Cheapest way to make a cooling chamber?

The CO2 triple point of CO2 is at 5 atm and -57 C.

You need at least 50 atm to have liquid CO2 at room temperatures.

They do, at least below 31C. Above that it's supercritical CO2. Cheap paintball tanks are all liquid CO2, and valves and hardware are easy to get IIRC. The critical pressure is around 75 PSI, so it's pretty easy to handle.

Cheers

Phil Hobbs

snipped-for-privacy@downunder.com wrote in news: snipped-for-privacy@4ax.com:

CO2 tanks used by welders are 5000 Lb test tanks typically filled to 3000 psi. That is 204 atmospheres.

CO2 is not used for cooling because it is a deadly gas that has no stink indicators put into it like the flammables have... oh and nitrous too because they can't be letting any of us having any fun. There are no high pressure sealed heat pipe configurations that I know of. Everything uses media that has low RVP and low boil point.

I liked water systems because by the time I tried it, all the years of letting the users pipe things up were pretty messy. Now, it is a sealed system and very easy to add making my machine quieter and cooler at the same time. Can't mod my laptop though. I am certain it uses heat pipe technology. I wish they made a door on the bottom so I could blow the dust out of it in the right direction. Does not run hot though despite being a Xeon and Quadro graphics. Of course I need to tax it more to really test that now that I have had it a while. I hate dust.

As I said, one of my PPoEs had a commercial environmental testing chamber that used electric heat and open-cycle liquid CO2 cooling. It worked fine. The amount of CO2 required was trivial.

Cheers

Phil Hobbs

Your ignorance knows no bounds. The atmosphere is 0.04% CO2. If it were a deadly gas we would already be dead. If it is in high proportions, high e nough to reduce the O2 concentration from the normal ~20%, then it might ha ve impacts. The same could be said for literally ANY gas.

You are likely confusing CO2 with CO which is a deadly poison. You can eve n be alive and breathing but if you have absorbed enough CO into your syste m there is nothing that can be done to remove it and you will die essential ly from lack of O2. The CO has a much higher affinity for O2 and won't let it go, so you breath in as much O2 as you want and it never reaches your c ells.

Rick C wrote in news: snipped-for-privacy@googlegroups.com:

You had to reply with this stupid shit? Grow up, punk. You know nothing about what I know or not.

Idiot. It is deadly. It displaces oxygen. Try taking a nice deep breath of it right off the tank nozzle. Better yet close yourself and your car up in your garage and run your car at idle for about twenty minutes with you in the garage with it. That should convince... your relatives... because you'll be dead.

.04% is NOT a 'deadly' concentration 'level'.

Looks like you are the one with the boundless retardation.

That's what I said. EVERY gas is capable of displacing oxygen. Literally EVERY GAS!!! That doesn't make it a deadly poison.

Just as I thought you don't know the difference between CO2 and CO. Car exhaust kills you from the CO.

Looks like you are not capable of learning. Rather than trying to understand that you don't know something, you have to hurl insults at those who explain your mistakes.

Whatever. It's very clear to everyone, literally everyone here. You are the only person who fails to see when you are wrong.

fredag den 7. februar 2020 kl. 19.47.54 UTC+1 skrev DecadentLinux...@decade nce.org:

the body?s breathing control system runs on the CO2 level in the lu ngs so if there's increase the CO2 level it'll make you breathe harder

breathing pure CO2 will probably feel like you just held your breath for 2 minutes

obviously if the oxygen level is low enough breathing harder won't help

car exhaust kills you with the much more dangerous CO

it is for CO

A car with a working catalytic converter and oxygen sensor, and no exhaust leaks, doesn't produce much CO. Pre-1974 cars were much more dangerous.

Cheers

Phil Hobbs

As I read it, CO2 can begin to show long-term toxic effects at concentrations of as low as .5%, with short-term toxicity up in the few-percent range. Up in the 7-10% range there's apparently a real risk of suffocation and death even if there's adequate oxygen. It _is_ a chemically and physiologically-active gas, so its effect on us is more than just that of oxygen-exclusion (as you might get with nitrogen or argon).

It's nowhere near as toxic as carbon monoxide, of course, but not as safe as a non-reactive gas.

As to why it's not used more as a coolant... I suspect that the higher pressures required to liquify it (as compared to the halogen-based refrigerants commonly used) may play a part in that.

Rick C wrote in news: snipped-for-privacy@googlegroups.com:

It is the CO2, becasue the CO2 is what causes the reduction of oxygen in the combustion process that causes the rise in CO.

I know more about it tahn you do, chump.

Just as I thought, you are almost as much of a presumptuous putz as Sloman is.

Rick C wrote in news:13c5b742-27fd- snipped-for-privacy@googlegroups.com:

Looks like you are incapable of being anything other than a presumptuous putz.

Rick C wrote in news: snipped-for-privacy@googlegroups.com:

Looks like you are the one hurling the insults Just read the horsehit you posted.

snipped-for-privacy@coop.radagast.org (Dave Platt) wrote in news: snipped-for-privacy@coop.radagast.org:

the fluorocarbon based coolants were far easier to work with. Remember when they used dangerous ammonia as a coolant. It works very well. Another good one is propane or butane, but BOTH are a no-go for obvious reasons.

Using a substance that is a gas at room temp is not a good choice IMO for the very reason you gave.

fredag den 7. februar 2020 kl. 21.01.03 UTC+1 skrev snipped-for-privacy@decadence.org:

ammonia is still used in big industrial refrigeration, here most if not all new refrigerators and freezers use propane (R290)

Oh, it's toxic, all right, at about 4% (it acidifies the blood); except for Apollo 13, there's not a lot of dangerous situations. One can use ventilation to cope with the minor annoyance.

Even oxygen is toxic, at 100%. The dose makes it toxic.

How about a used laboratory freezer. Some go to minus 80 C.

Joe Gwinn

cadence.org:

e lungs

It doesn't take much CO. Levels of just 10 ppm can cause problems with lon g term exposure. Thresholds of exposure depend on the duration, but double digits are generally considered to be unsafe for at least part of the popu lation. Even after the catalytic converter CO levels are well above this.

Directly at the exhaust port of the engine levels can reach 10's of thousan ds of ppm (in other words per cent!). The catalytic converter can reduce t his by a large amount, but not enough to make auto exhaust safe. So "not m uch" is not a very good measure. Many people still die from breathing auto exhaust and a running engine in a garage requires an open door or an exhau st tube.

whit3rd wrote in news: snipped-for-privacy@googlegroups.com:

This cannot be true as the initial Apollo missions were 100% oxygen environment. It failed for the other obvious reason.

Kapton tape is not flammable in ordinary air. In a pure Oxygen environment it can light by a single spark and burn with a fury. As shown on the Apollo 1 mission tragedy.