Food Freezing and Thawing Calculations

Beschreibung:

This item is printed on demand - Print on Demand Titel. Neuware -Freezing time and freezing heat load are the two most importantfactors determining the economics of food freezers. ThisBrief willreview and describe the principal methods available for theircalculation. The methods can be classified into analytical methods,which rely on making physical simplifications to be able to deriveexact solutions; empirical methods, which use regression techniques to derive simplified equations from experimental data or numericalcalculations and numerical methods, which use computationaltechniques such as finite elements analysis to solve the complete set of equations describing the physical process. TheBrief willevaluate the methods against experimental data and develop guidelineson the choice of method. Whatever technique is used, the accuracy ofthe results depends crucially on the input parameters such as the heat transfer coefficient and the product's thermal properties.In addition, theestimation methods and data for these parameters will be reviewed andtheir impacts on the calculations will be evaluated. Freezing is oftenaccompanied by mass transfer (moisture loss, solute absorption),super cooling and nucleation and may take place under high pressureconditions; therefore methods to take these phenomena into accountwill also be reviewed.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 168 pp. Englisch. Bestandsnummer des Verkäufers 9781493905560

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Reseña del editor: 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.