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IMPROVEMENT OF ENERGY EFFICIENCY
IN THE STREET LIGHTING SYSTEM OF THE
COLOMBO CITY
H.K. ILLEPERUMA
H.R.P. WANNIARACHCHISRI LANKA ENERGY MANAGERS ASSOCIATION
H.H.D. NANDASENACOLOMBO MUNICIPAL COUNCIL
Contents1.Colombo City – Statistics
2. Present Street lighting system- Colombo City
3. Present Street lighting system-Selected Area
4. Findings of the Survey
5. Possible Energy Saving Measures
6. Implementation Plan
Statistical Data of Colombo City
Area 37 sqkmPopulation 1.7 millionNo of Retail Customers 120,000No of Bulk Customers 1200 Total Electricity Sales790 GWh/yearElectricity Units billed
for Street lighting 10 GWh/year
Electricity Distribution System is operated and maintained by Ceylon Electricity Board
Street Lighting System is operated and
maintained by Colombo Municipal Council (CMC) under 6 districts
Colombo City
250W SV Main Roads
250W MV and Others By roads
150W SV By roads /Footpaths
125W MV Footpaths/Gardens
Present Street Lighting System
Recently CMC has adopted following basis in installation of Street Lights
There are about 12,000 Street Lamps in the CMC Area
834 MWh of energy is consumed per month @ Rs 7.80 per unit, results in a monthly bill of Rs 6.5 million
Present System Contd..
Number of Street Light Luminaries
45%
15% 20%
20%
250W SV
150W SV
125W MV
250W MV andothers
Street Light Load in kW
1687.5
337.5
375
525250W SV
150W SV
125W MV
250W MV and others
Present System Contd..
Operation of Street Lights 30% Automatically using photocells 70% Manually
Electricity Supply to Street Lights are from both overhead and underground lines
Load of Different Type of Lamps in the District 4 (Kirulopane Area)
26%
28%
1% 12%
33%
70 W SV
150W SV
250W SV
125W MV
250W MV
Present Street Lighting System- Kirulopane Area
Number of lamps in the District 4 (Kirulopane Area)
66262
448
716
385
70 W SV
150W SV
250W SV
125W MV
250W MV
In Study Area ....Classification of Roads
1. Main roads with high vehicular traffic
2. Roads connecting to main roads with substantial vehicular traffic and pedestrian traffic
3. Roads leading to residential areas and terminating.
Details of Street Light Luminaries in the Study Area
ROAD NAME 250W SV 150W SV 250W MV 125W MV26 30 32
GAJABA ROAD 15 1 9 5MAHINDA PLACE 8 5 3LAKSHMAN PLACE 1 5 6BALAHENA MULLA 1 8 5 2 3JAYASINGHA ROAD 5 9 9 4ROBERT GUNAWARDANA MAWATHA 4 16 18 2MUGALAN ROAD 11 11BALAPOKUNA ROAD 2 16 18HALGASWATTA ROAD 9 5 4NANDIMITTRA PLACE 1 7 3 5SURANIMALA PLACE 1 7 7 1PURANAVIHARA ROAD 1 2 3BALAPOKUNA PLACE 6 6MAHAWELA PLACE 6 3 4 5Total 12 22 14 96 70 35 39
POLE HEIGHT (FEET)
Robert Gunawardana Mw and Balapokuna Road connect to other main roads, carry considerable vehicular traffic.
Findings of the Survey
Luminaire Mounting Height & Height of Pole
Spacing of Lamps & Span of PolesLuminaire Position Switching SystemsLumen output of Lamps & Type of Lamps Maintenance of Street Lighting System
Use high efficacy bulbs & ballastUse more efficient luminariesTimely Switching on/offBy proper lighting designBy switching off some lights during low traffic
periodsBy dimmer units, reducing luminance during low
traffic hoursProper maintenance scheme.
Possible Energy Saving Measures
Possible Energy Saving Measures Use high efficacy Lamps & ballast
Replacement of Mercury Vapor lamps with High pressure Sodium Vapor lamps.• 125W MV ----> 70W SV• 250W MV ----> 110W SV
This can be done in two ways
Replace complete fitting for very old lights
Replace only the bulb & ballast for fairly new lights
Replacement of Mercury Vapour Lamps with Sodium Vapour Lamps 250W MV Lamps 110W SV Lamps
Description Study Area (14 lamps) District 4 (385 lamps)
Investment Rs.73,500 Rs.2,021,250
Annual Saving Life Cycle Saving
Rs.66,961Rs.293,4912
Rs.1,841,440Rs.8,068,830
Pay-back Period 13 months 13 months
125W MV Lamps70W SV Lamps
Can be installed along roads in residential areas
Recommended Mounting height is 6m at 30 to 35 m intervals
In future all the new installation in the residential areas should be with 70W SV
Comparison Between 125W MV & 70W SV
125W MV 70W SV
Lumen output 6875 8750
Annual energy consumption 548 kWh 307 kWh
Annual energy cost Rs. 4,271 Rs. 2,391
Life cycle energy cost Rs. 23,400 Rs. 13,104
Cost of fitting Rs. 4,600 Rs. 4,500
Life cycle cost Rs. 28,000 RS. 17,604
Life cycle Saving Rs. +10,396
Comparison between the replacement of 125W MV complete fitting and replacement of 125MV bulb & ballast only.
Complete fitting
Bulb only
Annual energy saving 241 kWh 241kWh
Annual energy saving Rs. 1,879 Rs. 1,879
Life cycle energy saving Rs. 10,296 Rs. 10,296
Investment Rs. 4,500 Rs. 2,000
Payback period 29 months 13 months
Life cycle saving Rs. 5,796 Rs. 8,296
Possible Energy Saving Measures
Timely switching on/offFixing of photoelectric cells for automatic
operation of lamps (for circuits & individual lamps)
Costs & Benefits of the Proposal Description Study Area District 4 Colombo
City
Investment Rs.86,400 Rs.780,000 Rs.5,040,000
Annual Saving : Energy LabourTotal Saving
Rs.15,374Rs.73,000Rs. 88,374
Rs. 170,229Rs.511,000Rs.681,229
Rs. 1,106,060Rs.3,285,000Rs.4,391,060
Payback Period 12 months 14 months 14 months
The level and uniformity of luminance along a road depend on several factors Lumen output of the light source Luminaire distribution Mounting height Luminaire position and Spacing Installation arrangement
Possible Energy Saving Measures
By proper system design
Luminaire Mounting Height & Height of Pole
Recommended Height of poles for different sizes of roads
Road Type Height of pole Mounting Height
Main roads 32 feet poles 9m
By roads 30 feet poles 7-8m
Foot paths/Gardens 26 feet poles 6m
Spacing of Lamps
It is required to maintain equal distances between street lamp poles.
Most effective distance is 35m to 40m. It is not economical to erect additional
poles for street lighting to maintain the equal spans in the existing system.
Overhang & Angle of Tilt
Overhang and Angle of tilt vary with the following Width of road Lumen Output of the lamp Height & Spacing of the poles
The most effective angle of tilt is 5 to 10 degrees and overhang is 0.75 to 1.5 meters, depending on the width of the road.
Maintenance Scheme for Street Lighting
Improve the light levels in the city and gradually the wattage of the lamps could be reduced.
Provide benefits not only the energy conservation but also the other benefits in terms of public safety, security, convenience and comport during darkness.
Maintenance program twice a year.
Possible Energy Saving Measures
Maintenance of the Street Lighting Should Include ....
Luminaire Maintenance luminaire cleaning is required to maintain
designed lighting levels. loss of lumen output of light sources due to
normal agingSupport Structure MaintenanceElectrical Distribution and Control System
MaintenancePruning of trees which disrupt light distribution
Implementation Action Plan
Proposal Investment Saving PaybackPeriod
Stage 1- No cost & low cost measures
Installation Photo Electric cells in the Study Area. Rs. 86400 Rs. 88,374 12 month
Replacement of 250W Mercury Vapour lamps with110W Sodium Vapour Lamps in the study area.
Rs. 73,500 Rs. 66,961 13 months
Replacement of 125W Mercury Vapour lamps in thenew fittings with 70W Sodium Vapour Lamps (Lamponly)
The statistics for thenew fittings are not
available
13 months
Carry out an audit to assess the energyconsumption of the street lighting system of CMC bythe Ceylon Electricity Board
Installation of 70W Sodium Vapour lamps only in theresidential areas which are new installations.
No additionalinvestment Rs. 12,327 per
lamp
Implementation Action Plan
Proposal Investment Saving PaybackPeriod
Stage 2- Medium cost measures
Installation Photo Electric cells in the District 4. Rs. 780000 Rs. 681,229 14 months
Replacement of 250W Mercury Vapour lamps with110W Sodium Vapour Lamps in the District 4.
Rs. 2,021,250 Rs. 1,841,440 13 months
Replacement of 125W Mercury Vapour lamps in thenew fittings with 70W Sodium Vapour Lamps (Lamponly) – in the District 4.
The statistics for thenew fittings are not
available
13 months
Implementation of Proposed maintenance Programin the District 4.
Rs. 800,000 + avehicle with a bucket
Implementation Action Plan
Proposal Investment Saving PaybackPeriod
Stage 3 – High cost measures
Installation Photo Electric cells in the whole CMC. 5040000 4,391,060 14 months
Replacement of 250W Mercury Vapour lamps with110W Sodium Vapour Lamps in the Whole CMCArea.
13 months
Replacement of 125W Mercury Vapour lamp fittingswith 70W Sodium Vapour Lamp fittings
29 months
Implementation of Proposed maintenance Programin the Whole CMC area.
Rs. 8,000,000+vehicles
Thank You !