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2 rad, 3 sets of fans...

post #1 of 18
Thread Starter 
Hello all, I am currently in the process of adding another rad to my loop. I have a rs240 currently and am adding a rs240. I am wondering what the best fan set up is given my current set of fans. I have 2 of each of the following.

120mm NZXT fans : 1300rpm

Stock rasa fans : 1700 rpm

Yate Loons : 1650 rpm

One will be mounted in the top of my Phantom, one will pull air though the bottem of the case. The RX240 can only be mounted in the top if I only to Pull on it, the RS can be mounted with push pull. I would just like opinions on what would give me the best setup. Thanks

My original thoughts were to put the 1700 and the 1650s in push pull with the rs240 on the bottom and the rx240 with the low speed nzxt fans at the top in pull...

Also another options is to jsut to pull or push on both and put the 2 120s in the side of my case like they originally were.
post #2 of 18
Stock rasa fans : 1700 rpm

Yate Loons : 1650 rpm
    
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by microman View Post
Stock rasa fans : 1700 rpm

Yate Loons : 1650 rpm

I'm not sure what your saying here...
post #4 of 18
If you pull air through a RAD and then into another (like you have here, through bottom and out top) you're just cooling the top one with warm air from the other RAD, making it redundant, have both of them blowing out or in, either way you'll have to fight the rising of hot (or warm, rather) air. Have the front and back fans on your PHANTOM pulling cool air in and then have it being pushed out through the rads.

post #5 of 18
Thread Starter 
Quote:
Originally Posted by fr0st. View Post
If you pull air through a RAD and then into another (like you have here, through bottom and out top) you're just cooling the top one with warm air from the other RAD, making it redundant, have both of them blowing out or in, either way you'll have to fight the rising of hot (or warm, rather) air. Have the front and back fans on your PHANTOM pulling cool air in and then have it being pushed out through the rads.

I dont know if pushing air out the bottom of the case would work... wouldn't the hot air get trapped beneath the case kinda and cause some backpressure
post #6 of 18
Well you can't have a rad pulling air in only to go in another rad, I see some modding in order.

You could have the bottom rad pull in, and the side fans pull air away from that straight away, could have the back 120 (I think, been a while since I've looked at the phantom) pushing cool air into the top and can't you put a 230 on the side too?

It's quite a difficult layout for WC'ing.
post #7 of 18
Thread Starter 
I think im going to lay my bottom 240rx sideways, have the 2 120s pull air inside the case and vent it out the vent on the otherside of the case... the top rad will push/pull out the top as an exhaust... there will be some modding and hopefully I like the look when Im done.
post #8 of 18
Stacking rads shouldnt pose a big problem really, because the temps should equalize either way... Particularly if you had the outer rad take in the 'hot' and then funnel to the inner rad. either way, if there is no other choice at hand, stacking the rads would at least be better than having just the one rad. in the end it still comes down to how much air is going through how many fins with what length the cooling path is.

Saying that stacking the rads wouldnt be effective would infer that thicker rads arent better than thinner rads, which assuming best case variables is simply not true.

Please correct me if I am wrong on these points, but if I had a tj07/tj11 at my disposal I would WC using a fan>rad>fan>rad>fan pass-through in the bottom, or something similar, because it *should* be more effective than just the one rad.
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post #9 of 18
When you stack rads (fan/rad/fan/rad/fan) you are wasting money on the last rad and fans because you are essentially limiting the cooling power of the 2nd rad by passing through the hot air that is blown through the first rad into the 2nd so instead of passing through lets say 21c (70F) you are passing through 25c (77F) into water that is already about the same temp. Rads are always more efficient separate and with their own air intakes.
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post #10 of 18
Quote:
Originally Posted by Arksniper View Post
When you stack rads (fan/rad/fan/rad/fan) you are wasting money on the last rad and fans because you are essentially limiting the cooling power of the 2nd rad by passing through the hot air that is blown through the first rad into the 2nd so instead of passing through lets say 21c (70F) you are passing through 25c (77F) into water that is already about the same temp. Rads are always more efficient separate and with their own air intakes.
but would that not be extremely contingent on how much heat is transferred on a pass? you must admit that a slim 120 rad would yield such a low heat transfer that stacking another slim 120 would still be effectual? especially if you were going for a quiet setup using low fpi rads and low fpi fans, you could stack to increase the surface area for dissipation, increasing the length of the cooling path, not to mention that the extra set of fans would allow lower speeds to accomplish similar results to a louder setup no?
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