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Advisor(s)
Abstract(s)
Experimental time±temperature distributions from two di erent industrial scale retort systems were statistically analysed. The
retort temperature was modelled as the sum of a trend value and a residual, with the trend temperatures being simple functions of
time. The residuals were modelled using time-series. The resulting impact on the lethality distribution was assessed by calculating the
F-value distribution in the centre of cans simulated via a conduction-heating ®nite element model for 180 simulated temperature
histories. Comparing the distributions obtained with those calculated using the actual experimental temperature histories validated
the applicability of this approach. The results indicated that the experimental and the modelled average lethalities were statistically
similar at 95% con®dence. The standard deviation was also similar for the F-value up to the end of holding but larger for the
modelled distribution when considering the whole cycle, which was attributed to a correlation between the heating and cooling
parameters that was not considered in the model.
Description
Keywords
Conduction-heating Mathematical modelling Finite elements In-pack sterilisation Time-series
Citation
VARGA, Szabolcs...[et al] - temperature variability in batch retorts and its impact on lethality distribution. Journal of Food Engineering. ISSN 0260-8774. Vol. 44 (2000), p. 163-174
Publisher
Elsevier