Z9 Mini Dual Fan

[Lypus]

I changed for testing  one of my Z9 mini to dual fan.
https://image.ibb.co/gQhXXp/mini_edit.jpg

Maybe later I will cut a big whole in the backplate.
https://preview.ibb.co/my7hXp/IMG_20180828_190527_HHT.jpg

Stats of the dualfan Z9 mini
https://image.ibb.co/cF1ZCp/mini1.jpg

Stats of the normal Z9 mini
https://image.ibb.co/jEPXyU/mini_2.jpg

EDIT
Some thoughts, the big advantage is that the miner have now enough power to push the Air out. My problem is that there is no good way to install the hose. Does anybody know where to get a backplate with screws for the other side.

The hose (I'm not sure about the right word in english)
https://preview.ibb.co/kNWFk9/IMG_20180828_200519_HHT.jpg

[Sebahl]

What kind of fan did you use? Did the noise level decrease?

[Lypus]

QFR1212GHE, about the noise level I can't say anythin because the miners stand next to each other. After one day testing I will change the second one.

[Sebahl]

How did you mount the fan?

[Lypus]

I used rubber screws made for fans.
https://preview.ibb.co/ghLi59/IMG_20180828_201031_HHT.jpg

Maybe I will change all screws later.

[imine2]

Hi,
New member!
Don't have a screencapture yet!

These are my findngs:

I voided my guarantee and removed the backplate (with small holes) completely !!!

Doing 750 MHz with original fan in auto-mode.
Doing an avarage of 16.28 KSol/s.
My ambient room temp about 23-26 Celsius depending sunny or not (+ summer).
My temp (PCB) 49-53 C and temp (Chip) 63-67 C.
Fan speed normaly between 3600 - 3720 rpm.

If anyone of you already voided your guarantee like me perhaps you could try doing what I have done and for everyone else confirm / dismiss my findings.


Just sharing own experiences !

[Lypus]

I mentioned it tonight, the second fan makes the miner a lot louder (removed it tonight for better sleep). I will make another try with a hose and a sonodec.

@imine2
I removed the backplate before to clean the miner, but I do not like to run the miner completly open.

[kahc]

I changed for testing  one of my Z9 mini to dual fan.
https://image.ibb.co/gQhXXp/mini_edit.jpg

Maybe later I will cut a big whole in the backplate.
https://preview.ibb.co/my7hXp/IMG_20180828_190527_HHT.jpg

Stats of the dualfan Z9 mini
https://image.ibb.co/cF1ZCp/mini1.jpg

Stats of the normal Z9 mini
https://image.ibb.co/jEPXyU/mini_2.jpg

EDIT
Some thoughts, the big advantage is that the miner have now enough power to push the Air out. My problem is that there is no good way to install the hose. Does anybody know where to get a backplate with screws for the other side.

The hose (I'm not sure about the right word in english)
https://preview.ibb.co/kNWFk9/IMG_20180828_200519_HHT.jpg

I couldn't get a hold of the backplate either, I asked around local mechanical workshops, all quoted me $200++ for making such plate in aluminium.
If you know someone with access to a CNC then maybe you can get it done for a reasonable price.


In my case, I 3D modelled a fan mounting bracket( aka cowl) and got it printed locally ( 3dhubs.com), it costed about $15.
The cowl is attached to the backside of the antminer with duct-tape.
The hose you are referring to is called a duct, sonodec on the other hand is a hose.
The duct is attached to the fan, and the fan to the cowl. M4 screws, nuts and washers can be obtained locally.

So my setup goes like this:
flexible hose -> duct -> exhaust fan -> cowl -> Z9 mini -> intake fan


I can upload some pictures later once I get home.

[fanatic26_]

What exactly is the purpose of adding a second fan other than wasting electricity? Even overclocked these things pull a hair over 400 watts and dont put much heat out at all.

I dont get it?

[shater]

Can you please post the temperatures and noise level (dB) here? Would be curious to see how much dual-fans actually help

[Sebahl]

I am curious if you can reduce the speed of the fans when using 2 and keep the temps low? That would reduce the noise level.

[kahc]

What exactly is the purpose of adding a second fan other than wasting electricity? Even overclocked these things pull a hair over 400 watts and dont put much heat out at all.

I dont get it?

Depends on your setup and where you keep the Antminer(s).
The main reasons for me are heat extraction and noise reduction because I live in a one-room apartment running several Antminers in soundproof boxes.

If you attach a hose to Z9 mini without an extra exhaust fan, the intake fan would have to run at max fan speed most of the time to be able to keep the Temp(Chip) under 85.

[fanatic26_]

Depends on your setup and where you keep the Antminer(s).
The main reasons for me are heat extraction and noise reduction because I live in a one-room apartment running several Antminers in soundproof boxes.

If you attach a hose to Z9 mini without an extra exhaust fan, the intake fan would have to run at max fan speed most of the time to be able to keep the Temp(Chip) under 85.

Ahh, I always forget people try and run industrial mining equipment in places where they really shouldnt lol

[kahc]

Depends on your setup and where you keep the Antminer(s).
The main reasons for me are heat extraction and noise reduction because I live in a one-room apartment running several Antminers in soundproof boxes.

If you attach a hose to Z9 mini without an extra exhaust fan, the intake fan would have to run at max fan speed most of the time to be able to keep the Temp(Chip) under 85.

Ahh, I always forget people try and run industrial mining equipment in places where they really shouldnt lol

Hehehe just a man on the street trying to make a living.
The upside is that they run no more noisier than GPUs now, I can actually sleep without earplugs.

[starmax]

So I tried adding a 2nd fan to my Mini (Delta QFR1212GHE) yesterday, but man it was way to loud.  I found that moving the fan about 1 inch away from the backplate reduced the noise a lot, which I think means most of the noise is turbulence.  Even with that, the point of creating a push/pull fan setup is to either cool better at the same noise level or cool the same with reduced noise level.  I'm not really seeing that with these industrial fans.  Removing the backplate completely should help but not sure I want to void my warranty yet.  Also need a way to mount it if the backplate is removed.  Anyone else try this?

[Oakey22]

Watching this with interest, the z9 mini is one loud machine so anything to make it quieter is a god send.

[efudd]

Watching this with interest, the z9 mini is one loud machine so anything to make it quieter is a god send.

Try the S9... Z9 is a dream by comparison. ;-)

-j

[lunobird]

I would probably recommend running an exhaust fan not on the miner itself but rather on the soundbox is better. You can run inline pipe fans and that helps to lower the antminer fan speed and draws out the air from the miner. However you will get added sound from the exhaust inline fan but they are good at pulling out large volume of air and less high pitch more deeper lower pitch noise

[kahc]

Watching this with interest, the z9 mini is one loud machine so anything to make it quieter is a god send.

Try the S9... Z9 is a dream by comparison. ;-)

-j

Saw your neat setup with the tent in another thread.
Wondering what noise level you get.

[efudd]

Watching this with interest, the z9 mini is one loud machine so anything to make it quieter is a god send.

Try the S9... Z9 is a dream by comparison. ;-)

-j

Saw your neat setup with the tent in another thread.
Wondering what noise level you get.

It's still loud, to be honest. ~80db outside of the tent. I figured 'sound isolation' would be another project at some point. The tent isolated it enough that they can't be heard throughout the house and no one flips out if I leave the door to that room open.

It's loud enough that i can't use open ear headphones in that room.. and closed ear is questionable. :/

-j