Denmark's first passive house rehabilitation of apartment blocks
The objective with this project is to demonstrate renovation of buildings to passive house standard,
The objective with this project is to demonstrate renovation of buildings to passive house standard starting with social housing apartment buildings from 1967 in Slagelse and to provide detailed documentation that proofs the long-term sustainability and duration of the solutions as well as end user acceptance. The buildings that belong to Slagelse Boligselskab, has been renovated in the 80ties and is now ready for second renovation due to carbonisation problems with the concrete and because the windows from the 80ties have passed their life time. The apartment blocks in Slagelse have served the time they are designed for, but the basic structures are in good conditions and will support the renovated elements (walls, windows etc.) for another 70 years. It is a major objective of this project to demonstrate that this renovation can turn the building into a low energy house or a passive house with almost negligible energy consumption for heating, and that the additional cost, compared to a renovation according to the present regulation, is limited
The purpose of this project was to demonstrate thorough energy renovation of apartment buildings to passive house standards simultaneously with the extra cost of this renovation was limited seen in a total economic perspective.
The project is based in Gadehavegård The buildings in Taastrup, built in 1979-1982 and partially renovated in 1999. Here the concrete is worn, the windows lifetime has passed, and there are problems with thermal bridges, moisture and mold.
The residential block 9 has in the period autumn 2014 to spring 2015 undergone a thorough energy renovation. The building has got exterior insulation with all façades, new windows, additional insulation of the roof, decentralized ventilation systems and integrated built balconies with folding glass facades.
After the renovation the detailed measurements displays that district heating consumption is reduced by about 30% compared to pre-renovation. The measurements show that the block 9 does not comply with the passive house requirement for maximum consumption of 15.0 kWh / m2. year for heating, since the block consumes 22.7 kWh / m2. year. In contrast, passive requirement of a total energy consumption than 120 kWh / m2. year observed as the total consumption of block 9 after is calculated to be 66.1 kWh / m2. year.
The project has been under way in a long time, because the process of resident involvement and approval has been lengthy and complicated. Residents however finally voted for the renovation and a crucial factor was that there was a modest rent increase. The investment in the passive house renovation amounted to a gross rent increase of 187 DKK / m² per year. But the department's operating budget and residents expect energy savings, the residents could look forward to a rent increase of only 57 DKK / m² per year. year. For an average size of apartment 79 m² corresponds to an increase of about 375 kr. Per. month.
Key figures
Category
Dokumenter
Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| COWI A/S | 0,28 mio. DKK | 0,68 mio. DKK |
| DOMEA Energi & Miljø | 0,13 mio. DKK | 0,24 mio. DKK |
| Bjerg Arkitektur | 0,40 mio. DKK | 0,28 mio. DKK |
| Danmarks Tekniske Universitet (DTU) | 0,21 mio. DKK | 0,04 mio. DKK |
| DFB Dansk funktionærers boligselskab | 1,50 mio. DKK | 4,82 mio. DKK |
Contact
Paralellvej 2
DK-2800 Kgs. Lyngby
www.cowi.dk
Hummelshøj, Reto M. , 45972766, rmh@cowi.dk
Øvr. Partnere: Slagelse Boligselskab; Bernd Kjelland arkitekt; DTU Byg
