| http://www.w3.org/ns/prov#value | - Such systems cause mass transfer of the solid material by sublimation and frosting since therefrigerated air is in direct contact with the solid material.As described in the aforesaid copending application, in order to minimize mass transfer of the solid material, such as ice, due to sublimation and frosting, air or other suitable fluid is circulated in a circuit which is closed and effectivelysea
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