Date post: | 13-Jun-2015 |
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Introduction
India is a Young country
• July 2011-Population = 1189 million of which
– 0-14 years: 29.7%
– 15-64 years: 64.9%
– 65 years and over: 5.5%
• Dependency ratio of 0.6; 2030-0.4
• 2020 Average Age: India-29; China-37; Japan-48:
India will have youngest working age population in world With this young population India ‘can’ grow fast, provided
the young population is well-educated and well-trained
Continued…..
“Right to Education” successfully implemented by Government of India through “Sarva Sikhsha Abhiyan”
Need to implement “Right to Clean Light”
LED based Solar Urja Lamp (SOUL) is a Solution to “Right to Clean Light”
The power consumption for SOUL whole year is even less than a 1 unit
Design Prospective: Product Design
Light Right Design
Electrical Design
Solar Panel Design
Product Design
LED Housing
LED
Gooseneck
Base of Lamp
1 feet height
SOUL product model
Light Design
The standard lux level for general purpose lighting is 150 lux and that for studying is 250 lux according to the international standards for lighting.
The LED is a 150 lumen per watt
Mode Power
(W)
Lumen ExposedArea under
lamp(m2)
Lux(Lumen/
m2)
Standard Light level (Lux)
1 0.192 28.8 0.185 155 150 (general)2 0.352 52.8 0.185 285 250 (study)
Table for Lux level calculations:
Mode 1: low intensityMode 2 : high intensity
Electrical Design
Battery Electronics Controller
Solar Panel
LED Housing
LED
Goo
sene
ckSun
SOUL basic electrical model
Electrical Design (Cont..)
Operating Voltage Power Consumption (Pmax) Luminance
3.2 V 0.5 Watts 75 lumen
1. LED Technical Specifications:
2. Design Table for calculation of battery capacity
Mode Volt(V)
Current(A)
Power(W)
Energy(Whr)
Efficiency(%)
Energy(Whr)
Battery voltage
(V)
Charge(mAh)
DoD(%)
Capacity(mAh)
1 3.2 0.06 0.192 1.54 85 1.81 2.4 (NiMH)
753 80 941
2 3.2 0.11 0.352 1.76 85 2.07 2.4 (NiMH)
863 80 1078
1 3.2 0.06 0.192 1.54 85 1.81 3.7 (Li Ion)
490 80 611
2 3.2 0.11 0.352 1.76 85 2.07 3.7 (Li Ion)
560 80 700
Electrical Design (Cont..)
3. Design Table for calculation of Solar Panel capacity
• Nearest available capacity of battery is 1200 mAh NiMH
• Peak Power rating of solar module can be 1 approximated to 1 Wp
Mode Energy(Wh)
BatteryEfficiency
(%)
Energy(Wh)
SunshineHours
(H)
Power(W)
Fill Factor
(%)
Peak Power(Wp)
1 1.81 90 2.01 4.5 0.447 70 0.642 2.07 90 2.30 4.5 0.511 70 0.73
Design Table for calculation of Solar Panel capacity
Solar Panel Design
Vmp (STC) V
Temp coefficient mV/ C
Temp differenceC
Voltage drop per cellV
Net Voltageper cell
V0.47 2.3 40 0.092 0.378
Solar cell parameters:Power O/P of Solar Panel : 1 WVoltage : 0.47 VCurrent density : 30 mA/m2
Temp : 25 C. Voltage Coefficient : 2.3 mV/ C
• Battery voltage : 2.4 V• Charging voltage : 2.4 + 1.4 = 3.8 V• No. of Cells = 3.8 V ÷ 0.378 V = 10 numbers
(approx.).
Solar Panel Design (cont…)
No. of Cells = 3.8 V ÷ 0.378 V = 10 numbers (approx).Power Rating /Cell = 1 W ÷ 10 = 0.1 W. Current Rating /Cell = 0.1 W ÷ 0.47 V = 0.212 A = 212 mA. Area of each Cell = 212 mA ÷ 30 mA/sq. cm. = 7 sq. cm. Total area of 10 Cells = 10 x 7 sq. cm. = 70 sq. cm. Packaging density = 50 %Area of panel Panel = 70 sq. cm. ÷ 0.5 = 140 sq. cm
Conclusion:
A powerful component of design for need which looks at the user needs, service needs , distribution issues and most important the empowerment of children .
The design using the best technology for various components and deploying it in system
The proposed solar study lamps will have◦ 0.5 Wp solar panel◦ 0.5 Watt LED◦ 1200 mAH of battery storage◦ Provides light intensity of about 280 Lux (good enough for
study) ◦ 6 to 7 hours of daily service.
Thanks For your attention !