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PU for tunnel pasteurization by stages

In a tunnel pasteurizer the product passes through several zones at different temperatures. Add up to three stages and the calculator sums the PU from each.

Parameters

Result

Approximate calculation using a simplified model: for designing equipment and process modes, consult a technologist.

Calculation example

Mode
PU by profile (up to 3 stages)
Temperature (stage 1)
55 °C
Holding time (stage 1)
10 min
Temperature (stage 2)
62 °C
Holding time (stage 2)
12 min
Temperature (stage 3)
58 °C
Holding time (stage 3)
8 min
Pasteurization units accumulated
29,3 PU
PU per minute at the stage 1 temperature
0,191 PU/min

Frequently asked questions

How is PU calculated for several zones?
The PU of each zone is calculated separately (time × 1.393^(T − 60)) and summed.

The calculations are approximate: they help to assess the process and compare options, but do not replace a process design and trials on a specific raw material. This section is for reference only and contains no commercial offers.