Osramhuset (The Osram Building)

Valhalsgade 4

2200

Copenhagen N, Danimarca

architetto

Tegnestuen T-Plus ApS
Egelykkevej 13, 2720 Vanløse
+45 8853 5000

Owner

Municipality of Copenhagen
Rådhuspladsen 1, 1599 Copenhagen, Denmark
osram@kff.kk.dk
+45 3366 3366

User

Kultur N
Valhalsgade 4, 2200 Copenhagen, Denmark
osram@kff.kk.dk
+45 2911 3089

Contact Details

Jørgen Rose
Danish Building research Institute, Aalborg University
jro@sbi.aau.dk
+45 9940 2226

Other Information

Self-declaration Level: the quantitative data declared in the case study are not attached to any reporting activity linked to a certification scheme. The data are declared on good faith and the declarer certifies it complies with the output of calculation developed for the building.

Visits
Kultur N, Valhalsgade 4, 2200 Copenaghen, Danimarca

Related publications
IEA-SHC Task47
Photo credits: courtesy of Wissenberg
The Osramhuset was originally built in 1953 as an office and warehouse for A/S Dansk Osram. When the building was originally erected it was a breath of fresh air to an otherwise grey, worn down and monotone part of Copenhagen. Today the building acts as a culture and community centre and exploits daylight and natural ventilation to improve the indoor climate.
Energy performance
37 kWh/y

Climate Zone Cfc

Altitude 18 s.l.m.

HDD 3720

CDD 22

Protection level Listed

Conservation Area:
No

Level of Protection:
The facade is worthy of preservation/protected

Building age 1945-1959

Year of last renovation:
2009

Year of previous renovation:
0

Building use Culture and community centre

Secondary use:
NA

Building occupancy:
Discontinuous occupancy (i.e. holiday home)

Building area Net floor area [m²]: 824,0

Building typology:
Detached house

Number of floors:
1

Basement yes/no:
Si

Number of heated floors:
2

Gross floor area [m²]:
872,0

Volume [m³]:
5768,0

NFA calculation method:
Danish Building Regulations

Construction type
Concrete frame

External finish:
Rendered

Internal finish:
Plastered (on substructure)

Roof type:
Pitched roof

+ MORE - LESS
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg
Photo credits: courtesy of Wissenberg

RENOVATION PROCESS

Architecture

BUILDING DESCRIPTION

L'edificio Osram fu originariamente costruito nel 1953 come ufficio e magazzino per A/S Dansk Osram, cioè un produttore di lampadine. L'edificio è stato il primo edificio prefabbricato a Copenaghen, ed è stato costruito in cemento o trucioli, come viene anche chiamato. Il metodo di costruzione è stato sviluppato in Olanda e comprende anche il tremendo potere del calcestruzzo. Gli elementi in questo modo ottengono una struttura molto stretta e uniforme. I singoli elementi in calcestruzzo sono stati stampati presso la fabbrica di cemento di Højgaard e Schultz e consegnati a Valhalsgade dove sono stati assemblati. Il risultato è stato il caratteristico edificio, che ha ottenuto riconoscimenti da architetti e ingegneri per l'architettura rivoluzionaria e che oggi è considerato degno di conservazione.
Urban context
When the building was originally erected it was a breath of fresh air to an otherwise grey, worn down and monotone part of Copenhagen. Today the building acts as a culture and community centre in the district of Nørrebro…

HERITAGE SIGNIFICANCE

ELEMENTS WORTHY OF PRESERVATION
The facade facing the street.
Heritage Value Assesment
No specific heritage value assessment was performed. The facade of the building was protected, but the remaining parts of the building could be altered etc. as long as it did not affect the facade.

State of repair

Conditions of the envelope
The building had undergone regular maintenance since the beginning, but no major renovations had been performed. The warehouse part of the building was torn down several years ago.

Aim of retrofit

Renovation
"The challenge was to energy renovate a former industrial building, now in use as culture centre, among other things by utilizing daylight and natural ventilation to improve the indoor climate. In connection with the Climate Change Conference, the City of Copenhagen initiated a strategic cooperation with a number of Danish enterprises for the purpose of mutual profiling on climate-friendly buildings. The target was to minimize the resources required (and, consequently, the CO2 emission) both during construction and upkeep. The renovation of the OSRAM Culture Centre was a part of this cooperation and acted as a spearhead for possibilities and methods of renovating old industrial and commercial buildings worth preserving. The overarching aim was also to reduce energy consumption by improvement of the thermal envelope, improving ventilation and utilizing energy saving lighting.
Stakeholders Involvement
Public sector
Municipality of Copenhagen (owner)
Rådhuspladsen 1, 1599 Copenhagen, Denmark
osram@kff.kk.dk
Tel.+45 3366 3366
Architect
Tegnestuen T-Plus ApS
Egelykkevej 13, 2720 Vanløse
Tel.+45 8853 5000
Energy Consultant
Wissenberg A/S
Hejrevej 26, 4. sal, 2400 København NV
info@wissenberg.dk
Tel.+45 3386 3486
Structural Engineer
Wissenberg A/S
Hejrevej 26, 4. sal, 2400 København NV
info@wissenberg.dk
Tel.+45 3386 3486
Services Engineer
Wissenberg A/S
Hejrevej 26, 4. sal, 2400 København NV
info@wissenberg.dk
Tel.+45 3386 3486
Electrical consultant
PME Elrådgivning A/S
Energivej 3, 4180 Sorø
pme@pme.dk
Tel.+45 7021 1122
"Danfoss A/S, Louis Poulsen Lighting A/S, Osram A/S, Pilkington Denmark A/S, Rockwool A/S, VELFAC A/S & WindowMaster A/S "
Building industry - active participation in project
Several - see comments
Tools used
Was the renovation process done following a specific methodology? No
Energy calculation Be15

RETROFIT SOLUTIONS

External Walls

Wall type 1

Wall type 2

Wall type 1

The facade of the building could not be touched and therefore this part of the building was insulated on the inside, i.e. by adding a layer of glass from floor to ceiling on the inside of the construction. Below the windows 50 mm insulation was added as well.

Reversibility was not considered. The important thing here is that the facade of the building has maintained its appearance from the outside and adding a layer of glass on the inside along with a layer of insulation below the windows has reduced heat loss significantly.

U-value (pre-intervention) [W/m2K]: 2,24 W/m²K U-value (post-intervention) [W/m2K]: 0,13 W/m²K
More Details
Original wall build-up
Concrete - Concrete:
60 mm
Air gap :
60 mm
Concrete :
120 mm
Retrofitted wall build-up
Concrete :
60mm
Air gap - Ventilated air gap:
60 mm
Concrete :
120 mm
Insulation - Insulation:
85 mm
Plaster - 2 layers of gypsum 13 mm:
26 mm
Wall type 2

The back of the building and the wall facing the gate had no restrictions and thus an external layer of insulation was added.

The cladding panels have been engraved with a pattern that evokes the original concrete windows.

U-value (pre-intervention) [W/m2K]: 3,73 W/m²K U-value (post-intervention) [W/m2K]: 0,09 W/m²K
More Details
Original wall build-up
Concrete - NA:
240 mm
Plaster :
20 mm
Retrofitted wall build-up
Cladding - Steel - patterned:
10mm
Insulation - Mineral wool:
380 mm
Concrete :
240 mm
Plaster :
20 mm


Windows

Window 1

Window 2

Window 3

Window 1

Since the facade could not be altered, a layer of glass was added to the inside (floor to ceiling).

Existing window U-value Glass [W/m2K]: 5,9 New window U-value Glass[W/m2K]: 1,2 Existing window U-value Frame [W/m2K]: 1,2 New window U-value Frame [W/m2K]: 5,9
More Details
Existing window type Fixed window
Existing glazing type Single
Existing shading type Fixed shading
Approximate installation year 1953
New window type Fixed window
New glazing type Single
New shading type Fixed shading
New window solar factor g [-] 0,5
Window 2

Windows not part of the facade towards the street were replaced

Existing window U-value Glass [W/m2K]: 2,7 New window U-value Glass[W/m2K]: 1,2 Existing window U-value Frame [W/m2K]: 1,2 New window U-value Frame [W/m2K]: 2,7
More Details
Existing window type Double window
Existing glazing type Double
Existing shading type NA
Approximate installation year 1990
New window type Double window
New glazing type typology
New shading type NA
New window solar factor g [-] 0,5
Window 3

No roof windows were there before the intervention. 16 Velux GGU F08 660 x 1400 mm and 12 Velux GGU F06 660 x 1180 mm were added in order to improve the daylighting levels in the building.

New roof windows were established. The only limitations were on the front facade.

Existing window U-value Glass [W/m2K]: 0,0 New window U-value Glass[W/m2K]: 1,8 Existing window U-value Frame [W/m2K]: 1,8 New window U-value Frame [W/m2K]: 0,0
More Details
Existing window type None
Existing glazing type None
Existing shading type NA
Approximate installation year 2000
New window type Double window
New glazing type Double
New shading type NA
New window solar factor g [-] 0,46

Other interventions

MEASURES TO INCREASE AIRTIGHTNESS

MEASURES TO INCREASE AIRTIGHTNESS

The airtightness was improved significantly due to the insulation of the facade (inside and outside), the new windows and the floor to ceiling glass on the inside of the exterior wall (ground floor of facade). No other measures were carried out to specifically improve airtightness.

HVAC

HEATING

VENTILATION

DOMESTIC HOT WATER

HEATING

"The original heating system was based on district heating using steam supply. The heat distribution system was a single pipe system. The new heating system is based on district heating using hot water supply. The heat distribution system is a two pipe system and thermostat valves have been added to the radiators."

The changes in the heating system would not influence other parts of the building.

More Details
New primary heating system
New system type Heat exchanger
Fuel District heating (water)
Distribuition system Radiators
Nominal power NA kW
VENTILATION

The original ventilation system was a simple mechanical exhaust system where air was removed from toilets and kitchens. In the renovated building mechanical ventilation with heat recovery was installed and this was supplemented by natural ventilation via the roof windows. The natural ventilation is controlled by electric motors based on the indoor climate.

In this case the solution was easily compatible, since only the facade of the building was to be preserved, i.e. no ristrictions regarding the internal parts of the building. This meant that the new ventilation ducts could be placed where most appropriate.

More Details
Original roof build-up New ventilation system
Type ventilation system Combined - natural + mechanical w. heat recovery
Type flow regime Combined
Heat recovery Si
Humitidy recovery No
Nominal power NA kW
Electric power 0,0 kW
Control system NA
DOMESTIC HOT WATER

Hot water is produced by district heating/heat exchanger and therefore changes as described above. In addition solar heating was added to the building to supplement the district heating using hot water supply.

The solar panels are placed on the roof. The solution is compatible since only the facade of the building was being preserved.

More Details
New DHW system
Type with heating system
Hot_water_tank Si
With heat recovery No

RENEWABLE ENERGY SYSTEMS

SolarThermal

SolarThermal

Velux Solar collectors were installed on the roof. 2 panels of 1.34 m x 1.80 m resulting in a total area of 4.82 m2.

The solution is compatible since there were no restrictions on the roof construction.

The solar panels are mounted on the sloping roof facing south-east.

More Details
SolarThermal System
Type Flat collector
Collector area 4,82 m²
Elevation angle 22,0
Azimuth 135,0
Overall yearly production 10,0 kWh
Heating_contribuition 0,0 kWh
DHW contribuition 10,0 kWh
Cooling contribuition 0,0 kWh

Energy Efficiency

Energy Performance
Energy performance certificate: Energy performance certification is obligatory. An energy specialist performs a thorough analysis of the building and comes up with possible energy saving measures.
Voluntary certificates: No
Energy Use
Documents:
SBi_AAU_OsramBuilding_RelatedPublication_001(1)_1.pdf
Consumption_estimation_Before: 158 kWh/m2.y
Consumption_estimation_After: 37 kWh/y

Primary Energy
Consumption_estimation_Calculation_method: NA
Consumption_estimation_Before: Si kWh/m2.y

Internal Climate

Temperature

The indoor climate of the building was improved significantly by the renovation process. The insulation of the building envelope along with the installation of new windows increased the thermal comfort in the building. Another important aspect of the building renovation is the improved lay-out of the building and the flexibility with which the building can now be used. The improved indoor climate has also helped to make the entire building area useable.

Indoor Air Quality

The increase in air tightness and the removal of cold surfaces (windows and walls) have helped to remove draught and general discomfort in the building. The indoor air quality has also improved significantly by the introduction of a combined mechanical and natural ventilation system. The mechanical system has heat recovery and will ventilate the building during winter. When indoor temperatures or CO2-levels in the building get too high, the automatic natural ventilation will be initiated (opening of roof windows).

Daylight

Daylighting levels in the building were raised by introducing roof windows, that would both help raise daylight levels on the first floor and on the ground floor (see pictures). The lighting systems in the building have also been improved. The general lighting system has been fitted with automatic control, so that the electric lighting is dependent on daylight levels in the building (there is a manual override to this function). Also, decorative LED lighting has been added to the window sills in the original façade windows of the building, making it possible to set the scene for any arrangement in the building.

Costs

Financial Aspects

The total renovation costs (investment total), the part of the investment actually related to energy savings (investment energy), the energy savings per year (savings), the simple payback time (payback time) and the expected CO2-emission reductions (CO2-reduction) is given in the table. The total investment for the renovation project was approximately 564,000 € of which 212,000 € were directly aimed at energy reductions. The expected total savings per year was 13,000 €, i.e. resulting in a simple payback time for the entire project of approximately 18 years. This should result in CO2-reductions of approximately 29 tons per year.

Investment Costs
Total investment costs
563988 (total)
Amount includes: Everything

Cost of energy related interventions:
212000 (total)
Amount includes: Everything
Running Costs
Total annual energy cost
13615 (total)

Annual electricity cost
9301 (total)

Lifecycle documents:
SBi_AAU_OsramBuilding_RelatedPublication_4.pdf
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