I am getting a warning that says: "Both surfaces 'Surface 1', and 'Surface 2 reference the same construction 'Wall Interior 1' but it is not symmetric, creating a reversed copy." What does this mean?

asked 2017-07-13 08:37:42 -0600

Student
187 ●1 ●7

updated 2017-07-13 08:52:35 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

I saw a similar error asked by someone else but there was no explanation as to why this error comes up.

This error came up when I translated my openStudio model to EnergyPlus. What does this error mean? Is there anything I can do to fix it?

Thanks.

answered 2017-07-13 08:45:52 -0600

Student
187 ●1 ●7

I just realized why this error occurs. It happens when a custom construction material is hard assigned to 2 surfaces that are touching. To fix it, delete one of the hard assigned construction materials from one of the surfaces. The program will automatically pick up the construction from the surface's 'outside boundary condition object'.

edit flag offensive delete link

Comments

The problem is not with custom constructions specifically, it's with asymmetric constructions, i.e., constructions with material layer orders that are not the same when read from one side vs. another. If you assign asymmetric construction ABC to matched surfaces in zones 1 and 2, you create an impossible/ambiguous situation. The construction must look like ABC from zone 1 and CBA from zone 2 or vice versa. It cannot look like ABC from both zones. If only one surface is assigned ABC, EnergyPlus automatically creates the CBA construction and assigns it to the matched surface.

__AmirRoth__ ( 2017-07-13 09:06:40 -0600 )edit

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

I am getting a warning that says: "Both surfaces 'Surface 1', and 'Surface 2 reference the same construction 'Wall Interior 1' but it is not symmetric, creating a reversed copy." What does this mean?

1 Answer

Comments

Your Answer

Training Workshops

Careers

Question Tools

Stats

I am getting a warning that says: "Both surfaces 'Surface 1', and 'Surface 2 reference the same construction 'Wall Interior 1' but it is not symmetric, creating a reversed copy." What does this mean? edit

1 Answer

Comments

Your Answer

Training Workshops

Careers

Question Tools

Stats

I am getting a warning that says: "Both surfaces 'Surface 1', and 'Surface 2 reference the same construction 'Wall Interior 1' but it is not symmetric, creating a reversed copy." What does this mean?