energy audit at nmc

7/28/2019 Energy Audit at NMC

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Energy Conservation Potential In Indian Municipalities -A Case Of Namakkal Municipality

National Productivity Council, India 1

ENERGY CONSERVATION POTENTIALIN INDIAN MUNICIPALITIES

A CASE OF NAMAKKAL MUNICIPALITY

A.ShajahanFormerly with National Productivity Council as

Deputy Director (Environment) Email : [email protected]

1. Background

The municipalities consume considerable amount of electrical energy towardsmeeting the needs of general public. A good amount of electricity is consumednot only to light the streets but also to pump the water for treatment and supply tothe public. In addition, there are a number of Government buildings whichconsume large quantity of electricity. While meeting the public needs is of primeimportance, energy efficiency takes a backseat. It is not uncommon to observestreet lights on even after the sun rise leading to the energy waste. While suchlosses are visible and obvious greater losses occur in pumping and distributing

water. Contrary to the popular adage Energy saved is Energy Produced oneunit of energy saved in the user-end leads to a saving of more than 2 3 units ofenergy generated. Thus saving energy not only conserves natural resources andreduces cost but also helps in mitigating climate change by reducing GHGemission.

Keeping this in view, an energy audit was conducted by the National ProductivityCouncil, India in Namakkal town in collaboration with Namakkal Municipalityunder Green Productivity Demonstration Project (GPDP) sponsored by APO as amodel case for making town an Eco-city.

Namakkal Municipality was established in the year 1970 and has an area of10.24 sq. kms. It has 30 wards, 110 streets and 53041 population. The totallength of the roads is 53.78 kms.

Being a progressive municipality it had, much before the audit, implementedseveral energy efficiency measures such as Installation of High efficiencySodium Vapour Lamps, Timer controlled switches for street lighting and


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Installation of capacitors to maintain near unity power factor for its pumpingstations.

2. Energy use pattern

Electricity is the major source of energy used for water supply system and streetlighting services. Diesel is the other form of energy used for transport vehiclesand standby DG sets. Since the consumption of diesel is insignificant, it is notconsidered as a part of the study.

Total Annual Energy Bill

Electricity,

Rs.124

Lakhs

Diesel

Rs. 10

Lakhs

3. Energy Audit and Analysis

Energy audit and analysis was conducted for all the electrical energy use areas.The findings are as follows:

Equipment / System Performance /Efficiency

Remarks

Contract Demand at head worksand booster station

Max. Demand = 156KVA

Scope for reducing theContract Demand and avail

tariff benefitsPump at River head works of

Old Scheme86 % Good Efficiency

Pump at Booster PumpingStation of Old Scheme

49% Imperfect matching of pumpwith the pumping system

Pump at River head works ofNew Scheme

81 % Good Efficiency

Pump at Booster PumpingStation of New Scheme

59.24% Imperfect matching of pumpwith the pumping system

250 W Sodium Vapour lamps inMain Roads

High luminance ofmain roads

Shops and Establishmentshave their own lighting in

front

Components of energy bill

Water

Pumping

48%

Municipality

Buildings

28%

Street

Lightig

20%

Borewell

WaterSupply

4%

Annual Electricity bill 2004 - Rs. 1. 24 Crores


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75 W Sodium Vapour lamps inStreet lighting

Poor luminance Due to poor colouring index

40 W Fluroescent lamps withMetallic choke in Municipal office

lighting

High powerconsumption

Lamp (40W) and choke (17W)

High Mast Lighting High Power

consumption (400 Weach)

All lights are on even during

lean period of 11 P.M to 4A.M

Signal Lighting at Clock tower High Powerconsumption of 250 W

Incandescant lamps used.(Less Energy Efficient)

4.0 Summary Of Energy Saving Recommendations

Based on the energy audit and analysis, energy saving measures were evolved.After discussions with municipal officials. The trials suggested by the NPCexperts were also conducted by municipal officials and they also participatedactively in the analysis of energy use and data. The evolved energy savingmeasures were evaluated for annual energy saving potential, investment andpayback period which are presented in the table below.

S.No.

Energy SavingRecommendations

Annual EnergySaving Potential

EstimatedInvestment

SimplePay Back

Period

Quantity(kWh)

Rs. Rs. Months

1. Reduce the contractdemand for Mohanur headworks

33 kVA 80,000(US$ 1778)

Nil -

Sump

Distribution

Old Scheme

Booster

Pumping

Station

Overhead

tanks

40 HP (30 kW)

Flow -1290 LPM

Head100 m

40 HP (30 kW)

Flow -1320 LPM

Head77 m

9.65 km

9.31 km

Cast iron

pipe 9

Cauveryriver

Mohanur Aniapuram Nammakkal

Sump

Distribution

New Scheme

Booster

Pumping

Station

Overhead

tanks

40 HP

9.65 km

9.31 km

120HP (90 kW)

Flow3600 LPM

Head96.2 m

RCC pipe

12

Cauveryriver

75 HP (55 kW)

Flow3120 LPM

Head75 m

Mohanur Aniapuram Namakkal


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2. Reduce the contractdemand for Aniapurambooster station

14 kVA 33,600(US$ 747)

Nil -

3. Provide energy efficientpump at Aniapurambooster station (old

scheme)

75,000 3,00,000(US$6667)

50,000(US$ 1000)

2

4. Provide energy efficientpump at Aniapurambooster station (NewScheme)

1,00,000 4,00,000(US$ 8889)

50,000(US$ 1000)

Less than 2

5. Reduce the wattage ofsodium vapour lamps

1,45,854 5,00,000(US$ 11111)

Replacementonly if the

existing lampfails

-

6. Replace 75 W sodiumvapour lamps with 40 Wfluorescent lamps

2857 10,000(US$ 222)

Replacementonly if the

existing lamp

fails

-

7. Provide energy savingdevice in Municipalityoffice lighting

2233 13,400(US$298)

12,000(US$267)

11

8. Change switching strategyfor high mast lighting

2667 16,000(US$356)

6000(US$133)

5

9. Change to efficient LEDlamps for signal lighting atclock tower

1000 6000(US$133)

6000 12

Total 329611 13,64,000(US$30,311)

- -

Total electricity bill 2004 - Rs. 1.24 crores ((US$275556)

Energy saving potential - Rs. 13.6 lakhs(US$30,222)

Percentage cost savings potential - 11%

5.0 Conclusion

Namakkal Municipality is implementing the recommended Energy saving

measures in the right earnest and the savings will be achieved in the months tocome. These efforts of Namakkal Municipality will stimulate other municipalitiesin India and other developing countries to take up similar work and reap thebenefits.

energy audit at nmc

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