General Energy Use, Strategies and Systems

Energy Use:

Design to the Passive House standard carefully examines all energy uses, and must aggressively manage them to achieve Passive House certification for a small building in a cold climate like this one. So aggressive passive design techniques are used to minimize annual energy use, at a higher first cost in design and materials and this minimizes the need for additional energy sources, maximizes the return delivered by the PV and solar DHW systems, and the ground loop ventilation pre-conditioning system. The slab on grade is significant in moderating temperature fluctuations, by absorbing and re-radiating solar energy. Shading via South elevation brise soleil and deep West porch overhangs help manage unwanted gains in conjunction with operable internal shading.

Energy Strategies:

100% Electric home.
Aggressively minimize energy use using passive techniques described above, using super-insulation, thermal bridge free design, ~ R9 / SHGC 0.50 center of glass windows, extremely low air infiltration, high performance ERV with ground loop pre-heating / dehumidification, PV, Solar DHW to meet Passive House space heating, cooling and primary energy requirements.

Zero Net Energy Definition Used Site Energy Use

Monthly Energy Data and Utilities

Energy Data Type:
Modeled
Electric Utility:
EverSource
Gas Utility:
NA
Other purchased Fuels:

No

Datasets and utility bills sources and reliability:

Source is utility bills and PV meter readings (for SREC program).

Renewables and Energy Balance

Renewable Energy Sources:
Renewable energy is generated within the building footprint (e.g. solar PV on the roof), Clean energy is imported from off-site (e.g. utility wind power), or renewable energy certificates (RECs) are purchased
Renewable Energy System Description & Details
A conventional roof mounted 4.56KW PV system (anticipated production of 6206 KWhrs/yr) has been installed. Three flat plate roof top solar DHW collectors and two 80 gallon storage tanks with electric resistance backup are installed, totaling approximately 93 sf. Ventilation system with ground loop pre-conditioning.
Annual renewable energy generated 6,200 kWh
Annual Renewable Energy Generated Data Type Estimated
Power Rating Renewable Energy System Type(s) Source of Annual Production Data
4,560Watts Photovoltaics, Other Not yet available.

Storage and Installed Capacity

See above.

Energy systems description:

The superinsulated slab on grade absorbs solar energy entering via the South glazing, managed by the brise soleil.
Two 80 gal. solar DHW tanks store solar energy from the 93 sf flat plate solar collectors array.

Energy Storage Capacity

Annual Energy Import/Export