Modeling Adjacent Walls with Different Materials

asked 2024-03-04 10:41:26 -0500

856 ●7 ●8

updated 2024-03-04 15:31:09 -0500

Hello Community,

I'm encountering a challenge while modeling two zones where the adjacent walls have different materials. I've set the boundary conditions as surface conditions, but upon running the simulation, I receive an error indicating that the adjacent walls do not have the same materials. I also found out that the adjacent walls must have the same number of layers and the same surface area.

Could someone please advise on how to resolve this problem? Is there a specific approach or workaround that I might be overlooking? And please correct me if I'm wrong.

Any insights or suggestions would be greatly appreciated.

Thank you in advance for your assistance.

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answered 2024-03-05 06:08:00 -0500

Denis Bourgeois
2081 ●81 ●8 http://www.rd2.ca

@Zakaria, interzone walls must indeed share the same vertices (in reverse order from each other), and their constructions must share the same number of layers. Yet as stated here, both constructions must also share the same multilayered materials (in reverse order from each other if asymmetrical), e.g.:

Wall A

layer 1: 16mm cement board
layer 2: 140mm mineral wool insulation
layer 3: 13mm gypsum board

Wall B

layer 1: 13mm gypsum board
layer 2: 140mm mineral wool insulation
layer 3: 16mm cement board

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answered 2024-03-05 00:40:20 -0500

bentan

21 ●4 ●3

Have you try checking [this]?(https://unmethours.com/questio...

I don’t think it will be possible for the adjacent wall to have different materials, the adjacency will not be solved.

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Agree. It's not 100% clear from the original question whether @Zakaria intentionally wants dissimilar materials between adjacent surface constructions (not possible IMO), or if the error is unintentional.

Denis Bourgeois ( 2024-03-05 08:09:58 -0500 )edit

Dear Denis Bourgeois,

Thank you for your answer.

My question is based on an old one (here) where I want to model an indoor walk-in freezer (walk-in within a construction). You have noticed the question that EnergyPlus doesn't like cutouts, and one solution is to model the walk-in construction surrounded by the other zones here. That is why I want to define different materials for the adjacent wall.

Zakaria ( 2024-03-11 13:17:44 -0500 )edit

@Zakaria, based on the layout you shared, each perimeter zone should have 1x wall (adjacent to the "Walk-in Zone") referencing a 2-layer construction: (1) "foam", then (2) "brick" (from outside to inside). The "Walk-in Zone" should have 4x walls referencing another construction: (1) "brick", then (2) "foam".

Denis Bourgeois ( 2024-03-12 03:37:23 -0500 )edit

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