1. Introduction
Vacuum cooling is one of the most enhanced food
refrigeration processes that meet the requirements for
cooling rate of ready meals and their components. McDonald
and Sun (2000) recently provided a review of the
utilisation of this process in the food processing. One
of the vacuum cooling advantages is that the heat is
removed from food volume due to the evaporation of
water vapour from the food piece pores (Sun, 1999).
Some recent results on vacuum cooling modelling were
summarised by Houska, Bartos, Hoffman, and Sestak
(1999). It was found that the process can accurately be
simulated and its temperature history predicted provided
this reliable data for the product of mass transfer
coefficient and mass transfer surface are known.
Quick cooling is very important for cooked products
and semiproducts destined for preparing chilled or frozen
ready meals. It is essential, for these food materials,
to disable the potential growth of spores of sporeforming
pathogenic micro-organisms germinated after
gentle cooking. If the products are slowly cooled down,
1. IntroductionVacuum cooling is one of the most enhanced foodrefrigeration processes that meet the requirements forcooling rate of ready meals and their components. McDonaldand Sun (2000) recently provided a review of theutilisation of this process in the food processing. Oneof the vacuum cooling advantages is that the heat isremoved from food volume due to the evaporation ofwater vapour from the food piece pores (Sun, 1999).Some recent results on vacuum cooling modelling weresummarised by Houska, Bartos, Hoffman, and Sestak(1999). It was found that the process can accurately besimulated and its temperature history predicted providedthis reliable data for the product of mass transfercoefficient and mass transfer surface are known.Quick cooling is very important for cooked productsand semiproducts destined for preparing chilled or frozenready meals. It is essential, for these food materials,to disable the potential growth of spores of sporeformingpathogenic micro-organisms germinated aftergentle cooking. If the products are slowly cooled down,
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