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Physical Model- Daylight Testing

AT2 Lighting Study

My main aim is to test a number of different roof

Aims:

1) To compare physical modelling to computer modelling techniques

types to see what the daylight quality inside the space is. Roof Type 1 -Cone

Roof Type 2 -Octogan

Roof Type 3 -Scoop

2) To use lighting data and findings to inform, alter and improve my design 3) Understand particular lighting requirements for different environments

Introduction:

My main space is particularly relevant to the lighting study, as it serves as a social / entrance space in the day time, and as a theatre/ performance space at night. Therefore in the daytime I need to get sufficient light levels for reading tasks (500 lux minimum), and also provide an element of drama and excitement as it is the main access space to my library. Also I need it to be suitably able to provide lighting for small scale performances, so the digital testing of artificial lighting will be good for this purpose.

Cone Roof Daylight Factors

Octogon Roof Daylight Factors X 4.4%

X 2.6%

X 2.8% X 5.7%

X 3.3%

X 5.4%

X 0.9%

X 2.4%

X 1.6%

X 0.3%

Ground floor

First floor

Ground floor

X 10.3%

X 6.3%

X 2.1% X 10.9%

X 18.4%

X 8.0%

X 1.8%

X 15.9%

X 14.6% X 12.7%

X 6.6% X 12.0%

X 9.8%

X 8.0%

X 9.8% X 7.9%

X 2.6% X 8.2%

X 5.8%

1200 lux (18% DLF) 1000 lux (15% DLF)

800 lux (12% DLF) 600 lux (9% DLF) 400 lux (6% DLF) 200 lux (3% DLF)

7m

11m

15m

19m

X 2.9%

X 8.8%

Ground floor

1400 lux (20% DLF)

X 1.6%

X 2.8% X 16.2%

X 9.0%

3m

X 0.5%

X 1.6%

X 2.8%

1m

X 1.2%

X 1.9%

X 4.6%

X 1.8%

X 10.9%

I found the scoop roof didn’t provide enough light in down to the ground floor, however it was interesting that it did provide a gradient of light across the space, something that I may consider elsewhere. The octagonal roof worked well in summer, with the light reflector bouncing light into the different floors. I however found it undesirable in winter the amount of light penetration you got into those floors. The cone shaped roof provided great phenomena in that a circle of light traced its way around the cone throughout the day, and washed down the north face. Also on the two floors, you got a crescent of direct sun light that draws you towards the space.

X 0.2%

X 1.9% X 6.4%

X 4.4% X 3.8%

Physical Modelling Conclusion:

X 1.0%

X 1.9%

X 5.7%

X 1.4%

X 3.1%

Note: Conclusion had been made with the addition of the results of the sunlight penetration testing on the following page.

Light Scoop Roof Daylight Factors

X 5.9%

Ground floor

Ground floor

1400 lux (20% DLF)

1400 lux (20% DLF)

1200 lux (18% DLF)

1200 lux (18% DLF)

1000 lux (15% DLF)

1000 lux (15% DLF)

800 lux (12% DLF)

800 lux (12% DLF)

600 lux (9% DLF)

600 lux (9% DLF)

400 lux (6% DLF)

400 lux (6% DLF)

200 lux (3% DLF)

200 lux (3% DLF)

1m

3m

7m

11m

15m

19m

1m

3m

7m

11m

15m

19m


Sunlight Penetration testing Digital Model

Physical Model

9:00 am, June 21st 9:00 am, June 21st

12:00 pm, June 21st

12:00 pm, March 21st

12:00 pm, Dec 21st

12:00 pm, March 21st

4:00 pm, March 21st

4:00 pm, March 21st

9:00 am, Dec 21st 9:00 am, Dec 21st

4:00 pm, June 21st

4:00 pm, June 21st

9:00 am, March 21st

9:00 am, March 21st

12:00 pm, June 21st

4:00 pm, Dec 21st

12:00 pm, Dec 21st

4:00 pm, Dec 21st


Digital Model

Light Meter Analysis

My main goal for the digital testing is to compare the two modes of the space, in the open day-lit scenario, and the closed, artificially lit performance scenario. By now my design has changed in shape from my original physical model, but the lighting system remains the same and can still be compared. I want to set up a performance space, therefore used spotlights, with wall washer lights that would be turned off during performances.

Comparison Conclusion

This data is very useful, as it shows me accurately the gradient of light levels achieved using the cone shaped roof that I liked from my physical testing. The promising this is that the levels were very similar to my physical model.

Artificial Lighting Testing

Main Performance space- Artificial Lighting

Spotlights used

76655.000 Emanon Spotlight LED 14W 870 lm 3200K Housing colour Silver warm white, wide flood

Wall Washer Used

75768.000 Cantax Spotlight LED 14W 1080 lm 5500K Housing colour Black daylight white, spot

Main Performance space- Natural Lighting

Lighting Analysis  

Technology wsa 2

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