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7.A. - Page 58 of 285 <br />Building Energy Efficiency <br />Standard Design <br />Efficiency EDR <br />52.6 <br />III I I I J <br />49.7 <br />Proposed Efficiency EDR <br />2019 Energy Efficiency Ordinance Cost-effectiveness Study <br />PV + Flexibility <br />Standard Design <br />PV + Flexibility EDR <br />22.5 <br />121.5 <br />Proposed PV i Flexibility EDR <br />49.7 21.5 <br />ED R kTDV/#t' I E D R kTDV/ft L* J <br />Building PV + Final <br />Efficiency Flexibility — EDR Score <br />28.2 <br />100,1 0 <br />100 represents 2006 IECC code home and 0 represents zero MV home <br />Figure 1: Graphical description of EDR scores (courtesy of Energy code Aces) <br />Results from this analysis are presented as EDR Margin, a reduction in the EDR score relative to the Standard <br />Design. EDR Margin is a better metric to use than absolute EDR in the context of a reach code because absolute <br />values vary, based on the home design and characteristics such as size and orientation. This approach aligns with <br />how compliance is determined for the 2019 Title 24 code, as well as utility incentive programs, such as the <br />California Advanced Homes Program (CAHP) & California Multifamily New Homes (CMFNH), which require <br />minimum performance criteria based on an EDR Margin for low-rise residential projects. The EDR Margin is <br />calculated according to Equation 1 for the two efficiency packages and Equation 2 for the Efficiency & PV and <br />Efficiency & PV/Battery packages (see Section 2.3). <br />Equation 1 <br />EDR Margin, ff«1en,y = Standard Design Efficiency EDR — Proposed Design Efficiency EDR <br />Equation 2 <br />EDR Marginefficiency &Pv = Standard Design Total EDR — Proposed Design Total EDR <br />2.2.3 Energy Efficiency Measures <br />Following are descriptions of each of the efficiency measures evaluated under this analysis. Because not all of <br />the measures described below were found to be cost-effective and cost-effectiveness varied by climate zone, <br />not all measures are included in all packages and some of the measures listed are not included in any final <br />package. For a list of measures included in each efficiency package by climate zone, see Appendix D — Single <br />Family Measure Summary and Appendix F — Multifamily Measure Summary. <br />Reduced Infiltration (ACH50): Reduce infiltration in single family homes from the default infiltration assumption <br />of five (5) air changes per hour at 50 Pascals (ACH50)6 by 40 to 60 percent to either 3 ACH50 or 2 ACH50. HERS <br />5 https://energycodeace.com/ <br />6 Whole house leakage tested at a pressure difference of 50 Pascals between indoors and outdoors. <br />5 <br />2019-08-01 <br />310 <br />