Recirculation chillers and coiled solvent tanks

[Shortburner]

Hey greywolf!!

Hey greywolf!!

Im curious about the self draining problem with the dual coils you advise against. I just picked up a 7/8"x145' stainless coil i was planning on putting on the out side of my haskel. Is there a problem with liquid staying on the one side of the coil if the system is a continuously operating system?
I figured the check valves and positive pressure would keep the pump safe.

 

[Pangea]

Did you ever do anything with your walk in freezer unit, Gray Wolf?

I have been thinking about putting something together similar to this glycol brew chiller unit: https://www.ssbrewtech.com/products/glycol

with a 2hp freezer condensing unit, such as this one: https://www.amazon.com/Tecumseh-Product-Co-AWA2479ZXDXC-2C2114-9/dp/B009PARE8C

I have no idea how to size the evaporator immersion coil though... Think I'd just pop it in a chest freezer filled with glycol.

seem like good specs on the condensing unit: http://www.tecumseh.com/~/media/Drawing-Data/North-America/CU-Data-Sheets/2C2114-1.pdf

1100w 'ish @ -40
1600w 'ish @ -20f

Was eyeing up the Johnson SPX CM90 pump, http://www.spxflow.com/en/johnson-pump-marine/pd-mp-marine-automotive-circulation-pumps-cm90bl/

The reg version is roughly $300ish, the brushless is $1000+

Not counting the evap coil, It could be put together for $2000 - $3000

Am I missing something? Seems to cheap and easy?

 

[Gray Wolf]

Im curious about the self draining problem with the dual coils you advise against. I just picked up a 7/8"x145' stainless coil i was planning on putting on the out side of my haskel. Is there a problem with liquid staying on the one side of the coil if the system is a continuously operating system?
I figured the check valves and positive pressure would keep the pump safe.

The problem with a double row of coils cooling pump exhaust, is that they are not self draining, so if vapors cool off enough to condense to a liquid, the liquid sits and makes the coil "putt." It blows enough liquid out of the way to release the gas and then the liquid falls back, again plugging the coil and making a putting sound.

If you are pumping chilled liquid through the coil under pressure, it doesn't matter how many rows of coils you have.

 

[Gray Wolf]

Did you ever do anything with your walk in freezer unit, Gray Wolf?

I have been thinking about putting something together similar to this glycol brew chiller unit: https://www.ssbrewtech.com/products/glycol

with a 2hp freezer condensing unit, such as this one: https://www.amazon.com/Tecumseh-Product-Co-AWA2479ZXDXC-2C2114-9/dp/B009PARE8C

I have no idea how to size the evaporator immersion coil though... Think I'd just pop it in a chest freezer filled with glycol.

seem like good specs on the condensing unit: https://www.tecumseh.com/~/media/Drawing-Data/North-America/CU-Data-Sheets/2C2114-1.pdf

1100w 'ish @ -40
1600w 'ish @ -20f

Was eyeing up the Johnson SPX CM90 pump, https://www.spxflow.com/en/johnson-pump-marine/pd-mp-marine-automotive-circulation-pumps-cm90bl/

The reg version is roughly $300ish, the brushless is $1000+

Not counting the evap coil, It could be put together for $2000 - $3000

Am I missing something? Seems to cheap and easy?

Sorry to say that building a new site and the time spent on legal defense has kept me out of the shop and I haven't worked on any projects for a bit.

Looks like your refrigeration plant and pump should work at -40C. You will also need the chiller coil and an expansion valve.

 

[Pangea]

Sorry to say that building a new site and the time spent on legal defense has kept me out of the shop and I haven't worked on any projects for a bit.

Looks like your refrigeration plant and pump should work at -40C. You will also need the chiller coil and an expansion valve.

That is very unfortunate, its one of the top issues with the patent war world, stifling innovation and forward progress by simply splitting the focus. Heres to hoping for a quick and just process!

I will be googling hard to find an appropriate coil and valve, thanks!

Also, fwiw, I went down a rabbit hole last night, found a former tech from polycold systems posting on diy cooling cpu forums. Very cool stuff, he lays out some awesome autocascading evaporator designs and mods, he turns a 5000btu window banger into -30 cold trap, but says you could easily modify it to -80!
http://www.xtremesystems.org/forums...phing-Air-Conditioner-into-Autocascade-System
Anyway, way over my level, but thought some folks here may enjoy!

 

[thcnology]

^This will work! Ask me how I know...

Why use refrigerant (404a)to chill a fluid (dynalene, for example) that you'll pump around to chill another refrigerant (r290, r600/a), when you can just chill one refrigerant with another?

The coil in the infinity coil tanks looks an awful lot like a larger version of the business end of a polyscience immersion chiller often used for cold traps in lieu of dry ice and acetone.

Coincidence???

How do you know..please tell Me more!

 

[nakadashi]

Any personal experiences with Across International chillers?

I'm needing roughly 25,000 BTU per recovery. to do this in one hour, I need 7,327 Watts @ 0C - say 7500 Watts to be safe.

Looking at the AI -30C chillers - one with a 30L reservoir; the other with 40L - I want to know if either of these actually perform near their specs. I'm afraid of spending an extra 5k on a chiller (40L reservoir) that hardly works any harder than the 30L.

To specs, the 30L allegedly handles 2800 Watts @ 0C, while the 40L should handle 5000 Watts @ 0C. These would take 2.6 hours and 1.5 hours to recover with, respectively. I definitely find that hour per run worth my time and investment, but I'm not trying to throw 12k at something I could have happily done faster with a little dry ice budget (and without the possibility of equipment failure)....I'm trying to avoid dewar fill-ups at the moment.

I thought about supplementing the chiller's work load with an ice or dry ice heat exchanger prior to the recovery tank, but almost all of the work load comes with actually condensing the butane. It would still help, but not sure how much.

Any help is madly appreciated. AI owners, speak up!

Other recommendations are welcome of course. I'm not 100% set on AI. They just have great availability and reasonable prices. Hooray China!

I set up a system with a 100lb solvent tank (coolant coil in tank + heat exchanger) with the AI -30 chiller, after about an hour of chilling the fluid reservoir was reading around -10C but after running/recovering about 10lb of tane it was up to about 1C. After condensing 20lb of tane, the coolant reservoir was reading ~15C. For cold solvent injection we ended up just using a dry ice bath with a coil like some other people here have suggested. So if you are looking to use the AI -30 for subzero tane injection it will probably need some assistance via dry ice/LN2. I would only use it to assist with recovery.