Is anyone able to run passive with freezer tek, meaning a bunch of chillers filled with ice pack gel and alcohol. It freezes solid and stays around-40f. I also have a 40Qt chiller pot before that. It’s outside filling and spilling from a spring that runs year round. Once I added the cold water chiller the freezer ones don’t unfreeze. My pumps are driving me nuts.
I was fighting bad gas from March to August, Cortland gas, soon as I changed gas we were back to normal. Then switched to bigger non jacketed tubes and was just sucking liquid gas into the pump when recovering, recked the bearings plus contaminated gas and product. Both my cmep pumps are fuct and I hate the trs21’s loud and hot!
Can you post some pics of your setup?
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Not at the moment. Buts it’s
2 lfe’s
1 30# recovery tank
1 60# recovery tank
3 4”/48” non jacketed tubes
2 3”/48” jacketed tubes
4”/18” jacketed crc lots of filters behind that.
2 injection coils in a tub
7 outlet manifold
2”/24” desiccant tube
Two freezer chillers with alcohol and freezer pack gel, it stays around-40f
One pre freezer chiller with just cold spring water.
One cold trap
One 12” 24” collection pot jacketed
And a pour pot 8”/12 but I don’t pour it has a sprayer line.
The system is hybrid.
The yearly operating cost should be the first thing anyone looks at when purchasing a system, not just what the system costs up front. Yea you can throw a million watts of heating and cooling at passive and move a fair amount of solvent but at the same time you can use pressure from a compressor to reduce the required thermal capacity to condense the gas by increasing the condensing temperature due to its pressure…
For instance, your refrigerator uses air for condensation by creating a high pressure gas that will condense at room temperature into a liquid. Then it depressurizes the liquid (still at room temperature) into the cooling elements where it creates cold relative to its pressure where it is then fed to the compressor inlet where the cycle repeats.
Simply put, a properly configured compressor will use less energy to do the same amount of work as passive - exponentially cheaper.
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At the given scale (for the sake of this argument 1-7 lbs/min), I totally agree. It’s worth sizing a system for a compressor.
Once your initial capital investment exceeds a certain number it’s worth exploring all options.
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Why so? I ran my first passive system without any inert gas like nitrogen.
At any volume, a compressor is better. We move 30# a minute with our compressor without much issue. 5-7# a minute is the same just a different compressor. The cooling capacity required for passive is exponentially greater than that of a compressor across the board.
Scaling no matter how you look at it will be easier with a compressor than passive. Simply by being able to increase the pressure you can use a warmer solution to condense the same solvent than would be at a lower pressure for the same volume.
This is not possible with a passive system. In this case you are forced to operate at the boiling point of the solvent as the condensing pressure for the same. This is not efficient in any way. Otherwise, why does your refrigerator or air conditioner not run passively?
Even when you break down and buy a bad ass chiller to stay at -90c, you are still using a compressor to get cold. Without a compressor, a passive system won’t work on a chiller based model. CO2 or LN2 are then required to avoid compressors completely.
how many amps(horsepower) compression, plus how many kw heat, and any extra chilling for 30#/min (i assume full propane)
the only time ill bow to a compressor is for deep chilling
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The compressor we use has a 30HP 3-phase motor and we typically supply a 32kw heater though only a portion of it is ever utilized and never operates at 100% capacity. The chiller is oversized so as to condense the vapor from two compressors at once for our latest Pro-Jacket upgrade which gives the user on demand thermal control from -50c to +50c within minutes.
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Had to share cause Im so stoked.
Just got a deal for 50 cents USD/ Lbs! I dont know what Im going to do with myself, going to be bathing myself in dry ice! I never thought I’d be able to put a recovery tank directly in a DI slurry, Im going to be ripping!
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Getting a good price on dry ice is an absolute fucking game changer.
Much love @midsfactory
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