Numerics problem related to roof with airlayer
Posted: Thu Jan 07, 2021 5:53 pm -1100
Hi, I am trying to simulate the metal roof system with the air layer.
However, the numerics problem always exists.
I have attached the assembly: metal deck - air layer - polyisocyanurate board - metal deck
Most of the settings are kept as default, such as surface transfer coefficient, initial conditions.
The weather of Auckland, NZ from the database is applied as the indoor and outdoor climate.
After the calculation, a lot of convergence failures showed up, and balance 1 and balance 2 are in incredible difference.
I have tried using the adaptive time step, doesn't work.
I have tried using air layer without moisture capacity, doesn't work.
I have tried using surface sd-Value instead of actually insert the metal deck, doesn't work as well.
It is driving me crazy, please help!
Thank you so much
However, the numerics problem always exists.
I have attached the assembly: metal deck - air layer - polyisocyanurate board - metal deck
- assembly.jpg (70.37 KiB) Viewed 6097 times
- sur.jpg (69.22 KiB) Viewed 6097 times
After the calculation, a lot of convergence failures showed up, and balance 1 and balance 2 are in incredible difference.
- numerics.png (22.83 KiB) Viewed 6097 times
I have tried using air layer without moisture capacity, doesn't work.
I have tried using surface sd-Value instead of actually insert the metal deck, doesn't work as well.
It is driving me crazy, please help!
Thank you so much