Cooling solution - m³/h calculation - extractor

[Zitrus]

Hey,

at the moment i'm cooling my mining farm with AC/s, but it takes a lot of electricity so i want to change it.

I want to build a wood box, as small as possible, and put all my miners in it.
On the top i want to put a strong extractor fan, and on the bottom fresh air holes with filter.

Something like this but bigger: https://www.youtube.com/watch?v=_qbLkivgxps

But now i got some questions.

1. The outside air temperature is the hole year around 90-110F (32-42C). Is it possible to cool the mining hardware dow?
I think yes, because the hardware is running hotter already, so it's just important to change the hole are in the box fast enough so it can't head up

2. The humidity is the hole year around 70-90%. Is it dangerous for the miners? i don't think so, because the air inside the box it hotter than the outside air, so no
condensation. The humidity don't get close to the hardware.

3. How can i calculate the power (m³/h) the extractor fan on the top of the box needs? I can calculate the hole volume of the wood box, but even then i have
to calculate something with the Watt and the heat to know how fast i have to take the air outside.

Thanks for every answer

[morcus]

Hello,

Here is a calculator for what you need.
https://www.stego.de/nc/en/services/calculation-tools/cooling-calculation/

Just write the Temperature differential, the Installed stray power in watts, and your altitude. They will provide how many m3/h you need to cool everything down.

I can recommand to order something like this for the extraction.
http://www.ventilatie-systemen.eu/extractor-isolated-with-torin-4250-p-1413.html

They are quiet, and are very powerful.

Edit: For the humidity the best practice is 50%. High humidity = condensation, Low humidity = cause electrostatics discharge
You can use a dehumidifier if you have a condensation problem.

[umine]

As the simpliest way is to sum airflows of all GPUs and multiply it by 2. For example 1 GPU fans produce about 200 m³/h, you have 5 rigs of 8GPU each: 200 * 8 * 5 = 8000 m³/h. So you need one 700mm axial fan (efficiency 15-16k m³/h) for this config

[morcus]

As the simpliest way is to sum airflows of all GPUs and multiply it by 2. For example 1 GPU fans produce about 200 m³/h, you have 5 rigs of 8GPU each: 200 * 8 * 5 = 8000 m³/h. So you need one 700mm axial fan (efficiency 15-16k m³/h) for this config

I am not really OK with this statement. This seems to be really overkill.
The half of what you said makes sense.

[Zitrus]

Hello,

Here is a calculator for what you need.
https://www.stego.de/nc/en/services/calculation-tools/cooling-calculation/

Just write the Temperature differential, the Installed stray power in watts, and your altitude. They will provide how many m3/h you need to cool everything down.

I can recommand to order something like this for the extraction.
http://www.ventilatie-systemen.eu/extractor-isolated-with-torin-4250-p-1413.html

They are quiet, and are very powerful.

Edit: For the humidity the best practice is 50%. High humidity = condensation, Low humidity = cause electrostatics discharge
You can use a dehumidifier if you have a condensation problem.

Thanks

What you mean with "use a dehumidifier? Where you want to put it? I think inside the box it makes no sense? It's not fast enough to deal with the air it's coming inside.