Photographer: Tove Lauluten

Økern, City of Oslo, Norway

Økern nursing home was built in 1975 and contains 140 dwellings for senior citizens. The retrofitting project has been completed and the tenants moved in in October 2014. The project used known and well-tried techniques and products, while the innovative part of the project was the process itself and a novel collaboration with research institutes during the design and execution of the work.

Major activities have been additional insulation, minimizing of thermal bridges and the construction of a building with a lower air infiltration rate. These measures have reduced the energy demand for heating by 80%; and all energy for heating now comes from district heating rather from direct electricity as previously. The HVAC system has been altered and variable-air-volume control introduced in relevant spaces, resulting in a heat recovery of 85% and a maximum SFP of 1,5 kW/(m3/s). This has reduced the energy demand for ventilation (except heating) by 70%.

In addition to this, the lighting system was changed to a system with low energy consumption and motion sensors, reducing the energy demand for lighting by 38%. The total energy demand for Økern Sykehjem har thus been reduced by 66 % from 357 kWh/m2year to 120 kWh/m2year.

The techniques and products used to achieve this combine a series of known and well-tried measures within the same project. The innovative part of this project has been the process and the manner in which the owner collaborated with research institutes during the design and execution of the work. This particularly applies to the roof PV plant that was installed, making it Oslo’s largest plant. It is expected to produce 105 MWh annually and will cover 10% of the buildings energy demand.

Read more about lessons learned in the Økern demonstration project here.
For more information, please contact: Flemming R. Idsøe, Omsorgsbygg Oslo KF, e-mail: flemming.idsoe@oby.oslo.kommune.no

Project facts:
The demonstration case is one out for four buildings that are connected to each other. The other buildings were renovated 2000-2010. The buildings are inhabited by seniors and there is a senior activity center in connection to the building. The nursing home is in operation 24/7 and is a working environment of the staff and a home for 140 senior residents. The energy consumption today is approximately 329, 7 kWh/m², the ambition is to cut the energy demand by 68% to 110 kWh/m². The project also includes establishing Norway’s largest building integrated PV-system to deliver 10 kWh/m². The building is owned by Omsorgsbygg and rented out to the city district. Both are part of the City of Oslo.

Updated: 2016-05-13

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