[TRNSYS-users] Stability criteria not fullfilled

[T. Tian]

Hallo Trnsys Usertrnsys-users,

I found one message from internet as blow:

"Actually with your defined wall ( heavy, very well insulated) the transfer function method reaches its limits.
We would suggest to simulate only the concrete part as thermal mass while the insulation part can be ".
As the insulation material has a low thermal mass this will not create a big error."

I am newbie with TRNSYS. Can someone explain to me this more: "simulated as resistance"? What should people do if the wall has more than 50cm insulation in Trnsys?

Thanks a lot