BFL Single air flow? - page 4. | Bitcointalksearch.org

eestimees

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Quote from: rupy on September 02, 2013, 07:29:39 AM

I think the best solution for sound here is remove the case and all fans, then place 2 singles next to eachother and put one big fan on top that covers all 4 heatsinks. Also why are all top mounted fans blowing DOWN?? Heat naturally goes UP!!

you are joking, right? to cool them with one fan, it has to be a powerful and I doubt that it would be a quiet one, as the needed airflow (CPM) is a lot...

my main concern with this topic was, IMHO those fans inside case are working against each-other, I mean on the picture the left fan do not get much free air to blow down as the fan on the right has taken most of the incoming cool air away..

rupy

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I think the best solution for sound here is remove the case and all fans, then place 2 singles next to eachother and put one big fan on top that covers all 4 heatsinks. Also why are all top mounted fans blowing DOWN?? Heat naturally goes UP!!

eestimees

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ok, thanks!

dogie

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Quote from: eestimees on September 02, 2013, 07:13:21 AM

yes but when one has that blue airflow bracket, then the flow is forced to the sink and there would be a single continuous and effective air flow through the single (of-course case close not in open air) ...? that should be much quieter also.. in the original design air has multiple obstacles/high and low pressure points and different direction airflows collide.. all that is noisy and ineffective IMHO.

It would be inefficient, but not noisy. Get two case fans and hold them far apart and together, doesn't make much difference.

I didn't realise you had that as a bracket, but the design still doesn't work. You can't make an air tight seal around the heatsink, and so the air will still rather go around than through. There is a lot of flow resistance associated with high surface area.

eestimees

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yes but when one has that blue airflow bracket, then the flow is forced to the sink and there would be a single continuous and effective air flow through the single (of-course case close not in open air) ...? that should be much quieter also.. in the original design air has multiple obstacles/high and low pressure points and different direction airflows collide.. all that is noisy and ineffective IMHO.

dogie

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Yes they are. Without the small ones blowing directly through the fins, the majority of the air would just find the path of least resistance, which is around the sides of the heatsinks.

Arguably in an open case the two larger fans aren't required, but we don't know for sure the cooling requirements on the non-chip components.

eestimees

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Hi,

I've been looking at those single pictures (don't have one my own) and read about those whinigs about noise level... I was wondering are those two small fan's really nessesary ? I've made a drawing as I _think_ air flow goes.. and would be much quieter (if you replace those side plates):

I'm I wrong?

Topic: BFL Single air flow? - page 4. (Read 6919 times)