EVALUATION OF HEAT DISSIPATION FROM …

1 February 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenancebyEVALUATION OF HEAT DISSIPATION FROM RADIATORS OF TRANSFORMER BY MEASUREMENT AND COMPUTATIONAL FLUID DYNAMICS SIMULATIONSDr. SACHIN B. PARAMANE1 CROMPTON GREAVES LTD. 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance2 Agenda Background and Motivation Objective Problem Description Experimental Radiator Test Set Up Measurement and CFD Analysis Results Comparison Catalogue Data, Measurement and Simulation ConclusionsFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance3 IntroductionTransformer failureWinding failure ThermalManagementisanimportantaspectfore fficientandreliablefunctioningoftransfor mers.

2 Radiator-fanconstitutesmajorcomponentsof thecoolingsystem ForOptimalThermalDesignTransformermanufa cturersareinterestedtoreducethenumberofr adiatorsandfansThermography imageFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance4 Radiator Heat DISSIPATION Perspective Aradiatorismechanicallyasimpleobject,but fromthermo-hydraulicpointofviewdifferent parametersinfluencetheheattransfercharac teristicsoftheradiator. Airvelocityaroundtheradiatorpanels,Tempe raturedifferenceoil-air Oilvelocityinsidetheradiatorpanels,which dependson: PumppressureorThermosyphonpressure: Hydraulicresistanceoftheradiatorpanelsan dhydrauliccircuit. 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance5 Background and Motivation Heatdissipationtablesareusedforselection ofradiatorswhicharesetupforairnaturalflo w.

3 Correctionfactors-overdesignofthecooling systemandifnotthentoohightemperatureandf ailures. Foroptimaldesign,accurateheatdissipation fromradiatorsshouldbeknownforvariouscool ingconfigurations. DISSIPATION TablesFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance7 Details of Radiators for EVALUATION 4 30 Height 3m Finspacing-50mm 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & Maintenance8 Experimental Test Set Up Anin-houseexperimentalfacility.

4 Agroupof4radiatorsmountedonasupportstruc tureandconnectedbypipes. Testsetupiscapableoftestingofradiatorsfo rallcoolingconfigurations. Temperaturemeasurement-Ktypethermocouple s Insertedpower-Wattmeter Flowrate-OilflowmeterFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceExperimental Measurement Inletandoutlettemperaturesofradiatorsare recordedbythedataacquisitionsystem. Datareductionforthecalculationofheatdiss ipationaftersteadystate .. oilpinoutQ m c TT Thermography(usinginfraredcamera) 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceCFD Simulation Details Complete3 Dgeometryoftheradiatorforanalysis Hexahedralmeshforbetterconvergenceandacc uracy Turbulencemodel-ShearStressTransport(SST ) Radiationmodel-DiscreteTransferModel(DTM ) C Convergence-residualsarebelow10-4 February 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceExternal Heat and Fluid Flow of Air Aplumeofhotairexitingatthetopoftheradiat or.

5 Theradiatorsworkasakindofopenchimney,air isheatedupinbetweentheradiatorfinsandthi shotairtendstomoveupwardsduetobuoyancyfo rcesFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceHeat Flux Distribution Aredcoloredfootprintofhigherheatfluxonth esurfaceoftheradiators. heat flux on end finsFebruary 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceHeat DISSIPATION Distribution Convection and radiation are comparable for end fins Total heat DISSIPATION of end fins is 64% more than middle fins Average heat DISSIPATION per fin is : Convection and radiation Convection heat transfer is 84% and radiation 16% February 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation, Operation & MaintenanceHeat DISSIPATION Comparison and Remarks Manufacturer Ifthesetablesaredirectlyused, 22nd-23rd, 2017, Scope Complex, LodhiRoad, New Delhi, India 6th International Conference on Large power transformers Modern Trends in Application, Installation.

6 Operation & MaintenanceConclusions Anin-houseradiatortestsetupisbuiltforhea tdissipationevaluationofradiatorsanddata setisgenerated ResultsofCFDisingoodagreementwithmeasure dresults Heatdissipationprovidedinthemanufacturer Actualmeasuredheatdissipationfromtheradi atorsfordifferentcoolingconfigurationswi llhelpinoptimalandefficientdesignoftheco olingsystemofthetransformer