I am currently computing the elevators' energy consumption in the baseline according to Table G3.1, section 16. After assessing the total peak elevator motor power per car, as Design Builder (simulation software being used) doesn't simulate the elevators, I'm using the average run time and the estimated amount of runs per year to compute the yearly energy consumption in both scenarios. This schecule of use is based on the estimated usage from the project's Elevators Design and Usage Report, which would be included as evidence.
On the proposed model, there is no reference to how this consumption is computed, only mentioning that it has to be simulated with the same schedules, which it was. From the same elevator's report I meantioned earlier, the project team assessed the yearly energy consumption for each car in the building, according to all project and equipment details. So this energy consumption was the one accounted in the Proposed.
Is this a correct approach?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
March 2, 2021 - 1:48 pm
Yes the proposed energy use for elevators should be identical to the baseline since this is considered a process load.
Greenlab
Green Lab6 thumbs up
March 3, 2021 - 5:20 am
So, the energy consumption computed by the vertical transportation design team shouldn't be used (even if using the same shcedule as in the Baseline calculation) and both energy consumptions should be identical?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
March 3, 2021 - 10:55 am
Yes the energy use should be identical in both models since this is a process load and all process loads should be modeled identically. The proposed model is ALWAYS modeled as designed. The baseline simply uses the same calculation since there is no baseline defined in 90.1. The calculation methodology doesn't matter much as long as it is reasonable. If you are trying to claim savings for strategies associated with a process load that are not considered the norm in your area then you need to follow the exceptional calcualtion method where you define the baseline (as standard practice for your building type in your area) and justify the savings with calculations and data.