Any Chemists Here? Know One?please Come On In!

[SciManAl]

and no alcohol would suck as a coolant. u want some very cold like LN. you wouldn't want the pipes to become pipebombs do ya?

alcohol as coolant lol... that's rich 

i would not be so harsh, this info was nice to have, it explains why the water level drops so often in my WC set up... and alchohol doesn't tend to burn in an atmospher lacking any air... whi9ch wil be the case inside the cooling unit... i figured nothing explosive should be present since there is so much volatile componets...

it expands until the pressure is so great it turns back to liquid again, heat is given out in the compression process

i doubt it'll come to that as sciman stated

correct, it will not come to that, but it will do that as described...

[_John_Lennon_]

Originally posted by SciManAl@12 January 2004 - 18:17

and no alcohol would suck as a coolant. u want some very cold like LN. you wouldn't want the pipes to become pipebombs do ya?

alcohol as coolant lol... that's rich

i would not be so harsh, this info was nice to have, it explains why the water level drops so often in my WC set up... and alchohol doesn't tend to burn in an atmospher lacking any air... whi9ch wil be the case inside the cooling unit... i figured nothing explosive should be present since there is so much volatile componets...

it expands until the pressure is so great it turns back to liquid again, heat is given out in the compression process

i doubt it'll come to that as sciman stated

correct, it will not come to that, but it will do that as described...

Sciman, I must be missing something, but im not going to argue with you on this one, dont know about it that much.

But, IM me sometime so we can talk a bit more. @ DrkSideoftheLoon

[lynx]

Just how would you keep the nitrogen in a liquid state? This in itself would require a major refrigeration plant, which is hardly the point of the exercise. Otherwise, as it vaporised the pressure would rise. And rise. And rise until ...

BANG!

The whole point of a heat pipe it that the coolant has to be liquid at "normal" temps, but be capable of being easily vaporised. Alcohols fit this scenario very well, and in a sealed environment there is no risk of fire. Although the "flash" point is realtively low, this still requires an ignition source. The self ignition point is in the region of 400C. Not much chance of a pipe bomb there.

[SciManAl]

Just how would you keep the nitrogen in a liquid state? This in itself would require a major refrigeration plant, which is hardly the point of the exercise. Otherwise, as it vaporised the pressure would rise. And rise. And rise until ...

and rise untiull it turned back into a liquid again...

[lynx]

Originally posted by SciManAl@13 January 2004 - 01:59

Just how would you keep the nitrogen in a liquid state? This in itself would require a major refrigeration plant, which is hardly the point of the exercise. Otherwise, as it vaporised the pressure would rise. And rise. And rise until ...

and rise untiull it turned back into a liquid again...

Not without some EXTREME cooling measures. Have you realised just how cold -196C actually is? That's the temperature at which it boils. Like a kettle. Or a steam engine.

If you try to heat a sealed hot water cylinder to 300C, it will probably explode long before you get there. Thats at 200C above the boiling point.

200C above the boiling point of nitrogen is 4C. So if you put liguid nitrogen in a sealed vessel and fail to keep it cold enough, you can work out for yourself what is likely to happen.

[james_bond_rulez]

i dont know much about metals but isn't metals in colds like that become more brital? and with all taht contraction and expansion u r due to have a structual failure sometime and next time u know it explodes in ur face....

metals soften when heated but become crystalized when extreme cooled.

without a compressor to constantly take the heat out ur only buffer is the coolant itself.

have u ever tried to remove the coolant cap when a car engine is running? (dont do this at home) but if u do coolant shoots out like crazy, pressure does build up inside...

[james_bond_rulez]

oh and btw the chipsets are pumping out heat continuously so if the LN isn't moving (not circulating and actively transporting the heat OUTSIDE the machine) all ur system does is absorbing the heat, give it out and so on it doesn't move the heat OUTSIDE like a frige does

how r u gonna solve that? eventually u r gonna have a heat build up so great ur system isn't gonna take it anymore

it is still a FLAWED system

[_John_Lennon_]

Originally posted by james_bond_rulez@12 January 2004 - 22:31
oh and btw the chipsets are pumping out heat continuously so if the LN isn't moving (not circulating and actively transporting the heat OUTSIDE the machine) all ur system does is absorbing the heat, give it out and so on it doesn't move the heat OUTSIDE like a frige does

how r u gonna solve that? eventually u r gonna have a heat build up so great ur system isn't gonna take it anymore

it is still a FLAWED system

James, I know where your going with this.

Basically, your saying that energy is building up, with the LN trying to expand like heck, using all its energy to try and break open the block. So of course it will win right? Because if not than the energy will still remain intact?Well, not exactly.

Think about it like this, have you ever pushed on something really big? Like say, the side of the building? Well, in this example, you are exerting energy on the building, beacuse you of course get tired, but does the building show and kind of result of the energy? No.

Its the same way with this steel enclosure that the LN is in. The LN tries to get out, but the steel keeps it in, just like a big building with a comparatively small force being exerted on it. Eventually, if you put enough energy on it, than it will fall explode, but this will take just as long as you to actually push over the building.

So the LN loses its energy trying to expand, and goes back to its normal state.

[SingaBoiy]

So im guessing the project was unsuccessful lol

[clocker]

Probably a safe assumption, yes.