Abstract
Inexpensive removal of low-pressure water vapor is an essential requirement for economically attractive direct freeze concentration. The currently used method is condensation on a chilled metal surface rinsed by a recirculating saline solution. Although simple condensation is inexpensive on a large scale, the requirement of a large condensing surface and low capital cost lead to poor heat transfer, especially for facilities less than about 20 kg/h. An alternative approach is to combine condensation with mechanical compression, but little information is publicly available that can be used to determine the feasibility of this approach. Our measurements of condensation rate in a chilled liquid ring (LR) vacuum pump show that correlations for smooth films do not describe condensation in these pumps. The measured condensation rates indicate that LR pump compression does not substantially increase condensation.
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