1. Municipal Energy Efficiency in Sri Lanka D D Ananda Namal Palitha Subasinghe Sri Lanka Energy Managers Association S Thiyagarajah - CMC SEWAGE REMOVAL IN CMC

2. Background North Outfall South Outfall 6 Pumping Stations 7 Pumping Stations 300,000 kWh per Month 1800 kVA per Month Rs 3 Million per Month

3. Objective Efficiency Improvement in Sewage Pumping Stations Energy Cost Saving Benefits - CMC kWh SavingkVA Saving National Benefits More Energy to Others

4. Scope Energy Audit in North Outfall Network Establish Present Energy ScenarioEstablish Present Energy Scenario Identify Energy Conservation OpportunitiesIdentify Energy Conservation Opportunities

5. North Outfall Network Wanathamulla St.John marketMadampitiya Maligawatta MattakkuliyaHabour Junction Box 60 1800 510 328 450 180

6. Typical pumping station Bucket Elevator Screen Sump Electrical Meters Level Sensors Level meters Hour meters Flow recorders Pressure Gauges

7. Wanathamulla PS 1212 22.4 Pump No Power (kW) RatedMeasured 17 Not working 2100 kWh per Month Rs 18,000 per Month

8. Maligawaththa PS 12341234 74.6 149 37.3 0.7 Pump No Power (kW) Power Factor RatedMeasured 67 Not working 22,000 kWh per Month Rs 275,000 per Month 180 kVA per Month

9. Maligawaththa Ps Recommendations Power Factor Improvement Annual demand saving= 625 kVA Annual energy cost saving= Rs 250,000 Likely investment= Rs 150,000 Simple payback= 7 Months CAPACITOR BANK 25 kVAr X 6 Fully automatic operation for optimum pump selection

10. Madampitiya PS 4 6 1,2,3,5 223.8 0.77 0.82 Pump No Power (kW) Power Factor RatedMeasured 202 210 Not working 98,000 kWh per Month Rs 1,109,500 per Month 572 kVA per Month Fully Automatic - But Operated manually

11. Madampitiya Ps Recommendations Reactivate fully automatic operation Replace existing two motors with lower capacity motors Power Factor Improvement Annual demand saving= 875 kVA Annual energy cost saving= Rs 350,000 Likely investment= Rs 600,000 Simple payback= 20 Months CAPACITOR BANK : 50 kVAr X 6

12. Mattakkuliya PS 123123 44.7 0.92 Pump No Power (kW) Power Factor RatedMeasured 39 Not working 160,00 kWh per Month Rs 160,000 per Month 50 kVA per Month Normally only one pump working Rainy days - Two

13. Mattakkliya Ps Recommendations Introduce fully automatic operation Replace existing one motor with Low/high capacity motor Power Factor Improvement Annual demand saving= 130 kVA Annual energy cost saving= Rs 52,000 Likely investment= Rs 60,000 Simple payback= 14 Months CAPACITOR BANK : 15 kVAr X 4

14. Harbor PS 12341234 149.2 93.3 44.8 0.77 0.79 Pump No Power (kW) Power Factor RatedMeasured 122.5 75.5 Not working 25,000 kWh per Month Rs 310,000 per Month 200 kVA per Month Manually operated

15. Harbor PS Recommendations Fully automatic operation for optimum pump selection Power Factor Improvement Annual demand saving= 500 kVA Annual energy cost saving= Rs 200,000 Likely investment= Rs 125,000 Simple payback= 8 Months CAPACITOR BANK : 25 kVAr X5

16. St John Market PS 12341234 44 0.88 0.89 Pump No Power (kW) Power Factor RatedMeasured 47 48 Not working 1200 kWh per Month Rs70,000 per Month 125 kVA per Month Operate 1/2 to 1 hrs per day manually in the morning

17. St John Market PS Recommendations Operate only one pump at a time - Annual Saving Rs 240,000 (600 kVA) Operation Co-relate with Harbor pumping station Power Factor Improvement Annual demand saving= 120 kVA Annual energy cost saving= Rs 48,000 Likely investment= Rs 60,000 Simple payback= 15 Months CAPACITOR BANK : 15 kVAr X 4

18. General Recommendations Prevent storm water coming into the system Repair/Replace faulty instruments Repair bucket elevator or introduce an Alternative Replace / Repair all the mal-functioning Pumps