ABSTRACT
The renovation and modernization of this 41,500-square-foot building paired historic preservation requirements with net zero energy goals. The building, owned by the Government Services Administration (GSA), had a site energy use intensity (EUI) of 42.6 kBtu/ft2 in Fiscal Year 2008. The renovation was completed in 2013, and the EUI dropped by more than half to 21 kBtu/ft2/year. The PV system, which was downsized from the design team’s original proposal owing to historic preservation concerns, does not produce 100 percent of the energy required to operate at net zero (see Box 5.1). However, the GSA has committed to purchasing Renewable Energy Certificates (RECs) to meet any shortfall in on-site renewable energy production. Box 5.1: Project overview https://www.niso.org/standards/z39-96/ns/oasis-exchange/table">
IECC climate zone
5B
Latitude
39.07°N
Context
Urban, historic district
Size
41,562 gross ft2 (3,861 m2)
33,060 ft2 (3,071 m2) conditioned area
Height
3 stories
Building footprint
13,162 ft2 (1,222 m2)
Site area
25,160 ft2 (2,337 m2)
Program
Office, courthouse
Occupants
65
Annual hours occupied
2,080
Energy use intensity (2014)
EUI: 21 kBtu/ft2/year (66.3 kWh/m2/year)
Net EUI (before purchase of RECs): 6.5 kBtu/ft2/year (20.5 kWh/m2/year)
National median EUI for offices 1
Office: 67.3 kBtu/ft2/year (212.5 kWh/m2/year)
Courthouse: 93.2 kBtu/ft2/year (294 kWh/m2/year)
Demand-side savings vs. ASHRAE Standard 90.1–2007
68.7%
Certifications
LEED BD+C v3 Platinum; National Register of Historic Places
Energy Star Portfolio Manager benchmark for site energy use intensity
