Aalborg CSP received an order from the Danish district heating plant Solrød Fjernvarme for turnkey delivery of a 1.2 MW CO2 heat pump system that will support the district heating plant’s transition from natural gas to renewable energy.


Client:       Solrød Fjernvarme a.m.b.a. 
Location:    Solrød/Havdrup, Denmark
Status:    Operational
Technology:    Electrical heat pump system
Capacity:    1.2MW at 0ºC


Tailored to fit individual energy needs and existing system

The order for Solrød Fjernvarme is a turnkey EPC contract consisting of a 1.2 MW CO2 heat pump, expansion of the existing technical building, and integration with the existing system, which includes a 2,569 msolar heating plant and a 1,250 m3 hot water accumulation tank.  
The integrated heat pump system, which is tailored to fit the district heating plant’s specific energy needs, uses outdoor air as the source for heat production and ensures a more flexible energy supply.

Sustainable refrigerant

Besides a sustainable heating solution, the client has likewise selected a sustainable and environmentally friendly refrigerant for their heat pump. The heat pump system uses CO2 as a refrigerant.

Some of the synthetic refrigerants used today, such as HFCs and HFOs, are very problematic for the environment. Over time, parts of these gasses are converted into PFAS, which is considered potentially harmful to humans. Furthermore, these fluorinated greenhouse gases are problematic for the environment as they contribute to global warming. CO2, on the other hand, is an environmentally friendly refrigerant that, in addition to being naturally occurring, is also highly energy efficient. 


  • Design and delivery of heat pump system
  • Design and delivery of pipping (valves, drain, headers etc.) 
  • Design and delivery of civil works
  • Mechanical and electrical installation
  • P&I diagrams and control system
  • 3D model
  • Strength and flex calculations
  • Documentation
  • Supervision of installation and commissioning
  • Legalization of the plant


Andreas Zourellis
VP Sales - International
District heating / industrial solar technologies
Phone: +45 50 30 00 25 
​​​​​​​E-mail: azo@aalborgcsp.com