keep a small mining farm cool with only air conditioners.

[philipma1957]

one last item but only with a flat roof

https://roofvents.com/gravity-ventilators-aura-ventilator/av-30-c8-aura-vent-30-inch-diameter-8-inch-collar/


this vent on a flat roof on the hot isle side would allow hot air to leave the building.

I have three of them in my easier to cool room.

Noise would escape it with the heat.
                                                                     
                                                                     noise
                                                                     hot air
                                                                  << ^ >>
                                                                   !    ^  !
 roof.  >>     __________________________! vent  !____________


So it likely would not be good.



other than you had some way to direct the noise up rather than out the vent's sides.

much more of an afterthought last thing on the list idea.

[1714310916]

1714310916

[1714310916]

1714310916

[1714310916]

1714310916

[1714310916]

1714310916

[LoyceV]

Everyday, the sun beams to earth about 10,560 BTUs of energy per square foot.

source: https://www.extension.purdue.edu/extmedia/ae/ae-99.html#:~:text=Everyday%2C%20the%20sun%20beams%20to,available%20at%20the%20earth's%20surface.

1 BTU = 0.293 watts
so 10,560 BTU = 3,094 W per square foot
1 square meter = 10.76 squer foot
3,094 * 10.76 = 33,291w
1kw = 1000w
33,291w = 33.291kw per square meter.

You're confused with the units (and imperial units don't help). I already gave you the number: 1362 W/m² (high in the atmosphere). When calculating in watt, there's no reason to use BTU (or even joule). You took a unit of energy per day, and incorrectly converted that into a unit of power.
To start: 1 BTU/h is 0.293W. When you forget the "per hour", you'll end up with a 24 times larger number per day. So it would be 33.291kWh/m²/day, or much simpler: 1362 W/m².

ya, a lot of that is lost along the way, but really, 0.25mw is not a lot as far as ambient is concerned

Let's call it 0.25MW.

have you ever walked next to a hotel or a large building and felt that it was "strangely warm" in the street? ya standing on the exhaust side of the HVAC or near the external ACs units will be too hot, but just by walking around, it would be hard to tell if the building is consuming 1mw or none just by the "feel of it".

Aren't those exhausts usually at the roof of large buildings?

what happens when you put 20 patio heaters inside the house and walk outside, are you still going to feel the heat? probably nothing much unless there is enough airflow forcing that heat to your direction

Correct. And you're blowing all this heat out.

I have personal experience walking in and out of mining farms as large as 2MW, it's only warm at the exhaust side because heat is being pushed outside into that direction, walking around the other 3 walls you feel nothing.

So my concern is unnecessary. I haven't been in mining farms, I've been in (very big) power plants though, but they used water cooling or cooling towers.

We don't have the ACs in place yet, the noise is coming out the wall and more so from under the door, but sound travels in all directions so it goes through everything at different levels, there is at least a 20db drop between door open and close, but generally, it's not close to as quiet as we need it to be.

Have you considered acoustic wall insulation (see Dutch webshop)?

[mikeywith]

You're confused with the units (and imperial units don't help).

The above conversion of mine was correct, the mistake I made was not specifying that the numbers are per day which of course made everything seems 24 times larger than what they are, but then using the correct time unit makes your source and mine identical, thanks for the correction.

So my concern is unnecessary. I haven't been in mining farms, I've been in (very big) power plants though, but they used water cooling or cooling towers.

Wouldn't call it unnecessary, because if you had to cool 0.25MW where either fan blowing or AC units next to your neighbor's wall, then that would be a major problem, your neighbor would be happy in the winter and mad in the summer, . but with enough distance that exhausted heat won't be felt, so ya attempting that in a crowded city is not so smart.

Have you considered acoustic wall insulation (see Dutch webshop)?

Those won't work for our case, there is a huge difference between sound dampening and soundproofing, what we need is the latter, sound dampening is important for recording studios and all, but they are poor in soundproofing because acoustic panels have very low-density/mass and thus they won't help much with soundproofing.

source is above

Thanks for the source, I will be looking into it, it seems interesting.

other than you had some way to direct the noise up rather than out the vent's sides.

could you explain this further? how would noise escape up and not to the sides?

[LoyceV]

Those won't work for our case, there is a huge difference between sound dampening and soundproofing, what we need is the latter, sound dampening is important for recording studios and all, but they are poor in soundproofing because acoustic panels have very low-density/mass and thus they won't help much with soundproofing.

In that case: I guess an underground man cave isn't an option?

could you explain this further? how would noise escape up and not to the sides?

It's the same principle they use then building sound barriers (between roads and houses).

[philipma1957]

Those won't work for our case, there is a huge difference between sound dampening and soundproofing, what we need is the latter, sound dampening is important for recording studios and all, but they are poor in soundproofing because acoustic panels have very low-density/mass and thus they won't help much with soundproofing.

In that case: I guess an underground man cave isn't an option?

could you explain this further? how would noise escape up and not to the sides?

It's the same principle they use then building sound barriers (between roads and houses).

yeah a round tube over the vent would direct the sound up.


https://www.menards.com/main/plumbing/pipe-fittings/culvert-pipe-accessories/corrugated-solid-culvert-drain-pipe/48gf20np-wt-m294/p-14462876080127497-c-9567.htm


this could do 4 vents.  cut it to 5 feet long

it would direct the sound up.

 I own 3 of the vents and they are good but if you stand on the flat roof they are noisy.


this would make the noise go up not out.

also both the vent and this would last a long time.


this is 60 inch by 20 feet

https://www.menards.com/main/plumbing/pipe-fittings/culvert-pipe-accessories/corrugated-solid-culvert-drain-pipe/60gf20np-wt-m294/p-14462876080127404-c-9567.htm

the first was 48 inch  by  20 feet.

BTW if these work these would lower your ac use a bit.

4 vents and 1 pipe would be around 3500 usd here in the states.

Still not enough air out the room with them but you could move 8000 - 10000 cfm with 4 of them.

here is one of ours not yet installed.