Carbon Action Project Launch Booklet | Page 20

• Orientation of the house The long sides of the house face north and south. • Double glazed windows All windows are double-glazed, with more windows on the north fac- ing side of the house, and minimal windows on the east and west sides. The windows are located so that when they are opened, air from the outside can flow through the house. • Honeycomb blinds These blinds provide additional insulation when drawn. • Eaves The eaves on the north side of the house are designed so that the inside of the house is shaded from the summer sun (when the ob- jective is to keep the house cool), but not from the winter sun (when the objective is to warm the house). • Solar Photovoltaic System The solar panels generate most of the electricity used in the house, with any excess fed into the grid. • Battery The battery is charged from the solar panels, and provides much of the electricity to the house when the solar panels are not generat- ing, such as in the evening. On some occasions when there is a power shortage on the grid, the battery can be used to feed-in to the grid. • Battery backup When there is a blackout (i.e. no electricity from the grid), some of the circuits in the house are configured to continue to operate using electricity from the battery. • LED lighting LED lights are more energy efficient than older forms of electric lighting. • Hydronic heating and cooling The house is heated when required by circulating warm water through tubes embedded in the slab floor. It is cooled by circulating cool water through the same tubes. A reverse cycle heat pump is used to heat or cool the water. The hydronic heating and cooling system can be operated during the day when the solar panels are generating, and turned off at other times. The slab acts as a heat bank, and so continues to heat or cool the house for a period after the hydronic heating and cooling system is turned off. Carbon Action Project 17 1 March 2020