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voqn

Self Cooling Aquatuner with Ethanol

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KittenIsAGeek    1,434

I've been wanting to try this since the Crying Crab post.  The extra space to create vacuum above the ethanol is crucial.  Great post, @voqn.   Nicely laid out details and information.

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DonDegow    77

That's quite neat but I wouldn't use ethanol phase changes as a primary cooling method but more of an amplifier of another system.

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wachunga    211

You can use water instead of ethanol and get heat deletion in the same way. So I think it's less about manipulating SHC differences and more about the game being buggy with heat energy when you have droplets that evaporate causing big changes in gas pressure. Same thing as turbines deleting heat when the output water is feed back into the steam chamber in certain ways.

 

The turbine heat deletion has been posted about several times. There is a bug report somewhere that shows the bug with 2 cells of differing gas pressures mixing. I can't be arsed to find it though.

 

Nice idea though. I'm a fan of doing clever things by condensing gases. It's a shame the game is so damn buggy.

Edited by wachunga
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psusi    188
6 hours ago, wachunga said:

You can use water instead of ethanol and get heat deletion in the same way. So I think it's less about manipulating SHC differences and more about the game being buggy with heat energy when you have droplets that evaporate causing big changes in gas pressure. Same thing as turbines deleting heat when the output water is feed back into the steam chamber in certain ways.

No you can't.  It works with ethanol because of the difference in SHC.  Water and steam have the same SHC.

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Junksteel    804

Amazing work! I'll try it in my next run. I'm a cooling maniac... Excellent reason to work with Ethanol!

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Craigjw    405
2 hours ago, Junksteel said:

Amazing work! I'll try it in my next run. I'm a cooling maniac... Excellent reason to work with Ethanol!

Ethanol is such a amazing invention.  Dupes should really become drunk when exposed to it without a atmo suit!

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Lifegrow    1,566
15 hours ago, psusi said:

No you can't.  It works with ethanol because of the difference in SHC.  Water and steam have the same SHC.

Are you sure? Have you done any of your own testing?

It seems to me that @wachunga's point is that this isn't necessarily solely down to SHC difference, and is in part down to the fact that rapid pressure changes/condensation is still not entirely predictable in this *simulation* 

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beowulf2010    572
29 minutes ago, Lifegrow said:

Are you sure? Have you done any of your own testing?

It seems to me that @wachunga's point is that this isn't necessarily solely down to SHC difference, and is in part down to the fact that rapid pressure changes/condensation is still not entirely predictable in this *simulation* 

Considering the original poster stated that the results were better than they calculated, I'm inclined to agree. 

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BT_20    51

You could probably push the cooling from the SHC difference a lot further by using the 100g/s gas pipe trick to super cool the ethanol gas.

Edited by BT_20

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psusi    188

I suppose you could also be triggering that bug that deletes heat from turbines.

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voqn    54
2 minutes ago, psusi said:

I suppose you could also be triggering that bug that deletes heat from turbines.

Yeah, after I thought about it.

 

On 2020/1/22 at 7:03 PM, voqn said:
  •  I didn't wait for more than a dozen cycles to get this result
  •  It seemed that heat deletion was stronger than expected

I assume that result included turbines over heat deletion bug.

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KittenIsAGeek    1,434

You _can_ use water instead of Ethanol in much the same way, but your margins are incredibly slim -- it can take a dozen cycles to drop your 'cold' room by a few C.  Boiling is a high-energy transition and condensing is a low-energy transition.  There's a built in hysteresis between boiling and condensing, but it only gives you about 5C to work with.  You'll get faster results with a wheezewart in hydrogen.  Also, you'll be right at the edge of your materials unless you use steel for the aquatuner.  It was MUCH easier before the drip bug was resolved, but it still worked after. 

I've done it in the past, but since the change in how steam turbines work, its much easier just to go that route.  A turbine will get your room cold in a cycle or two.  So if you're not using Ethanol, you might as well just use a turbine.

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wachunga    211

I found this concept interesting enough to make a test rig to get a ballpark idea of the heat deletion between water and ethanol.

SelfCoolingAT.sav

Flip the atmos to start the ATs. Watch reservoir temps to evaluate the heat deletion. Ethanol does about twice that of plain water. One would suggest the deletion is about half from the bug and half from the SHC manipulation. There is a poorly understood bug involved though, so I would advise caution in reading too much into it.

Hydrogen is provided to demonstrate the heat deletion bug is very likely due to liquids blorping into gas over and over. It's reservoir temp will go down, but that's because heat is being dumped into the hydrogen. Manipulate the hydro sensor to return the reservoir temp to it's initial state and you'll see the hydrogen temp has returned to it's initial state as well (rounding errors notwithstanding).

I hope this can lay to rest the question of whether or not there is a bug deleting substantial amounts of heat in these types of builds.

 

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DonDegow    77
On 22/01/2020 at 8:15 PM, wachunga said:

The turbine heat deletion has been posted about several times. There is a bug report somewhere that shows the bug with 2 cells of differing gas pressures mixing. I can't be arsed to find it though.

Is this what you're looking for? 

 

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wachunga    211

Yes that's the main discussion, thank you. I was vaguely aware of oddities prior, but that really delved into it. Credit to Tonyroid for putting in the work testing and figuring stuff out.

I think I found the report I was thinking of:

And for good measure:

 

Searching back through through all the reports really makes it clear how many unresolved and unacknowledged issues there are.

Klei please.

Edited by wachunga

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