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

louvers with long distance to the building should be inside the zone or outside the zone?

asked 2016-07-03 06:58:00 -0500

updated 2017-05-04 08:49:38 -0500

I have a louver with three blades(2.0m x 0.5m) adjacent to my building by 2.0m distance as a shading surfaces.image a.

I would like to know that they have to be inside the zone (in blue color) like image b OR outside the zone(in violet color) like image c.

if I design outside the zone,it will have significant different result compare to inside the zone or not?

Thanks in advance for any help.

image a image description

image b image description

image c image description

edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted

answered 2016-07-04 12:43:26 -0500

updated 2016-07-05 03:09:00 -0500

Doesn't really matter unless you'll rotate the building.

See Shading:Zone:Detailed:

This object is used to describe attached “subsurfaces” such as overhangs, wings or fins that project outward from a base surface. This classification is used for convenience; actually, a device of this type can cast shadows on the surface to which it is attached as well as on adjacent surfaces. For example, a fin may shade its parent wall as well as adjacent walls

See the documentation for Detached Shading Surfaces, especially Shading:Site:Detailed and Shading:Building:Detailed.

If relative coordinates are used (ref: Field: Coordinate System in GlobalGeometryRules), shading surfaces entered with Shading:Site:Detailed remain stationary if the building is rotated, whereas those entered with Shading:Building:Detailed rotate with the building. If world coordinates are used Shading:Site:Detailed and Shading:Building:Detailed are equivalent.

I generally choose to use a detached shading group (image c, purple)

Note that whether or not you put the shading surface to "touch" a building surface such as a wall, it won't participate in heat transfer anyways.

edit flag offensive delete link more


@Julien Marrec, Thank you Julien for your reply.

4Designer's avatar 4Designer  ( 2016-07-05 03:06:51 -0500 )edit

Your Answer

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

Add Answer

Training Workshops

Question Tools

1 follower


Asked: 2016-07-03 06:58:00 -0500

Seen: 340 times

Last updated: Jul 05 '16