![]() ![]() Thanks for any insight or help that anyone may provide!ĭear Safety, the driving force for sublimation is a heat flux which is approximately proportional to temperature gradient dm/dt=K(T2-T1). ![]() The physical properties of the dry ice is at this link. I would assume that the sublimation rate may be slowed at -10F vs 75F, but is it significantly different? Is there really any significant reason to store the dry ice in the freezer? The only advantage that I can think of is that the cooling effect of the dry ice may help the freezer and provide some efficiency gains and it may slow the sublimation rate, however there is a distinct safety disadvantage as the dry ice sublimates to gas in the enclosed area. The sublimation point of the dry ice is -109.3F. I can't find any documented information on this difference, I have found information about the sublimation rate being between 1 and 2% per hour. ![]() I am interested in calculating the difference in the rate of sublimation at -10F versus in the warehouse at 75F. ![]() I do not know of any freezer that can hold the dry ice below -109.3F. Dry ice manufacturers that I have been too in the past do not have freezers, they simply store it in coolers and ship it immediately. I think somebody was thinking it would hold the dry ice longer in the freezer than in the warehouse. They aren't sure exactly why they stored the dry ice in the freezer (-10F), other than that is the area that they do the packing of the portable coolers. They have moved a majority of the dry ice out of the enclosed area of the freezer. They are in the process of renting sampling equipment to measure the levels, and long term if they are going to keep using the dry ice, they will be looking at installing fixed monitors with alarms. They have been storing the dry ice in their deep freezer (15000 lbs +) and now have some complaints of CO2 exposure symptoms. I have a location that uses dry ice for portable coolers on their delivery trucks. Hello, this is my first post to this forum. ![]()
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