Chiller suggestions for Roto ?

Help Support and Requests
1

Can someone suggest to me what is the best solution to cool the condenser on a 20L roto ?

Right now I’m just using a water reservoir with ice which is miserable. What cooling solutions can I use to keep the condenser cold and keep it hold for hours while the hot vapors are liquefying?

Someone suggested a -80C chiller with a big reservoir. I got a quote for China for one for 8k before shipping or tarrifs

Which is much cheaper. I would like to go cheaper route, however I want to get the right tool that works

I’m all ears to suggestions

Edit: I know I said I want to go cheaper route but I’ll buy the right tool even if it’s on the pricy side. Will take any chiller suggestions

2

best solution is to match your cooling to your heating.

how much heat are you throwing at the problem?

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3

You need a chiller with about 2-3 tons of cooling for the 20L.

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4

the IP -100 has almost no cooling power at -80 it only has 35W, they are great units just not ment for large active loads.

building a glycol chiller out of an old AC unit is probably your cheapest bet.

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5

Anywhere from 90-120C

And overall I’ll take any chiller suggestions

6

Lauda is solid. I’ve got a 4600 for my 50L
You could go smaller and you don’t have to program it down to -10C
Set it to 0C and it will condense very well.
Double or single condenser?

If you go cheap you can always do a stainless coil in iso/dry ice dunk at condenser inlet (after the chiller thermo).

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7

There’s a LAUDA 4600 on eBay for $6k right now

8

Those are temperatures.

You need to match energy in to out.

You need watts, ergs,HP, calories, joules, or Btu to compare.

Edit: “tons” works for cooling, but I’ve never seen the conversion for heating

Check the plate on the side of your rotovap…

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9

VWR 1179 with turbine pump. U can find them used for good $. Same as a polyscience.

10

I spent a total of $650ish on a chiller that’s made from a fuel tank I insulated the daylights out of and mashed up with a 25.5k btu window ac unit- gets down to -30c can run it all day, temp never gets above -8c even under heavy load for hours.

Check thread pretty much all the data is there, if I ever need to cool a different system than my rotovap I just drop another submersible pump in and run lines.

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11

ive read that turbine pumps can have enough pressure to burst glass coils, if you cant regulate and dial the pressure back.