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Jose A. Rabi, Fernando L. Caneppele
(2018)
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Computer Applications in Engineering Education, 26(5)
10.1002/cae.21933Blast-cooling of beef-in-sauce catering meals: numerical results based on a dynamic zero-order model
Faculty of Animal Science and Food Engineering, Federal University of São Paulo , São Paulo , Brazil
Irstea, UR GPAN, 1 rue Pierre-Gilles de Gennes France
Agence Nationale de S´ecurit´e Sanitaire de l’Alimentation, de l’Environnement et du Travail, Laboratoire de S´ecurit´e des Aliments France
AgroParisTech / Institut National de la Recherche Agronomique, UMR1145 Ing´enierie Proc´ed´es Aliment France
Published: 18.10.2014.
Volume 3, Issue 2 (2014)
pp. 213-217;
Abstract
Beef-in-sauce catering meals under blast-cooling have been investigated in a research project which aims at quantitative HACCP (hazard analysis critical control point). In view of its prospective coupling to a predictive microbiology model proposed in the project, zero-order spatial dependence has proved to suitably predict meal temperatures in response to temperature variations in the cooling air. This approach has modelled heat transfer rates via the a priori unknown convective coefficient hc which is allowed to vary due to uncertainty and variability in the actual modus operandi of the chosen case study hospital kitchen. Implemented in MS Excel®, the numerical procedure has successfully combined the 4
th order Runge-Kutta method, to solve the governing equation, with non-linear optimization, via the built-in Solver, to determine the coefficient hc. In this work, the coefficient hc was assessed for 119 distinct recently-cooked meal samples whose temperature-time profiles were recorded in situ after 17 technical visits to the hospital kitchen over a year. The average value and standard deviation results were hc = 12.0 ± 4.1 W m−2 K −1 , whilst the lowest values (associated with the worst cooling scenarios) were about hc ≈ 6.0 W m−2 K −1 .Convective heat transfer
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