Page 24 - ZEB AnnualReport 2015

POWERHOUSE KJØRBO

Bjørn Jenssen (SKANSKA)

The project Powerhouse Kjørbo consists of One of the goals of the project was to make equivalent electricity through the use of
a total refurbishment of two ofice blocks in an energy positive building by compensating the primary energy factors throughout the
Sandvika, Norway. The original buildings were for the energy demand for the production of buildings’ expected lifetime .
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built in 1979, scenically situated close to the materials and components, construction, and
outlet of the river Sandvikselva. energy for operation. As well as end-of-life The equivalent yearly embodied electricity for
treatment with on-site production of renewable all materials used throughout the buildings’
Powerhouse Kjørbo is the irst project to be energy. Another important goal was the expected 60 year lifetime (after total
realized by the Powerhouse Collaboration, achievement of BREEAM outstanding, with refurbishment) is estimated to be 61,716 kWh/
consisting of Entra Eiendom, Skanska, a good indoor environment as one of several year (11.91 kWh/m /year). The equivalent
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Snøhetta, the environmental NGO ZERO, the objectives. In addition, proitability was a key yearly embodied electricity for the construction
aluminium company Hydro, the aluminium objective for all the parties involved in the and transport of materials is calculated to be
proile company Sapa, and the consulting project. 7,082 kWh/year (1.37 kWh/m /year).
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irm Asplan Viak. The main objective of the
Powerhouse Collaboration is to demonstrate Life cycle analysis was used to establish the The measured irst year energy demand
that proitable, energy-positive buildings are primary energy balance. It was used actively for operation and the energy production
possible - also in Norway. throughout the interdisciplinary and iterative matches well with calculated values from
design process to ensure decision making design. Total measured irst year energy use
Refurbishment work started March 18. 2013 based on a lifecycle perspective . 1 for ventilation, space and tap water heating,
and the project was completed and handed cooling, ventilation, and circulation pumps
over on February 5. 2014. The total heated Embodied energy as well as energy used was 122,542 kWh (23.65 kWh/m ) while the
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loor space that was renovated is 5,180 m . during construction and for transport of predicted irst year use was 121,947 kWh
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materials is calculated as primary energy, (23.54 kWh/m ). When adding energy use for
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but it can be converted to average yearly plug-loads, the measured energy use adds

24 ZEB annual report 2015