This first part of ecodistrict gathers 7 buildings of dwellings, offices, a nursery; representing almost 20000 m2.
The district heating system, specific to this ecodistrict is quite innovative. It is based on the treated water rejected by a water treatment plant located 500 m far from the ecodistrict.
This water is used as the cold source of 8 heat pumps for domestic hot water production and 5 heat pumps for heating and cooling.

Key facts

Buildings (7) Heat pump and source
Location Nice, France
 Number of HP 8 x 12kW HP for DHW & 5x HP for heating / cooling
Construction 2012 Installed power unknown
Heat distribution collective Operation mode unknown
Heated area 280 dwellings Heat source treated water from water treatment plant
Level of insulation very good
Heating system Domestic hot water
Type of system central Type of system central
Max. temperature 45 °C Max. temperature 55 °C
Hot water storage 17.000 l
Other information
Substations 4 Investment costs 1 M€ for geothermal installation
Consumption for DHW, heating, cooling 40 kWhep/m²a
 Renewables ratio 69%

Description of the technical concept

The system consists of:

  • Boreholes to collect the treated water (the water is collected at a temperature ranging from 12°C to 25°C and rejected at a temperature between 7°C and 30°C)
  • 5 medium temperature (45/40°C) heat pumps (CIAT Dynaciat®) for heating and cooling (distribution is ensured by fan heaters)
  • 8 high temperature (65/60°C) heat pumps (Heliopac Solerpac®) for domestic hot water production.
  • Water tanks for domestic hot water storage (17000 liters)

Case Study Sheet FR Nice