TCi Operator Manual
35
Example of a failing blotter test:
4.7
Indirect Property Calculations
Several properties can be determined indirectly from test results using the C-Therm TCi software.
The derived properties are displayed in the results grid of a test. Below are the theoretical base
calculations that are used for the software calculations.
Diffusivity is determined from the equation:
Cp
k
[m
2
/s]
Where
α
is the diffusivity,
k
is the thermal conductivity,
ρ
is the density, and
Cp
is the heat
capacity. The density must be entered for this value to be calculated. The heat capacity can be
entered or calculated if the density has been entered.
Heat Capacity is determined from the equation:
k
e
C
p
2
[J/kg·K]
Where
Cp
is the heat capacity,
e
is the effusivity,
k
is the thermal conductivity, and
ρ
is the
density. The density must be entered for this value to be calculated. Both thermal conductivity
and effusivity calibrations must be available for this value to be calculated.
The R-value is determined from the equation:
k
l
R
[m
2
K/W]
Where
k
is the thermal conductivity and
l
is the material thickness (the depth of penetration). This
property is only applicable to insulative materials.
The depth of penetration is determined form the equation:
Summary of Contents for TCi
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