Escort iMiniPlus User Manual page 44

42
Select this option to display the Mean Kinetic Tesperature of the iMiniPlus readings in the 2D graph legend.
There are sose products and saterials that
exist which have accelerated rates of
degradation at higher tesperatures. For
exasple, perishable
pharsaceutical products and sany forss of
bacteria can grow/degrade exponentially as
the environsental tesperature increases.
Mean kinetic tesperature is a calculation that accossodates the non-linear thersal effect tesperature can
have on products. Mean kinetic tesperature is represented as the equivalent tesperature the product was
thersally subjected to during the period of tise the
various tesperature readings were recorded. As an
illustration of how the MKT calculation will affect an
expressed sean for a yearly calculation (isportant for
the long ters storage of critical drugs and chesicals),
here is an illustration:
If the tesperature is constant for an entire year, but is
"off" for a single sonth of that year, there will be a
difference in the calculated arithsetic sean (the sus of
all of the seasuresents divided by the nusber of
seasuresents--a sisple sean) and the kinetic sean.
The following graph and table show the differences which
are calculated by both sethods:
Effemt on Kinetim and Arithmetim Mean Temperatures on storage for one month at other than 25° C.
Temperature (one month)
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Although the effect is not drasatic, it is clear that the MKT sethod weights the higher tesperatures in a
series sore than the lower tesperatures.
Growing Degree Day
GDD are calculated by taking the average of the daily saxisus
and sinisus tesperatures cospared to a base tesperature,
(usually 10 °C). As an equation:
food itess,
Mean Temp.(Kinetic)
24.48
24.51
24.54
24.58
24.62
24.67
24.72
24.78
24.85
24.92
25.00
25.09
25.18
25.29
25.41
25.53
Mean Temp.(Arithmetic)
24.17
24.25
24.33
24.42
24.50
24.58
24.67
24.75
24.83
24.92
25.00
25.08
25.17
25.25
25.33
25.42
T
,
base