How to model Solar Tubes without a ceiling cavity?

asked 2020-01-02 12:29:26 -0500

mldichter gravatar image

updated 2020-01-10 10:25:30 -0500

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?

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?

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