A proposal for an eco-housing development on the coast of Aalborg, Denmark takes a radical approach to sustainable design with its dramatic south-facing sloped roof, which is completely covered in solar panels. The entire housing development aims to run completely off renewable energy while achieving high energy efficiency through the use of passive-house standards. Besides the solar roof, four small wind turbines located on site take advantage of the ocean breezes to produce even more energy, which could be used to charge electric vehicles.
Housing+ was designed by C.F.Møller in collaboration with Moe & Brødsgaard, Cenergia, Phillips, Schüco, Erik Juul and Vogt landscape. The zero energy development includes 60 residential units in a large sloped volume that stands 12 stories in the back and slides down to four in the front. The roof is covered in a 1,200 sq m photovoltaic system, which is enough to produce 1740 kWh of electricity for each unit, and a total of 104,400 kWh annually. The roof also contains a solar hot water heating system to provide hot water to the units that is stored in a large insulated tank. Four vertical axis, low-noise wind turbines are installed on the site to provide additional energy generation.
Additional sustainable design strategies include the collection of rainwater for landscape irrigation, landscaped atria in the building that provide cooling and serve as light wells for daylighting, a geothermal heat pump that uses the nearby water as a sink, and natural ventilation. The development is designed to passive-house standards to maximize energy efficiency and create a super-tight envelope. As an extra amenity to the occupants the roof plane slopes down to the waterfront and creates an covered public gazebo and café.