On Fri, Jan 21, 2022 at 8:24 PM William Beaty <bi...@eskimo.com> 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 drinks-cooler. > > Doing that, you can make 20lbs last for over a week. >
Great! > While driving, blow outside air or keep windows cracked, so you DON'T DIE. > (Usually this isn't a big issue, since when done right, the offgassing > will be low. People only die when they try using paper bags to transport > many cubic feet of pellet-type, in hot desert environment (with car > sealed, with air conditioning on "recirculate," and with air flowing > through the pellets.) > Ok. Good advice. > For Burning Man, I took 30lbs in a DIY chamber made from many layers of > foil-coated 1/2" styrofoam, for walls 6in thick. I was sitting all day > in Center House, handing out chips so people could cool their drinks. > The only problem was with hot wind storms, where my big box was outside > the tent. Tiny tiny air leaks acted like blow-torches, carving little > slots in the surface of my slab-stack. (That's when I started wrapping > the whole thing in reflective mylar.) Jones's link on 'blue sky cooling' gave me another idea. It seems to me the sky could be used as a cold supply instead of placing some sort of cold material at the first focus of the ellipse. I will explain my cartoon reasoning in a follow up post ;-) The sky wouldn't have the same cooling power but it might be enough to reveal the existence of cooling rays. Harry > > On Thu, 20 Jan 2022, H LV wrote: > > > Does anyone here have experience transporting and storing dry ice? > > If you keep it stored in an ordinary freezer how long will ice cube > > sized pieces last? > > The closest supplier I can find is a 2.5 hour drive away. Will it even > > last 2.5 hours if stored in a cooler or thermos bottle? Would larger > > chunks be better? > > Thanks. > > > > Harry > > > > (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) > William J. Beaty SCIENCE HOBBYIST website > billb at amasci com http://amasci.com > EE/programmer/sci-exhibits amateur science, hobby projects, sci fair > Seattle, WA 206-762-3818 unusual phenomena, tesla coils, weird sci >
