Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The intent of the Energy Multiplier is indeed to scale the energy use of the RAC(s) relative to 100% coverage. I created a simple new construction home in BEopt 2.8 that gives perfect results (for 100% vs 30% vs 20%):
That said, I can confirm in your retrofit case that it is not coming out that way and looks to be a bug. I think the issue is that the room air conditioner in the 100% case is being undersized, so its consumption is lower than it should be. If you look at the 20% and 30% runs in your graph, it does look like the 30% run consumption is 1.5x the 20% run consumption. Since BEopt 2.8 is more than 8 years old, it doesn't make sense to investigate further as there are no more bugfixes for that version. (But I will plan to see if BEopt v3 is similarly affected.)
| | 2 | No.2 Revision |
The intent of the Energy Multiplier is indeed to scale the energy use of the RAC(s) relative to 100% coverage. I created a simple new construction home in BEopt 2.8 that gives perfect results (for 100% vs 30% vs 20%):
That said, I can confirm in your retrofit case that it is not coming out that way and looks to be a bug. I think the issue is that the room air conditioner in the 100% case is being undersized, so its consumption is lower than it should be. If you look at the 20% and 30% runs in your graph, it does look like the 30% run consumption is 1.5x the 20% run consumption. Since BEopt 2.8 is more than 8 years old, it doesn't make sense to investigate further as there are no more bugfixes for that version. (But version, but I will plan to see if BEopt v3 is similarly affected.)affected.
