The layout team selected a solar water heating system – in place of a blended space/water heating device – for simplicity, sponsored up with the aid of a herbal gasoline tankless water heater. The group calculated that the 96 square foot collector region and 200-gallon water storage could result in an annual solar-savings fraction of 88%. They opted for the tankless herbal gasoline again up heater after locating that the tankless machine uses 0 heating electricity whenever the solar water tank is at or above one hundred fifteen diplomae best water filter pitcher transport temperature.
The Crowning Element
Having reduced all possible strength masses as a lot as possible, the design crew zeroed in at the lights, appliances and miscellaneous electric hundreds (MELs). They mounted compact fluorescent mild bulbs throughout the house and ENERGY STAR label appliances. This left the miscellaneous electric powered loads, from TV, hairdryer, toasters, computer systems, and anything else that might be plugged in through the occupants. Using Built America benchmark assumptions on MELs, the team settled on a 4kW PV machine. Because the Built America assumptions on based upon a national average of a ‘traditional’
American family, the actual occupant use and neighborhood climate can also both block the home from accomplishing zero energy utilization, or propel it to the ranks of ‘internet electricity producer’.
Initial check effects were encouraging. From February to July of 2006, the PV machine produced 1, six hundred kWh greater electricity than the residence consumed. Factoring inside the natural gas used for space heating and water heating back up, the house produced 75% greater supply energy than it ate up. Although an extended trying out period is needed, it’s a safe bet to mention that the house could be an annual net power producer in place of simply attain an internet zero strength person. However, this may change if the occupants begin the use of more than the average calculated into the Built America benchmark.
And the home proprietors? While it’s miles authentic that the house is a net strength manufacturer, they alas aren’t unfastened from utility bills. There is the monthly rate for the herbal gas, in addition to fixed charges for the electrical grid and herbal gas connection expenses. From October of 2005 to May of 2006, the proprietors shelled out a median of $18.25 consistent with the month in energy payments. Because the fixed month-to-month expenses averaged 80% of these bills, in truth the circle of relatives used on common $14.60 really worth of power.
For those folks who suffered thru $two hundred+ monthly power bills during that same length, the results of the one are very compelling.
KEY RESIDENTIAL SUSTAINABLE FEATURES
- Energy and Atmosphere
- Passive Solar Design
- The residence was designed with expanded glazing place at the lengthy South facing aspect, and decreased glazing vicinity on the North, East and West going through facets.
- Renewable Energy
- 4kW Photovoltaic machine using software electricity grid storage to cast off want for and associated excessive value of, garage battery
- Raised heel trusses in an attic allow 2 feet of blown fiberglass insulation, attaining R-60 score for thermal envelope pinnacle
- Floors insulated to R-30
- R-three fiberglass batts in outer 2 x 4 structural stud wall cavities, and a 2nd, interior 2×4 stud wall with R-thirteen fiberglass batts positioned horizontally between stud partitions and vertically in indoors wall cavities
- Outer vapor-permeable house wrap and fiber cement siding
- Inner poly vapor barrier and drywall
- Space Heating
Hybrid natural gasoline/electric powered heating system, combining a point source direct-vent natural gasoline furnace inside the living room and eating vicinity, and small baseboard electric powered-resistance warmers inside the bedrooms. This combination affords the brought bonus of zone heating, as each equipment has its very own independent thermostat.
Solar water heating system with 96 rectangular toes collector vicinity and 2 hundred-gallon water storage tank as primary water heating system, with natural gas tankless water heater as a backup device
Double – glazed, low -e glass set up in South dealing with home windows, with U-factor of zero.3 and SHGC of zero.58. For the East, West and North facing windows, Double – glazed, low – e glass became also used, with a U-issue of 0.22 and SHGC cost of 0.27. The U-elements of all windows exceeds (ENERGY STAR necessities by way of 20%).
ENERGY STAR® appliances had been installed.
Compact fluorescent light bulbs deployed all through the residence
Indoor Environmental Quality
Energy Recovery Ventilation (ERV) machine with efficient electronically commutated automobiles, exhausts air from the kitchen and lavatory and materials sparkling air to the dwelling room and bedrooms.
Outdoor Air Ventilation
The ERV device heats incoming sparkling air with the warm temperature of the exhaust air, thus drastically decreasing heat loss from the air flow.
Materials and Resources
Advanced Framing Techniques: Walls encompass inner 2×4 stud wall, 24 inches O.C.