The Use Of Natural Light Indoors

Diogo FerreiraBar EshkolShani Beracha

Introduction- The situation Nowadays

•Use of artificial light

•Ending resource Lighting 9%

Pic.1-electricity usage in North America

The Use Natural Light Indoors

•Less use of electricity

•It’s free!

•Ecological

•Healthier

Our solution

•Three parts:

• Light shelf

• Solatube

•Optical fibers

Light Shelf

•Reflects sunlight

•Prevents blinding

Pic.2- using light shelf

Winter sun

Summer sun

Pic.3- winter sun & summer sun

Light Shelf•The shelf’s properties should match the room properties.

•Works only in the southern rooms

Pic.4- light shelf examples

Pic.5- light shelf

Solatube

•Parabolic glass

•Prism

•Tube with mirrors

Structure:

Pic.6-solatube

Solatube•Suitable for every sun

position.

•Easy to apply.

•1 tube= 33 m²

•Only for the top floor

•Big rooms = more tubes Pic.6-solatube

Pic.7-solatube example

Optical fibersOptical fiber Parabol

ic mirror

Water lamp

Pic.8-optical fibers system

Pic.9-parabolic mirror positions

Optical fibersAdvantages•Works for every room

•Optical fibers are small

•Long lifetime

Disadvantages•Price

•Moving the parabolic mirror

Conclusion

•One-time expense.

•Pays off after 1-2 years.

•Reduces the electricity

usage.

•Creates a well lit house.

Thank you for your prompt attention!

Have a sunny day!

Window Width

Room Depth

Solar altitude

Shelf Thickness

6 ft/1.83 m

8 ft/2.44 m

20 deg

5”/13 cm

5 ft/1.52 m

10 ft/3.05 m

35 deg

4”/10 cm

4 ft/1,22 m

12 ft/3.66 m

50 deg

3”/8 cm

3 ft/91 cm

14 ft/4.27 m

65 deg

2”/5 cm

2 ft/61 cm

16 ft/4.88 m

80 deg

1”/3 cm

Light Shelf Instances

PricesArtificial light6 lamps (0.013 kW) X 12 hours a day X 0.6 shekels per kW= 0.5616 shekels

For a year:204.984 shekels

Optical fiber3 optical fibers (4 m each) X 15 shekels per meter= 180 shekels

Total: 180 shekels plus the price of the mirror