The first row is for determining whether to use HIGH or LOW k-values. Each row afterwards corresponds to a heat path.
The basic format for each row after is:
area,length,material1,material2,pressure,
If the path involves just material resistance, leave the material2 and pressure parameters blank:
area,length,material1,,,
If a heat path travels through multiple paths, keep them on the same row:
area1,length1,material1,material2,pressure1,area2,length2,material3,material4,pressure2,
If no length was given, by default, use 1.
For example files, please look in the test directory in this repository.