Depending on the ΔT needed to condense your gas, not sure the freezer will be able to maintain that 1° buffer.... I might try the easy option first and remove the thermostat, then have it cut out at -36 if it will go that low. I actually need -35 but a bit lower gives me a small margin, it wont be on all the time. ...
The way its condensed uses a alcohol or solvent as the liquid coolant, thermal mass wise 5Ltr of solvent cooled to -38C works for sure and more Chlorine than I am after at a time. If I did it with just an air jacket your probably right, the Delta T would be really scratchy.Depending on the ΔT needed to condense your gas, not sure the freezer will be able to maintain that 1° buffer.
Although, I suppose that if the freezer contained enough thermal mass(at -36°), it'd probably work fine.
I might try the easy option first and remove the thermostat, then have it cut out at -36 if it will go that low. I actually need -35 but a bit lower gives me a small margin, it wont be on all the time. I need it for cooling some things during low vac distills. It needs to cool a solvent down low enough to liquefy a gas I want anhydrous.
Just a random thought. Could a small peltier cooler placed in the existing freezer give you an even lower temperature?
Interesting idea, I dont know the answer.Just a random thought. Could a small peltier cooler placed in the existing freezer give you an even lower temperature?
Mike.
I will start with taking the thermo out for now, like I said the freezer wont be running every day so I am not too bothered about the compressor on it. Ambient temp outside the freezer is around 6C. The freezer is in the store room at the back of my lab, even this time of year when its 27C outside, inside its alot cooler.It will more than likely get there but it might take a while.
That would probably work pretty well for a smaller container.
The bigger issue would be the freezers actual capability to move heat. most are pretty weak and rely pretty heavy on just being well insulated.
Infact I just picked up a ~ 20 cubic foot freezer this week at an auction. Power input is ~ 100 watts so assuming a large temperature differential of say -30 F inside to +70F outside ambient I would have doubts that it could handle much more than 50 - 100 watts internal additive internal heat load which given Peltier units poor efficiency that would make for a pretty small secondary container to work with.
Upside is it could probably take a one quart metal can and its contents down to -100F or better if given enough time!
get yourself a foam gun (and some cleaner at the same time if you want to use it more than once). The control you get vs a simple can is incredible. Allows you to glue together & seal PIR sheets with good results.I got some kingspan sheets I can put inside the freezer to cust down the area it needs to cool and also help insulate it. I think off the top of my head they are 120mm thick.
I got some kingspan sheets I can put inside the freezer to cust down the area it needs to cool and also help insulate it. I think off the top of my head they are 120mm thick.
He talks about moving the evaporator coils/plates. Not sure how you'd make this frost free, but i don't that's a concern in this case.Putting insulation inside the freezer will diminish its cooling ability being the inside walls are where the heat absorbing evaporator tubes/coils are located. Or at least that where they are in US models.
If you ever noticed that when a freezer builds up ice on the inside it typically starts forming in bands that go along the sides. That where the tubes or coils that do the actual cooling run.
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