2/15/2023 0 Comments Dry ice rate of sublimation![]() At ambient temperatures above -101F (of whatever the sublimation temp is), the vapor pressure of CO2 is much higher than will be contained in the freezer. Putting the block in the freezer WILL NOT STOP SUBLIMATION due to partial pressure of CO2. Make sure each block is the same shape and weight. Place each one on a similar surface, idealy have each on a styrofoam base, so that the heat losses from the surfaces are similar (if one is on a steel surface, it will melt faster than the other). Create the same barrier for the one in the room (in case the barrier is insulating the ice - now each will have similar insulation). Put up a protective barrier that will protect the ice from the wind yet will allow the air around the ice to be be at the same or similar temp to the air in the freezer. This will increase the heat transfer rate to the block of dry ice. While the compressor is running, a fan blows air over the coils and into the freezer. If you want to try it experimentally, do these things to make sure you are eliminating other variables: The higher temperature gradient outside of the freezer will cause a higher rate of heat transfer, therefore a higher sublimation rate. ![]()
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