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Radiator Thermal Testing In Progress - Page 4

post #31 of 43
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Quote:
Originally Posted by TonyL222 View Post
Martin, I know it doesn't seem to be the focus of your test. But what struck me is that after your warm up period, the delta between "Water In" and "Water Out" appears to be much less that 1c. Further the delta seems to remain pretty constant at all heat loads.

Again it makes me question the "coolest water is leaving the rad" dogma most adhere to. While it's true in absolute terms, from your test data, it would appear to be very insignificant.
That's correct, it's very small. Most systems won't see anymore than 1C at most difference in water temperature all the way around the loop. That's one of the reasons water cools so well, it's specific heat or ability to store energy is really high.

My little sensors are only accurate to within a couple of tenths of a degree, but if I had a whole bunch of them ( and accurace down to .001C) I could actually calculate heat dissipated simply by using the in and out water temperature and flow rate and then applying the specific heat of water to calculate heat removed.

I don't trust the sensors that well, so I'm going for a water out - air in measurement that I'm after.
    
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post #32 of 43
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Still working on the PA, but these are the three trendlines I have so far. Going to try to get the slow speed yate on there just to check against my medium speed yate undervolt, then the Ultra Kazes are going on.

One thing is for sure, this testing takes a long time...

Not sure how I'm going to label this, but I'm thinking for "Great performance" you would seek for a result under 5C, 5-10C would be OK, and >10C would be poor. Any thoughts on this?

    
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post #33 of 43
Quote:
Originally Posted by Martinm210 View Post
Still working on the PA, but these are the three trendlines I have so far. Going to try to get the slow speed yate on there just to check against my medium speed yate undervolt, then the Ultra Kazes are going on.

One thing is for sure, this testing takes a long time...

Not sure how I'm going to label this, but I'm thinking for "Great performance" you would seek for a result under 5C, 5-10C would be OK, and >10C would be poor. Any thoughts on this?
I would wait until you've tested a few more before setting up a grading scale. At this point its just too arbitrary. Also, it may be better to do a test at ~150w load as well. My thinking on this is that while the rads may scale linearly between 300 and 600w, at the lower end, I'm not so sure they'll interpolate so nicely.
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post #34 of 43
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I'll throw another test in at 200W. I can set my heater up with the Kill-a-watt meter after the variac, but I can only turn it down to 200 watts. My first round of tests was including the power consumed by the variac and more than anything I wasn't letting the system warm up and settle down long enough. It needs a good 30 minutes warming up before measurements begin, then another 30 just to run the actual test for one point and ensure everything was stable and good.

From what I can tell it all scales very linearly if everything it tested right, but I'll throw another 200 watt run in there just to double check.
    
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post #35 of 43
Quote:
Originally Posted by Martinm210 View Post
I'll throw another test in at 200W. I can set my heater up with the Kill-a-watt meter after the variac, but I can only turn it down to 200 watts. My first round of tests was including the power consumed by the variac and more than anything I wasn't letting the system warm up and settle down long enough. It needs a good 30 minutes warming up before measurements begin, then another 30 just to run the actual test for one point and ensure everything was stable and good.

From what I can tell it all scales very linearly if everything it tested right, but I'll throw another 200 watt run in there just to double check.
If you don't mind. I think with all this testing it would be silly not to be properly scientific about it. But if this one does scale linearly, then I suppose you wouldn't need to bother doing the 200w with the other rads. IMHO more data points are always better, unless you already know what the curve's going too look like.
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post #36 of 43
Quote:
Originally Posted by Martinm210 View Post
Not sure how I'm going to label this, but I'm thinking for "Great performance" you would seek for a result under 5C, 5-10C would be OK, and >10C would be poor. Any thoughts on this?
that should be good for anyone who doesnt go nuts ira-k-style.
post #37 of 43
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Quote:
Originally Posted by ChielScape View Post
that should be good for anyone who doesnt go nuts ira-k-style.
Yeah, TEC doesn't apply since you're talking huge heat loads and the TEC takes care of that for you..

I was just looking for some means of giving new folks some guidance. I don't know how many times I read a "I want to cool my quad core, triple SLI, chipsets, and hard drive, do you think a double radiator is enough?" type of question.

I'm hoping with this direct read type of graph and the fans, it'll help with that. It'll also be much more obvious just how much fans affect radiator performance.

Off to putting the ear plugs back in, I've got the 136cfm 3000RPM Scythe's on board now...
    
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post #38 of 43
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One point done with the big boy fans..and playing around with formatting:

It was kind of interesting that the medium speed yates at 1350RPM performed just as well as the slow speed yates at 1414RPM...I guess that's consistent with Vapor's results too, the mediums are for whatever reason stronger, maybe in pressure by a hair.

    
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post #39 of 43
Are you able to measure the pressure across the radiator with each fan?
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post #40 of 43
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Quote:
Originally Posted by DavidNJ View Post
Are you able to measure the pressure across the radiator with each fan?
No, my manometer is not sensetive enough. If you sponsor me a Dwyer 477-000, or 00FM, I'll measure anything you want..

My manometer just isn't sensetive enough, those are extremely small pressures, and I'd have to construct a flow chamber to do that right.

Instead I'm just going to make a simple single 120mm fan duct that'll fit over the exhausting fan, and I plan to measure the actual CFM each fan is producing and have that data handy. That's all I can do with the tools and lack of funding I have now..
    
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