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garfunkel4 Jun 2016 21:56Let's assume we have a room with an area of 20m² (215 sq ft). Now, planning a window with 2m² (22 sq ft) of glass surface for this room.
How bright would that be?
What about if the room had 10m² (108 sq ft) of glass surface?
At what glass surface area in m² would the room no longer get significantly brighter?
And so on.
Is there a rule of thumb to figure this out, or maybe even a calculator or a simple formula to determine it?
Perhaps one that also takes external factors into account, such as a nearby tree, a carport, a neighboring house, an overhead balcony, or the window’s orientation to the north/east/south/west?
How bright would that be?
What about if the room had 10m² (108 sq ft) of glass surface?
At what glass surface area in m² would the room no longer get significantly brighter?
And so on.
Is there a rule of thumb to figure this out, or maybe even a calculator or a simple formula to determine it?
Perhaps one that also takes external factors into account, such as a nearby tree, a carport, a neighboring house, an overhead balcony, or the window’s orientation to the north/east/south/west?
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Traumfaenger4 Jun 2016 22:12In my opinion, that depends on many factors, such as the orientation and sunlight.
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garfunkel4 Jun 2016 22:14Hello, yes, that’s true. But you still need a way to predict whether enough windows will be installed to achieve brightness level x or how it will be with the planned design.
The regional building code states that in Baden-Württemberg, the window area must be about 1/10 of the floor area.
The transmission value (TL value) then tells you how much light passes through the glass.
Now, theoretically, you could plan for 20m² (215 sq ft) of window area with a TL of 70% light transmission.
However, you rarely need that much, or do you not want to place any furniture?
The transmission value (TL value) then tells you how much light passes through the glass.
Now, theoretically, you could plan for 20m² (215 sq ft) of window area with a TL of 70% light transmission.
However, you rarely need that much, or do you not want to place any furniture?
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garfunkel4 Jun 2016 22:29Hello Tom, the room example was just a thought experiment on my part 😉
What is the TL value, and how is the 70% calculated?
How much lighting is needed for a bright room?
And what is generally defined as bright?
I once read that an office space requires 500 lux (regardless of natural or artificial light) and a workstation with small electronic components needs 800 or 1000 lux.
Based on this, without being able to assess it exactly, I would say that 1000 lux can be considered bright.
What is the TL value, and how is the 70% calculated?
How much lighting is needed for a bright room?
And what is generally defined as bright?
I once read that an office space requires 500 lux (regardless of natural or artificial light) and a workstation with small electronic components needs 800 or 1000 lux.
Based on this, without being able to assess it exactly, I would say that 1000 lux can be considered bright.
The TL value indicates how much sunlight passes through, and this information is provided with your windows.
I can’t answer your question specifically, but too much window area without shading in summer will cause the house to overheat significantly. So, blinds or shutters are essential.
I can’t answer your question specifically, but too much window area without shading in summer will cause the house to overheat significantly. So, blinds or shutters are essential.
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