Re: Fourth alt coin thread last three got oversized.

Hi guys hoping to get some feedback on my room plan:

#1 is my current plan: pull cold air in from the window and push them over rigs with fans behind each rig, then pull hot air out from the front of the rigs and use an exhaust fan in the ceiling to collect hot air and exhaust it out of the roof. This should be sufficient cooling for about the ~105 GPUs I can fit on that shelving unit

HOWEVER! I would like to leave open the possibility of expanding in the future without having to move the exhaust fan's ceiling location. So I was wondering if #2 would work if I double my size. As you can see I'd be using fans on the ground to push the incoming air up at all the rigs but I'm unsure if that 15 ft (4.5m) is too much distance to hope to carry the air.

Fwiw, I'm dealing with 75-85 Fahrenheit (24-29c) ambient temps

Any thoughts would be appreciated!

Getting this as efficient as you can is HVAC math. I'm good enough at HVAC to be dangerous, but I do my own work and haven't ever screwed anything up majorly. Your most limiting factor is probably input and exhaust air volume of the room based on the opening sizes. I'd calculate that first and then the fans you have pushing the air over the rigs may be an issue or a bonus, but if those are portable, easy to cope later. You want input and exhaust as far away from each other in the room as possible. Ideally you also input from near or in the floor and exhaust from the ceiling or very near as well. Guessing is why most home cooling systems are inefficient, almost nobody nobody does the math, they just slam in a too big or too small system and cash the checks.

What type of fans are you going to use for input and exhaust?

My room is about 17x12 ft.

My window is 54x34 in and I was going to mount one of these 3150 cfm fans in the window (next to the screen) for pushing air in: http://www.homedepot.com/p/Ventamatic-20-in-High-Velocity-Floor-Fan-HVFF-20UPS/202795625

And this 5000 cfm fan for air exhaust in the ceiling.: http://www.homedepot.com/p/iLIVING-5000-CFM-Power-30-in-Single-Speed-Shutter-Exhaust-Fan-ILG8SF30S/207174738

I just learned its supposed to be a 2 to 1 exhaust:intake ratio so maybe I should find a slightly less powerful fan for air intake?

The fans I am planning to use behind each rig is the 550 cfm version of this fan, easily portable so yeah I can cope with issues pretty easily: http://orionfans.com/products/dc-fans/item/od254.html

In the front of each rig I was going to put a line of 5 x 180 cfm fans where the GPUs end

I didn't know the exhaust should be far away from the intake as possible. I thought I could put the shelving unit right by the window (close to the cold air) and use tarps to control the hot air side and try to exhaust it immediately right there.

Appreciate any advice!

the intake fan has 3 speeds so set it on medium or low.

I suggest making hot air guides with this

https://www.amazon.com/s?marketplaceID=ATVPDKIKX0DER&me=A33WZPZ4QHXNRF&merchant=A33WZPZ4QHXNRF&redirect=true

https://www.amazon.com/Car-Insulation-Deadener-Automotive-Lightweight/dp/B016QUS1YE/ref=sr_1_1?

many sizes.

it will cut down noise
it will keep hot air contained
it is fire resistant

easy to use
a good scissor
a staple gun
some metal tape

https://www.amazon.com/Homemory-Aluminum-Inches-Yards-Furnace/dp/B01M7S4APP/ref=sr_1_2?

build this hot air/heat/sound guide for under 200

I use it in my solar array