The new airport in Oslo covers an area of 13 kmand includes a variety of buildings, from public spaces to facilities for catering, aviation, hangers and buildings for air-cargo. To provide an efficient and cost-effective heating and cooling sysem, the airport was built on top of Norway's largest ground water reservoir. The groundwater is used for both heating and cooling.

What was implemented

Seven Sabroe piston compressors using NH3 as a refrigerant, provided by Johnson Controls, were installed in the airport. 3 km of plastic piping connect the 18 underground wells (9 warm, 9 cold) with the energy facility. The heat pumps use the warm water wells to store the excess heat produced by the heat pumps during the summer. At the same time, the cooling system uses the 7-17oC water from the cold wells for cooling purposes. In winter time, the warm water is used as an energy source for the heat pumps to provide heat and hot water to all the facilities on the airport.

The heat pumps provide 70% of the necessary cooling requirements of the buildings, and most of it is produced when the heat pumps work in heating mode. The rest is covered by direct cooling from the cold water wells.