Fan Layout Heatercore

[Detract]

Hey,

ive aquired a heatercore from the wreckers this morning. Its from an 80's Honda CRX and is 200mm long by 125mm wide. At the moment im not sure whether to use 92mm or 120mm fans. This is what ive come up with so far (see pic).

The yellow box is the heatercore. The red box is two 92mm fans side by side. The green box is 120mm fans side by side, and the blue boxes are two 120mm fans angled up, housed in a shroud. Which setup would you guys recommend? I'd prefer to use 120mm fans as the pull more air quieter, but it may be inefficient then i'll go for 92mm's.

http://www.theforumisdown.com/uploadfiles/0103/fan layout.JPG

Cheers

[FIZZ3]

I'd use a single 120mm fan (or one on each side of the core) and have a shroud between fan and core to channel the air properly, even if the length means a steep shroud slope.

Two 120mm's is too large IMO, and the comparison between a single 120 and 2 92's is:

200 - 120 = 80
125 - 120 = 5
total area 'wasted' = 400sq. mm

200 - 184 = 16
125 - 92 = 33
total area 'wasted' = 525sq. mm

[juliendogg]

I kinda dig the angled approach you have there, but really, if i was going to use 2 fans i would have one 120mm on either side with shrouds for a push pull, but this depends on where you will have room to put it all.


J.

[Lammy]

IMO the two angled fans should be the best performing. That setup is nice becasue each will be blowing on the other fans dead spot.

When looking at heatercores at the local automotive repair store, I have seen a heater unit with a shroud like that.... the fans were put on an angle.

Like J said, one fans on either side should work well, that configuration is probably the most common setup.

[Ven0m]

Idea is nice and your method seems to be more intresting than 1 fan on each side, but look on it from this side:
Fans produce pressure, rad gives pressure drop. Mounting one fan on each side is kind of solution for pressure problem, but it doesn't use efficiently all surface.

Your solution would use whole surface but it would deal with pressure problem.

So I have an advice but I won't tell you exactly what to do.
It depends on how restrictive to air flow is your radiator and case.
Low restriction - your soulution will be better for like 95%
High restriction - I give about 70% chance for sandwitch solution to perform better.

[Detract]

Thanks for the answers guys, still not convinced though. I should also add that Im gonna house the pump and heatercore in a box that sits on top of my case. My miditower case just wont fit it nicely. I was thinking cutting a hole in the top of the box just smaller than my heatercore and have two fans pulling air through. Is it not going matter to much that the angled fans are some distance away from the heatercore? FIZZ, im reluctant to use 92 mm fans as they dont have nearly the same CFM as 120mms, thus better performance to loudness. I guess I could look at a sandwitch, maybe 4 92mm?

Cheers

[Ven0m]

Usually pushing fans perform better than pulling if they face soem restrictions - that pressure stuff.

I'm all for 120mms if only you can run them quiet. If not - what's the point of having noisy WC set?

[Detract]

Seeing that I havn't really been covinced of either option I'm going to try all possibilties with 120mm fans. Might try to fans pulling and to pushing, overkill?

[FIZZ3]

Originally posted by Detract
FIZZ, im reluctant to use 92 mm fans as they dont have nearly the same CFM as 120mms, thus better performance to loudness. I guess I could look at a sandwitch, maybe 4 92mm?

Cheers

I suggested using one 120mm fan, comparing it to dual 92mm's and finding the 120mm's area coverage better. If you want more, as I already said, you should look into the fan sandwich idea: one 120mm on each side of the core.

[unreal]

lol,, no fans,,, grrills that is