Concord Riverwalk Net Zero

Concord Riverwalk is a progressive cluster development of 10 net-zero energy capable new homes and 2 major renovations in a walkable neighborhood setting. The developer, NOW Communities, asked ZED to design the HVAC systems for the homes.

Walls/Roof/Foundation
- 2x6 w/ 4" of Foil-Faced Polyiso
- Closed Cell Spray Foam
Windows/Doors
- Triple paned low-e windows
Heating/Cooling
- Air source heat pumps
Ventilation
- Heat Recovery Ventilator
Solar Electric
- All units net zero capable
- Some units net zero energy
Solar Hot Water
- Most units include SHW

Goals. The mechanical design needed to match the high performance building envelope modeled and designed by Marc Rosenbaum. Ultra-low energy consumption as a baseline was the target with net zero energy performance for some of the homes.
Mechanical Systems. The 'right-sized' ducted and ductless air source heat pumps and HRVs provide exceptional comfort and excellent indoor air quality with reduced energy consumption..
Renewables. Solar thermal panels produce ~75% of the required heat for hot water, with the balance provided by an electric hot water tank. The all-electric HVAC and hot water solution is easily upgradable to net zero energy, offers reduced system installation costs for the developer, and lower ongoing operating costs for the new homeowners.