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New geothermal district heating system near Paris to start in December 2017

View over Dammarie-lès-Lys, France (source: Dammarie-lès-Lys municipality)
Alexander Richter 14 Nov 2017

Geodalys and Engie are about to start a new geothermal district heating system in Dammarie-lès-Lys, a municipality in the south-east of Paris, France.

Local news report that green light has been given for a new geothermal district heating system in Dammarie-lès-Lys, a municipality in the south-east of Paris, France.  The nearly 6 km long heating network is expected to be put into service in December 2017.

Tests carried out by operator Géodalys this month were successfully passed and give the green light for the first heating season. The system has been developed by Geodalys and Engie and will produce heat from water pumped from underground.

The distribution network required some major construction work, putting piping to schools, gymnasiums, fire station, the city hall but also a nearby shopping center. Pumped at 2,000 m depth, the water is extracted at 71 degrees Celsius with a flow rate of 350 qm/ hour.

An important device for heat exchange comes into action and feeds the network in a closed circuit. “This pumping station and reinjection is in connection with the gas boiler of the plain of Lily and allows, in case of great cold to make a supplement in heating, explains Jean-Christophe Gabrielli manager of operation of this geothermal heating plant. But the goal is to fuel up to 85% of the local demand by geothermal energy.

In case of a breakdown, the new plant is coupled with that of the Almont which could take over in the event of a possible incident. According to the operator, the new geothermal district heating system significantly reduces CO2 emissions, but also helps abolish the challenges of the fluctuations of prices of fossil fuels.

“Connected buildings will benefit from heating and domestic hot water at a cost optimized and controlled,” he concludes.

Source: Actu.fr