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Alpiq Intec - District Heating

Carrier chillers with next-generation refrigerant to power district heating installation in Switzerland.
account_circleCustomer Alpiq Intec
roomLocation Geneva, Switzerland
todayDate 2015

Project description

Carrier has set a new milestone with Europe's first district heating project based on AquaForce® screw water-to-water heat pumps using the low Global Warming Potential (GWP) refrigerant R-1234ze(E), a HydroFluoroOlefin (HFO) with a GWP lower than1*. With its PUREtec™ nearly zero GWP refrigerants, Carrier is dedicated to designing next-generation heating, ventilation and air conditioning (HVAC) systems which have minimal impact on the environment, ensuring full compliance with evolving regulation across European countries. 

ALPIQ chose Carrier products that offer a solution combining the efficiency, the high water temperature and the level of energy-efficicency and controlled carbon emissions required for this unique project. 


The ambitious project of heat recovery for a district heating solution in Plan-les-Ouates, led by CADZIPLO, is part of an industrial sustainability program led by the city of Geneva, Switzerland. The objective is to demonstrate how projects with public-private financing can strike the right balance between urban development and energy use.

As part of the first phase of the mixed-use real estate project, waste heat from an onsite data center is recovered and re-used to provide heating to local offices and other facilities.

As part of the second phase, the extended installation is expected to provide heating to 3000 apartments within a planned residential zone.

Walter Meier, Carrier's independent distributor in Switzerland, worked closely with CADZIPLO to design a solution which could both fit the specific project requirements and respond to the evolving requirements of Swiss regulation (Orrchim) and European refrigerant regulation.

A solution based on PUREtec, Carrier's next-generation low GWP HFO refrigerants, was able to address both challenges.

Key benefits
  • Long-term compliant solution with evolving refrigerant regulation across Europe
  • High capacity: up to 2.5 megawatts
  • Energy efficiency by using data center waste heat as a heating source
  • Heating temperature up to 65°c
  • Limited impact on global warming GWP <1*
  • 2 x AquaForce® 30XW screw water-to-water heat pumps with PUREtec™ refrigerant
Challenges and Solutions

Carrier found solutions to the project's specific challenges by:

  • Complying with stringent Swiss refrigerant regulations with Carrier's use of next-generation low GWP refrigerant, HFO;
  • Combining reduced low GWP and high efficiency with a heating capacity of 2.5 megawatts;
  • Enabling the capture and re-use of data center energy as district heating source thanks to the large operation envelope of the AquaForce heat pumps with PUREtec refrigerant: up to 65°C.