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EnergyPlus Starting coordinate setup for adiabatic ceiling and floor

asked 2023-05-05 06:53:36 -0500

Louis W's avatar

updated 2023-05-07 07:23:43 -0500

Hi there, I have a model of a single-story building, and for research purposes I want to minimize the heat transfer from the roof and floor of the building, so I thought of setting it to be adiabatic. I know from the error file of the simulation result that I may need to set the coordinates:

** Severe  ** Ceiling:Adiabatic="CA1", Too few number of numeric args=[0].
** Severe  ** Ceiling:Adiabatic="CA1", Surface Area <= 0.0; Entered Area=0.00

I can see many groups of coordinates in "BuildingSurface:Detailed" such as "Vertex 1 X-coordinate, Vertex 2 X-coordinate,Vertex 1 Y-coordinate", I want to know how to choose the correct coordinates. Thanks in advance

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answered 2023-05-07 14:32:55 -0500

Look up the overview and examples here. By default, EnergyPlus relies on a counterclockwise sequential vertex entry convention, when looking at a surface from outside its parent space/zone. A rectangular, adiabatic floor could thus be:

BuildingSurface:Detailed,
    Z1:Floor,    !- Base Surface Name
    Floor, Slab, !- Class and Construction Name
    ZONE1,       !- Zone
    Adiabatic,,  !- Outside Boundary Condition  and Target (if applicable)
    NoSun,       !- Solar Exposure
    NoWind,      !- Wind Exposure
    0,           !- VF to Ground
    4,           !- Rectangle
    9.0,  9.0,  0.0,
    9.0,  0.0,  0.0,
    0.0,  0.0,  0.0,
    0.0,  9.0,  0.0;

If such a rectangular space/zone is not fully enclosed with other surfaces (at a minimum, 4x walls + 1x ceiling), then its ceiling height & volume should be defined explicitly.

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Thank you Denis!

Louis W's avatar Louis W  ( 2023-05-11 13:55:46 -0500 )edit

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Asked: 2023-05-05 03:09:03 -0500

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Last updated: May 07 '23