WOLFRAM|DEMONSTRATIONS PROJECT

Equivalent Isothermal Time at a Reference Temperature as a Function of Time

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temperature profile parameters
initial temperature control
20.
target temperature
120.
maximum heating rate
0.5
maximum cooling rate
1.15
mid heating time
6.
mid cooling time
20.
cooling water temperature
15.
minimum product-water temperature difference
5.
Weibullian rate parameters
lethal temperature marker
102.45
lethality rate factor
0.309
Weibullian concavity parameter
0.35
isothermal reference temperature
121.1
This fifth of five Demonstrations depicts the change in the equivalent isothermal time versus the process time (in minutes) for a chosen temperature history and reference temperature. The equivalent isothermal time is the time at the selected reference temperature that will produce the same degree of inactivation as the chosen process. This is done by setting eight temperature profile parameters, three Weibullian heat resistance parameters, and the isothermal reference temperature. Notice the automatic scaling of the
y
axis; it is different in each example.