Quote from: miner417 on May 19, 2017, 06:25:57 PM

Quote from: philipma1957 on May 19, 2017, 06:20:45 PM

Quote from: miner417 on May 19, 2017, 06:15:44 PM

Quote from: philipma1957 on May 19, 2017, 06:06:54 PM

Quote from: miner417 on May 19, 2017, 05:23:05 PM

Quote from: RentGPU on May 19, 2017, 05:10:07 PM

Quote from: doktor83 on May 19, 2017, 05:01:22 PM

best is to blow the air OUT of the room, no need to pump in fresh air.

Sorry but thats not true , fresh air must be pumped to cool down the machines , it's a simple rule if there is exhaust there must be intake to fill the hot air pumped out with cool fresh air.

Shouldn't the pressure created from the exhaust, if it's enough, create the suction needed to bring the fresh air in?

yes

vent >>>>>>>> gear >>>>>> exhaust fan >>>>>>

can work but many details are needed.

4 rigs could be 6 nvidia 1080 ti cards per rig or close to 4500 watts

the no fan vent could be too small.

the fanned exhaust vent needs to be strong

we have two of these

http://www.homedepot.com/p/Master-Flow-1600-CFM-Power-Gable-Mount-Attic-Fan-EGV6/205924917

in the solar array we have 9kwatts of mixed gear

It's currently like this, Exhaust is the in top left of the room. The center of the room is the 4 rigs, mix of rx 470, rx 480, 24 cards total, about 4KW. In the bottom right of the room is the intake vent.

The room is small. 3.5x4.5x8. I know currently the exhaust isn't up to snuff for what I have, I'm looking at probably a 500ish CFM exhaust, or is that lowballing it? Currently I'm just using a couple small leftover furnace fans to exhaust, and that's probably the biggest issue.

yeah way low on exhaust. my gear is 9kwatts and the two exhaust are 1600+1600 = 3200 which is 5-7 x what you have .

an we are 2-2.3 x the power so you need 1000 to 1600 cfm exhaust not 500 cfm.

how big in you intake vent ? a 4inch dryer hole? way too small

Shouldn't exhaust have more to deal with the actual cubic feet more than amount of power being used?

Also do you think the heat shield stuff you're using is worth it? Does it seem to be helping?

And final question I think, you have fans that you say are push, are those directed at the cards themselves to blow cooler air directly over them?

this is second summer coming.

based on last year 1 1600 cfm exhaust fan pull and 1 box fan push was not enough

so we have 2 1600 cfm pull and it was 95 f yesterday in NJ. that loft would be 105F with no gear running. with the heat shield and the tarp (no photo yet) running the gear the loft was 92f.

if you look at photos the loft allows heat via the fiber glass roof. so the heat shield the tarp and soon the silver bubble warp are needed to prevent sun's heat adding to the gears heat.

plus the car insulation wrap is made for car engines so it is a fire shield and great lowers the noise.