Heat pump for biomass heating systems

Providing heat in a climate-friendly way

Absorption heat pump for biomass CHP Klagenfurt East

Klagenfurt's district heating network, with a pipeline length of around 165 km, is operated by Energie Klagenfurt GmbH and supplies around 27,000 connected customers. The absorption heat pump uses the heat from the flue gas of a biomass cogeneration plant as a low-temperature heat source and feeds heat into a district heating network. The heat pump was supplied and installed by SOLID.

At our reference project in Klagenfurt, Austria, we use 8 MW from the exhaust gas condensation of a biomass CHP boiler, total power of 52 MW, at 45°C. On high temperature side, the absorption heat pump is supplied by 12 MW at 130°C. This leads to district heating feed-in temperature of 75°C at 23 MW.

As return is below 60°C in winter, a temperature spread of over 15K is reached. In winter district heating has a flow temperature of up to 120°C. So the absorption heat pump heats up from 60°C to 75°C and the biomass boiler from 75°C to 120°C.

Technical Specifications


Heating Capacity
23 MW

Any questions?

Click on the button and we will be happy to help you!

More success stories

Dairy industry in California

Dairy Industry in California produces a wide range of high-quality dairy products for private label, foodservice, industrial and export markets. The company wanted to replace a portion of its energy needs with renewable energy sources. SOLID implemented an effective, long-term and sustainable solution.

Read more »
The latest updates

Subscribe to our newsletter

Green news: Latest trends in the spotlight