The more I think about it, the more I become convinced that my bulk pellets were all wrong. The total surface area must have been enormous, and with no wrapping to reduce air circulation against that surface. I bet, if I had instead used the same weight of the more common blocks wrapped in wax paper, it would have lasted the whole week and then some.
The issue, methinks, is what exactly happens in that "atmosphere" inside the box. When we close the lid after putting the DI in, it's mostly air, and it's moving around a bit. Slowly the air is then replaced by CO2, a slight pressure builds up, and excess air/CO2 is vented thru the inevitable tiny gaps here and there. What's really in there, and going on in there, after a day? 99% CO2? Circulation caused by the "boiling" of the DI into CO2? Thermosyphon circulation?
Once I understand some of that, perhaps I can make improvements. I think somebody mentioned... filling empty space with blocks of styrofoam or some such.
Thoughts? Knowledge? Reasonably coherent theories?
taz666 wrote:Why is grey water removal such a problem?
gyre wrote:i used 50 lbs of dry ice in an 80+ quart igloo marine cooler with block ice and filled in with bits.
No insulation around the ice.
gyre wrote:As it dissolves it transfers the cold into the rest of the mass of ice.
I had solid dry ice for a long time, but usually only a day.
It still works to make things colder.
You aren't wasting energy until you reach absolute zero.
Thanks, Jesus! Good information, that! ...
illy dilly wrote:...Wouldn't you need to isolate the dry ice from the block ice?
gyre wrote:...You aren't wasting energy until you reach absolute zero.
illy dilly wrote:Jesus, thank you for backing me up.... Even I'm not sure I understand the whole second half.
So my theory is just put the dry ice in a zip lock bag to keep it from getting wet. Get a bag that's a little bigger so as the dry ice turns to vapor it has room to expand with out popping the bag.
Jesus? what do ya think?
I know my response to this post is 6 months late butJesus wrote:Dry ice brings the temperature of whatever is in contact with it down to -78 C (109 F).
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