Cooling Buildings with Seawater

Copenhagen’s two district cooling facilities distribute and supply cold water to commercial and industrial buildings with large server rooms or where many people work or shop. The district cooling system uses seawater from the Copenhagen harbor throughout the year to cool the pipes in the system. During the winter months, seawater from the harbor is cold enough to eliminate the need for electricity in the cooling process. In summer, when the temperature of the harbor water exceeds 17 degrees Celsius, it is still used to increase the efficiency of other industrial processes, for example to chill cooling compressors.

“We see a tremendous potential in district cooling, because it gives the customers a number of economic and environmental benefits.”

Henrik Lorentsen BøgeskovCEO, Hofor Fjernkøling

Apart from being a clean and sustainable source of cooling, the system also takes up less space, and is less noisy, expensive and energy-intensive than conventional compressor-based air-conditioning.

Why you should care

Most conventional cooling systems use large amounts of electricity, often generated from non-renewable sources, to cool buildings. The district cooling system in Copenhagen provides a sustainable alternative to the status quo. The system can cool 1.9 million square meters in Copenhagen, and is a step towards making the city CO2 neutral by 2025.

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