Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

EnergyPlus Warning: reverse order construction

asked 2018-01-06 05:37:37 -0500

Jenny gravatar image

updated 2018-05-28 13:59:29 -0500

A warning is displayed in my simulation in EnergyPlus :

"GetSurfaceData: Construction DIVIDER WALL of interzone surface SURFACE 3 does not have the same materials in the reverse order as the construction DIVIDER WALL of adjacent surface SURFACE 16 * ~~~ * ...but Nominal U values are similar, diff=[0.0000] ... simulation proceeds. * ~~~ * ...if the two zones are expected to have significantly different temperatures, the proper "reverse" construction should be created ".

What does it mean? How can I solve it?

edit retag flag offensive close merge delete

2 Answers

Sort by ยป oldest newest most voted

answered 2018-01-06 10:06:03 -0500

Avi gravatar image

As it reads I am not sure you must change anything. Anyway if you would like to get reed of the warning you need to make a new construction , let's name it OPPOSITE DIVIDER WALL, and assign the same layers which form DIVIDER WALL just in opposite order. Now assign the the new construction to one of your surfaces 3 or 16 (but not both).

edit flag offensive delete link more


Thank you, you answer has been very valuable.

Jenny gravatar imageJenny ( 2018-01-06 15:08:20 -0500 )edit

answered 2018-01-07 21:30:29 -0500

updated 2018-01-07 21:30:39 -0500

Alternatively, if you create an interior wall construction that is symmetrical (i.e. gypsum, insulation, gypsum), I don't believe you will get this error and you don't need to create the "reverse" construction.

edit flag offensive delete link more


Thank you a lot for your answer! I solved the problem.

Jenny gravatar imageJenny ( 2018-01-20 04:02:21 -0500 )edit

By the way ..How did you solve this? can you please tell me?

Siva gravatar imageSiva ( 2018-01-23 11:39:57 -0500 )edit

I did as it is written in the first answer.

Jenny gravatar imageJenny ( 2018-02-02 05:44:55 -0500 )edit

Your Answer

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

Add Answer


Question Tools

1 follower


Asked: 2018-01-06 05:37:37 -0500

Seen: 75 times

Last updated: Jan 07