Hi,
According to the LEED interpretation (ID# 100002149). One is exempt from the ASE criteria (<10%) if incorporating interior automated window blinds or shades.
LM-83 seems to "recommend" a system where all blinds (regardless of orientation) are to be lowered whenever 2% of the analysis grid nodes are exposed to direct sunlight >1000lux. This means that blinds on a north facing side of a buidling are lowered even if all of the 2% nodes are located on the southern side. Is there a reason why LM-83 makes no attempt to account for multiple orientations in a room? I'm thinking that the realistic scneario is that there would be separate trigger-nodes for each side of the building.
Thefore my question is:
- Are there any alterative allowed methods for how/when automatic blinds are to be triggered? For example, in DIVA for rhino, the default settings for automatic blinds are set up so that the sensor are connected to the window rather than the grid sensors and that the blind is responding to sun ray vector angle rather than the illuminance level.
Thanks
Par
TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
889 thumbs up
March 16, 2018 - 12:54 pm
LM 83 was written awhile ago and based on what was capable of being done by programs at that the time with hopes for improvement in the future. But now, we got lots of programs that are doing alot of things. I don't believe they were assuming that all down at once. That makes no sense on what they were trying to accomplish. I think that sensor placement on the window for each orientation would be acceptable. It is accomplishing the same thing. Yes, we could argue on whether sensor reading is better than vector analysis, but that is not for this. I think you would be fine in doing this and it would not be questioned by a reviewer. I would say even if you noted sensor placement, it would not be questioned by your typical reviewer.