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Hi Guys

i am renting a 1200 ft warehouse and i have 18 Antminer s9s

i only have a 4 or 5 inch exhaust to get rid of the hot air

i have tried the following for heat management:
1- installing an exhaust fan to the opening( building a box around the exhaust fan of the antminers to directly suck the hot air out )
2- i have tried to install a y-exhaust tube to the 4 or 5 inch opening the the roof for an ac and the exhaust fan
3- i moved the machines into a separate room with their exhaust faced outside the room(AC in the room) and had the box stated in number 1 outside the room

THE WAREHOUSE TEMPERATURE IS STILL 42 DEGREES CELSIUS

now i am thinking of evaporator cooling but i need suggestions on how to solve the heat issue

any suggestions????

which is more important
1-cooling the room
2-getting rid of the hot air ?

You have to get rid of the hot air, and bring in fresh air. S9's generate 90 cfm of air flow each, if you can capture the hot air you can channel it to an exit point. Dont try and cool the room with an air conditioner, its better to use that power for miners. Evaporative cooling works, but it raises the humidity and can cause corrosion, although s9's may only be viable for another 5 to 8 months. If you have a ceiling vent you might try arranging in a circle and vent the air up, that takes advantage of hot air displacement, I have seen a number of large setups do that.

just my $.02

the problem is i only have a 4 inch diameter on the roof, and I am not permitted to make any changes to the ceiling

i might try evaportative cooling in the open space in the warehouse (Not in the room where the machines are located) and also get a dehumidifier to get rid of the humidity

how do you calculate how much humidity a evaporative cooler induces ??

Do you have outside doors, you can replace solid doors with metal bar'd doors. The problem you have is your pumping energy into the room, you have to remove the heat. You really have to vent the exhaust heat outside somehow, sounds like your over 105 degrees in the warehouse, which means you may already be looking at damage to the equipment already.

I do believe you really have to get rid of the hot air, I have a few 100 of these running and there is really no way treat the hot air coming out of these units, you just have to duct it outside.

okay there are some laws of physics.

you have 18 s-9's each have about a 120mm hole and strong fans

120mm = about 4.8 inches  the area of a circle is pi r squared

or  2.4 x 2.4 x 3.14 + 18 square inches  and you have 18 of them so 325 square inches  is the smallest size for you exit hole

you have 2 x 2 x 3.14 =  12.56 square inches  so  you need to increase the hole 25 x  and have fans to suck the air out.


you need 2 of these  https://www.homedepot.com/p/Master-Flow-1600-CFM-Power-Gable-Mount-Attic-Fan-EGV6/205924917


I suggest you move the gear.

My problem is i only have a 4 or 5 inch hole in the celieng and i cant make any other holes or make this one bigger

Then you need to find another space

CFM is CFM you're putting out waste heat, you MUST get rid of it, period.

Well... theoretically he could get by with the 4" hole if he could move the air through it quick enough.  Thinking along the lines of one of those gas turbines that power the old Batmobile...

btw - I figured 300 cfm per S9, once you combine the effect of the 2 high speed fans, so he would need to move 5400 cfm through a hole with a cross section of about 12.5 sq inches.  Doesn't that mean he would need the air to move at about 5400 feet per minute, abit over 60 mph?  That would be amusing to see.  Its only slightly below hurricane wind speeds.

Take out a window(s) and install exhaust fan(s) to fit the what should be a sizeable opening. No damage to building and when you move just have to replace the window.