Re: [DIYbio] Freezer colder than -20C, but warmer than -80C

Have you or someone else constructed a liquid N2 generator successfully?

I don't suppose you are suggesting building something similar in sophistication to one from a commercial brand (which seem to go for ~2.5K minimum)
(An exception was this item on Ebay for < 1.5K which is still a little more than what I'd want to pay without knowing this is 100% going to work for at least a few years' time)

OR

Are you suggesting something more rudimentary in design, but perhaps nearly as effective as the more fancy ones?

From this example YouTube link, my understand is that I'd need at the very least these components:
  • air compressor
  • nitrogen filter - filter sounds expensive....
  • cryo pump - most pricey?
  • liquid N2 dewar (I have that already)
hmm.... those together will easily cost > 1.5K.

So, perhaps I should stick with buying liquid N2 from my local AirGas or Praxair branch? :)
Which happens to be much cheaper than using dry ice....



On Mon, Apr 12, 2021 at 8:38 PM S James Parsons Jr <sjamesparsonsjr@gmail.com> wrote:
Make a liquid nitrogen generator

Sent from my iPhone

> On Apr 12, 2021, at 7:02 PM, Dakota Hamill <dkotes@gmail.com> wrote:
>
> No idea, but would honestly love to know out of all the temperatures
> that could have been chosen, why -80C and -20C are the standards.
>
>> On Mon, Apr 12, 2021 at 5:54 PM Tom De Medts <tdmedts@gmail.com> wrote:
>>
>> Dear all,
>>
>> Is it possible via DIY engineering to design and build
>> a freezer that is colder than -20C, but warmer than -80C.
>>
>> -20C freezers are relatively inexpensive
>> and
>> -80C freezers are way more expensive, also large in size, requiring maintenance plans
>>
>> I want to know whether there is something in between....
>>
>> Thanks!
>>
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