So other than lead time, what issue do you see with Mydax?
- They have a fair price
- American Made
- Proven in other industries since the mid 80s
- Options for extremely large scale
That’s actually an application I don’t know that much about to be honest. The lasers they use for sintering and such fall under the category we were speaking about with the Huber/Julabo options I thought. I guess it would make sense for a big plant running banks of them to use something larger.
I’m at a facility with the ProChillers crew talking about their M45 series of chillers. They’re filming the installation and would love the opportunity to answer any questions about the units configuration or capabilities. I’ll be asking about that high compression ratio first thing.
Awesome. We just placed an order with them.
Would love to see those videos!
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Spoke extensively with their reps and feel
Pretty good about the whole
Thing.
We’re primarily concerned about back pressure reducing to 1/2” from 2” ports but were told that won’t be an issue
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What are you attaching on the other end? How many load items? We’ve plumbed this chiller to multiple collection vessels, condensing coils, and material columns. So even though it has a wide bore supply and return into the extraction room at that point it branches out to manifolds with smaller supply and return lines.
Don’t worry the zip ties are not permanent
[quote=“SidViscous, post:16, topic:84813, full:true”]
With a 10C approach and 5C superheat, that’s an evap pressure of about 450 torr. To condense at 38C with 5c subcooling you’re at a discharge pressure of 14731 torr. Or a compression ratio of 32:1. Also running the evaporator at less than atmospheric which is generally poor form. And the vapor density is also really low.
[/quote]I’m most certainly not refrigeration expert and am glad to have smart people here to ask important questions. I’m now confident that this is not what’s occurring inside this unit. The M45 are indeed single refrigerant 404A systems with one compressor. It is a dual stage compressor; and the load shared between each being balanced allows each stage of compression to operate in an efficient range. In my head it was analogous to compound turbocharging of internal combustion engines where for a given amount of exhaust heat energy, a far greater pressure ratios can be achieved with two compressors in series than one alone.
The gents from ProChillers did a far better job of discussing these details than I can; I’ll be sure to share the video once they’ve edited and posted it.
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Looking forward to seeing that. Like I’ve said before, I really hope this need gets filled because the current options aren’t cutting it.
It looks like that is a single reciprocating compressor which is kind of a weird choice but maybe it is multi-stage internally? I’ll restrain my guessing if the manufacturer is just going to tell us how it works.
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Yes exactly. It is one compressor. Refrigerant enters through the top center of the compressor and is compressed. Discharges first stage, wraps around and enters the piston head is pumped on other side of piston through crankcase and out again. The guys went over the exact flow of refrigerant through the system and how the accumulator tanks work, I hope they’ll show all that they explained to me in the video, if they don’t, I’ll ask in even more detail when I go visit their facility and film my own video with all your follow-up questions. 
IIRC The system brought an entire EX80; eight 6x24 columns, two Exergy counter-flow coils, two internal solvent tank coils (under zero load; empty tanks) from 65F to -45F in approximately 45-50 minutes. I think it’s something like 70 gallons of Dynalene in the system, it’s got a ~40 gallon reservoir IIRC. Open bath which does present some… challenges.
For the little this comparison’s worth; a Huber Unistat 815 takes roughly 2 hours to bring four columns of this size to the same temperature. When it’s time to clean the columns, the Unistat is quick to thaw as they have two heater circuits. This system doesn’t have a heating capability, in case that’s something you’re looking for.
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