ENERGY CONSERVATION, EFFICIENCY AND CO2e EMISSION
The provisions of this chapter regulate the design, construction, commissioning, and operation of buildings and their associated building sites for the effective use of energy.
This chapter is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve the effective use of energy.
601.4 Minimum requirements.
Buildings shall be provided with metering complying with Section 603, and commissioning complying with Section 611. Where required in accordance with Section 604.1, building shall be provided with automated-demand response complying with Section 604.
601.5 Multiple buildings on a site and mixed use buildings.
Where there is more than one building on a site and where a building has more than one use in the building, each building or each portion of a building associated with a particular use shall comply with Sections 601.5.1 or 601.5.2 or a combination of both.
601.5.1 Multiple buildings on a site.
For building sites with multiple buildings, the energy use associated with the building site shall be assigned on a proportional basis to each building based on total gross floor area of each building in relation to the total gross floor area of all buildings on the building site.
Where energy is derived from either renewable or waste energy, or both sources located on the building site, within individual buildings, or on individual buildings and delivered to multiple buildings, the energy so derived shall be assigned on a proportional basis to the buildings served based on building gross floor area. Energy delivered from renewable and waste energy sources located on or within a building shall be assigned to that building.
Exception: Where it can be shown that energy to be used at the building site is associated with a specific building, that energy use shall be assigned to that specific building.
601.5.2 Mixed use buildings.
Where buildings have more than one use, the energy use requirements shall be based on each individual occupancy.
MODELED PERFORMANCE PATHWAY
602.1 Performance-based compliance.
Compliance for buildings and their sites to be designed on a performance basis shall be determined by predictive modeling. Predictive modeling shall use source energy kBtu/sf-y unit measure based on compliance with Section 602.1.1 and CO2e emissions in Section 602.3. Where a building has mixed uses, all uses shall be included in the performance-based compliance.
Performance-based designs shall demonstrate a zEPI of not more than 51 as determined in accordance with Equation 6-1 for energy use reduction and shall demonstrate a CO2e emissions reduction in accordance with Section 602.2 and Equation 6-2 for CO2e.
|zEPI = 57 × (EUIp/EUI)||(Equation 6-1)|
|EUIp||=||the proposed energy use index in source kBtu/sf-y for the proposed design of the building and its site calculated in accordance with Section 602.1.2.|
|EUI||=||the base annual energy use index in source kBtu/sf-y for a baseline building and its site calculated in accordance with Section 602.1.2.|
602.1.2 Base annual energy use index.
The proposed energy use index (EUIp) of the building and building site shall be calculated in accordance with Equation 6-1 and Appendix G to ASHRAE 90.1, as modified by Sections 602.1.2.1 through 602.1.2.3. The annual energy use shall include all energy used for building functions and its anticipated occupancy.
602.1.2.1 Modifications to Appendix G of ASHRAE 90.1.
The performance rating in Section G1.2 of ASHRAE 90.1 shall be based on energy use converted to consistent units in accordance with Sections 602.1.2.2 and 602.1.2.3, instead of energy cost.