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:    Under construction
Technology:    Electrical heat pump system
Capacity:    1.2MW at 0ºC


Integrating a heat pump system in the existing infrastructure was a natural choice, when Solrød Fjernvarme had to increase their production capacity due to population growth and expansion of the district heating network.

In Solrød, the heat pump absorbs heat from the air. It then transfers the thermal energy using CO2 to facilitate the process. Using CO2 as refrigerant is both efficient and sustainable as CO2 is extracted from the air and has no environmental impact if emitted. The heat pump is furthermore integrated with the district heating plant’s solar heating plant and hot water accumulation tank in an intelligent way. The heat pump helps optimize the return temperature in the solar heating plant thus boosting the overall efficiency of the plant.