Vela Verde building

Extension + refurbishment

  • Building Type : School, college, university
  • Construction Year : 1987
  • Delivery year : 2022
  • Address 1 - street : 29 avenue Général Leclerc 69007 LYON, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 3 100 m2
  • Construction/refurbishment cost : 4 500 000 €
  • Cost/m2 : 1451.61 €/m2

Proposed by :

  • Primary energy need :
    65.52 kWhep/m2.an
    (Calculation method : RT existant )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

Transformation of an office building into a 3rd category ERP higher education school with the aim of achieving excellent level HQE certification . All available existing surfaces are used to contribute to urban densification and reduce urban sprawl. The project integrates a biosourced elevation on R+8 associated with the establishment of a plant terrace and a vegetable garden and an extension in the basement for the creation of living spaces with a supply of natural light and the creation of patios .

The project is part of a low-carbon and circular economy approach (reuse, biosourced, geosourced, recycled or recyclable products) and calls on local players. It is suitable for summer heat waves in urban areas (cold production up to 55°C compared to +- 35°/40°C for conventional heat pumps) with extreme temperatures expected in the coming decades. It contributes to the reduction of heat islands by adding green surfaces at the foot of the building and on 3 terraces.

The energy process mixes a low tech and high tech design. It incorporates a technological innovation developed in France 20 km from the site: a greenhouse gas-free heat pump (negative GWP - Global Warming Potential) installed on the roof which covers 70% of the building's needs, which operates without electrical resistance and which stores heat in winter and cold in summer. This Pac is coupled with double flow ventilation and an adiabatic unit (passive cooling). A self-consumption photovoltaic plant on the roof contributes to smoothing the electrical consumption of the process. It anticipates the tertiary decree and presents a gain in energy consumption > 60% compared to 2010. The building is connected for overall performance monitoring (energy, water, indoor air quality) with open access to users. Finally, it integrates an educational approach intended for the actors of the building site (increase in competences), the future students of the school and the local residents.

Photo credit

Campesi

Contractor

    Arioste Promoteur

    Marc Pigeroulet : marc.pigeroulet[a]arioste.fr

Construction Manager

    Diagonale Concept

    Marc Campesi : dg.jhabitelaterre[a]gmail.com

Stakeholders

    Designer

    Sophie Sturlèse : sophiesturlese[a]free.fr

    Filing of the building permit (modification of facade and change of destination)

Contracting method

General Contractor

Energy consumption

  • 65,52 kWhep/m2.an
  • 99,02 kWhep/m2.an
  • RT existant

    Heating (electric) Cep = 21,1 kwhEp/m² (in French)
    Cooling (electric) Cep = 6.35 kwhEp/m² (electricity)
    Lighting (electric) Cep = 11.69 kwhEp/m² (electricity)
    Auxiliary (electric) Cep = 4.22 kwhEp/m² (electricity)
    Ventilation (electric) = 24.41 kwhEp/m².
    Photovoltaic (electric) Cep = 2.26 kwhEp/m².

  • 187,12 kWhep/m2.an

Real final energy consumption

    25,40 kWhef/m2.an

Envelope performance

  • 0,40 W.m-2.K-1
  • Composition of the envelope :

    WALLS
    - Basement wall (interior insulation, biofib'Trio) U = 0.241 W/m².°C
    - Exterior wall on west and north facades (exterior insulation, rock wool + brick or ceramic cladding) U = 0.229 W/m².°C
    - Exterior wall East facade (interior insulation, biofib'Trio) U = 0.241 W/m².°C
    - Exterior wall on R+8 elevation (wood frame with Biofib'Trio insulation) U = 0,187 W/m².°C
    - Interior wall on unheated room (Biofib'Trio) U = 0,236 W/m².°C

    CEILINGS
    - R+8 / R+6 / R+1 terrace ceiling: reused compressed polyurethane insulation
    - R+7 terrace ceiling: 30 cm Biofib'Trio insulation

    FLOORS
    - floor on outside U = 0,237 W/m².°C
    - interior floor on unheated premises U = 0.271 W/m².°C
    - floor on ground level U = 0,003 W/m².

    The building envelope combines a controlled inertia with a strong external insulation of the facades (14 cm) dressed with a terracotta and ceramic facing which slows down the heat transfer in summer.

    Solar factors of the external joineries (without taking into account the solar protections)
    - vertical windows Sw = 0,35
    - horizontal windows Sw = 0.15

    The external solar protections on the exposed facades (West) are optimized to let the sun through in winter and to limit the solar gains in summer.

Systems

    • Heat pump
    • Other hot water system
    • Reversible heat pump
    • Nocturnal Over ventilation
    • Double flow heat exchanger
    • Other, specify
    • Heat pump
  • 3,00 %
  • Greenhouse gas free (GWP <1)

    - a self-consumption photovoltaic plant that will smooth out the consumption of the heat pump
    - an energy storage module (hot and cold) of 14 kWh integrated in the heat pump which is recharged thanks to the self-consumption PV plant

    - adiabatic module for passive cooling of the extracted air from the double flow AHU which cools the incoming air
    - swinging windows (except on the firemen's facade)
    - night over-ventilation (building with high inertia)

Smart Building

    The shutters are controlled by facade and level blocks in order to take into account the differentiated solar gains between the West and the East and the lower / upper floors of the building. Usage scenarios can also be set.
    Air quality sensors are distributed in the building.
    The air handling units have internal alarm systems that inform in case of defect or need of maintenance (filter change for example).
    Some doors have access controls that inform the operator when they are not closed.
    Access to this data will be online for public access users with a custom designed ergonomic interface.

    The online data of the PV plant is accessible on a digital platform with an ergonomic interface.

GHG emissions

  • 3,07 KgCO2/m2/an
  • Perimeter covered: all the building's energy consumption items (RT items, non-RT real estate, and furniture)

    Standard: HQE

    Calculation method: The CO2 emission factors for the energy consumed are those taken from Appendix 3 of the "Energy-Carbon" standard for new buildings, expressed in kilograms of CO2 equivalent per kilowatt-hour of final energy.

  • 50,00 an(s)

Life Cycle Analysis

    The LCA diagram of the building is underway (to be delivered by the end of July 2022).

Resiliency

    • Inondation/Crue lente
    • Séisme
    • Îlot de chaleur urbaine

Water management

  • 1 608,00 m3
  • HQE reference method for calculating annual water consumption from the network.
    Water quality analysis by a laboratory

Indoor Air quality

    9 sensors and online access for users

    • fine particles, CO², hygrometry, temperature, noise ;
    • 3 CTA equipped with filters ;
    • a preventive approach on low-emission materials (A+ label, EC1+ label, Excel, Floor Score) ;
    • post-operational monitoring with critical threshold alerts.

Health & Comfort

    To guarantee the health and comfort of the inhabitants, here are the strategies put in place:

    • A fitness trail staircase ;
    • The creation of a "ZEN" break room without electromagnetic field and soft light ;
    • The creation of an educational vegetable garden with an introduction to permaculture on R+8 ;
    • The creation of green spaces planted at the foot of the building with pedestrian seats and 3 accessible vegetated terraces ;
    • The creation of 125 bike and scooter spaces in the building ;
    • The choice of heat pump on the roof with low noise emission to reduce noise on the roof.

    In order to guarantee the comfort of use of the premises in occupation the objective is to contain the reverberation time to a value below 0.8 seconds. These values are, in the case of the regulation for speech frequencies, i.e. covering the octave bands from 500 to 2000 Hz.

    To achieve these objectives, false ceilings with high acoustic performance have been installed.

    The entrance hall is a place of passage particularly prone to the effects of noise. This is why it has benefited from an additional acoustic treatment provided by a treatment of wood panels and biosourced acoustic insulation on the ceiling and walls. A planted wall also contributes to the acoustic comfort of the entrance hall.

    Dans chaque pièce du bâtiment il y a un très bon apport naturel et celui-ci permet d’être caractérisé comme « non éblouissant » car les FLJmoy sont supérieurs à 1,2 dans les bureaux et les salles de classes, mais ne sont pas trop importants car les FLJm

Product

    Greenhouse gas-free heat pump with cold and hot energy storage

    Veotherm

    Génie climatique, électricité / Ventilation, rafraîchissement

    The VEOTHERM heat pump is an innovative solution that meets the current challenges imposed by climate change: ensuring the thermal comfort of building users while limiting the impact of heating and air conditioning equipment on the environment.
    This heat pump operates over a temperature range of -35°C to +55°C and thus enables the building to be cooled whatever the outside conditions, including during heat waves. In addition, it has an excellent energy efficiency as shown by its A++ energy rating.
    It allows the storage of thermal energy (heat and cold) thanks to the presence of phase change materials. This energy is free and produced mainly by the photovoltaic plant when it is not required.
    This heat pump does not emit CO2 or other pollutants and its refrigerant has a GWP (Global Warming Potential) < 1.
    It does not require electrical resistance in winter.
    It generates little noise pollution: its sound level is around 42 dbA at full power.
    The VEOTHEM heat pump can also be coupled to a direct current photovoltaic power supply.
    It is locally manufactured: less than 20 km from the project, with a very high reparability index that limits dependence on imports.


    Adiabatic

    Souchier Boullet

    01 60 37 79 50 / 01 60 37 79 89

    Génie climatique, électricité / Ventilation, rafraîchissement

    The cooling of the interior of buildings is a major issue because it is associated with an increase in the use of air conditioning, which causes an increase in energy consumption.

    ADIABOX NFG is a passive cooling solution by evaporation. Before using the heat pumps to cool the building, the adiabatic system will lower the temperature of the air blown by the double flow AHU by 5 to 6 without energy.
    When hot air comes into contact with water (present in the wet exchanger of the equipment), it causes evaporation. The energy required to evaporate the water is extracted from the air, which then cools down. The efficiency of such a system increases with temperature (since an increase in temperature is accompanied by a decrease in relative humidity).

    This cooling system makes the electrical consumption of the equipment negligible compared to a mechanical system equipped with a cold water coil. Its water consumption is also reduced. Rainwater could be recovered in a future approach.
    Its operation does not require any refrigerant gas and therefore does not generate any pollutants.

    The design of the equipment is very simple and thus greatly reduces the risk of breakdown. Only a circulation pump, a water inlet solenoid valve and a drain valve are necessary for its operation. It has no compressor or high pressure refrigeration circuit.

    The health of the users is also favored by a healthy blown air without micro-droplets and thus without risk of micro gutter.


    Double flow air treatment unit (energy recovery)

    France Air

    Génie climatique, électricité / Ventilation, rafraîchissement

    The Powerplay dual flow unit from France Air is a high performance energy recovery system for hygienic and comfort ventilation with preheating and cooling of the supply air. This AHU is coupled with adiabatic on the extracted air to ensure the cooling of the building, as well as on the heat pump to ensure the heating of the building.
    The health of the users is preserved thanks to the optimal quality of the blown air ensured by the pre-filtration and filtration of the fine particles ISO ePM1 80%.
    Its impact on the environment is further reduced by its very low consumption motor and its Eurovent certified rotary exchanger (efficiency up to 90%).


    Biofib Trio thermo-acoustic insulation (hemp, cotton and linen)

    Biofib'

    02 51 30 98 38 / isolation[at]biofib.com

    Second œuvre / Cloisons, isolation

    Biofib'Trio insulation is a thermal and acoustic insulation solution that respects the environment. Its very good thermal phase shift provides excellent comfort in both summer and winter. The hemp of the panels brings a natural regulation of hygrometry to the building.

    Combining hemp, cotton and linen, this material is of natural and renewable origin and thus contributes to the preservation of the biosphere. It is certified as a Biosourced Product.
    The hemp and flax are of French origin and the cotton is recycled.

    Biofib'Trio insulation is a healthy, VOC-free, non-allergenic and non-irritating product that contributes to the preservation of users' health, as evidenced by its A+ health label.


    plates coals

    MAPEI

    Gros œuvre / Structure, maçonnerie, façade

    Mapei's epoxy resin impregnated carbon fiber pultruded sheets are a solution for repairing and reinforcing reinforced concrete elements damaged by physical-mechanical actions. It is an alternative to traditional structural reinforcements based on steel plates which are less environmentally friendly. These carbon plates also have the A+ health label.

    LINA

    Second œuvre / Cloisons, isolation

Construction and exploitation costs

  • 366 000,00
  • 440 000
  • 4 563 000

Urban environment

Near and far environment

The rehabilitated building is located in the heart of downtown Lyon, on the banks of the Rhône, opposite the Confluence district, at the crossroads of avenue Leclerc and rue des Girondins in Lyon 7th:

  • Vela Verde is the end of a linear built sequence of R+7 housing attached to the South gable ;
  • to the north, on the other side of the rue des Girondins, are the buildings of the military base of the Frère General Headquarters ;
  • to the west is Avenue Leclerc and the Berges du Rhône ;
  • to the east, a housing program has recently been built partly attached to the gable of the building.

This building is ideally located within a mixed district in full mutation .

Connected to the city, it is also connected to nature. Located along the quays of the Rhône, it benefits from proximity to the requalified banks, the distant landscape and privileged views of the hills of Lyon .
Access is easy thanks to the proximity of bus stops, Velov' stations and the B Jean Jaurès metro stop, which is only a few streets away. It is smoothly connected to the hypercentre and transport hubs .

 

A complementary program to existing installations

Vela Verde is a project integrated into its neighborhood. It is part of the continuity of the logic of development of the 7th district, echoing the future campus of the green EM Lyon.

In addition, it is close to existing student residences and sports fields that will benefit future students on campus. The establishment of the school will create a socio-economic dynamic beneficial to food, health and catering businesses in the surrounding area.

The existing building is being transformed to meet a new use. This building formerly housing the offices of MACIF will soon house a higher education school. This is a transfer from a school already established in the 7th arrondissement.

In the basement of the building, the parking lots have been converted mainly into 2-wheel parking in order to promote the possible soft movements thanks to the development of the traffic lanes on the upper and lower quays of the Rhône.

The green spaces are increased in order to integrate into the green fabric of the district and enrich it.

 

Vela Verde wants to generate a long-lasting positive local impact, both environmental, social and economic, as well as being a source of inspiration on the scale of the 7th and the city.

Land plot area

782,00 m2

Built-up area

100,00 %

Green space

239,00

Parking spaces

117 bicycle spaces, 5 electric motorcycle spaces, 20 scooter spaces, 30 car spaces

Building Environmental Quality

  • Building flexibility
  • indoor air quality and health
  • biodiversity
  • works (including waste management)
  • consultation - cooperation
  • acoustics
  • comfort (visual, olfactive, thermal)
  • waste management (related to activity)
  • water management
  • energy efficiency
  • renewable energies
  • maintenance
  • building end of life management
  • integration in the land
  • mobility
  • building process
  • products and materials

Reuse : same function or different function

    • Structural works
    • Isulation

    GROSS WORK :

    Gravel - 4 tons

    INSULATION

    Polyurethane foam - 50 sqm

    LIGHTING

    Re-used lighting fixtures (under order)

    The gravel on the roof of the old building has been preserved. They protect the waterproofing and contribute to the aesthetics of the roof terrace (reuse in situ)

    The polyurethane foam, insulator of the old roof, has been kept in part to insulate the terraces and raise the level of the terrace at R+1. (reuse in situ)

    Lumianire made from old window frames reconditioned in France by a professional integration establishment.

Sustainable design

    Recycled materials :

    The PVC tiles used (SAGA² 70 tiles from Gerflor) contain 55% recycled materials.

    Recyclable materials :

    All PVC flooring, including those of the staircase, are 100% recyclable: SAGA²70 and Tarastep 43 tiles from Gerflor. Gerflor has set up the Second Life program, a free collection program for installation scraps and "clean" end-of-life products (unglued and REACH compliant). After collection, the products are sorted and crushed into reusable granules at the Floor To Floor sorting and recycling center. These granules are then recycled in Gerflor's factories and integrated into new products: their second life begins. Glued or non-REACH compliant floors are processed by the complementary recycling program PVC Next. After collection, the waste is sent to the AgPR recycling center (Germany) where it is sorted and crushed into granules that can be reused by other industries.

    The entire interior insulation of the building is made of BioFib' Trio, also 100% recyclable.

    The 250 m² terrace on the ground floor is made of 100% recyclable PVC slats.

    The cladding of the elevation is made of 100% recyclable composite wood (neolife).

    The elevation of the building is also made of regional and French wood structure for the most part and fully reusable.

    The Vela Verde building was designed to be adaptable and to allow for a possible change of use, notably from school to offices or any other activity receiving the public. This ambition is part of the targets retained in the HQE approach.

    Several architectural provisions facilitate changes in zoning, such as false ceilings and the possibility of partitioning rooms. Ventilation, which must be more important in a school than in offices, is also easily adaptable since it would be enough to reduce the flow rates.

    The choice of new materials was mainly oriented towards environmentally friendly and local materials.

    The building contains more than 250 m3 of French biosourced insulation based on hemp, linen and cotton (Biofib'Trio) or wood fiber. More than 1000m² of the exterior insulation is associated with a brick and/or reconstituted stone facing.

    The acoustic panels of the common areas integrate bio-sourced materials (wood fiber).

    All of the constructive additions (patios, skylights, elevations) are made of wood.

    Of all the materials used in the project, 95% are local, French or come from the nearby European Union. 172 insulating wood windows were manufactured locally.

Reproductibility and Innovation

    The cleaning was done by a previous operator before the acquisition of the building by our client.

Economic assessment

  • 250
  • 1 000

Reasons for participating in the competition(s)

Application for the Resilient Buildings Awards 2022

Heat islands are a growing concern in city centers and few solutions are offered in existing buildings. The project is resilient with the choice of a high-performance envelope and a low-carbon, low-energy energy process. It is capable of satisfying user comfort during heat waves and maintaining activity in buildings. Cold storage will limit the operation of heat pumps which only aggravate urban overheating.

Finally, the significant increase in the vegetated surface to the detriment of mineral surfaces contributes to urban refreshment. Rehabilitation is a major issue, our approach is viable and reproducible. The design and manufacture of innovative energy process systems are French with a high repairability index. All maintenance parts are available in France and EU with the exception of a few electronic components.

Building candidate in the category

Prix Tertiaire & Industriel

Prix Tertiaire & Industriel

Trophées Bâtiments Résilients 2022

 building
 eco-renovation
 revegetation
 smart building
 materials and solutions
 biosourced
 energy
 self-consumption
 renewable energies
 photovoltaic
 circular economy
 reuse
 recycling
 competition
 Resilient Buildings Trophies 2022

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