In this presentation an effort has been made to understand the potential of electricity saving in buildings by replacing traditional ligthbulbs by LEDs lightbulbs.
2. CONTENTS
Objectives
Lighting electricity consumption in buildings
Electrical consumption before retrofitting- A
case study of dormitory section in IMOP building
LEDs light bulb
After retrofitting
Results
Conclusions
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3. OBJECTIVES
To highlight current lighting electricity
consumption in buildings
To decrease electricity consumption in buildings
To estimate the required investment
To calculate the Payback period
To calculate monthly electricity saving using
LEDs light bulbs
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4. LIGHTING IN BUILDINGS – ELECTRICAL
CONSUMPTION
Lighting represents almost 20% of global
electricity consumption
This consumption is similar to the amount of
electricity generated by nuclear power
The latest IEA estimates show the total savings
potential in residential and services lighting at
more than 2.4 EJ per year by 2030
Source: International Energy Agency 4
5. CURRENT SCENARIO –
DORMITORY SECTION, IMOP BUILDING
Apartment
Number of
lamps
Watt Total Wattage
Bedroom 1 4 60 240
Bedroom 2 4 60 240
Kitchen 2 50 100
Toilet 1 50 50
Shower 2 50 100
Total current power requirement of an apartment 730 W
Assumptions
Bedrooms: 8h/day
Kitchen: 16h/day
Toilet & bathroom: 4 h/day
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6. Current electricity consumption and monthly &
annual bill of an apartment
Electricity consumption per day: 6.04 KWh
Total consumption per month: 181.2 KWh
Monthly electricity bill: 543.6 rubles (1 KWh = 3
ruble)
Annual electricity bill: 6523.2 rubles
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7. LEDS LIGHTS
Three of the most common energy-efficient
lighting types include halogen incandescents,
CFLs, and LEDs
Traditional incandescent bulbs use a lot of energy to produce light
90% of the energy is given off as heat
That lost energy is money we are throwing away
LEDs use only 20%–25% of the energy and last up to 25 times
longer than the traditional incandescent bulbs they replace
LEDs use 25%–30% of the energy and last 8 to 25 times
longer than halogen incandescent
The LED lamps have very high efficiency
It acts as an environmental light source from manufacturing to
disposal
Source: www.mrs.680 org,
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9. AFTER RETROFITTING
Apartment
Number of
lamps
Watt Total Wattage
Bedroom 1 4 10 40
Bedroom 2 4 10 40
Kitchen 2 6 12
Toilet 1 6 6
Shower 2 6 12
After Retrofitting the total power requirement of an apartment 110 W
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10. After retrofitting, electricity consumption and
monthly bill of an apartment
Electricity consumption per day: 0.904 KWh
Total consumption per month: 27.12 KWh
Monthly electricity bill: 81.36 rubles (1 KWh = 3
ruble)
Annual electricity bill: 976.32 rubles
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11. RESULTS – FOR 100 APARTMENTS
Total investment for changing lamps: 273,000
ruble (1 bulb, 210 ruble; 1300*210= 273,000)
Annual Economy by reducing electricity bill:
6523.2*100 - 976.32*100 = 554,688 ruble
Payback period: 273,000/554,700 = 0.49 years =
6 months
Amount of electricity saving per month: 181.2*100
- 27.12*100 = 154* 100 = 15,408 KWh
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12. CONCLUSIONS
Replacing the present traditional lights by LED
lights in our buildings would result in;
lower electricity bills
energy conservation
Furthermore,
the process is quite feasible and economically
viable.
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