Role of Energy Audit in acheiving energy efficiency.

energy audit role in energy efficiency

1. Energy Auditing & Management

3. What is an Energy Audit ?
Energyauditisthefirststeptowardsystematic
effortsforconservationofenergy.Itinvolves
collectionandanalysisofenergyrelateddataon
regularbasisandinamethodologicalmanner.

4. Objectives of Energy Audit
TheEnergyAuditprovidesthevitalinformationbaseforoverall
energyconservationprogramcoveringessentiallyenergy
utilizationanalysisandevaluationofenergyconservation
measures.
Itaimsat:-
•Identifyingthequalityandcostofvariousenergyinputs.
•Assessingpresentpatternofenergyconsumptionindifferent
costcentersofoperations.
•Relatingenergyinputsandproductionoutput.
•Identifyingpotentialareasofthermalandelectricalenergy
economy.
•Highlightingwastage’sinmajorareas.
•Fixingofenergysavingpotentialtargetsforindividualcost
centers.
•Implementationofmeasuresforenergyconservation&
realizationofsavings.

5. The Role of an Energy Audit
Anenergyauditidentifieswhichareasinyourestablishment
unnecessarilyconsumetoomuchenergy,whereenergyisbeing
consumedandassessesenergysavingopportunities,whichis
themostcost-effectivetoimprove,soyougettosavemoney
whereitcountsthemost.
Inthefactory,doinganenergyauditincreasesawarenessof
energyissuesamongplantpersonnel.Anenergyauditineffect
gaugestheenergyefficiencyofyourplantagainst“best
practices”.Whenusedasa“baseline”fortrackingyearly
progressagainsttargets,anenergyauditbecomesthebestfirst
steptowardssavingmoneyintheproductionplant.

6. Stages of Energy Audit

7. Energy audit stages
Energyauditcanbecategorizedintotwotypes,namelywalk-
throughorpreliminaryanddetailaudit.
Walk-throughorpreliminaryaudit
Walk-throughorpreliminaryauditcomprisesonedayorfew
daysvisittoaplantandtheoutputisasimplereportbased
onobservationandhistoricaldataprovidedduringthevisit.
Thefindingswillbeageneralcommentbasedonrule-of-
thumbs,energybestpracticesorthemanufacturer'sdata.

8. Preliminary energy audit
• Establish energy consumption in the organization
• Estimate the scope for saving
• Identify the most likely (and the easiest areas for attention
• Identify immediate (especially no-/low-cost) improvements/
savings
• Set a 'reference point‘
• Identify areas for more detailed study/measurement
• Preliminary energy audit uses existing, or easily obtained
data.

9. Detailed Energy Audit
Thedetailedauditgoesbeyondquantitativeestimatesof
costsandsavings.Itincludesengineeringrecommendations
andwell-definedproject,givingduepriorities.
Approximately95%ofallenergyisaccountedforduringthe
detailedaudit.Thedetailedenergyauditisconductedafter
thepreliminaryenergyaudit.Sophisticatedinstrumentation
includingflowmeter,fluegasanalyzer,scannersandother
advancedinstrumentsareusedtocomputeenergy
efficiency.

10. Inputs and Outputs of Energy audit

11. Contents of an Audit
Anenergyauditassessestheeffectivenessofmanagement
structureforcontrollingenergyuseandimplementing
changes.Theenergyauditreportestablishestheneedsfor
plantmeteringandmonitoring,enablingtheplantmanager
toinstitutionalizethepracticeandhence,savemoneyfor
theyearstocome.Theenergyauditactionplanliststhe
stepsandsetsthepreliminarybudgetfortheenergy
managementprogram.

12. Steps for Energy Management and Energy audit….
•Analysis of energy use
•Identification of energy projects
•Cost benefit analysis
•Action plan to set implementation priority

13. 1. Analysis of energy use
Identifyingwhereenergyisusedisusefulbecauseitidentifies
whichareastheauditshouldfocusonandraisesawarenessof
energyuseandcost.
Analysisofenergyuseinthereviewofmanagementstructures
andproceduresforcontrollingenergyuse.Thisisagood
sourcedataforallocatingenergyuse.Theplantmanagercan
alsolistallequipmentusedandthecorrespondingoperating
hours.Withthisinformation,onecancreatespreadsheet
informationandgeneratechartsusefulforanalysis.

14. 1. Analysis of energy use
ImportantpointstobeconsideredwhencollectingSiteLoadData:
•Operatinghours-Thiscanbegatheredfromplantpersonnel.Itisimportant
toensuretheaccuracyofthisdatabecausemuchofthepotentialforenergy
savingsliesoncorrectestimationoftheequipment’soperatinghours.
•Dutycycle-Machinessuchaslargeelectricmotorshavevaryingloadsand
hence,differentpowerrequirements.
•Actualpowerconsumed-Forelectricpowerusers,thisisbasedoneither3-
phasecurrent/voltagereadingsorpoweranalyzermeasurements(e.g.,direct
kWwhichincorporatespowerfactor).Forfuelusers,tankreadingsofmonthly
consumptionestimatesandflowmeterswithtotalizationcanbesourcesof
measurementofair,water,steam,oiletc..

15. 2. Identification of energy projects
•Opportunitiesforenergysavingscanrangefromthe
simplest,suchaslightingretrofits,tothemostcomplexsuch
astheinstallationofacogenerationplant.Theimportant
thingtorememberistofocusonmajorenergyusersand
areas.Alwaysapplythe80/20rule,focusonopportunities
thatprovide80%ofthesavingbutrequire20%input.After
thepreliminaryidentificationofopportunities,spendmore
timeonthosewhichhaveshorterpaybackperiods.

16. 3. Cost benefit analysis
•Theidentifiedenergyconservationopportunitiesshouldbe
analyzedintermsofthecostsofimplementingtheproject
versusthebenefitsthatcanbegained.Ifyouwantto,say,
installaheatplateexchangertorecoverwasteheat,you
needtocalculatethetotalcostofinstallationandcompare
thatwiththesavingsyouwillderivefromrecoveringwaste
heat.Itmakessensetogoonwiththeprojectifthereisa
netpositivebenefitfromtheproject.

17. 4. Action plan to set implementation priority
•Afterpassingthecostbenefittest,anactionplanshouldbe
developedtoensurethattheopportunitiesidentifiedare
implemented.Theactionplanshouldincludeallthemajor
stepsforimplementingtheopportunityaswellasthe
peopleresponsible.

18. And finally, …
Thisprogramwillbesuccessfulwhenthetop
managementsoftheorganizationunderstandthat
energyauditproducesthehighestprofitsinthe
organizationataminimumcost.

19. References
1. www.bee.gov.in
2. https://nptel.ac.in/course.html