So that would be a 3rd option.
Problem is, that the room has several carriers at the ceiling - like 15cm bumps. Could hang the piping unter that.
Also, due to the pressure lose within the ducts, i would have an over pressure in the room because the exhaust fan would have to push air through several meters of ducts.
Would need to split the room anyways since it is too long.
But would it make so much of a difference?
I mean, if I such out the air of a 65m³ hot room with 8000m³ and supply on the cold side the same 8000m³ of fresh air, would that not be enough? It is an air exchange of over 2x per minute. Because it is easy to install some insulating panels to split the room. but not that easy to install meters of 500mm ducts hanging from the ceiling.
Calculate the BTU load coming off the gear and that is answerable. I know that forcing the air to flow through the gear is the best way. Just through a room means most air is not coming in contact with the hot parts.
I use a similar process to cool a cubic meter plywood box. Its got around 60~75 gpus in it and at the bottom are filters for air in. Out the top is a meter diameter fan that runs wide open and even in very hot summers the gpus all run below 70c (air temp will get to 100+F...there is math involved and its the weekend). The air is forced to pull through the smaller inside box containing the rigs. And you can size the duct as needed....but the window size is the throttle point of the whole system...i would probably put a fan on outpu and one in or near input... similar to asic designs...push pull...i mean thats exactly what they are doing...just they have a small densly packed space...you gotta have some room to work and such on them.
For the calculation, it would be about 20kW of hardware.
You are referring to the 3D drawing with your answer, right?
But I would also need to make gaps, so that the air only goes through the miners, right?
If we take my initial design, wouldnt that be somehow similar, even if not optimal?
I mean, I am going for a simple solution. The ceiling is not really good to mount anything on it, I would need to support the duct with columns. Even the lamps were a pain to mount because of the structure of the ceiling.