Green Lighthouse
- by Ida Bjørn-Mortensen
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- 2015-06-22 09:17:31
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- International
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- 10927 / EN
New Construction
- Building Type : Office building < 28m
- Construction Year : 2009
- Delivery year : 2009
- Address 1 - street : 2200 KøBENHAVN N, Denmark
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 950 m2
- Construction/refurbishment cost : 5 000 000 €
- Cost/m2 : 5263.16 €/m2
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Primary energy need :
3 kWhpe/m2.year
(Calculation method : Other )
Green Lighthouse is Denmark’s first public carbon-neutral building. The building has been built in less than a year in a close public/private partnership.
See more details about this project
http://www.velux.com/sustainable_living/demonstration_buildings/green_lighthousehttp://www.greenlighthouse.ku.dk
Data reliability
3rd part certified
Stakeholders
Designer
Christensen & Co Architects Michael ChristensenContractor
Hellerup Byg -Other consultancy agency
COWI Peter Lawaetz Energy designOthers
Municipality of Copenhagen Anne Skovbro Strategic PartnerOthers
University of Copenhagen Lykke Friis Strategic partner & Building OwnerContracting method
Public Private Partnership
Owner approach of sustainability
The Green Lighthouse is meant to be a lighthouse in more than one sense. It was built as a green lighthouse for CO2-neutral buildings up to the UN Climate Conference in Copenhagen in 2009 (COP15); it as meant as a lighthouse for efficient public-private cooperation; and last, but not least, it stands as a lighthouse for the Faculty of Science at the University of Copenhagen, which will see its student services consolidated under one roof.
Every element in Green Lighthouse was chosen for its energy efficiency and for the well-being of those working in and visiting the building. An open, inviting space that is full of natural light, Green Lighthouse certainly stands out amongst the traditional buildings in the neighbourhood.
Architectural description
A round, sculptural building, Green Lighthouse features high ceilings and an open, spacious floorplan. It is designed in a way that reduces energy consumption by 70 % utilising renewable energy, natural ventilation and light – and with a highly efficient climate envelope. Its circular form ensures the inner atrium is awash in uplifting natural light from the roof’s many roof windows. The central space is also crucial in terms of ventilation as fresh air from the façade windows is channelled through the atrium before it leaves through the room’s roof windows.
The sun is the building’s main energy source, providing passive solar gain, hot water and electricity. Efficient windows minimise the heat loss while maximising passive solar gain. Green Lighthouse’s angled roof plays an active role in the building’s energy profile. It acts as a power plant, capturing the sun’s energy using both solar panels and solar cells.
The façade is made from Swissfiber, a 30 % glass, 70 % polymer composite material that is extremely light and strong. In fact, the entire façade weighs only six tonnes. By comparison, a similar solution in tile would have weighed more than 175 tonnes and been considerably thicker.
A solar clock motive for the shape of the building, the renewable energy sourcing and the integrated art piece
If you had to do it again?
We commissioned the first year into the turnkey contract, this was a good experience. For next projects, it should be commissioned for 3-5 years.
Building users opinion
Very good indoor climate, cf interviews made for "Green Buildings Pay" book written by Brian Edwards & Emanuele Naboni, ed. 3, Routledge
Energy consumption
- 3 kWhpe/m2.year
- 60 kWhpe/m2.year
Envelope performance
- 0 W.m-2.K-1
- 1
- 1 report from COWI consultants
Real final energy consumption
44
2 010
Systems
- Urban network
- Heat pump
- Others
- Solar thermal
- Urban network
- Heat pump
- Solar Thermal
- Solar cooling
- Natural ventilation
- Double flow heat exchanger
- Solar photovoltaic
- Solar Thermal
- Energy recovery from waste
- 90 % district heating in CPH is partly carbon-neutral
Smart Building
GHG emissions
Indoor Air quality
Health & Comfort
Product
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Heat pump and seasonal storage and district heating in combination
heat pump designed for solar cooling, used reverse; taking in hot water from the roof - solar thermal, by use of seasonal storage from summer to winter, and then adding the district heating. http://www.sortech.de/en/
worked well - only few problems with vacuum
Author of the page
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