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

Revision history [back]

click to hide/show revision 1
initial version

How to model Solar Tubes without a ceiling cavity?

As far as I know, the DaylightingDevice:Tubular object must reference two FenestrationSurface:Detailed objects, each of which must be embedded in a BuildingSurface:Detailed object. Is there a way to model a solar tube with a dome that is attached to the roof surface, but the diffuser surface is free floating in the space?

How to model Solar Tubes without a ceiling cavity?

As far as I know, the DaylightingDevice:Tubular object must reference two FenestrationSurface:Detailed objects, each of which must be embedded in a BuildingSurface:Detailed object. Is there a way to model a solar tube with a dome that is attached to the roof surface, but the diffuser surface is free floating in the space?

image description

How to model Solar Tubes without a ceiling cavity?

As far as I know, the DaylightingDevice:Tubular object must reference two FenestrationSurface:Detailed objects, each of which must be embedded in a BuildingSurface:Detailed object. Is there a way to model a solar tube with a dome that is attached to the roof surface, but the diffuser surface is free floating in the space?

POST SCRIPT
Here's an obvious idea. Can I just have a rectangular prism attached to the ceiling that extends down into the space? I could put the two fenestration surfaces on the top and bottom of the box. However, I then have to split up the roof into a lot of rectangles to keep all the surfaces convex. Is there a better way? Does a fake bottom surface made of air simulate correctly in EnergyPlus?

image description

How to model Solar Tubes without a ceiling cavity?

As far as I know, the DaylightingDevice:Tubular object must reference two FenestrationSurface:Detailed objects, each of which must be embedded in a BuildingSurface:Detailed object. Is there a way to model a solar tube with a dome that is attached to the roof surface, but the diffuser surface is free floating in the space?

POST SCRIPT
Here's an obvious idea. Can I just have a rectangular prism attached to the ceiling that extends down into the space? I could put the two fenestration surfaces on the top and bottom of the box. However, I then have to split up the roof into a lot of rectangles to keep all the surfaces convex. Is there a better way? Does a fake bottom surface made of air simulate correctly in EnergyPlus?

image description