Cooling Capacity Puns

Hi,

I am planning to watercool two of my 3090 strix stacked and nvlinked.

The thing is, I am running on openair testbench constantly, so I don't want to mount multiple radiators on it.

So my plan is to use one PE360 from EKWB to do the job.

Fan speed and noise wise, I prefer 1500rpm - 2000rpm, Noctua A12 or similar fans.

I am in Singapore, so room temp is constantly 28-30. As long as the water temp is below 45C, I guess I don't really care, also.

So, the question is, is single 360PE enough to achieve that water temp <45C?

BTW, no overclocking, just normal 350 watts on each card to run MachineLearning stuffs.

And FYI, there is no particular reason why I choose STRIX... it is just because there is only strix available at that time I brought the first one. So if I want to nvlink, I had to brought yet another strix...

This podcast from Andrew Huberman may be of interest to people.

https://www.youtube.com/watch?v=xaE9XyMMAHY

At around 53:17 in this podcast he talks about a cold protocol I thought was fascinating. It involves cooling via palms of hands between sets to increase work capacity.

I've been using it for the past 3 months now between sets. My own anecdotal experience is that my readiness for the next set is significantly faster than if I was simply doing Fast and Loose drills. I gain control of breathing faster, heart rate drops and muscles often feel as fresh as the first set. This would be useful for those running time-restricted auto regulated programs like The Giant.

Unfortunately I can't tell if my numbers increased because of the protocol or the program. This is because when I started using it I was already towards the end of the program and haven't dropped using it since. I would however be interested to hear how/if it works for other people.

Say you have an evap that needs a cooling capacity of 300 watts at -20c

but you want to pull the evap down to -40c, while keeping mass flow the same, would you need the same amount of watts of cooling (300 watts @ -40 /bigger compressor) to obtain -40c or would you need less/more

I want to find the relationship between the two variables( SHC and LoC) , but am not sure how this relationship can be represented in equation form.

Looking for inputs from experts in the Air conditioning /cooling area.

We have changed apartments and found the fixed charges (@AED 750 per TR per year) are almost double of our previous apartment which was bigger in size though both had equal bedrooms and AC units. Both apartments are in the same locality and served by the same district cooling company only difference is that in the previous it was directly billed by the District Cooling company while in the current one there is another company that does metering and billing.

We spoke with the Building Management they said the assessed cooling capacity is depending on a number of factors, such as window sizes, walls facing direct sun light etc, which we understand and agree but still it wouldn't result in double the required capacity.

Then we were told that it also depends upon the AC units installed in the apartment, whether they have 1 motor or 2 motor, how powerful those motors are etc.... Now this part didn't seem somehow right to us.

Any inputs are welcome.

The design temperature, say is 6 deg C leaving, and 14 deg C return. But the actual return is only 12 deg C. Flowrate as per design. How do we interpolate the refrigeration tonnage I get now to prove that it can still produce the design tonnage? Currently, is not possible to have the return temperature at 14 deg C. Is there any formulae to calculate?

I'm looking to upgrade the cooling system of my living room HTPC-productivity-mining station, which is planned to have a ~1000W TDP. To find a suitable case seems quite difficult.

• Enthoo Pro 2: Seems to fit dual TX480 radiators and another 360mm thick radiator at the bottom, with 4x140mm fans to exhuast the hot air out. Very good cooling capacity but a bit too big and ugly for the living room

• O11 Air: I'm building on one for my gaming desktop. It fits 2x360mm + 280mm intakes and 2x120mm + 140mm + 2x80mm exhausts, but the fan mount grill seems quite restrictive. Also the bottom rad compatibility with PCI-E slots is not very future proof

• External solutions like MO-RA3. They should work, but need to work out the aesthetics for them in the living room. Also what cases are ideal for this?

Other cases smaller than Enthoo Pro 2 I checked either don't house large enough radiators or don't have enough slots to support all of them with fresh air (i.e. not enough exhausts if set as intake, or vice versa, even counting passive PCI-E grill) I don't want to feed radiators with hot air because they seem restrictive and uneffective (I measured the radiator exhaust air on my previous builds to be close to water temperature). Any other suggestions? Thanks!

I have a question about how compressor capacity translates into evaporator capacity. In the specs for a two-stage compressor (standard split system with TXV), it says that when the compressor operates at 2/3 capacity, the evaporator capacity is 3/4 that of full. I'm wondering why the capacity drops don't match? It it always a fixed relationship? What factors cause it to not be equal? Thanks.

Chris Anthony CEO
founder

Thanks for the question. We are designing to a 6% grade @ 65mph for 10mins in 110f heat. But we expect to have a comfortable safety factor in that. If the grade is steeper or if it's much hotter then the system would just cut back to reduce the heat and you'd lose a bit of power. We don't know exactly what the cut back will be until we do more testing but that's how it works ;) Thanks for your support!

Using ekwb’s configurator, I selected the components 3700x and 2080ti with silent + OC. In looking for the new hardware coming out and trying to find what I need.

It tells me the expected heat load is 460W and recommends a 240mm rad that has cooling capacity of 283W. With this it says “expected liquid temp is 38°C” and “Your selected radiator will sufficiently cool your hardware but temperatures will be higher”.

I’m a little confused about 283W of cooling can handle 460W of heat without getting overwhelmed? I assume the rooms temp with have something to do with it as well but not sure. I’ve also seen others on here talk about how multiple huge rads (360mm) isn’t enough for similar setup, but I just don’t believe that.

Any help would be greatly appreciated!

Hi!

I'm currently looking at a new helmet and after trying quite a few that didn't fit the shape of my head so well I ended up with 2 models that did have a good fit. One of them is the Lazer Century a sort of hybrid aero helmet (the other one is twice the price). Ofcourse a bit of aero sounds good but as I'm a heavy head sweater I'm a bit worried that the cooling capacity isn't enough for me. The guy at the shop told me without the shield it's just like any other helmet.. But is it?

Anyone here has such a helmet and how do you experience the cooling of this model compared to other helmets you had?

Hi can anyone suggest the correct way to determine the power/cooling capacity I would need to bring a volume enclosed in glass down to a temperature below 8c in an ambient temperature of about 40c?

The dimensions of the enclosure (salad/meat display) will be around 5m length x 0.8m width x 0.6m height.

I would like to size an appropriate evaporator.. eventually.

Thanks