Higashi: brand image and working comfort

Higashi is one of the 3 buildings that make up the Hikari block in the Confluence district of Lyon. Its excellent visibility at the corner of the Charlemagne course, its clear views and its quality service (Tramway, on foot, TGV station, metro) make it an exceptional tertiary site, including the headquarters of Deloitte.

-> Find the case studies of the 2 other buildings (Minami & Nishi) in our database "Buildings".

-> Find the case study of the entire Hikari project in our "Neighborhoods" database.

Sustainable development approach of the project owner

The project is fully in line with Lyon Confluence's sustainable development policy, in line with the 5 axes of Agenda 21 in Lyon and meets the very high energy performance level set by the specifications: it must be BEPOS all-purpose considered. Designing a positive energy building in a densely populated urban area, on the block scale and not in the neighborhood, is a challenge that is essentially addressed by: • an architecture favoring the implementation of passive devices • maximum use of renewable energies present in situ • the judicious integration of façade surfaces with photovoltaic panels • storage and energy transfer favored by the diversity of the program. However, limiting the reasoning to a "positive energy" criterion can be reductive if the design does not fit into a more global logic, taking into account criteria such as carbon balance, gray energy or notions of use And maintenance and operation.

Architectural description

A BIOCLIMATIC APPROACH The development of HIKARI Lyon Confluence is the result of the collaboration between a multidisciplinary and Franco-Japanese design team led by architect KENGO KUMA and a leading and innovative promoter Bouygues Immobilier / SLC bringing its vision of the market. The envelope of the buildings of HIKARI Lyon Confluence was the subject of a bioclimatic approach through which architects, thermicists, energy engineers, lighting engineers and environmentalists tried to passively treat most of the comfort and Reduction in energy requirements. The "user comfort" of HIKARI Lyon Confluence, a skilful balance between the many parameters that contribute to the quality of the spaces (orientation, light, atmosphere, use ...), has been the permanent focus of the " Project team in order to make the mix of the program attractive and its positioning relevant to the market. ATTACHMENT TO THE CHOICE OF MATERIALS IN A "C TO C" LOGIC The development of a project with a demonstration objective implies a definition of the choice of materials, systems and equipment going down to the smallest details. On HIKARI Lyon Confluence, it was in a "Cradle to Cradle" logic that these choices were made, in order to minimize the carbon footprint of the operation and allow recycling as long as possible of the materials used.

If you had to do it again?

The demonstration and monitoring phase, which will follow the delivery of the building, will cover and analyze all available parameters in order to adjust the technical factors of the island and its equipment to make it actor, as a living being, its behavior And its energy strategies, in the service of control and the economy of consumption.

See more details about this project

https://www.construction21.org/france/case-studies/fr/minami-32-logements-contemporains-faconnes-pour-la-vie-des-familles.html
https://www.construction21.org/france/case-studies/fr/nishi-des-villas-suspendues-sur-un-immeuble-de-bureaux.html
https://www.construction21.org/france/city/fr/hikari-premier-ilot-urbain-a-energie-positive.html

Stakeholders

Function : Contractor

Bouygues Immobilier/SLC Pitance

[email protected] - 04 72 68 28 33

http://www.bouygues-immobilier.com

Bouygues Immobilier is committed to continuously improving the technical and architectural quality of its buildings and satisfying its customers. It is the first developer to be both ISO 9001 certified in France.

Function : Designer

Kengo Kuma & associates

16 rue Martel - 75010 Paris (0144889490)

http://kkaa.co.jp/

Architect and engineer, Kengo Kuma is a graduate of the University of Tokyo. After a degree at Columbia University, he founded his architecture firm, Kengo Kuma & Associates in 1990.

Function : Assistance to the Contracting Authority

Manaslu Ing

http://manaslu-ing.com/

MANASLU Ing. Is an engineering and consulting company with a strong technical expertise in the fields of building energy and based on an original methodology developed by the CEA INES.

Function : Others

NEDO (New Energy and Industrial Technonology DevelopmentOrganization)

NEDO is a Japanese public agency, equivalent to Ademe in France, responsible for supporting innovation and R & D in new forms of energy and environmental and industrial technologies.

Function : Manufacturer

Toshiba

http://www.toshiba.fr/

Toshiba was selected by NEDO as an industrial partner for the coordination of the various projects constituting the demonstrator Lyon Smart Community

Energy consumption

Primary energy need : 14,00 kWhep/m².an
Primary energy need for standard building : 28,00 kWhep/m².an

Calculation method :

Breakdown for energy consumption : /!\ The energy consumption is calculated for the entire HIKARI island! The HIKARI assembly should consume between 50 and 60% less than the standards of the current thermal regulation.

Envelope performance

More information :

Structure: Concrete elements that are judiciously sized and positioned have the capacity to store and restore in a controlled manner the free heat or cold energy, in coordination with the natural ventilation of the premises.
The facades are largely glazed with wood / aluminum structures on the ground floor, with exterior insulation.

Joinery: wood or aluminum with thermal bridge cutters

More information

HIKARI is designed to consume approximately 1400 MWh and produce about 0.2% more.

Systems

Heating system :

Combined Heat and Power
Solar thermal

Hot water system :

Solar Thermal

Cooling system :

Gas absorption chiller
Canadian well

Ventilation system :

Canadian well

Renewable systems :

Solar photovoltaic
Heat pump (geothermal)
Biomass boiler

On-site energy production:

- A cogeneration plant in vegetable oil and a photovoltaic plant. Total production of 476 MWh, equivalent to the consumption of approximately 160 households. It covers 80% of the electrical requirements and more than 90% of the heating needs.
- Photovoltaic panels: they transform the solar energy into electricity. They cover the balance of the electrical needs of the island.
- Absorption machine: production of chilled water, from the heat of cogeneration and the cold of the water table. It covers 80% of the cold needs of offices and shops.
- Geothermal: draws freshness in the waters of the Saône and participates in cooling.

Smart Building

BMS :

Centralized management of building parameters: BEMS (Building Energy Management System)

Users’ opinion on the Smart Building functions : cf. product

Urban environment

Land plot area : 15 000,00 m²

The Hikari islet is at the crossroads between the first development phase of Lyon Confluence and the new district of the Marché Gare developed by the architects Herzog & de Meuron. Located at the corner of Charlemagne and Place Nautique, Hikari benefits from the very high quality environment of the Sainte-Foy-Lès-Lyon hill.

Product

BEMS (Building Energy Management System)

Toshiba

Jessica Boillot ([email protected])

http://www.toshiba.fr/

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The BEMS (Building Energy Management System) is the centralized management of the building's parameters, which allows to regulate the production of hot or cold, as necessary, in a synergetic way with the optimized use of point energy overproductions (Cogeneration, energy storage, energy recovery, etc.).

This BEMS, which favors the use of biomass (rapeseed oil) and therefore the economy of primary energy consumption, restores a statistical profile of the whole island over the year synthesizing production and consumption.

The demonstration and monitoring phase which will follow the delivery of the building will cover and analyze all available parameters in order to adjust the technical factors of the island and its equipment to make it actor of its behavior and its energy strategies, And this in the service of the control of energy and the economy of consumption.

BEMS (Building Energy Management System)

The BEMS (Building Energy Management System) is the centralized management of the building's parameters, which allows to regulate the production of hot or cold, as necessary, in a synergetic way with the optimized use of point energy overproductions (Cogeneration, energy storage, energy recovery, etc.).

This BEMS, which favors the use of biomass (rapeseed oil) and therefore the economy of primary energy consumption, restores a statistical profile of the whole island over the year synthesizing production and consumption.

The demonstration and monitoring phase which will follow the delivery of the building will cover and analyze all available parameters in order to adjust the technical factors of the island and its equipment to make it actor of its behavior and its energy strategies, And this in the service of the control of energy and the economy of consumption.

Water management

The rainwater evacuated from the roofs is recovered in a tarpaulin in the basement for reuse for watering green areas and in the toilets of the offices.

Comfort

Health & comfort : The comfort of the users was conceived from the design through the search for an island housing / offices / businesses, with positive energy, functional and spacious. The comfort of the user is based on the availability of a service of home automation (innovation developed by our partner TOSHIBA). Thus users have the possibility to control the comfort and safety equipment and to benefit from a centralized management of heating and lighting but also to have an instrument of control and energy management.

GHG emissions

GHG in use : 1,80 KgCO₂/m²/an

Methodology used :

The overall objective is a reduction in the carbon footprint. In order to do this, HIKARI proposes a low-carbon performance by establishing a carbon pre-balance sheet that has allowed two labels to be established: gray energy label, climate label.

GHG Cradle to Grave : 1,80 KgCO₂ /m²

Studies show that HIKARI is classified in Category A in CO2 emission according to BEPOS (1.8 kg-eq CO2 / m².an <5 kg-eq CO2 / m².an)

Life Cycle Analysis

Eco-design material : The choice of materials and the durability of the envelope, aimed at the energy efficiency of the building. Specific reflection on architectural choices (design, mobility) and positioning of buildings in order to minimize energy consumption and CO2 emissions A particular attachment to the choice of materials was made in a logic of "Cradle to cradle" in order to minimize the carbon footprint of the operation and allow the recycling as long as possible of the materials used.