Aquatic Center Champsaur

Extension + refurbishment

  • Building Type : Swimming pool
  • Construction Year : 2016
  • Delivery year : 2016
  • Address 1 - street : 05500 SAINT BONNET EN CHAMPSAUR, France
  • Climate zone : [Dfb] Humid Continental Mild Summer, Wet All Year

  • Net Floor Area : 1 957 m2
  • Construction/refurbishment cost : 3 500 000 €
  • Cost/m2 : 1788.45 €/m2
  • Primary energy need :
    2100 kWhep/
    (Calculation method : RT existant )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

This aquatic center was created from the old village pool which only worked in the summer: it is now ope all year long as it is roofed now. To reduce energy consumptions, the principles of bioclimatic architecture have been met:

  • passive pool should receive maximum sun: the new roof is transparent and made ​​Texlon, allowing to benefit from the light and heat of the sun. The walls are fully glazed, offering swimmers a magnificent view of the Alps.
  • high insulation and airtightness reduce condensation and able to implement an efficient system involved not only appropriate times.
The energy production were also given special consideration to consume as little as possible and recover waste energy:
  • thermodynamics dehumidification: use of indirect heating with absorption chiller to dehumidify principal.

  • the valuation of the "heat rejection" from the machine that heats the pool water showers and water basins.

All these solutions have helped to drastically reduce the energy consumption of the aquatic center and the luxury of swimming under the sky   Hautes-Alpes with views of the mountains Champsaur in   winter and summer.

Sustainable development approach of the project owner

A swimming pool is as a consumption gap. Moreover, the absence of thermal regulation makes it the most energy consumer of all building up to 2800 kWh / m² of water for existing pools! Our goal: Leverage our expertise to improve the energy performance of these energy efficient buildings, where considerable progress channels are inventing in the general interest (energy and pollution).
This aquatic center has been designed by combining building performance (passive building, building insulation and beaches ...) and facilities offered (cover pools, dehumidified fi thermodynamics cation with recovery of heat), to achieve a gain energy 50% compared to conventional pool dehumidification operating with a modulation of the fresh air flow. Performance indicators covered were: - 1500 kWh thermic / m² pool (thermal blanket) - 150 l / day / bather - 850 kWh.electricity / m² pool (with natural lighting)

Architectural description

The passive pool should receive maximum sunlight. The transparent roof made Texlon Solar brings the capital element of passive architecture: more light and more free solar gain. It consists of airbags, themselves composed of 3 or 4 layers of ETFE. A fully transparent cover has not only advantages, especially in summer when the sun hits at an almost vertical angle. It is therefore essential to control solar gain using active climate control systems which modify the transmission depending on external conditions and domestic needs. Similarly, high insulation and air sealing to reduce condensation and able to implement an efficient system involved not only appropriate times. The lobby is surprisingly coverage betraying in its totality the sky and its fully glazed walls on sunny facades. These two elements are involved in technical choices together they bring a quality of remarkable nautical space: luxury to swim under the sky of the French Alps with views of the mountains Champsaur, in winter and summer.


    Thermal consultancy agency

    AILLAUD Frères

Contracting method

Separate batches

Energy consumption

  • 2 100,00 kWhep/
  • 2 800,00 kWhep/
  • RT existant

    Part dehumidification / basins lobby Ventilation represents 54% of overall energy consumption.

  • 1 800,00 kWhep/

Envelope performance

  • 0,57 W.m-2.K-1

More information

Before the works, basins were discovered. There were dehumidification system. Energy consumption only corresponded to heating the pool water.


    • Individual electric boiler
    • No domestic hot water system
    • No cooling system
    • Nocturnal Over ventilation
    • Double flow heat exchanger
     Deshumidification thermodynamique par une machine absorption
    • No renewable energy systems

Smart Building

    Establishing a brand TREND Centralized Technical Management. This Centralized Technical Management tracks the performance indicators.

Biodiversity approach

    Located in the heart of the Alps, the aquatic center offers panoramic views of the mountains of the Champsaur. It was approximately 1000 meters and is part of the municipality of Saint Bonnet


    Absorption Machine



    HVAC, électricité / ventilation, cooling

    The interest of this thermodynamic dehumidification system through an absorption chiller:
    - Washing absorption whose lifespan is 21 to 25 years instead of 7 to 14 years for an electric compressor (base: 5000 to 6000 h operating on 8300 h per year).
    - Refrigerating fluid used matching of water mixed with lithium bromure (nontoxic sea salt and not rated Kyoto) while with a compression solution, uses an Hydrochlorofluorocarbon refrigerant whose future is uncertain because of environmental problems that entails.
    - No special equipment room or transformer as compression solution.
    - Cost P2 + P3 + operating lower P4.
    - Cost Of lesser works.

    In addition to the savings of energy made, the fact of not having to use a refrigeration but a service technician having been formed in a few days to realize a random empty every 2000 hours (approximately 3 procedures per year ) and reduced maintenance costs have convinced the Owner.

Construction and exploitation costs

  • 350 000
  • 3 550 000

Reasons for participating in the competition(s)

​L’objectif de la rénovation est la diminution des consommations d'énergies de 50% par rapport à l'existant par la mise en place :

  • D'une déshumidification thermodynamique (grâce à une machine à absorption)
  • De la couverture des bassins,
  • D'un renforcement de l'isolation

Les avantages sont importants : absence de fluide frigorigène classé Kyoto, fiabilité, performance thermique et récupération de chaleur avec une efficacité thermique supérieure à 2.

Avec les performances du bâtiment (bâtiment passif,isolation du bâtiment et des plages,…) et des équipements proposés (couverture des bassins, déshumidification thermodynamique avec valorisation de la chaleur), le gain d’énergie est de 50 % par rapport à une piscine classique fonctionnant avec une déshumidification par modulation du débit d’air neuf.

Building candidate in the category

Energy & Temperate Climates

Energy & Temperate Climates

Users' Choice Award

Users' Choice Award

Green Building Solutions Awards 2016

Author of the page

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    Green Building Solutions Awards 2016