For mixed-use mid-rise projects, should the energy model include commercial spaces? If so, how? The EPA and NYSERDA Simulation Guidelines suggest that only the residential spaces should be included in the energy model.
The energy model used for EA 1 in the Mid-rise Pilot should include the entire building. How the non-residential spaces are modeled depends on the type of non-residential spaces being addressed. There are three general categories of non-residential spaces that should be considered:
1) All of the energy components (e.g. systems, process loads, thermal envelope) of the non-residential space are defined and fall within the scope of the LEED for Homes project. In this case, the non-residential space must be included in the energy model.
2) None of the energy components of the non-residential space are defined or likely to be installed as of LEED for Homes certification. In this case, the non-residential space may be excluded from the energy model, but the project team must develop detailed green tenant fit-out guidelines (see relevant guidance from LEED for Homes on tenant fit-out guidelines).
3) Some of the energy components (for example, thermal envelope but not HVAC systems) of the non-residential space are defined or likely to be installed as of LEED for Homes certification. In this case, projects may choose whether to include the spaces in the energy model. If they are included, all energy components that are not installed and verified must be included in the proposed building model as equal in performance to the reference building (e.g., ASHRAE Std. 90.1). For any spaces that are excluded from the energy model, the project team must develop detailed green tenant fit-out guidelines (see relevant guidance from LEED for Homes on tenant fit-out guidelines).
Note: this interpretation only applies to projects pursuing certification under the Midrise v2008 pilot. It does not apply to projects pursuing certification under LEED for Midrise v2010.