What are typical charging rates for creating a building energy model? Do you charge by geometry features (vertex, floors, etc.), equipment features (HVAC, lighting, etc.), or total time spent creating the model?
I typically see charges based on total estimated time, so it is based on an individual's hourly rate. This includes time spent creating the model, analyzing energy conservation measures, HVAC options, and analyzing results. This depends on the scope of the modeling though, if LEED Online documentation is required, that is typically a separate (additional) fee. We will often add a limitation on number of model architectural updates, number of HVAC systems that will be tested, etc. Anything beyond would be an add service.
Complex geometry can certainly be a big influence on the cost of creating a model. Similarly, if the zoning will be very precise this can result in a higher level of effort.
Another factor to consider if whether the modeling program allows for multipliers to be used for floors and systems that are similar to each other.
Look for ways that the model can remain accurate, but be simplified in terms of input to reduce the level of effort.
Much of your time might be spent after the model is producing results. Either the design may change, or many alternatives will be considered. As the earlier response noted it may be prudent to discuss the anticipated architectural updates and include a limitation on how many of these will be modeled.
If the model will be calibrated, allow time to compile the data that will be used for tuning the modeled controls.
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