P11462 Thermoelectric and Fan System for Cook Stove Jared Rugg Project Manager ME Brad Sawyer Lead Engineer ME Jeff Bird Mechanical Engineer Tom Gorevski Electrical Engineer Fahad Masood Electrical Engineer ID: 766133
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P11462: Thermoelectric and Fan System for Cook StoveJared RuggProject Manager (ME)Brad SawyerLead Engineer (ME)Jeff BirdMechanical EngineerTom GorevskiElectrical EngineerFahad MasoodElectrical EngineerDr. Robert StevensCustomerProfessor Edward HanzlikGuideH.O.P.E.Sponsor
Project DescriptionGoal: Develop a thermoelectric (TEG) power system for the first generation of RIT cook stove (project P10461)End user: Haitian VendorKey needs and specs:Use of TEG4 W output at 200 °C temp differenceProvide controllable air flow into stoveFlow Rate 0.3-0.7 kg/min2 Control Settings (Boil, Simmer)Charge an auxiliary devicePower 5 V USB device
System Architecture
Design ConceptHeat conduction beamHeat sinkFanElectrical systemBypassTEG (sandwiched between beam and heat sink)
High Risk AssessmentInsufficient TEG coolingTEG producing too little powerHeat conduction rod produces too little heatElectrical system consumes too much powerProduct cost
Current State of Design - PerformanceDesign meets customer needs except:5 year life-spanWell packaged systemAbility to charge auxiliary deviceFan runs at start-upDesign meets engineering specs except:Unit priceProduct life spanReplaceable component life spanAux chargingVolumeTime to reach peak performance
Current State of Design – Budget/ScheduleBudget = $500Total Amount Spent = $601Total Cost of System = Unknown at this point3 weeks behind schedule
System Testing ResultsMaximum hot side temp = 250 °CMaximum ΔT achieved = 150 °CMaximum power = 3 WUnable to start fans with batteriesSwitching worksCharging works but not to specificationNot enough power for USBBuck-boost produces ~9-9.5 V rather than 12 V
MSD I ScheduleWeek 2Part ArrivalWeek 4Integrate mechanical systemIntegrate electrical systemWeek 5Integrate all systemsLife cycle calculationsWeek 6Test variationsEngineering spec verificationWeek 7-8Write plan to apply to P11461’s stoveWork on 10,000 unit BOM
MSD II MilestonesWeek 3Mechanical system functionalWeek 6All parts in houseElectrical system completedSystem IntegratedWeek 9Functional demoPoster finalizedWeek 10Documentation finalized: Paper, Website
Project EvaluationSuccessesAble to power fan off of TEG semi-continuouslyAble to provide enough flow into fireAble to control air flow into fireFailuresNo USB functionalityFan unable to be powered off of batteriesBatteries charge slower than expectedAesthetic packaging
Future WorkMechanicalAdapt fan size and housing to next generation of stoveLook into effect of gradient across TEGInvestigate new rod designsResize rod and heat sink for new stoveBetter characterize effect of bypassInvestigate heat effect on spring lifeElectricalLocate more efficient circuitsExplore microcontroller integration for peak power point tracking and battery chargingDetermine why buck boost behaves differently than expectedDetermine why battery pack does not power boost converterExplore and characterize the effect of an inductive load on the boost converter