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- Team Members Jeffrey Kung Richard Sabatini Steven Ngo Colton
Filthaut 2 Faculty Advisor Jim Mohrfeld Underclassmen Walter Campos
Alan Garza Industry Advisor Christopher Keller
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 3
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 4
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- To have a working Stirling Engine that will serve as a portable
generator capable of producing 2.5 kWh (3.4HP) To be able to run
multiple common household appliances simultaneously 5
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- Appliances (average): Refrigerator/Freezer = Start up 1500
Watts Operating = 500-800 Watts Toaster Oven = 1200 Watts Space
Heater = 1500 Watts Lights: Most common are 60 Watt light bulbs
Tools (average): Drill = 750 Watts 1 Drill = 1000 Watts Electric
Chain Saw 11-16 = 1100-1600 Watts 7-1/4 Circular Saw = 900 Watts
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 7
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 10
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- 11 FuelDensityPracticalityPriceMax Temperature Propane Gas2.01
g/cm$2.48 per gallon1800 C 5435 Electric Burner (1.4 kW) ~16 per
kWh800 C ~152 Gasoline.75 g/cm$3.504 per gallon1000 C 2423
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- 12 Working Fluid Thermal Conductivity Absolute Viscosity
Specific Heat Gas Constant Safety/ Practicality Nitrogen.026 W/m C
0.018 centipoises1040 J/kgK297 J/kgK 13113 Helium.149 W/m C0.02
centipoises5188 J/kgK2077 J/kgK 34334 Hydrogen 0.182 W/m C0.009
centipoises14310 J/kgK4126 J/kgK 4154 1
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- Melling Cylinder Sleeve Cast Iron Cylinder High in Strength
Thermal Conductivity 55 W(m.K) Would Need to be Bored/Honed 13
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- 14 Displacer Piston Cummins KT 19 Forged Aluminum High in
Strength Density of 0.101 lb/cu. in. Power Piston Yamaha Grizzly
660 Forged Aluminum High in Strength Density of 0.101 lb/cu.
in.
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- BrandVoltageAmpsTorque Req.PriceTotal Mechman14 Volts240A8.092
lb-ft$350.00 434415 Eco-Tech14 Volts325A9.000 lb-ft$1500.00 453110
DC Power14 Volts250A10.924 lb-ft$590.00 442313
https://www.dcpowerinc.com/http://www.ecoair.com/http://www.mechman.com/
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 16
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- Base Engine Requirements (RPM, Power) Engine Calculations
(Heat, Dimensions, Pressure, Work) Heat Transfer & Regenerator
Calculations Efficiency &Total Work Loss Calculations 17
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- Variables Connecting Rod Length (L) Crankshaft Arm Length (R)
Force on Piston (F) Mass of Piston (M) Angular Velocity () 900 rpm
required => ()= 94.25 rad/s 18 F L R M Crank-Slider mechanism
Power and Displacer Piston
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- 19 Displacer Piston Diameter: 6.25 (Piston) Connecting Rod
Length (L): 5.375 Crankshaft Arm Length (R): 1.75 (3.5 Stroke) Mass
of Piston (M): 25 lbm 1.6:1 Piston to Displacer dia. Ratio Power
Piston Diameter: 4 (Piston) Connecting Rod Length (L): 5.375
Crankshaft Arm Length (R): 1.75 (3.5 Stroke) Mass of Piston (M):
1.561 lbm Regenerator Flywheel
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- 20 Piston Acceleration and Force Power Piston Acceleration
Power Piston Force Displacer Piston Acceleration Displacer Piston
Force
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- 21 Required Force
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- 22 Work/ Kinetic Energy(N*M)
http://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 psi Displacer piston dia: 6.25 Power
Piston dia: 4 20% Mechanical Friction loss RPM=900
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- 23 Force Delivered to Force Required Check and Balance
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- 24 Torque ; ;
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- A D E C A B 25 Torque Related to Kinetic Energy Preferred
Method WORK delivered from PRESSURE= 208.333 N*M WORK remaining
after FRICTION= 166.664 N*M STORE HALF of the energy to be
delivered for UPWARD movement of POWER PISTON (=180 to 360)
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- 26 Flywheel is typically set between.01 to.05 for
precision
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- 27 Crankshaft Sn= Endurance Strength=0.50 (UTS) Sn=Fatigue
Endurance Strength Cm= Material Factor= 1.0 Cst=Type of Stress
Factor= 1.0 Cr= Reliability Factor= 99%=.81 Cs= Size factor=.88 N=
safety Factor= 2
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- 28 http://enginemechanics.tpub.com/14037/css/14037_90.htm
Overview Pressure= 2.1 MPA (220 PSI) 20% Energy Loss= 21.7 N*M
K.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
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- 29 Manufacturing
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- 30 Manufacturing Yamaha Grizzly 660 Mazda Miata Rear Drive
Hub
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 31
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- First Order Design Method Calculate Ideal Adiabatic &
Isothermal Conditions. Analyze changes in temperature, pressure
& volume in order to get an estimated power output Calculate
initial engine parameters ( Swept Volumes, Dead volumes, Change in
mass, Stroke Lengths, & rotational speed) Create a finished
first order Design Calculation Sheet allowing us to obtain the
previous variables. Second Order Design Method Calculate real life
conditions & losses (gas pumping/friction losses, heat transfer
rate, porosity, mass flow rate of gas, vibrational forces,
principle stress, fatigue rate) Design & Calculate regenerator
parameters, tubing dimensions, & Fin parameters. Design &
Build a calculation sheet allowing us to obtain several arrays of
values for each variable in order to find the best engine operating
conditions 32
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- 33 Total Net Work(Joules) Power Output(Watts) Total Volume
=MAX(Vexp+Vcomp+Vdead) Total Volume = (7065.3 cm^3)
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- 34 We 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 Stirling
Program imported into Excel Freq. (Hz.) Power (Watts) Therm. Eff.%
Torque (N.m) Pressure (Pascals)
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- 35 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 Watts
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- Tubes Regenerator Fins 36 Reduces heat by maximizing surface
area, allowing the outside Air to flow more freely over the tubes
Reduces heat by the use of porous material, which catches &
conducts the hot air as it flows through steel mesh Thin long
blades that consist of a more thermally conductive metal will
extend out into the environment dissipating heat through convection
by air
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- 40 Max Hoop Stress Equals= 14,368 psi Allowable Yield Stress
for ChromMolly AISI 4140 at 600C is 60,400psi or (417MPa) Max
Operating pressure is 376 psi
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- Regenerator Design- Reduces heat by a porosity matrix that
catches the heat as the helium flows through it Will store about 60
percent of the heat in the system 41
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- 42 Gasket Material Selection Actual Regenerator Housing The
Ideal gasket material we will use A spiral round gasket/
GraphiteFoil mix
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- 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) 43
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 44
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 47
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- Stirling Generator Research Concept & Feasibility Market
Research Cost Analysis Project Development Component Selection
Intro Design Design Detailed Design & Calculation CAD/CAM
Design Components Analysis & Data Results FEA Thermal Analysis
FEA Mechanical Analysis Fabrication Mechanical Components
Electrical ComponentsWBS 48 100% 61%-99% 31%-60% 100% 1%-30%
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- Goals Prototype Model Component/Material Selection Design
Mechanical Design Thermodynamic Design Cost Analysis WBS/Gantt
Chart Risk Matrix 51
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- 52 RiskMatrix
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- Plan, Plan, Plan Project management is incredibly crucial
Manufacturing takes longer than projected Selecting component
standards within the industry is key Start funding early Public
speaking is an acquired skill 53
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- 55 Cot-mect4276.tech.uh.edu/~stngo3