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7.A. - Page 55 of 285 2019 Energy Efficiency Ordinance Cost-effectiveness Study Table 1: Prototype Characteristics Characteristic Single Family Single Family Multifamily One -Story Two -Story 6,960 ftz: Conditioned Floor Area 2,100 ftz 2,700 ft2 (4) 780 ftz & (4) 960 ftz units Num. of Stories 1 2 2 Num. of Bedrooms 3 3 (4) 1 -bed & (4) 2 -bed units Window -to -Floor Area Ratio 1 20% 20% 15% Source: 2019 Alternative Calculation Method Approval Manual (California Energy Commission, 2018a). The Energy Commission's protocol for single family prototypes is to weight the simulated energy impacts by a factor that represents the distribution of single -story and two-story homes being built statewide, assuming 45 percent single -story and 55 percent two-story. Simulation results in this study are characterized according to this ratio, which is approximately equivalent to a 2,430 -square foot (ftz) house.' The methodology used in the analyses for each of the prototypical building types begins with a design that precisely meets the minimum 2019 prescriptive requirements (zero compliance margin). Table 150.1-A in the 2019 Standards (Energy Commission, 2018b) lists the prescriptive measures that determine the baseline design in each climate zone. Other features are consistent with the Standard Design in the ACM Reference Manual (Energy Commission, 2019), and are designed to meet, but not exceed, the minimum requirements. Each prototype building has the following features: • Slab -on -grade foundation. • Vented attic. • High performance attic in climate zones where prescriptively required (CZ 4, 8-16) with insulation installed at the ceiling and below the roof deck per Option B. (Refer to Table 150.1-A in the 2019 Standards.) • Ductwork located in the attic for single family and within conditioned space for multifamily. Both mixed fuel and all -electric prototypes are evaluated in this study. While in past code cycles an all -electric home was compared to a home with gas for certain end -uses, the 2019 code includes separate prescriptive and performance paths for mixed -fuel and all -electric homes. The fuel specific characteristics of the mixed fuel and all -electric prototypes are defined according to the 2019 ACM Reference Manual and described in Table 2.2 12,430 ftz = (45% x 2,100 ftz) + (55% x 2,700 ftz) 2 Standards Section 150.1(c)8.A.iv.a specifies that compact hot water distribution design and a drain water heat recovery system or extra PV capacity are required when a heat pump water heater is installed prescriptively. The efficiency of the distribution and the drain water heat recovery systems as well as the location of the water heater applied in this analysis are based on the Standard Design assumptions in CBECC-Res which result in a zero -compliance margin for the 2019 basecase model. 2 2019-08-01 307