The exploitation of the place, which should be operational in a few months, has been entrusted to Valvital, the French number two in the spa industry.
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When, at the bend of the 2010s, the idea of reconnecting with the thermal history of Nancy germinated in the mind of André Rossinot, then mayor, the question of energy and that of water, A resource that has become so precious, were not yet at the center of concerns. Three decades later, a large urban thermal pole that plays the environmental sobriety card, created on the site of an unfinished project dating from the beginning of the 20th century century, will open its doors in Nancy. The exploitation of the place, which should be operational in a few months, was entrusted to Valvital, the French number two in the spa industry.
“You do not imagine the number of people who call me to play the guinea pigs during the four months of white walking which will start in mid-December”, launched, Tuesday, Mathieu Klein, mayor (Ps ) from Nancy. Between the idea of a mayor who wanted to relaunch the attractiveness of his city and the realization of a project at 100 million euros, a lot of water has flowed under the bridges! It is a challenge today to open a thermal complex, at a time when the requirements of sustainable development, resource management and energy constraints are more and more pressing!
Not that much, finally, since the water that will feed the 3 230 square meters of basins offering 18 aquatic activity points, baby swimmers to the spa guests who came for rheumatology care, fate hot ground, drawn from the site itself, at a depth of 800 meters, without any sampling on the drinking water network.
“Many assets”
“This project has a lot of assets, notes Nicolas Chabanne, one of the architects in charge of project fluid engineering. It is located in the city center, and not in the countryside or the periphery, so it limits the Movements. But the great luck is that we do not need to heat the water. With this water at 34.5 ° C we are between 25 ° C and 30 ° C for the aquatic and playful and playful part For the thermal part, the care, we are between 34 ° C and 40 ° C. “Nancy Thermal will therefore not have to know the difficulties encountered by certain municipal swimming pools, forced to close their doors due to explosion of heating costs gas.
remains the amount of water necessary for the operation of the complex. Thermal water under close surveillance, used for all basins, whether playful or cure. When all the pools are full, the center uses 4,500 cubic meters in instantaneous! The drawing is within the perimeter of the center. He pumps in a very large water table which goes to Germany, and even in periods of drought the level remains constant. No heat loss, the circuit is extremely short. Once used, water is rejected in the city’s rainwater network.
As for heating the ambient air, the project avoids any consumption of fossil energy. The center is connected to the metropolitan urban heating network, from renewable energies (biomass, recovery of waste, cogeneration). Anne Démians, who has carried out the architectural site, has registered in the rest of the original Art Nouveau construction signed by the architect Louis Lanternier, to which she juxtaposed a contemporary architecture, while rehabilitating some remarkable elements, a round swimming pool surrounded Blue-green mosaics of the most beautiful effect, or joinery of Jean Prouvé replaced in the gallery.
“The building is passive, explains M me demians. It is closed, with concrete walls for thermal inertia, with very few facades compared to the developed surface. The Water, the base of the activity, which arrives hot is free energy. And it is even used several times, recycled for showers after passing through the cure space “. Virtuous to the end, the site even set out to preserve the presence of a small 2 centimeters frog, the Alyte Accountant, of which 385 individuals were captured and released in the neighboring park. They will be under surveillance for the next ten years.