Fårevejle
- combined wastewater and air-source heat pump for district heating
The case
In Fårevejle, Denmark, a brand new district heating network is heated by a combination of air and wastewater. The wastewater heat pump handles the base load, while the air-source heat pump steps in if the demand exceeds the wastewater system’s capacity.
The heat pump
The heat pump installation consists of two standard H-1800 AW units and one H-1200 WW unit. The wastewater system includes two accumulation tanks from which energy is extracted. Before the water enters a water-to-water heat exchanger, it is filtered through a self-cleaning filter. Additionally, the heat exchanger is equipped with a clean-in-place system, ensuring reliable and stable operation. The wastewater can be cooled down to around 2°C allowing maximum energy to be extracted.
The heat pump was commissioned in 2023 and fully handed over to the customer after commissioning.
Year: 2023
Model:
2 x H-1800 AW · 1 x H-1200 WW
Application:
Air-to-water and water-to-water heat pump
Capacity:
AW: 3.5 MW · WW: 1.3 MW
40°C/70°C hot water (5°C/85% humidity)
Heat source: Air and wastewater
COP: AW: 2.9 · WW: 3.05
Defrost method: Glycol