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.
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
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?
>
>
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
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
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
7 matches
Mail list logo
