Gullhaug Torg 5, Oslo (GT5)
Project: Gullhaug Torg 5, Oslo, Norway.
Customer: Avantor AS
Contractor: Betonmast Oslo
Status: Completed
Time period: August 2020 – Spring 2022
Products: A total of 4 000 sqm of ConverLight® Dynamic 4-glass + EcoPlus and ConverLight® Static 4-glass + EcoPlus
Background to the project GT5
The project included installation of windows in an environmentally certified property in Oslo, Norway. The project was partly financed by the Norwegian innovation agency Enova under the program “New technic in the construction industry”. Enova reports to the climate and environment ministry in Norway and the project GT5 has got its grant for an innovative facade solution with both dynamic and static glass. The building is now fully built which means the project is completed.
– Our goal has been to create an energy efficient facade that uses the project’s architecture with focus on indoor climate and environment. The solutions from ChromoGenics were crucial for the purpose of the project, says Kjetil Hafredal, Project Manager at Betonmast Oslo.
Innovative solution for glass facade
A challenge with the building was that the entire facade would consist of large glass surfaces. The idea with the glass facade was that it would generate a reduced energy use in the building and contribute to the property achieving a Breeam certification. Right from the start of the project, the environmental aspect was one of the most important factors. This meant that ChromoGenics, together with the other actors in the project, had to come up with an innovative facade solution for the property.
– The client requested a transparent glass building. Therefore, we had to think differently and jointly developed an innovative facade solution which we received support from Enova to implement, says Kjetil Hafredal, Project Manager at Betonmast Oslo to Byggeindustrin.
In addition to building-integrated solar cells, the new concept that was developed also included the use of both static and dynamic glass. There were two unique technologies used in the glass facade – a foil that replaces intermediate glass in multi-glazed constructions and an electrochromic dynamic sun protection laminated in the outermost glass.
The concept has turned out to be very successful and has contributed to reducing energy use in the building by almost 50%. The dynamic glass in the facade regulates both temperature and light, which creates a very good indoor environment. For the tenant Crayon, which has its global headquarters in the building, this means a pleasant working climate in a sustainable and innovative building. Several of the actors involved in the project believe that this new, unique concept for glass facades can be used in several projects in the future.
– We had to find a new concept with the glass facade, which is an important part of the whole project. Simply explained, the solution consists of a facade with the combination of Heat Mirror foil and ConverLight dynamic electrochromic sun protection. The foil replaces intermediate glass in multi-glazed constructions and an electrochromic dynamic sun protection is laminated in the outermost glass, says Hafredal to Byggeindustrin.
The glass facade has contributed to several positive environmental impacts, such as:
- Certification for BREEAM NOR Excellent
- Energy Class Green A
- 50% reduced energy use in comparison to similar properties
- 50% reused och reusable materials
- Maximum of 25 kg waste/m² during the construction period
GT5 nominated for two awards!
The unique glass facade developed by ChromoGenics and other contributors for GT5 has been nominated for two awards.
One nomination is for the Construction Industry Climate Award in Norway, where the nominees are expected to initiate innovation and contribute to the development of practical tools and solutions to reduce the construction industry’s carbon footprint. The glass facade for Gullhaug Torg 5 is one of four candidates for the award, with the winner receiving 250,000 Norwegian kroner. The motivation for the nomination of the GT5 glass facade is as follows:
One of the nominees for the Construction Industry Climate Award is the environmentally friendly glass facade for Gullhaug Torg 5, developed by Betonmast Oslo, Avantor, Multiconsult, Arcasa, and ChromoGenics. At Gullhaug Torg 5 in Oslo, a glass facade has been used with significantly reduced energy consumption, combined with a low CO2 footprint and reduced use of raw materials.
The second nomination is for Building of the Year in Norway 2022, where several thousand projects are carried out each year across the country. The selection jury reviews several hundred projects and determines which candidates have been nominated for the awards. ChromoGenics is one of the five nominated candidates.
Read more about the nomination for the Construction Industry Climate Award.
Read more about the nomination for Building of the Year.
Why use ConverLight® from ChromoGenics?
By using ConverLight® from ChromoGenics, the glass has no limitations which gives more architectural freedom. The electrochromic technology in our dynamic solar control glass stops the solar heat even before it enters the building. ConverLight® Dynamic blocks up to 90% of the heat and isolates as good as a wall, by still providing daylight and a good view. ConverLight® acts as an automatic climate system where unwanted solar heat radiation decreases, which keeps the premises cool, and the use of external solar control can be avoided. As a result, ConverLight® is very cost effective for all buildings.
What does ConverLight® EcoPlus mean?
The glasses from ChromoGenics that are being used in the project GT5 are ConverLight® Dynamic 4-glass + EcoPlus and ConverLight® Static 4-glass + EcoPlus. What does EcoPlus mean? In Eco we use a PET-film (Heat Mirror) as middle glass instead of glass. The PET-film has a lower weight and less glass which gives lighter transportations that is better for the environment. Plus is a coating that improves the performance of the glass and decreases the condensation, which gives improved g-value and better view during damp days.
GT5 is a environmentally certified building
The office building has six floors and a basement, with a total area of 14 000 square meters in Nydalen, Oslo. The property has a high environmental focus and is certified as BREEAM NOR Excellent. Both the dynamic functions and the Eco-version in the glasses from ChromoGenics contribute to a decrease of greenhouse gas emissions by 50%. The yearly savings are calculated to land around 100 000 kWh.