Cooling problems. Please Help.

[cso19]

I have 7 S9’s set up in a 10x12 room. I have two portable ac units and a fan in the room. Originally put an exhaust in the ceiling and cut some holes in the door with filters on them. It was too hot in the room 110 Fahrenheit easy.

Today I installed some shrouds and duct work off the back of each miner to get the hot straight out and not recirculate it. The room is much cooler the rack is cool the miners are not hot to the touch. However in the miner interface it is reading that they are all much hotter and now they are not hashing due to their temperature readings.

Here are some pictures of the room. What am I doing wrong.

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[cso19]

I can’t post pictures.

[Jinx3825]

You need to focus on getting the hot air out. Not necessarily cooling the room. Exactly how large was your exhaust in the ceiling? How large were the holes in your door? How thick were the filters? How big are your shrouds and ductwork? I can almost guarantee your ductwork is smaller than necessary by what you're saying. Each S9 produces around 200cfm. You say you have 7 S9's that's 1400cfm. I would recommend using 6'' hvac flex duct PER MINER and nothing less. If you don't want to print a adapter for the circular shape, the 6'' duct just so happens to fit perfectly over the fan. Keep in mind.. adding any ducting is always going to increase your temperature for the fact that you're restricting air flow. Either that, or get rid of all the piping and invest into a new more powerful exhaust fan. You could always keep the ac if you prefer. Electronics always prefer cooler air. I would be weary of condensation but that's just me.

[cso19]

I have 4 inch flex tube coming off of each miner that connects to a 4 inch Wye. All 7 eyes are connected to each other in a row and attach to a 6 inch exhaust tube that is insulated flex tube going out of the building.

[cso19]

The door has 2 square holes each 16”x25” cut in it with 2 inch filters. Usually keep the door open thoough

[Jinx3825]

All 7 eyes are connected to each other in a row and attach to a 6 inch exhaust tube that is insulated flex tube going out of the building.

There's your problem...EACH miner needs a dedicated line. 4'' is way too small also.

[fanatic26]

I have 4 inch flex tube coming off of each miner that connects to a 4 inch Wye. All 7 eyes are connected to each other in a row and attach to a 6 inch exhaust tube that is insulated flex tube going out of the building.

SO SEVEN 4" tubes all being pushed through a single 6" opening? The problem should be obvious, you dont have nearly enough flow to remove the heat. You are creating backpressure and the miners cannot exhaust properly, hence the miners overheating.

[cso19]

Its something I just had not thought of for whatever reason.

I have separated them and what i had found is as follows: it seems to work with 2 S9's exhausting into a 6 inch round duct or 1 S9 exhausting into a 4 inch round duct. That seems about the max that you can exhaust into each duct.

Thanks for all of your help and pointing out the obvious to me.

[Raymond_B]

Its something I just had not thought of for whatever reason.

I have separated them and what i had found is as follows: it seems to work with 2 S9's exhausting into a 6 inch round duct or 1 S9 exhausting into a 4 inch round duct. That seems about the max that you can exhaust into each duct.

Thanks for all of your help and pointing out the obvious to me.

I have 5 miners that I use 6" duct on. I found my S9s are basically unaffected by a 6" duct. Anything below that and they start to rise in temp (not overheat, but just a higher running temp). My S7 can get by with a 5" duct no problem. I wouldn't even think of anything lower than a 6" duct for my firebreathing M3s

I post this link a lot, I've been in your shoes. https://bitcointalk.org/index.php?topic=2796117.0