LogTag Recorders LogTag Analyzer Temperature Recorder - Manual (Page 73)

Chapter 5 Results from LogTag 73
Mean Kinetic Temperature
Some products and materials have accelerated rates of degradation at higher
temperatures. For example, perishable food items, pharmaceutical products and many
forms of bacteria can grow/degrade exponentially as the environmental temperature
increases. Mean kinetic temperature is a calculation that accommodates the non-linear
thermal effect temperature can have on products. Mean kinetic temperature is
represented as the equivalent temperature the product was thermally subjected to during
the period of time the various temperature reading were recorded.
Mathematically the formula for calculating the mean kinetic temperature can expressed as
illustrated in the following picture:
Where:
mkt Mean kinetic temperature, in degrees Celsius
the activation energy. By default LogTag Analyzer uses
an activation energy value of 83.144 KJ/mol for the
calculation.
You can select a custom value for ΔH by clicking the
button in the Summary Statistics or Chart
Statistics option screen and entering the desired value.
Charts and the Statistics page display the ΔH parameter
if it is different to the default value:
R the universal gas constant, which is 0.0083144 KJ/mol K