Thermoelectrics: The New Green Automotive Technology · Fuel, Lube Oil CO CO. 2. Gasoline C ......
Transcript of Thermoelectrics: The New Green Automotive Technology · Fuel, Lube Oil CO CO. 2. Gasoline C ......
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Program Name or Ancillary Text eere.energy.gov
John W FairbanksVehicle Technologies Program
US Department of EnergyWashington, DC
Thermoelectrics: The New Green Automotive Technology
Presented at the 2011 Annual Merit Review DOE Hydrogen and Fuel Cells Program and Vehicle Technologies ProgramWashington, DCMay 9-13, 2011
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Vehicle Technologies Program eere.energy.gov
Petroleum Market Forecast
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Vehicle Technologies Program eere.energy.gov
Gasoline Prices 201X…
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Vehicle Technologies Program eere.energy.gov
Gasoline Prices 201X…
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Vehicle Technologies Program eere.energy.gov
Use Thermoelectrics to generate electricity for powering auto components (lights, pumps, occupant comfort, stability
control, computer systems, electronic braking, drive by wire, audio and video systems, TE HVAC.)
Reduce size of alternator (target: 1/3rd reduction in size)
Improve fuel economy (targets: 5% to 6%)
Reduce Regulated Emissions and Greenhouse Gases
DOE’s First Generation Vehicular (TEG) Program Objectives
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Vehicle Technologies Program eere.energy.gov
Gasoline Engine Waste Heat
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Vehicle Technologies Program eere.energy.gov
Com
bust
ion 30%
Engine
Vehicle Operation10
0%
40% Exhaust
Gas
30%Coolant
5% Friction & Radiated
25Mobility &
AccessoriesGas
olin
e
Gas
olin
ega
solin
e
Typical Waste Heat from Gasoline Engine Mid Size Sedan
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Vehicle Technologies Program eere.energy.gov
Carbon PM HC Unburned Fuel, Lube Oil CO CO2
Gasoline C7H16
Diesel C18H30
Methanol CH3OH
Ethanol C2H5OH
Natural Gas (Primarily Methane, CH4)
Propane C3H8
Combustion of Hydrocarbon FuelsReleases Carbon
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Vehicle Technologies Program eere.energy.gov
Modular HVACVariable speed compressor more efficient and serviceable3X more reliable compressor no belts,
no valves, no hoses leak-proof refrigerant lines instant electric heat
StarterGenerator
MotorBeltless engine
product differentiation improve systems design flexibility more efficient & reliable accessories
Shore Powerand InverterSupplies DC Bus Voltage from 120/240 Vac 50/60 Hz Input Supplies 120 Vac outlets from battery or generator power
Down ConverterSupplies 12 V Battery from DC Bus
AuxiliaryPower Unit
Supplies DC Bus Voltage when engine is not
running - fulfills hotel loads without idling main engine
overnight
Compressed Air ModuleSupplies compressed air for brakes and ride control
Electric WaterPumpHigher reliability variable speed
faster warm-up less white smoke lower cold weather emissions
Electric Oil PumpVariable speed
Higher efficiency
TurbocompoundTruck
ElectrificationDemonstration
Beltless or More Electric Engine
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Vehicle Technologies Program eere.energy.gov
Vehicular Thermoelectric Applications
Air Conditioner / Heater (TE HVAC) Engine Waste Heat Generator (TEG) Pre-start Engine Oil and Transmission
Fluid warm up. Battery Thermal Management Beverage Cooler/Warmer Computer and Radar (Collision
Avoidance) Cooling
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Vehicle Technologies Program eere.energy.gov
1017 1018 1019 1020 1021
α σ
Carrier Concentration
Tota
l ΚZT
insu
lato
r
met
al
semiconductor
Unusual Combinationof Properties
σ 2
ZT =α
(κe + κL)• T
Seebeck coefficientor thermopower
(∆V/∆T)
Electrical conductivity
Total thermal conductivity
σ α2α
σ
κ
ZTmax
κL
κe
σα2 = Power Factor
σ= 1/ ρ = electrical conductivity
ρ = electrical resistivity
TE Materials Performance:Figure of Merit (ZT) [Oregon State]
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Vehicle Technologies Program eere.energy.gov
Nanoscale Effects for Thermoelectrics(courtesy Millie Dresselhaus, MIT)
PhononsΛ=10-100 nm
λ=1 nm
ElectronsΛ=10-100 nmλ=10-50 nm
Electron Phonon
Interfaces that Scatter Phonons but not Electrons
Mean Free Path Wavelength
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Vehicle Technologies Program eere.energy.gov
T (K)200 400 600 800 1000 1200 1400
ZT
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Bi2Te3
PbTe SiGe
Ba0.24Co4Sb12
Ba0.08Yb0.09Co4Sb12
Triple-filled
Yb0.12Co4Sb12
1. X. Shi, et al. Appl. Phys. Lett. 92, 182101 (2008)2. X. Shi, et al., submitted (2009)
• Ba0.08La0.05Yb0.04Co4Sb12.05ο Ba0.10La0.05Yb0.07Co4Sb12.16
Highest ZT Achieved with Triple-filledSkutterudites (GM and U of Michigan)
RxCoSb3
Atoms can be inserted into empty sites. Atoms can “rattle” in these sites – scatter phonons and lower the lattice thermal conductivity.
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Vehicle Technologies Program eere.energy.gov
Current TE Materials
P-type TE material N-type TE material
Ref: http://www.its.caltech.edu/~jsnyder/thermoelectrics/
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Vehicle Technologies Program eere.energy.gov
heat
heat heat
p-TAGS
p-CeFe3RuSb12
p-Bi2Te3
current
n-CoSb3
n-PbTe
n-Bi2Te3current
heat
heat heat
p-TAGS
p-CeFe3RuSb12
p-Bi2Te3
p-TAGS
p-CeFe3RuSb12
p-Bi2Te3
current
n-CoSb3
n-PbTe
n-Bi2Te3
n-CoSb3
n-PbTe
n-Bi2Te3current
Thermal Mismatch Stressesare Significantly Reduced
Segmented ThermoelectricCouple Configurations
conventional BSST “Y” configuration
p-CeFe3RuSb12
heat
heat
heat
p-TAGS
p-Bi2 Te3
n-CoSb3
n-PbTe
n-Bi2 Te3
current
p-CeFe3RuSb12
heat
heat
heat
p-TAGS
p-Bi2 Te3
n-CoSb3
n-PbTe
n-Bi2 Te3
current
heatheat
heatheat
heatheat
p-TAGS
p-Bi2 Te3
n-CoSb3
n-PbTe
n-Bi2 Te3
current
directions ofthermal stresses
Thermal Mismatch Stresses canSeparate Material Layers
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Vehicle Technologies Program eere.energy.gov
16
GM Prototype TEG Fabricationfor Chevy Suburban
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Vehicle Technologies Program eere.energy.gov
GM Prototype TEG Installationin a Chevy Suburban Chassis
Hot side heat exchanger
Cooling blocks
Exhaust gas inlet
TE Modules
Exhaust gas outlet Coolant
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Vehicle Technologies Program eere.energy.gov
BSST 2D to 3D TEG Design Iterationfor BMW and Ford Autos
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Vehicle Technologies Program eere.energy.gov
Amerigon/BSST TEG for Ford and BMW
Final assembly TEG prior to installation in BMW X6 and Ford Fusion
Cylindrical design TEG incorporates an internal bypass of exhaust gas for high engine load
The TEG has 3 sections with different TE materials matched to the decreasing thermal power in the exhaust gas as passes through the TEG.
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Vehicle Technologies Program eere.energy.gov
TEG Location on Ford Fusion:
Coolant Port
Inner pipe Ø50mm
Heat exchanger main pipe Ø90mm
Inner cone
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Vehicle Technologies Program eere.energy.gov
Amerigon/BSST TEG Installation in Vehicles
Amerigon and Faurecia are installing production prototype TEG’s in the exhaust systems of BMW X6 and Ford Fusion.
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Vehicle Technologies Program eere.energy.gov
-
BMW X-6
Prototype TEG’s In Ford Fusion, BMW X6 and Chevy Suburban- DOE Programs
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Vehicle Technologies Program eere.energy.gov
BMW Exhaust Gas Recirculation (EGR)Cooler-TEG on Diesel Engine
Source: BMW Group
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Vehicle Technologies Program eere.energy.gov
DOE’s Objectives: Second Generation Automotive TEG’s
Commercially Viable Thermoelectric Modules ZTavg = 1.6 Temperature range 350 - 900oK
Eliminate the Alternator Entirely
Provide a 10 Percent Reduction in On-Highway Fuel Use with Associated Reduction in Regulated Emissions and “Greenhouse Gases”
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Vehicle Technologies Program eere.energy.gov
DOE/CEC’s Automotive TE HVAC Program(Thermoelectric Heating Ventilation & Air Conditioning)
Competitive Awards to Teams Led by Ford and GM 09/09
Co-Funded with the California Energy Commission
Develop TE Zonal or Distributed Cooling/Heating Concept Maintain Occupant Comfort without Cooling Entire Cabin
Reduce Energy used for Automotive HVAC’s by >30%
Eliminate all Toxic, Greenhouse and Flammable Gases Associated with Automotive HVAC
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Vehicle Technologies Program eere.energy.gov
DOE/CEC Program Objectives:Ford & GM Vehicular TE HVAC Teams
Maintain Occupant Comfort while Reducing Fuel Consumption
Develop TE HVAC with:COP Cooling > 1.3COP Heating > 2.3
Integrate with Compressor Downsized by ~1/3 Develop Production Prototype Integrate, Test and Deliver TE HVAC in a
5 Passenger Vehicle
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Vehicle Technologies Program eere.energy.gov
25-50 miles of gas- and emission-free driving plus hundreds of miles of extended-range
driving
Electrically Assisted Vehicle 2011 Car of the Year
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Vehicle Technologies Program eere.energy.gov
Thermoelectric HVAC and Generators Improve the Volt’s Range and Fuel Economy
The Volt’s range is significantly reduced when providing thermal comfort to occupants under hot or cold weather conditions
Developing localized cooling and heating concept to directly cool and heat occupants instead of controlling
temperature of entire passenger cabin to downsize the A/C compressor and replace the resistive
heater with efficient thermoelectrics Investigating thermoelectric generator application where
unique On/Off operation of the Volt’s engine should accommodate a simplified system design
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Climate Control Seat™
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Vehicle Technologies Program eere.energy.gov
Vehicular Thermoelectric HVAC Zonal Concept
Energy Requirements (Analytical)
Zonal Concept cools/heats each occupant independently
• 680 Watts to cool single occupant
• Current A/C’s 3500 to 4500 Watts cool entire cabin
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Concept of Zonal Thermoelectric Air Conditioner/Heater (HVAC)
Zonal TE units located in dashboard, headliner,A&B pillars and seats / seatbacks
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Vehicle Technologies Program eere.energy.gov
NREL’s Support of Ford’s Team TE HVAC Zonal Occupant Comfort Development:
Test and Evaluate Candidate Zonal TE HVAC systems
Analysis and Design Optimization
National Renewable Energy Laboratory Innovation for Our Energy Future32
NREL’s Thermal Manikin (ADAM)
NREL’s Human Physiological Model
ThermoAnalytics Physiological Model
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Vehicle Technologies Program eere.energy.gov
Battery Temperature Impacts PHEV, HEV and EV Performance and Service Life
Battery temperature impacts vehicle performance, reliability, safety, and life cycle cost
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Vehicle Technologies Program eere.energy.gov
TEG Trickle Charge Battery: Sea Water--Ambient Air 24/7 Underway: Engine Exhaust--Sea Water
Keel Coolers
Seawater Cooled Exhaust
Stack TE Generator
Engine
Maine Maritime Academy
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Vehicle Technologies Program eere.energy.gov
Vehicular Thermoelectric Hybrid ElectricPowertrain Replacing the ICE
440V
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Vehicle Technologies Program eere.energy.gov
Market Factors Involving Thermoelectrics for Automotive Applications
Dramatic Increase in Demand for Large Quantity Thermoelectric Materials
Historically Semiconductor Costs Decrease with Volume Thermoelectrics Should Follow this Trend
Automotive Industry Continually Wants “New and Improved” Technology
Ever Increasing Gasoline/Diesel Prices
Fuel Economy Requirements and Emissions Regulations
Should Stimulate Waste Heat Energy Harvesting Applications