Use of surplus heat has led to substantial energy reductions at Danfoss


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COWI is a leading international consulting group. We provide state-of-the-art services within the fields of engineering, environmental science and economics with due consideration for the environment and society.

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For years, Danfoss has worked to reduce its factories' global energy consumption. To that end, Danfoss and COWI entered into a close collaboration to review energy saving potentials.

Danfoss factories typically require a lot of heat and generate vast amounts of surplus heat. Therefore, an energy saving initiative was implemented, in close collaboration with COWI, focusing on heat pumps and on producing central heating using the low-temperature surplus heat.

The initiative includes a heat recovery project at Danfoss’ main site in Nordborg, Denmark. Co-production of cooling water and central heating on four 500 kW heat pumps reduces annual gas consumption by 1.2 million m³, shaving off 2,700 tonnes of CO₂ emissions and generating an annual saving of DKK 3.4 million (EUR 455,600). This project is a classic case of the green transition in practice, where fossil fuels are replaced with green electricity. In the longer term, a collaboration between Danfoss and the local district heating company in Nordborg could result in the recovery and export of another 3,700 MWh of surplus heat, shaving off an additional 0.4 million m³ of gas and 900 tonnes of CO₂.

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Article Contributions: Danfoss, COWI, Johnson Controls

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