[TRNSYS-users] stability criteria not fullfilled

[Hartl Michael]

Dear TRNSYS-users,
 
I'm struggling to create some wall types for a multizone building.
 
I get the message:
 
"error creating the wall transfer function coefficients:
 
 stability criteria not fullfilled
 
 check layer definitions (thickness, ratio of conductivity/density)"
 
Of course, I have already re-checked the layer definitions.
 
This message appears for wall types with quite a massive layer (e.g. bricks 0.53m) and an additional insulation (e.g. up to 0.16m). Also it appears when modelling the uppermost slab with a layer of wood (e.g. 0.20m) and insulation (e.g. 0.16m).
 
Unfortunatelly I couldn't figure out yet how to create these kind of wall types without having the error message.
 
I appreciate any suggestions,
 
Michael
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