Thank you for mentioning this...I had little clue about it. But to tell you more about it...I am not planning on changing the fans to reduce the noise. I was originally planning below:
1) Install 32 antminers on a 8Ft X 2FT X 6 FT rack and
2) Put the racks back to back to create a hot tunnel. Leave 30 inch of distance between the two racks for the hot tunnel.
3) Put drywall on the back of the rack (Question for the experts: Is Drywall a good idea?) so only the hot air will go through the fans in the hot tunnel and hopefully there won't be any hot air leaks
4) Put fans on the top of the hot tunnel to suck out the hot air.
CHALLENGE: Now the issue or more so confusion is how much CFM exhaust should I put for the exhaust? I will have total of 2 racks on one side and 2 racks on the other so total of 4 racks and 128 miners on them in total. So that is the reason why I was asking about the CFM rating so I can figure out the exhaust...Am I even thinking right? I thought that if each exhaust is 250CFM then 250*128= 32000 so I need atleast 35000 CFM. Is there anything like more exhaust then needed? And for the intake I was planning on keeping 30000 to maintain a negative static pressure in the suction i.e. on the exhaust side
Does this design have any teeth to it? Am I even thinking in the right direction? Should I be careful about anything?
P.S. Thanks to everyone who has contributed to the post so far....
Very good! Yes you are thinking right. What you are setting up is called 'hot-aisle/cold-aisle' and is the most common way of controlling and routing airflow in data centers. Ja figuring 250CFM per miner is a good ballpark to base total airflow needed in worst-case incoming air temps. Use multiple fans preferably with speed controls to throttle them as the conditions dictate.
As long as the incoming air temp is around 95F or less they can tolerate very high exhaust side temps of around 120F so as long as enough air is moved to get that heat out you are good.
Hardest part of you plans will be getting the miners themselves as supply is very tight from both Bitmain and Canaan (Avalons).
Mine on Dude!
When doing temp rise calcs keep in mine that every kw of miner power = 3,412.14 BTU of heat.
This isn't necessarily what the thread is about, but I've got an idea about heating/ventilation that I may be implementing when I start mining in October.
I plan to use two racks side by side (not back to back) to put the miners on. I'll put an insulated tarp on the back of the two racks and cut holes in it for the exhaust fans of the miners (should work better than drywall as BitcoinIntern suggested). From there I'll put two "poles" up vertical to each end of the rack, creating the frame for a small square "room". Then I'll fasten more of the insulated tarps from the pole to one end of the rack on each side, and then a tarp over the top. This should effectively create a small insulated room which you could then place an industrial portable AC in front of which would shoot cold air into the room for the miners to suck up.
It's difficult to picture but imagine a small room with a bunch of holes cut out of the back, and one hole cut out of the front to stick the AC output into. The exhaust of all of the miners can be ventilated out of the room without ever recirculating back into the miners intake, or heating the air up that the miners will be sucking in. I'm thinking that even if the room the miners were in is 100 degrees, with the insulated tarps and an industrial portable AC creating positive air pressure in the makeshift room, the miners should run as if it were only 70 degrees out, which would be extremely cost efficient. Another note, I wouldn't consider the AC and would simply use outside air as intake to the small room, but I live in Florida, so sucking in 90 degree air would be a bad idea. Let me know what you guys think.