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Velux Sunlighthouse is Austria's First Net-Zero Energy and Carbon House
The home’s long skinny lot, with partial shading and awkward orientation prevented the architects from achieving the aggressive Passivhaus standards. Instead they maximized the solar potential as well as the efficiency. The large sloping roof maximizes solar exposure hosting three technologies, which make full use of the sun. The first is a grid of skylights that provide passive solar and maximize daylighting throughout the space. Rows of solar thermal panels set between the skylights heat domestic water and assist in space heating. Finally a 48 square meter solar array provides 1/3 more electricity than the home consumes.
The mechanical system is focused on a brine water ground-source heat pump for the underfloor heat and hot water needs. Passive cooling is achieved during the warmer months with an elegant design that uses an open stairway and the stack effect. Windows automatically open and the energy recovery ventilator shuts off in accordance to the room temperature, making the system work with little intervention by the occupants.
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