Ballard Emerald Star Zero Energy Home

Ballard Emerald Star Zero Energy Home

Vital Stats

Certification Status Zero Energy Certified
Version of LBC 3.1
Location Seattle, WA, USA
Typology Building
Project Area 2,218 SF
Start of Occupancy August 2015
Occupancy Type Single Family Residence
Number of Occupants 3

Project Team

Owner Dwell Development
Owner Representative Anthony Maschmedt
Architect Caron Architecture
Energy Engineer Evergreen Certified
Key Subcontractors Puget Sound Solar, Washington State University, Built Green
Photo Courtesy of Dwell Development Photo Courtesy of Dwell Development

Building Systems Information

Wall R value and section specification R-46. Double 2x4 stud wall, 12” cavity dense-packed R-46 cellulose, ½” OSB sheathing, fluid applied WRB
Roof R value and section specification R-84.
Floor R value and section specification R-24.
Windows Triple pane, low-e, argon filled, wood framed. U values = 0.16, SHGC = 0.49
Air infiltration rate and sealing protocol 1.13 (ACH-50). Fluid applied water/air barrier, interior air seal, minimal penetrations on exterior walls.

Non-Mechanical Systems

420-gallon rainwater cistern is installed.

Mechanical Ventilation

HRV, Merv 7 filters, Zehnder CA 350.

Hot Water

83-gallon CO2 water heater for radiant floor heat and hot water.

Lighting

Optimize southern and western exposure, double height spaces with maximum natural light.

Photo Courtesy of Dwell Development Photo Courtesy of Dwell Development

Renewable Production Systems Information

8.0 kW PV, 29 Itek Energy 275W panels, 14.5 APS 500W microinverters.

Performance

Actual energy use during performance period 7711 kWh
Actual energy produced during performance period 8872 kWh
Net Energy Use -1161 kWh
EUI 11.9 kBTU/sf/yr
Photo Courtesy of Dwell Development Photo Courtesy of Dwell Development

Design Process

The project team designed and built the Emerald Star home to continue to push the sustainability envelope. Find out more about the process here.