I asked the question about Delta-T going through the rad in another thread -
HERE
The answers I got in that thread confirmed my recollection that air sucked through a radiator will only go up a maximum of 1-2 degrees. If one has decent airflow, the Delta-T will probably be well under a degree.
Now it might be possible that raising the incoming air temperature a couple of degrees above ambient could screw things up, but I have a hard time believing it.
I don't know just where the notion that the air coming off a WC rad is so hot that it must be kept out of the rest of the case came from, but it appears wrong to me.
I did see several comments about being sure to duct the rad air out of the case in some of Joe's early articles on the site. But these articles date back to the days when, by his own admission, he knew alot less on the subject, and may not have had the numbers on how little the temps really changed. (plus many of his boxes were running pelts, doing heavy OCs or had other cooling loads which gave him a bigger Delta T)
I think many people might also see 'heater core' and start thinking in terms of their car heater experiences; forgetting that there are much higher temps in an automobile than they are in a WC circuit. I know that was my initial reaction, and I was surprised when I found the number was as low as it is.
I don't see ANY other advantage to ducting the rad out of the case, and considerable disadvantage. So why NOT use it for cooling? Bear in mind that I'm going to be WCing all the major heat producers in the case, so I shouldn't get the big increase in temp on the way through the case that the air cooled guys do. Frankly, I'll be surprised to see as much as a 10* increase from the case intake to the case exhaust. (except the PSU, which is exhausting nearly all of it's heat outside the case.
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shiltz: i'm using a BIX 2 rad in my current system which is about the same size as the heatercore you said you were gona use and i'm using a YY cube case, what I did that works really well is I mounted the rad flat on the bottom rear of the case on the drive side sucking air from under the case since it stands up on casters and then exausting it out the rear of the case. I did it that way as the idea of sucking air from the front and blowing the hot air into the case effecting the heat on anything not watercooled didn't sound to effective to me nor did mounting it on the back/top and pulling warm air from inside the case sound to effective either.
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See my note on the temperature change, and ask why it's a worry...
However your idea doesn't sound bad except that I don't like the flow direction you're using. It reminds me of a tale I heard several years back about some main-frame designers debating airflow direction. There were several 'pull from the bottom' advocates who changed their views when one opposed to the idea mentioned his broken english conversation with a new immigrant cleaning lady who told him how easy it was to clean the computer room because the dirt 'just disappear' when she swept it under the machines...
It might be OK to pull from the underside IF one is using (and regularly cleaning!) a good air filter, but I think you'd have better results to reverse the fan so you are sucking from the back and blowing through the rad out the bottom. Even doing that, I'd still use a filter. Remember that a rad full of dust bunnies isn't going to cool very well! (and rads are hard to clean...)
I did consider doing an exhaust duct out the bottom, which would be possible in my case, and appeals to me more than a side duct. I decided against it because it would still leave me with the problem of having to add additional intake fans and finding room for them.
Gooserider