703 Heliotrope Avenue is a 4,211 gsf a single family residences that have achieved zero-net-energy (ZNE) performance. The project was developed in a lot with existing single family dwelling and significant portion of the materials from the demolished construction were recycled or repurposed. For insulation value, the windows at 703 Heliotrope are triple-glazed, providing an R-value equal to 5. The solar exposure of the southeast-facing street facade suggested passive solar design using large window areas. To admit solar heat during the winter, the middle glazing layer has a special coating that admits sunlight readily but excludes the ultraviolet light to minimize its damaging effects. (Solar heat gain coefficent = 0.47). In the summer, blinds internal to the window units can be operated to provide shading. Other sustainability facts:
Electric air source heat pumps, thus providing both heating and cooling capability.
Exceeded even the Passive House standard for airtightness;
Fresh air ventilation system added and natural ventilation;
LED lighting;
Sinks are equipped with an automatic recirculating pump that saves water when the hot water tap is about to be opened;
On-site solar PV system at 703 Heliotrope consists of 78 panels.
Please read the
ZNE Homes Vol. 1 Case Studies for more information on the project.