Elithis tower : an energy positive office building

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Elithis tower was dedicated the 2nd of april 2009. Located in Dijon, France the tower has becomed the first energy positive office building.

Building size -54,000 square feet

Building details - Ten stories of office space

Main floor of retail and restaurant space

Building height - 110 feet

Total building cost - 7 million euros (6.3 million GBP)

Materials for this project were chosen according to their global environmental impact. The exterior of the building is made of wood and recycled insulation, while aluminum, which strongly impacts the environmental, was used sparingly. Bay windows were selected to bring in natural light.

To complement this, a special nomad was designed by the Elithis team to guarantee a comfortable level of light is available without excess artificial illumination.

To take advantage of solar energy (warmth and natural light) without the associated inconveniences (excess heat and blinding brightness) a solar shield was designed by the Elithis engineers. Thanks to the unique design of this shield, natural light enters the building while excess heat and blinding light are filtered out.

In addition, a triple flow system has been patented by Elithis, which harmonises energy in the building. Office energy emissions (from computers, photocopiers, lights, people...) are recovered, saved, harnessed and reused within the Elithis Tower.

the external roof is carried out with 560 m2 of integrated hybrid photovoltaic panels (power : 82 kW-peak , production : 82,000 kWh/an)

Until the mid--season a system of free-cooling with mechanical regulation makes it possible to refresh the building in a natural way.

The production of heat and cold rests on a very efficient thermodynamic adiabatic system associated with 2 automatic wood pellet of 100 kW each one.

The renewal of the air is ensured by a double flow air treatment system with energy recovery.

The consumption of primary energy for the building is lower than 21 kW/m2/an

Lessons learnt

Elithis Engineering doesn't want its energy efficiency feat to go unnoticed by workers in the building, so the company designed a public sign that shows off daily energy consumption, courtesy of 1,600 energy and emissions-analysing sensors. Perhaps best of all, the building was relatively cheap to construct, with a price comparable to that of a traditionnaly-built structure

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