Thermal Conductivity varying with input temperature

Hi all,

I'm trying to create a thermal conduction block to use in a simscape model for a cylindrical pipe, therefore the fourier law equation will be in cylindrical and not for a flat plate. I also want to use the input temperature at port A to calculate thermal conductivity from an equation based on the material properties.

The block has been modified from simscape standard 'branch' and 'conduction' models.

I have put the thermal conductivity 'th_cond' as a variable and an equation has been used to calculate the thermal conductivity.

When i try and build the simscape library usin the 'ssc_build' command i get the following error. Any help would be appreciated

Failed to generate 'pipe_model_lib'

Caused by:

Error using pipe_model.conductionpipe_SSteel>equations (line 32)

Type mismatch for equation. The left hand side of the equation is {[1x1 double],

'W/(m*K)'} and the right hand side of the equation is 35.

th_cond = {[1x1 double], 'W/(m*K)'}

Answer 1

[Juan Sagarduy]

Hi Alex

An easy way to solve this by defining the equation: th_cond == a+b*T1.

Parameters a and b shall be defined with a consistent unit: a[mW/(m*K)] and b[mW/(m*K^2)].

Then it should be alright. You can even make a and b protected parameters.

Br Juan

[Aled]

Thanks Juan, the error is now gone :)