Problem in interior solar distribution calculation [closed]

asked 2019-02-19 01:07:15 -0500

zahro's avatar

Hello, I am modeling a building with a glass curtain wall, as displayed below: image description

The building has an enormous amount of window and uses green low-e glass system. Usually, I developed a model with solar distribution type: Full Interior and Exterior However, for this building, I get an error message like this:

Severe  ** Problem in interior solar distribution calculation (CHKBKS)
   **   ~~~   **    Solar Distribution = FullInteriorExterior will not work in Zone=FLOOR 4 - 8
   **   ~~~   **    because vertex 1 of back surface=SURFACE 21 is in front of receiving surface=SURFACE 24
   **   ~~~   **    (Dot Product indicator=20230.0000)
   **   ~~~   **    Check surface geometry; if OK, use Solar Distribution = FullExterior instead.

The error comes for surface 23 and 24. Those surfaces are the surface with biggest WWR, facing each other in 90deg. When I delete the subsurface on surface 23 and 24, and use Full Interior Exterior solar distribution, the error disappears.

Also when I use the Full Exterior solar distribution with my current geometry, it works without error.

I am looking at the explanation of the differences between Full Exterior and Full Interior Exterior distribution here in InputOutput Reference.

However, I am not sure whether it would bring significant changes or not in term of the result.

With my current building condition, is it enough to only use Full Exterior distribution, or do I need to repair the model somewhere so it could work with Full Interior and Exterior distribution?

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Closed for the following reason duplicate question by Aaron Boranian
close date 2019-02-19 16:26:24.633118



Question has already been asked here. The top floor is L-shaped, or non-convex, which is something that the "FullInteriorExterior" option cannot handle. You will need to split this into two separate zones that are convex in order to use "FullInteriorExterior" and have EnergyPlus calculate solar gains on all internal surfaces correctly instead of assume all solar gains only hit the floor (what happens with the "FullExterior" option).

Aaron Boranian's avatar Aaron Boranian  ( 2019-02-19 16:28:28 -0500 )edit