happy to see the LBT 1.3.0 has been released! I’m interested in the topic about how to simulate air flow network and convection heating transfer of big spaces in honeybee & energyplus. However, there are some problems when I design a model, which contains skylight in energy simulation with AFN. Please refer to the picture below.
I guess, that the roof or skylight aperture can’t be recognized correctly in AFN model, but I don’t know how to solve it. Is there any suggestions from your guys?
Ah, I was wondering when an issue like this might be discovered. I knew that the objects we were using for windows with the AFN weren’t made to model perfectly horizontal openings but I though that everything would be alright when the skylights weren’t operable like your model. I guess EnergyPlus is just particularly fussy when it comes to the AFN.
I think I probably get a fix for this case merged into the development version of the plugin today or tomorrow. I should clarify that the EnergyPlus AFN doesn’t currently support operable skylights that are perfectly horizontal since the math around this type of bi-directional flow gets really complex. But I should be able to get your model to simulate without issues since the horizontal skylights are not operable.
Thanks for your quick reply, Chris! Now I understand the temporarily inherent defects of AFN algorithm in Energyplus. However, although I turn off the “operable” option for skylight, the problem still exist.
Could you take few seconds and check it again? Thanks a lot in advance!
Did you miss this part of my response, @YZZhang ? I guess I should have said explicitly “this is a bug that I am going to fix.”
Ops, I might misunderstand your reply. Thanks for your patience!
I just merged a fix into the development version of the plugin:
So your model with the AFN now succeeds.
I also added a check into the AFN component that will give you a warning whenever you have operable horizontal apertures on the exterior.
Leaving the skylights as in-operable ensures that everything is correct.
You can get the fixes on your end now with the “LB Versioner”.