Question about light shelf
When should we put the light shelf indoor? And when should we put the light shelf outdoor? I try to search the answer, but google said it depends on the climate. While in this question, it doesn't mention the climate.
This is a demo exam question from NCARB. I rotate the louver 90 and use it as blinds for glare control. I put the light shelf outdoor.
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Hi Kara,
Heating, Cooling and Lighting has a section explaining light shelves and other useful window strategies. I would highly recommend that book for PPD exam. You can find a lot of useful information there and NCARB recommends it for PPD as well. It is definitely much safer than Google search.
Light shelves work the best on south windows. But on north windows they do more harm than they do good because they block more daylight than they collect. On east and west windows you need deeper light shelves compared to the south.
When mounted outside above eye level they are good for preventing glare. The additional light shelve inside redirects the radiation deeper in room. It also prevents glare from the upper part of the window. Typically having just indoor light shelve don’t do much. So it is recommended to do both outdoor and indoor to get the most advantage of solar radiation without glare issues. But like I said, I would do a comprehensive study of sustainable building design topics from HCL or MEEB to get a deeper understanding of ARE-content.
Best of luck! -
I am always hesitant to recommend Wikapedia, but this ite helped me understand a bit better. https://en.wikipedia.org/wiki/Architectural_light_shelf
I think the key here is that the question specifically says that the architeect needs to provide glare contorl along with maximizing light. The outside louvers need to be used for the glare control, and the interior one to bounce the lights further into the room.
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The louvres angled //// will block the sunlight. The louvres angled \\\\ that way won't.
The question asks you to provide 'indirect lighting' to the space, which is your clue that you need to add the interior light shelf. The interior part of the light shelf bounces the light to the ceiling to indirectly light the space. It brings in more light and it's not glaring direct sunlight on your work surface.
As mentioned by others Sun, Wind & Light has a section on this topic with diagrams.
Hope this helps!
Rebekka
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