PCB vs Chip Temps

[ReadyPlayer1]

Hi All,

I have 27 antminers in a 10x11 room on one 4 shelf rack (about 6 feet across on each shelf). See photos below. I have over 6,000 CFMs coming in and going out using (4) 3,000 CFM each gable fans. I also have (2) 14,000 BTU ACs. I've hung a tarp down the middle of the room and cut out rectangle sections where the miner's exhaust goes out (the exhaust end points towards the two 3,000 CFM fans I have that takes the air out). So the tarp is meant to create a cold/hot aisle effect. Some hot air is blowing back but I'm not sure how much.

The chip temps are all OK (mostly 60s and 70s, some 80s) but the PCB on some of the miners are in low/mid 60s. I'm confused why some of these PCB temperatures are still so high. It's not high right now, but when summer comes, I'm nervous that it will get too hot.

Here are some pics:

http://i68.tinypic.com/15nrm9j.jpg

http://i68.tinypic.com/687rmh.jpg

http://i67.tinypic.com/2qmlqn9.jpg

http://i65.tinypic.com/10hkgwl.jpg

I wondering if too much of the hot air is flowing back from the 'hot' side into the cool side. I'm wondering if I even have a tarp at all

Does anyone have any experience with this or suggestions on setup?

Also, I've noticed my hash rates on some of my miners have gone up a little since I've added these new intake and exhaust gable fans. The high CFMs won't hurt the miners, right?


Moderator's note: This post was edited by frodocooper to remove inline image tags.

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[tim-bc]

60-70C is a good temperature, even for the PCB. The miners will still work with PCB temps pushing 100C.

Adding external fans was a good idea, and can only help the miners. You can always try setting your miners' fans manually to 100% or some other values to see what kind of impact it has.

[Raymond_B]

I would build a more permanent wall to separate hot and cold to eliminate any air "short circuiting", that'd probably help a lot. I'd also look at getting a bit more CFM on the exhaust side.

[ReadyPlayer1]

I would build a more permanent wall to separate hot and cold to eliminate any air "short circuiting", that'd probably help a lot. I'd also look at getting a bit more CFM on the exhaust side.

I don't want to spend a bunch more money on this - I think I might just double tarp it and get another AC unit for the summer months and blow it on the miners.

[Raymond_B]

I don't want to spend a bunch more money on this - I think I might just double tarp it and get another AC unit for the summer months and blow it on the miners.

Your statement is contradictory Then you'll be paying MORE for electricity and generating MORE waste heat...

Removing waste heat is key.


Moderator's note: This post was edited by frodocooper to remove a nested quote.

[ReadyPlayer1]

Your statement is contradictory Then you'll be paying MORE for electricity and generating MORE waste heat...

Removing waste heat is key.

I can vent the heat out from the AC units out through a hole in my room, it doesn't flow back behind the miners (it gets vented out with my dryer).

I'm also not paying for electricity


Moderator's note: This post was edited by frodocooper to remove nested quotes.

[Raymond_B]

I can vent the heat out from the AC units out through a hole in my room, it doesn't flow back behind the miners (it gets vented out with my dryer).

I'm also not paying for electricity

Is the AC unit free as well? Do you already have one? I guess in my mind some plywood, nails, and 2x4's are cheaper...


Moderator's note: This post was edited by frodocooper to remove nested quotes.

[Steamtyme]

I had a hard time figuring out a few things looking at your pictures.

Where is the exhaust going from the AC. Does this go to a completely separate room? outside? I saw a mention about it exhausting with the dryer vent. Not super important just so long as it is taken out of the equation.

You don't have to make your wall more permanent just be sure it is secure and seal up any gaps at the walls or around the machines as best you can. Some corrugated plastic would be perfect for this. you could make the cutouts row by row.

Also is it an insulated tarp you are using? They are pricier but do a great job.

The red flag for me is that you need to increase your exhausting capacity remember that the volume of air increases when it's heated. This means it's not necessarily a 1 to 1 conversion. So you may need to beef up the exhaust side. It's hard to say what the fix is, but it's nice you don't have to pay for electricity so a second AC isn't really a problem.

Also what are your ambient air temperatures and what do you expect them to be in the summer months?

[fanatic26]

Instead of that tarp you should look into using foam insulation to build your temporary wall.