Hikari, the first urban islet of positive energy in Lyon

Arranged along a nautical square, three new buildings are aligned in the center of the neighborhood, a piece of the city futuristic in prolonging the center of Lyon, built on old industrial remains.

The Hikari project began more than 10 years ago, and currently has 150 hectares, but due to double the surface. This ecobarrio of France must come to term at the end of 2020 and stop producing carbon despite the construction of one million square meters.

Opened last September 17, the new set, called Hikari (light in Japanese), designed by Japanese architect Kengo Kuma, explodes the limits on energy consumption. This is the first islet mixed of energy positive in Europe. The set of the twelve 1800 square meters produce more energy than it consumes.

To achieve these figures, the designers used the best techniques of architecture bioclimatic, but mostly are mixed offices, shops, apartments, in order to better control the different uses and cycles of energy use. The main innovation of Hikari is based on the pooling of the energy produced.

The three buildings are connected to each other to better distribute their needs. The surplus energy produced is stored and restored in times of strong demand thanks to a stack of fuel.

Offices and apartments are not in effect the same cycles of energy.

The offices are deserted at night, when the occupation of the apartments is at its maximum. If a Sunday morning with the sun, the offices are empty and produce energy, it can be injected into the apartments. In the basement, a central brain piloting the set.

Energy production is guaranteed by panels photovoltaic installed on the roof of the forty-two apartments. A generator fuel with rapeseed oil supplement guarantees. Cold needs of the offices and shops are covered by an absorption chiller that produces chilled water from the heat and cold generation of the layer groundwater.

A device geothermal cooling also taking part in the low temperatures of the waters of the rivers. The result is simple, Hikari consumes 50 percent less than the current thermal regulation standards and produces an amount of energy greater than their consumption, about 0.2%.

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