AgdaPkt 2020-01-13 Joint - Laserfiche WebLink

Browse Search

7.A. - Page 188 of 285 2019 Nonresidential New Construction Reach Code Cost Effectiveness Study 3.2 Solar Photovoltaics and Battery Measures This section describes the PV and battery measures considered for this analysis. The Reach Code Team estimated the required PV sizes for each building prototype for the efficiency measure packages and the stand alone PV and battery options. 3.2.1 Solar Photovoltaics 2019 Title 24 requires nonresidential buildings to reserve at least 15 percent of the roof area as a "solar zone," but does not include any requirements or compliance credits for the installation of photovoltaic systems. The Reach Code Team analyzed a range of PV system sizes to determine cost effectiveness. To determine upper end of potential PV system size, the Reach Code Team assumed a PV generation capacity of either ♦ 15 W/ft2 covering 50 percent of the roof area, or ♦ Enough to nearly offset the annual energy consumption. The medium office and small hotel prototypes had small roof areas compared to their annual electricity demand, thus the PV system capacity at 50 percent of the roof area was less than the estimated annual usage. The medium office and small hotel had a 135 kW and 80 kW array, respectively. The medium retail building has a substantially large roof area that would accommodate a PV array that generates more than the annual electricity load of the building. The PV array for the medium retail building was sized at 110 kW to not exceed the annual electricity consumption of the building when accounting for the minimum annual energy demand across climate zones with efficiency packages. The modeling software for nonresidential buildings does not allow auto -sizing of PV based on a desired percent offset of electricity use. Moreover, the PV size is also constrained by the availability of roof area. Hence, a common size of PV is modeled for all the packages including all electric design. Figure 5 through Figure 7 below demonstrate the percent of electricity offset by PV for both mixed fuel and all electric buildings over their respective federal minimum design package. Figure S. Medium Office - Annual Percent kWh Offset with 135 kW Array 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 13 Medium Office - Percent kWh Offset by PV 111111111111111111111 IHI 111111 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Climate Zone ■ Mixed -Fuel ■ AII-Electric 2019-07-25 440