ØKERN NURSING HOME: A MODEL OF ENERGY-EFFICIENT REHABILITATION

Økern nursing home has been a pilot project of energy efficiency and environmentally-friendly rehabilitation of existing buildings. The energy needs of the nursing home have been reduced by 68% and 33.5% compared with a reference building in accordance with TEK10. 10% of energy needs are covered by solar cells on the roof.

Facts

Project
Økern nursing home

Client
Oslo municipality,
Omsorgsbygg Oslo KF

Location
Oslo

Period
Completed in 2014

Expertise
HVAC, electrical systems, energy and the environment

ASSIGNMENT AND SOLUTION

Upgrading and energy savings in existing buildings is crucial to enabling Oslo municipality to reach its goal of becoming a climate-neutral city by 2050. Nursing homes require a great deal of energy, and many are in need of a significant upgrade. When it was time for Økern nursing home to be rehabilitated, Sweco became involved in HVAC, electrical systems, energy and environmental planning under commission from Omsorgsbygg Oslo KF. Through the assignment we have contributed to the realisation of a technical installation comprising extensive energy-saving solutions.

Solar panels on the roof
Økern nursing home has 10% of its energy needs covered by approx. 800 m² of solar panels integrated in the building. This is equivalent to a nameplate capacity of 130 kWp and an anticipated annual production of approx. 94,000 kWh.

68% reduction in energy needs
The extensive rehabilitation at Økern nursing home has reduced energy needs by 68% compared with energy needs prior to the rehabilitation, and by 33.5% compared with a reference building in accordance with TEK 10. This has been achieved by optimising the climatic shell with post insulation and by sealing and minimising thermal bridges. In addition, a new needs-based, energy-efficient lighting and ventilation system has been installed, as well as local energy production via solar cells. District heating as an energy source constitutes 44%, while solar cells constitute 10%. The energy reduction is distributed as follows:

  • Heating has been reduced from 169 kWh/square metres per annum to 33 kWh/square metres per annum
  • Ventilation has been reduced from 95 kWh/square metres per annum to 25 kWh/square metres per annum
  • Lighting has been reduced from 47 kWh/square metres per annum to 29 kWh/square metres per annum

FutureBuilt – a model project with significant transfer value
Økern nursing home is a demonstration building in the European research project Nearly Zero Energy Neighborhoods, (ZenN). This is a collaboration between the private and public sector in five European countries with a view to demonstrating energy-efficient rehabilitation of buildings. The nursing home is also a pilot project in FutureBuilt, whose vision is to demonstrate that it is possible to develop climate-neutral urban areas and architecture of a high quality. Experience from Økern nursing home has huge transfer value for other developers and municipalities.

Extensive upgrading
Økern nursing home consists of two buildings making up two separate nursing homes. The older part has been previously rehabilitated. It is the main building from the 1970s on four floors and covering 9,818 m² which has now been rehabilitated. The upgrades include:

  • Replacement of roofs, façades, windows and doors
  • Replacement of ventilation systems and conduits
  • Replacement of lifts, cable system and lighting
  • Establishing solar panels on the roof

Photo: Tove Lauluten