LE07 – Heather COOPER A2012 Sévenans Marvell Ikounga Thomas Neukirchner Sylvain Menguy LE07 – Heather COOPER A2012 Sévenans Marvell Ikounga Thomas Neukirchner Sylvain Menguy Lighting devices for emerging countries 1

About the Project … Lighting devices Dedicated for people in the developing world Meet many criteria : – Being affordable (not expensive or high return on investment) – Easy to use and install, strong and durable – Made from commonly materials 2

Plan 1.Devices presentation 1.The solar mosquito-killer lamp 2.The Cool Earth Solar system 3.The solar bottle bulb 2.Comparisons 3.Choice of one device 3

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6 Sunlight strikes the lamp solar cells N-type silicon has free electrons, the same released previously. P-Types silicon has free holes. When N-type and P-Type silicon come into contact, an electric field forms within the cell Photons alter the trajectory of the electrons, and thus release them

7 During daylight, the solar panels produce enough power to charge the battery During the night, the electricity stored make the lamp light on Circuit using a Photo resistor to switch on the light automatically

8 High-voltage electric grid (harmless for children) Eliminates mosquitos safely and effectively in a non-toxic and non-chemical way

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11 -Generates 300 to 400 times the electricity of a classic cell -Only one cell -Need a cooling system (water-cooling system)

12 -5 Watt DEL lamp = 60 Watt incandescent bulb -Lifespan : more than hours -CES system could provide Watts, it could supply DEL lamps at the same time

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14 Provide light to houses which are windowless Give light to that homes which are not economically capable to buy electricity Light up dark areas in your home during daytime After installation on the roof, the water will reflect the light in every direction instead of spotting it only at one point (diffused light)

15 Sunlight is refracted by the water Water refracts the light from above to below into the darkness The light spreads out around the room Principle of refraction (the light, when entering into water, changes direction and spreads light in every direction).

16 -It diffuses light in every direction (more powerful than some electric bulbs) -Lifespan of five years -Very useful by sunny weather / in sunny countries -Very cheap -Easy to assemble

Comparisons 17 Price – Return on Investisment -CES system : -balloon (1 ) -1 DEL lamp : 5 -Global system (cell, coolling system and structure) : 30 -Solar lamp : 15 -Bottle bulb : 1

Comparisons 18 Efficiency -Solar lamp : 10 m² = 3-4 meters around -Bottle bulb : equivalent to a 60W bulb -CES system : can supply 40 to 60 DEL Lamps at the same time

Comparisons 19 Ergonomic aspects -CES system : light and aerodynamic but big size -Bottle bulb : quite small but static -Solar lamp : portable with a handle. Can be a static and a moving lighting device and can lights during the night (battery). Kills mosquitoes.

Comparisons 20 Maintenance -CES system : Change the balloon every year -Solar lamp : no maintenance, just needs to be cleaned and to change batteries -Bottle bulb : Change every 5 years

Comparisons 21 Production -CES system : cant be built in emerging country -Solar lamp : cant be built in emerging country -Bottle bulb : Easy to build everywhere with simple plastic bottle and metal (20 minutes)

Choice 22 The solar bottle bulb

Sources 23 Solar bottle bulb : BBC video : Informations : Cool Earth Solar system : Their website : An article : Solar mosquito-killer lamp :

LE07 – Heather COOPER A2012 Sévenans Marvell Ikounga Thomas Neukirchner Sylvain Menguy LE07 – Heather COOPER A2012 Sévenans Marvell Ikounga Thomas Neukirchner Sylvain Menguy Thank you 24