Heat transfer model performance in simulation of process deviations
Teixeira, A.; Balaban, M.; Germer, S.; Sadahira, M.; Teixeira-Neto, R.; Vitali, A.
Journal of food science 64(3): 488-493
ISSN/ISBN: 0022-1147 DOI: 10.1111/j.1365-2621.1999.tb15068.x
Performance of thermal process simulation software was tested for predicting internal product temperature and lethality. Responses were tested for process deviations on canned products with a wide range of heating characteristics for computer-based on-line control of retorts. Static and agitated processes were tested with products exhibiting heating rate factors (fh) ranging from 2 to 70 min. Cans were fitted with thermocouples and subjected to deviations of various types. Center temperature profiles and lethalities predicted by the model in response to dynamic retort temperatures were compared with those measured by thermocouples. Profiles agreed, and process lethalities calculated from predicted and measured profiles agreed +/- 10% with the model slightly underpredicting measured lethality.