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Introduction. Team Members Jeffrey Kung Richard Sabatini Steven Ngo Colton Filthaut. Faculty Advisor Jim Mohrfeld. Industry Advisor Christopher Keller. Underclassmen Walter Campos Alan Garza. Agenda. Goals Prototype Model Component/Material Selection Design Mechanical Design - PowerPoint PPT Presentation

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Team Stirling

1

1Team Members

Jeffrey KungRichard SabatiniSteven NgoColton Filthaut

2IntroductionFaculty Advisor

Jim Mohrfeld

Underclassmen

Walter CamposAlan Garza

Industry Advisor

Christopher Keller

2GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

3AgendaGoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

4AgendaTo have a working Stirling Engine that will serve as a portable generator capable of producing 2.5 kWh

To be able to run multiple common household appliances simultaneously5GoalsAppliances (average): Refrigerator/Freezer = Start up 1500 WattsOperating = 500-800 Watts Toaster Oven = 1200 WattsSpace Heater = 1500 WattsLights: Most common are 60 Watt light bulbsTools (average): Drill = 750 Watts1 Drill = 1000 WattsElectric Chain Saw 11-16 = 1100-1600 Watts7-1/4 Circular Saw = 900 Watts

6Household AppliancesGoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

7Agenda8Stirling Engine Prototype Model

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

9Agenda10Heat SourceFuelDensityPracticalityPriceMax TemperaturePropane Gas2.01 g/cm$2.48 per gallon1800 C5435Electric Burner(1.4 kW)~16 per kWh800 C~152Gasoline.75 g/cm$3.504 per gallon1000 C2423

11Working GasWorkingFluidThermal ConductivityAbsoluteViscositySpecificHeatGasConstantSafety/ PracticalityNitrogen.026 W/m C

0.018 centipoises1040 J/kgK297 J/kgK13113Helium.149 W/m C0.02 centipoises5188 J/kgK2077 J/kgK34334Hydrogen0.182 W/m C0.009 centipoises14310 J/kgK4126 J/kgK41541

12Cylinder Material SelectionMaterialThermal ConductivityYield StrengthPriceMelting Temperature316 Stainless Steel14 W/(m.K)60,200 psi$74.00/ft1400 C5422304 Stainless Steel16 W/(m.K)31,200 psi$57.00/ft1450 C21444140 Chromoly Steel43 W/(m.K)63,100 psi$70.00/ft1430 C1533

http://www.onlinemetals.com/

http://www.onlinemetals.com/

http://www.onlinemetals.com/

13Piston Materials

Ocyaniqueprofessionals.com

http://www.mahle.com/Displacer PistonForged SteelHigh in StrengthRetains HeatDensity of 0.279 lb/cu. in.

Power PistonForged AluminumLight WeightHigh in StrengthDensity of 0.101 lb/cu. in.BrandVoltageAmpsTorque Req.PriceTotalMechman14 Volts240A8.092 lb-ft$350.00434415Eco-Tech14 Volts325A9.000 lb-ft$1500.00453110DC Power14 Volts250A10.924 lb-ft$590.00442313Alternator Selection

https://www.dcpowerinc.com/http://www.ecoair.com/http://www.mechman.com/

1415Alternator Selection Calculation (Mechman)http://www.mechman.com/images/products-s-curve-big.png

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

16Agenda17Calculation ProcessVariablesConnecting Rod Length (L)Crankshaft Arm Length (R)Force on Piston (F)Mass of Piston (M)Angular Velocity ()900 rpm required => ()= 94.25 rad/s18Mechanical Analysis

FLRMCrank-Slider mechanismPower and Displacer Piston

19Mechanical AnalysisDisplacer Piston Diameter: 6.5 (Piston)Connecting Rod Length (L): 8.934Crankshaft Arm Length (R): 2.625 Mass of Piston (M): 10 lbm1.625:1 Displacer to Power dia. Ratio Power Piston Diameter: 4 (Piston)Connecting Rod Length (L): 5.956 Crankshaft Arm Length (R): 1.75Mass of Piston (M): 1.561 lbm

RegeneratorFlywheel20Mechanical AnalysisPiston Acceleration and Force

Power Piston Acceleration

Power Piston Force

Displacer Piston Acceleration

Displacer Piston Force

21Mechanical AnalysisRequired Force

22Work/ Kinetic Energy(N*M)

Mechanical Analysishttp://cnx.org/content/m32969/latest/

KEY POINTS

Work being delivered to the system from 0 to 180 degrees (downward direction)Starting pressure when =0: 221 psiDisplacer piston dia: 6.5Power Piston dia: 420% Mechanical Friction lossRPM=900

23Mechanical AnalysisForce Delivered to Force Required

Check and Balance24Mechanical AnalysisTorque

-1

;;

ADECAB

25Mechanical AnalysisTorque Related to Kinetic Energy

Preferred MethodWORK delivered from PRESSURE= 208.333 N*MWORK remaining after FRICTION= 166.664 N*MSTORE HALF of the energy to be delivered for UPWARD movement of POWER PISTON (=180 to 360)

26Mechanical AnalysisFlywheel

is typically set between .01 to .05 for precision

2627Mechanical Analysis

P

http://enginemechanics.tpub.com/14037/css/14037_90.htmOverview

Pressure= 1.5 MPA (220 PSI)

20% Energy Loss= 21.7 N*MK.E.=166.7 N*M

Storing Half K.E. @ 0 to 180 ) Deliver K.E. @180 to 360=

83.36 N*M

Constant Torque= 26.5 N*M

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

28Agenda29Our Current Design Progress30First Order Design Method Total Net Work(Joules) Power Output(Watts)Total Volume=MAX(Vexp+Vcomp+Vdead)Total Volume= (7065.3 cm^3)

It was not possible to run a second order analysis by simple calculations & equations because of the enormous amount of unknown variables so we built a program in MATLAB capable of running arrays & guess values to arrive at possible values

Our process for the Second Order Design Method. Build Calculation Sheet On Excel capable of giving us accurate basic parametersDesigned MATLAB program capable of calculating numerous amount of engine variables at different speeds & pressures Re-Designed Excel sheet to incorporate data from MATLAB program31Second Order Design MethodSecond Order Results 32We have picked 15 Hz (900RPM) because we can achieve a high enough torque to up-gear our engine ratio 3:1 giving us 2700(RPM) at a high output power of 3010 (watts)

Output values from StirlingProgram imported into ExcelFreq. (Hz.) Power (Watts) Therm. Eff.% Torque (N.m) Pressure (Pascals)33Second Order Results

Wout= net work done by entire engine

Pe*dVe= The change in expansion volume as a function of expansion space pressure

Pc*dVc=The change in compression volume as a function of compression space pressure

Work in expansion space= 7162.2(Joules)Work in compression space= -6961.4(Joules)

Pout= (7162.2)(J)+(-6961.4)(J) *(15Hz)=3010 Watts34Second Order Results35FEA ANALYSIS

Max Hoop Stress Equals= 14,368 psiAllowable Yield Stress for ChromMolly AISI 4140 at 600C is 60,40psi or (417MPa)Max Operating pressure is 376 psiRegenerator Design- The regenerator reduces the heat transferred from expansion cylinder to compression cylinder by incorporating several small tubes & cylinder housing containing a porous mesh material which catches heat

The tubes help dissipate heat by maximizing surface area to help enable the convection of heat.

The tubes also help control the pressure & gas flow by causing a pressure drop which increases the gas velocity

36Second Order Design

As the swept Volume increases by a factor of x the # of tubes must also increase by that factor(if you double the volume you double the tubes)

37Second Order Design

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

38Agenda39Cost Analysis

3940Sponsorships & Donations

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

41AgendaWBS42100%61%-99%31%-60%100%100%100%100%1%-30%

43Gantt Chart (Year)44Gantt Chart (Semester II)

GoalsPrototype ModelComponent/Material SelectionDesignMechanical DesignThermodynamic DesignCost AnalysisWBS/Gantt ChartRisk Matrix

45Agenda46RiskMatrix

46

4748Questions?Cot-mect4276.tech.uh.edu/~stngo3


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