Re: [DIYbio] Re: DIY deep freezer from mini fridge?

CO2 is considered low risk for poisoning or asphyxiation as your body
readily detects elevated CO2.. in fact, it is elevated CO2 that gives
you that feeling that you need to gasp for more air. That's why nitrogen
or argon are considered hazardous, as you can breathe them without
realising you'll asphyxiate; you keep exhaling CO2 and inhaling no O2..

So, while CO2 is a significant explosion hazard if kept in a sealed
vessel, it's fairly safe from a poisoning angle.. provided you can walk
away from it and get some fresh air.

On 05/02/13 19:16, Avery louie wrote:
> I looked into getting a -80 setup for a while. Peltiers are expensive,
> tricky to run, and fickle without control electronics.
>
> One option may be to get a liquid nitrogen dewar (just a vacuum
> insulated vessel) and fill it with dry ice, which is almost exactly -80C.
>
> You could do it in a small thermos as a test. Just remember to let the
> sublimated CO2 escape and have it be well ventilated- you dont want CO2
> poisoning or explosions from pressure building up.
>
> --A
>
> On Mon, Feb 4, 2013 at 6:07 PM, Patrik D'haeseleer <patrikd@gmail.com
> <mailto:patrikd@gmail.com>> wrote:
>
> Not sure just dangling a Peltier element in sub-freezing air will
> tell us anything useful. The cold end will be directly exposed to
> ambient air, not to mention to the heat given off by the hot end.
>
> If you really want to see what is possibly, I would embed the cold
> end in a block of styrofoam, and attach a big heatsink on the hot end.
>
> On Monday, February 4, 2013 12:41:27 PM UTC-8, Sebastian wrote:
>
> Yes I do, its small and I'll run it off a 9v. I got a touchless
> laser thermometer that is pretty damn accurate and a traceable
> vwr metal probe thermometer. I,ll let u know asap.
>
> Sebastian S Cocioba
> CEO & Founder
> New York Botanics, LLC
>
> Sent via Mobile E-Mail
>
> On Feb 4, 2013, at 2:17 AM, Nathan McCorkle <nmz...@gmail.com>
> wrote:
>
> > On Tue, Jan 29, 2013 at 12:26 AM, Patrik D'haeseleer
> <pat...@gmail.com> wrote:
> >> The problem with Peltiers for this particular application is
> not so much
> >> being able to drive them, but that you're essentially putting
> a hefty heater
> >> inside your fridge, whihc is obviously not designed to be
> treated such.
> >
> > Is there someone in a cold part of the world who also has a
> peltier
> > that can measure how cold the cold side gets if you put it
> outside
> > when it's already 0 C?
> >
> > It's -3 C in New York City right now... Sebastian do you have a
> > peltier and a thermometer?
> >
> >
> > --
> > -Nathan
> >
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