EAN: 9781493905560

SPRINGERBRIEFS IN FOOD HEALTH AND NUTRITION F...

Freezing time and freezing heat load are the two most important factors determining the
economics of food freezers. This Brief will review and describe the principal methods available
for their calculation. The methods can be classified into analytical methods  which rely on
making physical simplifications to be able to derive exact solutions  empirical methods  which
use regression techniques to derive simplified equations from experimental data or numerical
calculations and numerical methods  which use computational techniques such as finite elements
analysis to solve the complete set of equations describing the physical process. The Brief will
evaluate the methods against experimental data and develop guidelines on the choice of method.
Whatever technique is used  the accuracy of the results depends crucially on the input
parameters such as the heat transfer coefficient and the product's thermal properties. In
addition  the estimation methods and data for these parameters will be reviewed and their
impacts on the calculations will be evaluated. Freezing is often accompanied by mass transfer
(moisture loss  solute absorption)  super cooling and nucleation and may take place under high
pressure conditions  therefore methods to take these phenomena into account will also be
reviewed.

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