In front of the VELUX head office in Denmark stands the demo house SOLTAG. In it are installed various types of VELUX roof windows. On the model you can see the current performance of each roof window. The immediate energy performance is calculated as being current incident solar energy minus the heat loss through the window. If the energy performance is greater than zero, the window is adding energy to the building.
The intention of this model is to illustrate the windows' energy balance at this specific moment and thus illustrate how the sun contributes to the energy performance of the building. This contribution is considerable, even on an overcast day, making the window an actual heat source.
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About SOLTAG
SOLTAG is an energy optimised home that lives, breathes and produces quality of life for people.
Explore the house
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Visit SOLTAG
SOLTAG is part a research project, which is funded under the EU’s "Sixth Framework Programme".
Go to Hørsholm, Denmark
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Additional material
A more detailed description of the project SOLTAG can be downloaded as a PDF file.
Download pdf
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Behind the calculations
The "Energy balance" tool is based on live data, predicted conditions and a complex formula.
Read more
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