Comparing Air Blast and Fluidized Bed Freezing
Objectives And Learning Outcomes
To learn the freezing process with this type of freezer and how to control this operation.
To verify the existing correlations’ accuracy on the prediction of food freezing times.
Emphasis On Environmental And Safety Aspects
The students learn in this laboratory class the way the refrigeration machine works with special emphasis to the kind of refrigerant used, 134a, stressing the fact that Freon 12 was the former refrigerant used, which was very harmful to the environment, namely the ozone layer and therefore had to be replaced some years ago.
Freezing is a unit operation where the temperature of the food is decreased below its freezing pointfreezing point and during which part of the water content changes of state, forming ice crystals (generally in foodstuff frozen at –29°C about 90% of the water content is frozen). The immobilization of water in ice and the consequent concentration of the solutes solved in non-frozen water,...
KeywordsLatent Heat Food Item Freezing Time Meat Ball Plank Equation
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