Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Perhaps these paragraphs from the Users' Manual clarifies:
There is a special case for calculating the energy cost for proposed buildings that have on-site renewable energy sources or site-recovered energy. For example, a building may have a solar thermal array, photovoltaic panels, or access to a geothermal energy source. Or a building with substantial refrigeration loads may recover heat from the condenser to meet service water heating loads. If the proposed building has either renewable or recovered energy, this energy is considered free energy by the building performance rating method, and that energy is not included in the proposed building performance rating.
The baseline building does not have on-site renewable energy source or heat recovery, except as required by G3.1.2.10 or Table G3.1-11b. For the baseline building, the loads which are met by renewable or recovered energy in the proposed building are considered to be served by the backup energy source
"Backup energy source" just seems to be the non-renewable (e.g. grid-supplied) energy.
| | 2 | No.2 Revision |
Perhaps these paragraphs from pages G-7 and G-8 of the (2007) Users' Manual clarifies:
There is a special case for calculating the energy cost for proposed buildings that have on-site renewable energy sources or site-recovered energy. For example, a building may have a solar thermal array, photovoltaic panels, or access to a geothermal energy source. Or a building with substantial refrigeration loads may recover heat from the condenser to meet service water heating loads. If the proposed building has either renewable or recovered energy, this energy is considered free energy by the building performance rating method, and that energy is not included in the proposed building performance rating.
The baseline building does not have on-site renewable energy source or heat recovery, except as required by G3.1.2.10 or Table G3.1-11b. For the baseline building, the loads which are met by renewable or recovered energy in the proposed building are considered to be served by the backup energy
sourcesource.
"Backup energy source" just seems to be the non-renewable (e.g. grid-supplied) energy.
