DAYLIGHTING ISSUES - NTNU
Transcript of DAYLIGHTING ISSUES - NTNU
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DAYLIGHTING ISSUES Barbara Matusiak
Department of Architectural Design, Form and Colour Studies
Three Spheres, by Maurits. C. Escher (lithograph, 1946)
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Daylighting in the bank building?
10 30 5747
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Daylight level in officies
15º
?
? Step 1:Calculation of daylight level for alternatives:-BaseCase: 50-50-50-50-BaseCase: 70-50-30-20-ALT: 70-50-30-20 + mirror-ALT: 70-50-30-20 + reflector-ALT: 70-50-30-20 refl. + mirror
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Glass• Windows:
LTglass = 0,71
• Roof in light spaces: LTglass = 0,70, LTroof = 0,70 * 0,9 = 0,63
• Outside glazed walls in light spaces:LTglass = 0,71, LTwall = 0,71 * 0,9 = 0,64
• Glas walls in office areas toward light spaces:LTglass = 0,9, LTwall = 0,9 * 0,95 = 0,85
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Relux/Radiance model
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BaseCase: 50-50-50-50
2. etg.
3. etg.
4. etg.
5. etg.
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BaseCase: 70-50-30-20
2. etg. 4. etg.
3. etg. 5. etg.
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ALT: 70-50-30-20 +mirror
2. etg.
3. etg.
4. etg.
5. etg.
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ALT: 70-50-30-20 +reflector
2. etg.
3. etg.
4. etg.
5. etg.
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BEST: 70-50-30-20 refl.+mirror
2. etg.
3. etg.
4. etg.
5. etg.
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2. ETG.
70-50-30-20
50-50-50-50 70-50-30-20 refl
70-50-30-20 refl+mirror
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Overcast sky
The illuminance (lux) at a hor. plane 80 cm over the floor. Overcast sky. 28 mars. at 12:00. The illuminance at a hor. non obstructed plane outside is 10.000 lux.
Step 2:Calculation of daylight level at 2. floor after the architects drawing to find out the area suitable for permanent working places
DF=1%border
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Clear sky
Clear sky. 28 mars. at 11:00.
Step 3:Calculation of daylight level at 2. floor after the architects drawing, sunshading
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Solar Diagram
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Solar shading?
20º
47º
Low windows: outside solar shadingHigh windows: permanent supplyof daylight.
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Facades toward light spacesStep 4:Calculation of daylight level at 2-5 floors to find out the optimal design of facades toward light spaces: combination of opaque parts, clear glass and sun awning glass.
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Daylighting at the attic storey
in the old bank building
Step 5:Calculation of daylight level at the attic storey. Enclosure?
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Conclusions• Very high degree of transparency:
– good visual contact with both streets (light spaces and low sitting windows)
– and with other parts of the building (through light spaces)• Very easy to orientate oneself in a large and complex
building• Comfortable daylighting
– Outside solar shading in windows– Constant supply of daylight through the highly sitting window
stripes, also when sunshine, it may contribute to the visual environment of high quality: with variation but without glare
– Possibility for development of green oasis's in light spaces, high amenity value
– Enough daylight level DF at permanent working places
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Maurits Cornelis Escher
two interlocking bands wrapped around the frame of a cube