Libourne aquatic center

  • Building Type : Swimming pool
  • Construction Year : 2018
  • Delivery year : 2021
  • Address 1 - street : 11 rue de Logrono 33500 LIBOURNE, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 4 637 m2
  • Construction/refurbishment cost : 19 000 000 €
  • Number of Shower/day : 3 000 Shower/day
  • Cost/m2 : 4097.48 €/m2
  • Primary energy need
    6004 kWhep/m2.an
    (Calculation method : Other )
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

Brief description

Like a large pier, the equipment is intended to be an architectural signal among the natural spaces of Lake Dagueys. Visible from the opposite shore, it nestles deeply into the vegetation and integrates it into its design. The three pools, the recreational areas and the wellness center also benefit from wide views of the lake through the west and south facing windows. The building is elevated to place the bottom of the pools above the highest water level, thus protecting it from the risks of flooding and rising water tables

The architecture of the aquatic center is first of all marked by the great height of the sliding tower, a powerful impetus which must not, however, crush the whole. Thus, to respond to it, two faults are arranged in vertical projection and bring breath, greenery and light. The eastern facade, that of the reception, alternates white cubic forms and orangey ochre surfaces embodied by a metallic mesh. Seen from the other side, the western façade reveals the strong presence of the wellness center, white and luminous, between the metallic façades of the pool halls. The silhouette of the entire aquatic center thus becomes perfectly legible: pools, a fitness center, a summer slide area and so many islands of light and greenery facing the lake.

 

What makes it an exemplary sustainable building

Saving of filter water and bathing comfort by ceramic membrane

Savings over 30 years : 

  • 225,000 m³ of water saved or 750,000 300-liter bathtubs ;
  • 610 000 € in water and energy. Hypothesis: cost = 5€ /m³ of treated and heated water.

 

Supply of new water from the lake

Savings over 30 years : 

  • 813,000 m³ of water saved or 2,710,000 300-liter bathtubs;
  • 2.8 M € in water.

The annual water savings represent the annual consumption of 200 four-person households.

100% biomass heating with absorption heat pump

Carbon savings over 30 years: 15,100 tons of CO2 avoided or 151,000,000 km in a Clio, which is equivalent to 3,775 times around the Earth.


Thermodynamic air dehumidification

Advantages : 

  • 40% reduction in energy consumption compared to a solution without thermodynamic air dehumidification ;
  • no electricity consumption ;
  • biomass heating and thermodynamic dehumidification equivalent to 3.1 M€ savings in heating and cooling.

 

Photovoltaic

The electrical consumption of a swimming pool being considerable, the production of electricity by photovoltaic collectors in self-consumption makes it possible to cover 60% of the needs necessary for the filtration and circulation of water in the indoor pools.

 

Sustainable development approach of the project owner

Interview with Jean-Louis Arcaraz, City of Libourne, 4th deputy in charge of sports, safety and prevention, community advisor in charge of sports, published in the July-August 2021 issue of "Archistorm" magazine.

The aquatic center of Libourne, named La Calinésie, has just opened its doors and its pools to the public. Can you go back to its genesis?

The Libourne area, like so many other French territories far from the coast, was strongly lacking in swimming pools and aquatic centers. This paradox had to be remedied. We then initiated a feasibility study seven years ago. More than 100,000 people were contacted by our services to define with them their needs, their wishes, their desires and their visions of such a facility. Very quickly, the image of a hybrid facility combining sports pools and recreational areas took shape in our minds. We visited 17 facilities in France and Europe, including the aquatic centers of Limoges and Saint-Amand-les-Eaux, designed by AP-MA Architecture. Based on numerous observations and feedback, two of our collaborators and I completed our specifications. It was indeed important for us to work in a small team in order to define and follow our project as well as possible. We immediately imagined a facility with swimming pools and sports pools inside, a friendly area sheltered from the sun for children and exceptional infrastructures (stainless steel pool with curves and counter-curves, dizzying slides) outside, large terraces on which to walk and halls in which to enjoy the entertainment of the place for those who do not swim. We then launched a European architectural competition. 35 agencies responded. We selected ten projects, then five. Surrounded by a jury, we elected AP-MA Architecture as the project manager for our future aquatic center. AP-MA's proposal perfectly projected our program and integrated the future facility into its natural environment, a Natura 2000 zone, while bringing its technical expertise to bear on a low-energy architecture.

The Libourne aquatic center stands out for its innovative environmental choices.

We were obsessed with one idea from the start of the project: the use of water from the Dagueys' lake by the aquatic center. What could be more logical than making this link? Obviously, we did not know what a challenge this would be, both technically and administratively. We needed the agreement of the Regional Health Agency, which had never been invited to consider this type of subject. Furthermore, we chose to carry out this project on a self-managed basis and not as a public service delegation. We remain the only ones in charge of the operation of the site, and therefore of the guarantee of sanitary standards. AP-MA, with the support of the Soja engineering firm, designed a very strict technical protocol, based on a water purification unit, then on an ozone and ceramic filtration unit. This technology obviously led to additional costs for the Libournais agglomeration community (Cali), notably because of the digging of tanks in the lake, but this was offset by the water savings: 50,000 m3 per year! The ARS authorizes us to use the water of the lake for the filling of the basins during one year. We hope that after that, we will have the right to use it for other purposes, such as showers, in order to multiply the savings. When you consider that an aquatic center is one of the most energy-intensive architectural programs, there is a lot to be said for it. The energy savings are mainly due to the choice of biomass heating. Our agglomeration community has acquired a forest that will supply 50% of the wood chips over the next three years. The rest will be purchased from a supplier located 30 km from Libourne.

What about the architecture of the place?

The site that I have been visiting daily for months now is taking the shape we dreamed of from the beginning. The architects have designed a building that is attractive to look at and pleasant to live in, with its parallelepipedic volumes, its slits of light and its high frameworks. The aquatic center breathes, is welcoming, and offers the visitor magnificent views of the Natura 2000 zone. The flow of bathers, individuals, schools and others, is optimal, and this is obviously a primordial point in the design of a swimming pool. We finalized the interior design by adding a maximum of plants and colors on the walls, in addition to the furniture and signage provided by AP-MA Architecture. This architecture will make possible the ambition of Calinesia: to go beyond its status of aquatic center and become a meeting place. Thanks to the numerous terraces, thanks to the movable floor of the sports pool and to the presence of bleachers, thanks to the restaurant and the snack bar, we will be able to organize numerous events: exhibitions, projections, concerts, literary meetings. We launched the festivities on June 21st, during the Fête de la musique.


Architectural description

Located on the right bank of the lake of Dagueys, the aquatic center of the community of agglomeration of Libournais is inserted in a zone with strong environmental stake. Part lookout, part boom, part vegetated breakwater, the building retranscribes in its own way the atmosphere of a long-distance embarkation by inviting users to take the high ground before jumping into the water.

 

Dialogue with the landscape

Like a large pier, the equipment is intended to be an architectural signal among the natural spaces of Lake Dagueys. Visible from the opposite shore, it nestles deeply into the vegetation and integrates it into its design. The three pools, the recreational areas and the wellness center also benefit from wide views of the lake through the west and south facing windows. The building is elevated in order to place the bottom of the pools above the highest water level, thus protecting it from the risks of flooding and rising water tables. The relationship with water is not only visual but also vital: the lake feeds the pool, bringing it the water of the pools and the softness of the air of the halls.

 

Horizontality and verticality

The architecture of the aquatic center is first of all marked by the great height of the sliding tower, a powerful impetus that must not, however, crush the whole. Thus, to respond to it, two faults are created in vertical projection and bring breath, greenery and light. The eastern facade, that of the reception, alternates white cubic forms and orange-ochre surfaces embodied by a metallic mesh. Seen from the other side, the western façade reveals the strong presence of the wellness center, white and luminous, between the metallic facades of the pool halls. The silhouette of the entire aquatic center thus becomes perfectly legible: pools, a fitness center, a summer slide area and so many islands of light and greenery facing the lake.

 

Light and comfort

The light and the distribution of the spaces are finely studied to offer the visitor the best possible experience. In the southwest corner, in connection with the leisure pool, a large mineral solarium, for example, takes advantage of the overhang on the lake. In its continuity, the aquatic play area benefits from the shade provided by the fitness center located on the first floor. In the southeast corner, a large lawn with trees isolates the other users from the noisy activities taking place in this sports and recreational area. The metal mesh bathes the entire site, creating soft light effects throughout the day. Inside, it acts as a sunshade, creating the best lighting conditions for the swimming pools.

Building users opinion

"The site, which I have been frequenting daily for months now, is taking the form we dreamed of from the start. The architects have designed a building that is attractive to look at and pleasant to live in with its parallelepipedic volumes, its light slits and its high frameworks. The aquatic center breathes, is welcoming, offers the visitor magnificent views of the Natura 2000 area. We have finalized the interior design by adding as many plants and colors as possible to the walls, in addition to the furniture and signage provided by AP-MA Architecture."
Jean-Louis Arcaraz, interview of June 7, 2021 published in the Archistorm magazine dated July-August 2021.

Photo credit

Geraldine Brunel

Contractor

Construction Manager

Stakeholders



    Construction Manager

    Action Archi Arnaud Architectes Associés

    05 57 51 15 95

     http://www.actionarchi.fr/

    Associate project management




Contracting method

Separate batches

Type of market

Global performance contract

Energy consumption

  • 6 004,00 kWhep/m2.an
  • Other

    Consumption expressed in kWhep.year. Air heating of the halls Wood 251 160 Gas 62,790 Heating of residual premises Wood 47,212 Gas 11,803 Hot water Wood 183,744 Gas 45,936 Heating of water in indoor pools, excluding draining, including absorption heat pump Wood 425,099 Gas 106,275 Emptying of indoor pools Wood 29,710 Gas 7,427 Heating of wellness equipment (hammam, sauna) Electricity 26,884 Heating of water in outdoor summer pools excluding draining Wood 196,666 Gas 49,166 Summer outdoor pool drains Wood 11,200 Gas 2,800 Heating of water in Nordic pools excluding draining Wood 108,972 Gas 27,243 Nordic basin drains Wood 1,120 Gas 280 Absorption HP Wood 1,085,986 Gas 271,496 Total Wood 2,340,868 Gas 585 216 Electricity 26,884 Electricity for specific use: Inside lighting 138,454 Exterior lighting 30 304 Underwater lighting 4,600 Indoor pool water treatment pumps 446,930 Outdoor pond water treatment pumps 85,957 Heating auxiliaries 457 228 Hall and fitness water games 159,600 Outdoor water games 117,072 AHU fans 576 537 Drinking water 77,620 Various 118,244 ozonator 269,537 Refreshment 8,010 Total 2,490,093 Total (excluding water games) 2,213,421

Real final energy consumption

    34,76 kWhef/m2.an

    2 021

Envelope performance

    Wall Steel deck roofs
    Description (int to ext): 140mm Foamglass cellular glass (λ=0.041)
    Uwalls 0.29

    Wall Roof terraces
    Description (inside to outside): Concrete + 100 mm Polyurethane Effigreen Duo (λ=0.022)
    Uwalls 0.22
    ITE (external thermal insulation) exterior walls (plaster on insulation)
    Description (inside to outside) Concrete + 100 mm Roffmate extruded polystyrene (λ=0.029)
    Uwalls 0.27

    Walls Walls on exterior ITE (metal cladding)
    Description (int to ext): Concrete + 100 mm iso facade mineral wool (λ=0.032)
    Uwall 0.30

    Wall Interior walls on technical room
    Description (int to ext): Concrete + 100mm iso facade mineral wool (λ=0.032)
    Uwall 0.30

    Wall Low floor on exterior
    Description (int to ext): Concrete + 150 mm Fibrastyrene (λ=0.033)
    Uwalls 0.22

    Basin hall lower floor wall
    Description (inside to outside): Concrete 20cm
    Uwalls 3.7

    Wall Low floor changing rooms on crawl space
    Description (int to ext): 8 cm insulated heating floor (λ=0.033)
    Uwalls 0.6

    Wall Intermediate floor
    Description (inside to outside): Concrete 20cm
    Uwalls 3.7

  • 0,54

More information

Aquatic centers are not subject to thermal regulations given the specific hygrothermal conditions. art 1st paragraph a - order of 13 June 2008 and art. 1st - order of May 3, 2007 amended by the order of March 22, 2017 (entered into force on January 1, 2018) Primary energy consumption for swimming pools is expressed in kWhep/m²pool.year. Equipment delivered less than a year ago, so the consumption report over a representative period has not yet been carried out.

Systems

    • Heat pump
    • Others
    • Solar thermal
    • Heat pump
    • Other hot water system
    • Gas absorption chiller
    • Double flow heat exchanger
    • Solar photovoltaic
    • Biomass boiler
    • Other, specify
  • 48,00 %

Smart Building

    The site has an imposing BMS. The BMS offers the following functionalities:

    - management and control of technical equipment: heating, ventilation, production of domestic hot water, lighting, water treatment, aquatic activities;

    - centralizes metering (water, electricity, heat, number of entries);

    - data archiving;

    - defect reporting;

    - alarm sent to on-call telephone.

Urban environment

  • 30 000,00 m2
  • 13,00 %
  • 2 000,00
  • Indeed, the planned location, to the north of the town of Libourne, at the heart of the extension of the Economic Activities Park (EAP) of Dagueys, makes it possible to structure the urban development of this developing service district (pole international nautical, beach, restaurants, hotel, bowling, economic park, fitness center). Its proximity to the A89 motorway interchange guarantees easy access for the surrounding towns, the east of the Gironde and the Dordogne department.

    This sector is well served (Calibus urban transport, proximity to the bastide town of Libourne, its services and its TGV and TER train station, direct connection to the A89) and is made dynamic by the presence of several large companies (Ceva, Arena, Schneider Electric), service activities (hotels, restaurants) and recent, high-quality public facilities (lake, promenade, nautical base).

Product

    SOJA Ingénierie

    Cédric Jouan, cedric.jouan[a]soja-ing.fr

     https://soja-ing.fr/

    Management / Others

    SOJA Ingénierie has developed a new water treatment method in order to supply all of the pools of the Libourne aquatic center with water from Lac des Dagueys, located on the edge of the site. Validated by the ARS, this solution was a first in France.

    SOJA Ingénierie entrusted the manufacturing and installation of the equipment to CERT, a water treatment company specializing in aquatic centers, now closed.

    The water taken from Lac des Dagueys goes through different phases of treatment until it becomes clean enough for swimming. The water is first cleared of sludge by a lamellar decantation system. Then, it is filtered by sand. Then, it is filtered through grain activated carbon. Finally, the last disinfection treatment is done by a UV lamp reactor.

    The equipment cost the project owner €421,000 excluding tax. Knowing that normally, a cubic meter of water costs €4 at the Libourne aquatic center, it only costs €1.50 with this solution. The savings expected over 30 years are therefore of the order of 813,000 m³ of water (i.e. 2,710,000 300 liter bathtubs) and €2.8 million.

    The development of this solution perfectly illustrates the challenge of aquatic centers designed by AP-MA: saving electricity and heating energy, but also water.

    This solution was not only accepted by the project owner but, above all, supported by them. Like the other solutions applied in this aquatic center, all oriented towards the economy.

Construction and exploitation costs

  • 19 000 000

Water management

  • 7 788,00 m3
  • 2 350,00 m3
  • There is no rain collection on the project. However, the site has a lake water purification plant near the site to cover:

    - filling the basins and washing the filters;
    - washing the floors;
    - watering of green spaces.

    This is how 27,086 m3 of drinking water are saved per year.

Indoor Air quality

    In an aquatic center, air quality is essential for the comfort of users but also for the proper functioning and sustainability of the complex.

    The air mixing rate is much higher in the hall of the pools so as to allow better air quality. The pool halls are placed under depression in relation to the adjoining rooms in order to prevent the spread of humidity and the more aggressive air of a pool hall.

    A thermodynamic dehumidification system by a heat pump is present . This installation makes it possible to maintain a constant relative humidity while recycling the majority of the air.

    In addition, the use of efficient water treatment equipment makes it possible to limit the production of tri-chloramine in the air. The efficient filtration systems, the ozone disinfection system and the dechloraminators make it possible to reduce the quantity of chloramine present in the pools.

    All of this equipment makes it possible to obtain a trichloramine content in the air of less than 0.2mg/m3.

    Finally, the rate of fresh air per person is higher than the regulations in force, it was planned 60 m3/h per person, for 22 m3/h regulation.

Comfort

    The quality of water in aquatic centers is a major public health issue. It is for this reason that high -performance filtration systems have been put in place. Indeed, ceramic filters have a filtration fineness close to 3 microns, when the filtration fineness of conventional filters is between 30 and 40 microns.

    Coupled with the filtration system, the water is treated and disinfected by an ozone tower and a gaseous chlorine injection system which aims to destroy chloramines before discharge into the pools and provide the regulatory dose of chlorine.

    Particular attention was paid to temperature control in order to avoid the risk of legionellosis and burns on the domestic hot water network. This is produced and stored at more than 60°C, the return temperature of the loop is 50°C minimum.

    Damp rooms have tiled or earthenware floors and walls to facilitate maintenance and cleaning operations.

    In these spaces, siphons are positioned with slopes allowing the flow of water.

    In the pool halls, equipment storage rooms and showers, taps are provided every 15 meters to allow cleaning of the floor.

GHG emissions

  • 44,00 KgCO2/m2/an
  • 30,00 année(s)
  • The GHG estimate was made using the GHG emission ratio by type of production. The ratios are as follows:

    Wood: 32 gCO2/kWh
    Natural gas: 227 gCO2/kWh
    Electricity (nuclear origin): 6 gCO2/kWh

Reasons for participating in the competition(s)

Le centre aquatique de Libourne est conçu par une agence d'architecture, AP-MA, travaillant main dans la main avec un BET technique et fluides, Soja Ingénierie, permettant de significatives économies d'eau et d'énergie, si conséquentes d'habitude dans le domaine de la conception et de la construction d'équipements sportifs publics. Fortement impliquée dans la réflexion environnementale, l’agence AP-MA Architecture œuvre en effet pour une architecture bioclimatique, à faible empreinte écologique et pérenne. 

Pour prolonger les économies d’énergie, l’innovation est une priorité. AP-MA a ainsi été pionnière dans l’usage de technologies de pointe, comme le traitement de l’eau à l’ozone et la production de chaleur par biomasse ou géothermie sur nappe.

Au centre aquatique de Libourne, une nouvelle innovation a été soumise et mise en oeuvre : la potabilisation de l'eau du lac des Dagueys, utilisée pour remplir et renouveler l'eau des bassins, l'arrosage des espaces verts et le lavage des sols.

Voici la description de toutes les technologies utilisées au centre aquatique de Libourne (tout les détails sont disponibles dans la description) :

  • économie des eaux des filtres et confort de baignade par membrane céramique ;
  • approvisionnement en eau neuve depuis le lac ;
  • 100 % chauffage biomasse avec pompe à chaleur à absorption ;
  • déshumidification thermodynamique de l’air ;
  • photovoltaïque.

Building candidate in the category

Users’ Choice

Users’ Choice

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