Cercle des Nageurs de Marseille - France

Issue

Sustainably meet the heating and cooling needs of local authorities, developers, and building managers, which are all heavy energy consumers.

The customer's objective

The Cercle des Nageurs de Marseille wants to make major energy savings in heating its prestigious 3 000 m³ Olympic pool and pre-heating its domestic water, and it favours a 100 % renewable energy supply.

Veolia's solution

Recover the calories in wastewater through the proprietary Energido® process. By capturing waste heat produced by urban facilities in the vicinity of the equipment (wastewater collection systems), fossil fuels can be replaced by renewable resources from a permanent (wastewater) rather than intermittent energy source (solar, wind, etc.).
 

Innovation

The Energido® process allows some of the wastewater from a wastewater collection system (collector) to be diverted to a heat exchanger installed outside this network.

1. Wastewater from the collector is pumped and directed to a heat exchanger. This spiral-shaped device, in which circulates brine (a heat conducting fluid), recovers approximately 5 °C by heat exchange.

2. The cooled wastewater is returned to the network downstream of the collector.

3. The heat exchanger is coupled to a new closed-circuit loop which supplies a water/water heat pump.

4. The heat pump is in turn connected to two circuits: one maintains pool temperature at 27 °C all year and the other preheats domestic water to 35 °C before being heated to 55 °C by a gas boiler.

Technologies

The infrastructure equipping the CNM generates 250 KW to heat the pool's water and maintain it at 27 °C all year round.

Thanks to this heat input, the heat pump connected to the system has an average efficiency of 1:5, i.e. for an energy consumption of 1 kWh, 5 thermal kWh of energy is produced.

Ideal for heating swimming pool water, Energido® is reproducible for a variety of uses, including heating and cooling homes and offices. Other aquatic centres, such as Aquarena in Arras or Aqualac in Aix-les-Bains, have already adopted the solution for their heating needs.

Customer benefits

Saving

• Annual energy bill (gas and electricity) nearly halved

• Fossil fuel consumption reduced by 75 %

• Process eligible for the ADEME Renewable Heat Fund (up to 40 %) for installation costs and reduced VAT for the sale of heat

Environment

• 230 tonnes of CO₂ avoided/year

• Replacement of energy from greenhouse gas-emitting fossil fuel with a renewable energy in a local loop.