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thermoacoustic refrigeration

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thermoacoustic refrigeration

  1. 1. TAR
  2. 2. THERMOACOUSTICREFRIGERATIONBYBHAVYA RANI U
  3. 3. PRESENTATION TOPICBACKGROUND INFORMATIONTHERMOACOUSTIC CYCLEFUNDAMENTALS OF THERMOACOUSTIC THEORYDESGNAPPLICATIONCONCLUSION
  4. 4. UNPRESSURIED SYSTEMAIR AS GAS MEDIUMLOUDSPEAKER ASACOUUSTIC DRIVERVARIABLE DESIGN[STACK]THERMOACOUSTIC REFRIGERATION ISUTILIZATION OF ACOUSTIC POWER TOGENERATE TEMPERATURE DIFFRENCE
  5. 5. Convention refrigerator• Compressor• refrigerantsThermo acoustic refrigerator• Loudspeaker• Inert gasesDifference between convention refrigeration andthermo acoustic refrigeration
  6. 6. THERMOACOUSTIC’S BENEFITENVIRONMENTALREGULATION• NO CFC EMISSIONDESIGN• SIMPLE AND ROBUST DESIGNPRODUCTION• COST EFFICIENTMANUFACTURING
  7. 7. Motivation• Pros– Uses sound for refrigeration –no harmfulchemicals (CFC’s, HFC’s, HCFC’s)– Few moving parts—more reliable– Not harmful to the environment• Cons– Most efficient is approaching 40% of Carnot limit– 20-30% overall efficiency
  8. 8. MAIN PROTOTYPE COMPONENTS
  9. 9. • POWER CAPACITY• FREQUENCYRESPONSECONSIDERATION• 10 INCH• OPERATING ATLOW FREQUENCY• 400W MAXPOWERCHOICE
  10. 10. CONSIDERATION• PHYSICAL PROPERTIES• SEALING• COSTCHOISE• AIR• ATMOSPHERIC PRESSURE
  11. 11. CONSIDERATIONS•LENGTH•DIAMETER•SOUND REFLECTION•LOW ACOUSTICLOSSES•SOUNDTRANSMISSIONCHOICE•1.5” PVC TUBE•FLAT END
  12. 12. CONSIDERATIONSGAP SIZEMATERIAL PROPERTIESMATERIAL THICKNESSLOCATIONLENGTHDOES NOT IMPEDE WAVECHOICEPAPERALUMINUM SCREENSTACK
  13. 13. ConsiderationsMaterialTypeChoiceAluminumWater CirculatedHEAT EXCHANGERS
  14. 14. DESIGN OPTIMIZATION FLOW CHARTTARGETPARAMETERRESONATORLENGTHOPERATINGCONDITIONFABRICATION CONVERGEOPTIMISATIONFREQUENCYAVERAGEPRESSURETYPE OF GASSTACKMATERIALSTACKLOCATIONWAVELENGTHDYNAMICPRESURRETHERMALCONDUCTIVITYSPECIFICHEATCAPACITYSTACKSPACINGSTACKGEOMETRYRESONATORGEOMETRYPOWER/BOUNDRY LAY ER TRADEOFFHEATADDITIONTEMPARATUREHEATREJECTIONTEMPERATURECOOLINGTEMPERATURECOOLINGPOWERMAXIMISEENGINEEFFICIENCYMAXIMISEREFRIGERATORCOPMAXIMISEOVERALL COPMINIMISESIZEMAXIMISEPOWER
  15. 15. ASSUMPTIONS• WAVE PROPOGATION IS AXIAL AND PLAIN• WAVE MOTION PROCESS ARE ISENTROPIC• THE WORKING FLUID’S OF VISCOUS FORCE ARENEGLIGIBLE• THE RESONATOR AND COMPONENTS AREACOUSTICALLY RIGID• THE MEAN TEMPERATURE IS MUCH LARGERTHAN DEVOLPED TEMPERATUREGRADIENT•THE ACOUSTIC WAVE LENGTH IS MUCH LARGERTHAN THE STACK LENGH
  16. 16. MOVING COIL LOUDSPEAKER• INSIDE 2 MAGNETS WITH METAL COIL BETWEEN THEM, CURRENT IS INDUCED CAUSINGCOIL TO MOVE• CREATES SOUND WAVES UP TO 200 DB!RESONATOR— WHERE GAS COOLING AND COMPRESSION TAKE PLACE•USES INERT GAS, COMMONLY HELIUMSTACK• SERIES OF SMALL PARALLEL CHANNELS THROUGH WHICH PRESSURE ANDVELOCITY OF WAVES CHANGE• IN BETWEEN THE HEAT EXCHANGERSHEAT EXCHANGERS• HOT HEAT EXCHANGER TO REMOVE EXCESS HEAT• COLD HEAT EXCHANGER FOR REFRIGERATIONHOW IT WORKS
  17. 17. EFFICIENCY
  18. 18. APPLICATIONNASA• PRESERVE BLOODAND URINESAMPLES•STAR USEDFOR SPACESHUTTLEMISSIONUS NAVY• WANTS ACOUSTICREFRIGERATORS FORSUBMARINES NOHARMFUL FLUIDS• REFRIGERANT LEAKSON SUBS ARE ADEADLY PROBLEM• COOL RADARELECTRONICSONBOARD WARSHIPPOTENTIAL• SATELLITE SENSOR• SUPERFASTCOMPUTER• BEN &JERRYS ICECREAM STORAGECONTAINERS
  19. 19. A/C and Refrigeration Technologies ComparedTechnologyUnder DevelopmentCurrent TechnologyRecently IntroducedTechnologyRecently IntroducedTechnologyRelative PerformanceMeasuresThermoacoustics Vapor Compression Hydrocarbons Carbon DioxideOzone Depletion Potential None CFCs, HCFCs None NoneGreenhouse Effects None Very High Low LowEnergy Efficiency - powergridHigh Moderate Moderate High ModerateEnergy Efficiency - solarpower100% Not Practical Not Practical Not PracticalOperating Mode Proportional On/Off On/Off On/OffInitial Equipment Costs Low High High Very HighMaintenance Costs None Moderate Moderate Moderately HighOperating Life Cycle Very Long Moderate Moderate Moderate
  20. 20. MARKET REPORTAS PER TEKIN OZCAY IN CANADATHE STUDY IS MAINLY BASED ON THE SECONDARY RESEARCH THAT IS CONDUCTED ONWIDE VARIETY OF RELEVANT MATERIALSMARKET SIZE: 830,000 REFRIGERATORS ANNUALLY SOLD IN CANADASALES OF MAJOR HOUSEHOLD APPLIANCES: $ 1.4 BILLION COMPETITION: ELECTROLUX (FRIGIDAIRE) GENERAL ELECTRIC KENMORE MAYTAG WHIRLPOOL PLUS 30 OTHERS
  21. 21. CONCLUSION• A THERMO ACOUSTIC ENGINE STUDIES IN THE COMBINED THERMOACOUSTIC ENGINE REFRIGERATOR SYSTEMS AREA ARE ONLY A HANDFUL• THIS WORK IS ONLY ONE IN OPEN LITERATURE TO USE STANDING WAVETHERMO ACOUSTIC REFRIGERATOR SYSTEMS TO COOL HIGHTEMPERATURES• ANALYSIS OF TAR CAN BE OBTAINED BY SOFTWARE DELTA WHICH ISUSED TO INVESTIGATE PARAMETERS LIKE PRESSURE ,TYPE OF GASFREQUENCY
  22. 22. REFERENCES• A THERMOACOUSTIC ENGINE REFRIGERATORSYSTEM FOR SPACEEXPLORATION MISSION BY SUDEEP SASTRY• THERMOACOUSTIC REFRIGERATION BY STEVEN L GARRET AND THOMAS JHOFLER• EVALUATION OF THERMO ACOUSTIC CYCLES FOR COOLING APPLICATIONSBY INSU PAEK*, JAMES E. BRAUN, AND LUC MONGEAU RAY W. HERRICKLABORATORIES, SCHOOL OF MECHANICAL ENGINEERING, PURDUEUNIVERSITY WEST LAFAYETTE, INDIANA, USA• MARKET FEASIBILITY STURY OF THERMOACOUSTIC REFRIGERATION BYTEKIN OZCAY• DESIGN OF THERMOACOUSTIC REFRIGERATOR BY ANDERS MURILLOMILLIKEN TAYLER

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