Quote from: yianni on July 11, 2018, 12:36:03 AM

Quote from: ssaleen on July 06, 2018, 08:38:12 PM

Hello Guys,

I have a 126 GPU farm that was cooled by 5 split ac's 2 ton each (total 10 ton capacity). I recently added 13 antminer s9i and the following is what happened

1. Without a room for the antminers the ambient temperature for the mining room became 41 degree celsius with all 5 ac's on.
2. The room that i use for mining is 8m x 5m x 3.8m (LxWxH)
3. outside temperature reach to 47 degrees in UAE
4. Fresh air intake without cooling wont work.
5. my dream is to turn off all ac's

My attempt to resolve the problem is as follows

-I built a room (Hot isle) for the antminers that included a window (I just put partition from gipson board on the back of the rack and the back wall is a window. I also put a gibson board on the back of the rack with holes for the 120cm exhaust fans and sealed it. However the exhaust air is removed from the window using a 2600cfm HD exhaust fan -(200cfm per miner x 13)
-I built a hot isle for the GPU rigs and i figured i need 250cfm per 13 gpu rig with total capacity of 2200cfm. Put 2 inline fans in series with 12" ducting for total capacity of 2200cfm

Problem:

-the antminers and the exhaust fans now take all the air from the room and is alot of air is coming from the door edges and alot of air noises in my house etc.
-I have a total of 4800 cfm of air being exhausted

My questions
-Will an evaporative AC with high cfm be a good option since our humidity level is at 30-40% in Abu Dhabi (build a room inside mining room with an evaporative ac inside with the window open and a dehumidifier - the outlet for air from the evaporative ac will be the only thing exposed from the room pointing towards the rigs and antminers) or Duct option
-what other options i have to bring in cool 4800 cfm of fresh air

thanks for the help,. I will post pictures soon

I live in a similar climate as you do (Mediterranean). It gets close to 45 degrees in the summer.
I'm running 2x18000 CMH evaporative coolers mounted outside the warehouse and use insulated ducts to bring the cold air inside to cool 100 S9s.
Make sure your ducts are insulated otherwise they will rust.
The trick was to use a water cooler to cool the water supply to the cooler as 45 degrees is too high for these coolers.
No need to worry about moisture as these miners can handle up to 95% relative humidity. As long as the chips stay hot there will be no condensation.
I have a 7 meter tall ceiling so all the hot air goes up and don't even need exhaust fans. Just keep open windows on the top side and hot air is just pushed out due to positive pressure in the warehouse.
As far as I recall UAE has high humidity levels though so that's a serious negative factor for these swamp coolers.
Nice thing about swamp coolers is that in winter you can just use them as intake fans without any water supply.
Another thing to consider is that these industrial level swamp coolers go into self cleaning mode twice a day for about 5-8 minutes. So you need to watch your temperatures during that time.
Also better choose a 3 phase swamp cooler to better balance your load. It's a bit more expensive but it takes away the headache of load balancing.
Hope this helps.

What type of cooler you were using to cool the water supply to the swamp coolers. do you also exhaust 2x18000 cmh or less?

thanls