Cool!
Harry
On Fri, Jan 21, 2022 at 4:21 PM MSF wrote:
>
> How to make dry ice with a fire extinguisher:
>
> https://www.youtube.com/watch?v=tLNHDxd6nDc
>
> How to make dry ice with a paintball tank:
>
> https://www.youtube.com/watch?v=L7U2CbxfMMk
>
> ‐‐‐ Original Message ‐‐‐
>
> On
Harry
Another surprising source of cold air would be from the Ranque-Hilsch vortex
tube. The problem is that the vortex tube is not very efficient since the hot
side flow is usually wasted.
It might be possible to combine a parabolic reflector with a vortex tube in
series if one needed
Here is a similar investigation using parabolic and elliptical reflectors
and also a simple reflector with flat sides sloping at 45 degrees. With the
parabolic reflector they managed to a cool an emitter 20 degrees below
ambient temperature at night. The elliptical reflector was almost as good.
Sorry please forget that question.. I forgot that my mail from vortex was
going into a separate folder.
Harry
I wrote:
> btw, when I reply to a message the vortex list does not return my
> reply so I have to check the website
> to see if it was received. Is this normal now?
>
>
Whoa Jones!
If the sky can be considered a cold dome, and if frigorific radiation
follows the rules of geometric optics
then when an elliptical reflector is pointed at the sky this is
similar to placing a cold body at the reflector's near focus F1.
The cooling rays that happen to pass through
On Fri, Jan 21, 2022 at 8:24 PM William Beaty wrote:
>
>
> Buy slab-type, slabs kept in a stack to avoid internal convection.
>
> Buy an Al mylar "space blanket" and wrap the slab-stack in many layers.
>
> Best is to store the whole thing in a thick styrofoam box placed inside
> a bigger
On Fri, Jan 21, 2022 at 8:30 PM William Beaty wrote:
>
> On Thu, 20 Jan 2022, H LV wrote:
>
> > Does anyone here have experience transporting and storing dry ice?
>
> First, call the seafood section of any local supermarket, and ask if they
> sell dry ice. If they don't, they probably know who
On Fri, 21 Jan 2022, MSF wrote:
It seems as if you are going to do some serious experimenting, and would
have to make that 5 hour trek more often than you would like. You could
save yourself a lot of time and gasoline if you just made your own dry
ice.
If the dry ice is coming from a
On Thu, 20 Jan 2022, H LV wrote:
Does anyone here have experience transporting and storing dry ice?
First, call the seafood section of any local supermarket, and ask if they
sell dry ice. If they don't, they probably know who does (since people
know to call seafood suppliers when searching
Buy slab-type, slabs kept in a stack to avoid internal convection.
Buy an Al mylar "space blanket" and wrap the slab-stack in many layers.
Best is to store the whole thing in a thick styrofoam box placed inside
a bigger drinks-cooler.
Doing that, you can make 20lbs last for over a week.
How to make dry ice with a fire extinguisher:
https://www.youtube.com/watch?v=tLNHDxd6nDc
How to make dry ice with a paintball tank:
https://www.youtube.com/watch?v=L7U2CbxfMMk
‐‐‐ Original Message ‐‐‐
On Friday, January 21st, 2022 at 8:08 PM, MSF wrote:
> It seems as if you are
It seems as if you are going to do some serious experimenting, and would have
to make that 5 hour trek more often than you would like. You could save
yourself a lot of time and gasoline if you just made your own dry ice. It's
pretty simple. You can buy the whole setup. It's basically a canvas
Of interest:
https://www.researchgate.net/publication/262806145_Blue_Sky_Cooling_for_Parabolic_Trough_Plants
Thanks. The same supplier also makes liquid nitrogen, although if I
use liquid nitrogen then I would have to buy a special vessel.
For a few years now I have been thinking about redoing a key
experiment in the development of radiation theory and then following
it up with an experimental
When transporting or storing dry ice, styrofoam is your friend. A Dewar flask
would be preferable, but only thermos bottles are commonly available, and a lot
of them are no longer Dewars. A styrofoam cooler would probably make your dry
ice last the 2 1/2 hour trip as long as it's full. Large
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