

[Holst]

The more water the pump moves, the more heat goes into the water...

Moving water has kinetic energy, this is converted into heat through friction, this MUST go into the water.

So unless the pump manages to be more efficent at 60hz than at 50hz the power ratings must be a bit wrong (or the flowrates)

The accuracy of the numbers manufacturers supply are probably a bit dubious anyway.
Having found out how a fairly well known heatsink manufacturers test and validate fan specs and heatsink C/W ratings. (IE - very innacuratley indeed) it would not supprise me at all if other manufactuers specs are a bit wayward.

[Craig]

If you set it up in a exterior case in which the components are arranged so that the air flow from the monster core's 4 fans washes over the pump........

And perhaps add some heat sinks as someone else suggested to the pump it's self.....

Could tip the balance perhaps? Worth a shot before selling it I'd think....... As Holst points out, if it's possible to cool a 500W TEC'd rigs heat load with approx. 1C rise, then this should be workable as well. Fan noise may become another issue however in this approach although with the monster core and 4 fans you'd have a lot more surface area than a single dual fan rad so should be able to use a bit calmer fans........

I'd suggest you use a differant block than that Swifty 6002, the 6002 is geared toward lower flowing rigs. A TDX would be good, or perhaps the new Swifty Storm block. A overly restrictive block like the 6002 will compound the problem of the big pump by making it work even harder.

Best of luck with that beastie! Let us know how your testing in a actual rig goes.

[STEvil]

well, if you dont want it I might.

[Holst]

You will have to use the right block to take advantage of the extra head/flow.

I think a swifty G4 is the way to go... but max will probably know more about this than me as ive not used any of these newer blocks.