Automotive Thermoelectric Generators and HVAC
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1 Automotive Thermoelectric Generators and HVAC John Fairbanks Solid State Energy Conversion Advanced Combustion Engine R&D Program Vehicle Technologies Office 2013 Annual Merit Review and Peer Evaluation Meeting DOE Vehicle Technologies Office Washington, DC May 17, 2013 ACE00E
2 Vehicular Engine Waste Heat Energy Opportunity for improving fuel economy arises from high temperature of vehicle exhaust systems: converting heat to electricity reduces load on engine (electricity powers components; smaller alternator needed) 2
3 Vehicular Engine Waste Heat Energy Recovery Goal: integrate vehicles with a technology that will improve fuel economy Approach: use thermoelectrics to convert energy in hot engine exhaust directly to electricity Target: > 5% improvement in fuel economy; achieved by using output of TEG to power key electrical components 3
4 Fuel economy is improved when belt-driven accessories are replaced with electric motor drives powered by Thermoelectrics Modular HVAC Starter Generator Motor Auxiliary Power Unit Shore Power and Inverter Supplies DC Bus Voltage from 120/240 Vac 50/60 Hz Input Supplies 120 Vac outlets from battery or generator power Down Converter Supplies 12 V Battery from DC Bus Compressed Air Module Electric Water Pump Toward the beltless engine Electric Oil Pump 4
5 Experimental Assessment of Potential of TEG to Improve Fuel Economy (GMZ Energy) Up 3.45% Fuel Economy Improvement potential with alternator removal in 2.0L Engine 1 *Fuel economy improvements tested with no back pressure or weight considerations of a thermoelectric generator over US06 Cycle for Chevy HHR Constant Supplemental Power to Engine (W) Fuel Economy gain [%] * 1+ Fuel economy improvements tested with no alternator attached to engine. All power supplied to HHR by external power supply. Tested over US06 Cycle Supplemental Power to Engine (W) Fuel Economy gain [%] Supplemental Power As needed to Engine (W) Off cycle credit granted of 2.9% *4 and HWFET Cycle Fuel Economy Gain of 4.07% + Credit granted by 132W power generation :0.5% *2*3 Credit granted by quick engine warm up:0.9% *3*4 Credit granted by quick transmission warm up using exhaust heat:0.9% *3*4 Credit granted by installation of device encouraging cabin heating to vehicle having idle start/stop function :0.6% *3*4 *2 Power Generation based on average output power of TEG over 5 cycle *3 Credits based on fuel economy regulations of 2025 *4 2.9% Fuel economy improvement based on a cold start from Cold FTP Cycle Fuel consumption [mpg] Delta to baseline [%] Baseline, 0 W TEG, max. 330 W TEG, max. 480 W Test Setup + Fuel economy improvements tested with no back pressure or weight considerations of a thermoelectric generator 5
![Economy gain [%] 480 + 2.94* 1+ Fuel economy improvements tested with no alternator attached to engine. All power supplied to HHR by external power supply.](/docs-images/40/13881232/images/page_5.jpg "Tested over US06 Cycle Supplemental Power to Engine (W) Fuel Economy gain [%] Supplemental Power As needed + 3.45 + to Engine (W) Off cycle credit granted of 2.")
6 6 Car and Driver Most Promising Technology, January 2012
7 The power of increasing fuel economy by 1% and 5% Segment Type of Savings Estimated Fuel Savings over 1 Year (Billion nominal US Dollars) Auto/Light-duty trucks Personal 1% Fuel Savings $5.0 B Heavy-duty trucks Auto/Light-duty trucks Heavy-duty trucks Commercial 1% Fuel Savings $1.4 B Personal 5% Fuel Savings $25 B Commercial 5% Fuel Savings $6.9B Reference: Davis (2012), Transportation Energy Data Book, Table EIA (2013), Gasoline and Diesel Fuel Update ( accessed March 2013) 7
8 TEG contribution to Future CAFE White House announced an agreement with 13 major automakers to achieve 54.5 mpg by 2025 Recovering engine exhaust waste heat using thermoelectric generators (TEGs) is consistent with this objective 8
9 World Wide Funding of Thermoelectrics compiled by Gentherm (J. LaGrandeur) Global Investment in TE Technology- November 2012 Snapshot (~ 4 yr bucket) GM Ford BMW Honda Daimler Benz Volkswagon Fiat/Chrysler Renault Toyota Region Total Spent, USD Total Government funds, USD EU $ 145,732,370 $ 97,336,809 North America $ 53,923,077 $ 37,250,000 Russia $ 40,000,000 $ 20,000,000 Japan $ 22,600,000 $ 21,700,000 China $ 15,100,000 $ 15,100,000 Worldwide Total $ 277,355,447 $ 191,386,809 9
10 Thermoelectric Funding Partners California Energy Commission U.S. Army Tank, Automotive, Research, Tank Development and Engineering Center (TARDEC) National Science Foundation Program of R&D with Industrial and Academic Partners Lead Industrial Organizations: Ford, GM, GenTherm, GMZ Energy, BMW Lead Academic Organizations: Ohio State, Purdue, Stanford, SUNY-Stony Brook, TAMU, UCLA, UT-Austin, VT 10
11 R&D Project Presentations Lead Industrial Organizations (reviewed) Ford, GM, GenTherm, GMZ Energy, BWM Ford: Thermoelectric HVAC and Thermal Comfort Enablers for Light-Duty Vehicle Applications, Clay Maranville GM: Energy Efficient HVAC Systems for Distributed Cooling/Heating with Thermoelectric Devices, Jeffrey Bozeman GenTherm: Thermoelectric Waste Heat Recovery Program for Passenger Vehicles, Doug Crane GM: Cost-Competitive Advanced Thermoelectric Generators for Direct Conversion of Vehicle Waste Heat into Useful Electrical Power, Jim Salvadore GMZ: Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion for Efficient Automotive Waste Heat Recovery, Jonathan D Angelo Lead Academic Organizations: (not reviewed) Ohio State, Purdue, Stanford, SUNY-Stony Brook, TAMU, UCLA, UT-Austin, VT Stanford: Automotive Thermoelectric Modules with Scalable Thermo and Electrical-Mechanical Interfaces, Kenneth Goodson Ohio State University: SEEBECK Saving Energy Effectively by Engaging in Collaborative Research and Sharing Knowledge, Joseph Heremans 11
12 Thermoelectric Power Generation BMW s and VTO s Projections for BMW Sedans Average demand for electric power. 390 W 4% 750 W 6% 400W 4% 1000 W 8% 330 W 3,5% 190 W 2% NEDC customer NEDC Customer NEDC customer Source: BMW Group 116i 530dA 750iA 12
13 Vehicle Integration with Thermoelectics: FORD, GM and BMW Prototype integration pursued under DOE/industry sponsorship Ford Lincoln MKT Chevy Suburban - BMW X6 13
14 GM TEG Design and Performance with Gen 2 Skutterudite Modules 10% conversion efficiency with T=450K. 14
15 GenTherm/Ford/BMW/Faurecia Cylindrical TEG Cylindrical TEG design well suited for exhaust system 15
16 16 TEG Installation in BMW X6
17 NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications ( ) Research in academia pursued under 2010 Solicitation NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications (see NSF ) Vehicle Technologies Office (EERE) Thermal Transport Processes Program (Engineering Directorate) 17
18 Much of effort directed toward material development ( ZT ) HVAC Power Generation η = T H T C T H 1+ ZT 1 1+ ZT + T C TH ZT = σ 2 α (κ e + κ L ) T 18
19 Wiedemann-Franz Law κ 19
20 NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications ( ) Areas Targeted Funding: $9M over three years ($4.5M from DOE; $4.5M from NSF) 20
21 NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications ( ) Funded projects (2010) Virginia Tech: An integrated approach towards efficient, scalable, and low cost thermoelectric waste heat recovery devices for vehicle. Scott T Huxtable Stanford: Automotive Thermoelectric Modules with Scalable Thermo- and Electro-Mechanical Interfaces. Kenneth E Goodson UT-Austin: High-Performance Thermoelectric Devices Based on Abundant Silicide Materials for Waste Heat Recovery. Li Shi Texas A&M U.: Inorganic-Organic Hybrid Thermoelectrics. Sreeram Vaddiraju UCLA: Integration of Advanced Materials, Interfaces, and Heat Transfer Augmentation Methods for Affordable and Durable Devices. Yongho Ju UC-Santa Cruz: High Performance Thermoelectric Waste Heat Recovery System Based on Zintl Phase Materials with Embedded Nanoparticles. Ali Shakouri Ohio State: Project SEEBECK-Shaving Energy Effectively by Engaging in Collaborative research and sharing Knowledge. Joseph Heremans Purdue: Thermoelectrics for Automotive Waste Heat Recovery. Xianfan Xu SUNY-Stony Brook: Integrated Design and Manufacturing of Cost Effective and Industrial-Scalable TEG for Vehicle Applications. Lei Zuo 21
22 NSF/DOE Partnership Thermoelectric: Stanford, U of South Florida) Title of project: Automotive Thermoelectric Modules with Scalable Thermo- and Electro-Mechanical Interfaces Academic PIs: K.E. Goodson (Stanford University), G. Nolas (University of South Florida) Industrial Collaborator: B. Kozinsky (Robert Bosch LLC) thermal interface materials carbon nanotube and metal nanowire arrays Nanostructured thermal interfaces Metal Nanowires skutterudites and half-heusler alloys Carbon Nanotubes 2 μm T h = K Ceramic plate Concepts developed to be used by Robert Bosch LLC. 150 μm High-temperature skutterudite (Ba,Yb,Co,Sb Re structures) Connecting metal n-type Pellet p-type Pellet Heat Sink High-temperature Infrared microscopy 500 μm 22 22
23 NSF/DOE Partnership Thermoelectrics: Virginia Tech Title of project: An integrated approach towards efficient, scalable, and low cost thermoelectric waste heat recovery devices for vehicles Academic PIs: Scott T. Huxtable, Srinath V. Ekkad, and Shashank Priya, Virginia Tech Industrial Collaborator: Andrew Miner, Romny Scientific, San Bruno, CA Developed n-type MgSi based alloy (ZT 450C) with a new mechanical alloying process that is rapid, repeatable, and scalable to high volume production ZT Two Tier 1 automotive suppliers to use these materials for TEGs temperature 23
24 NSF/DOE Partnership Thermoelectrics : U of Texas, U of Wisconsin Title of project: High-Performance Thermoelectric Devices Based on Abundant Silicide Materials for Vehicle Waste Heat Recovery Academic PIs: Li Shi, John B. Goodenough, Matt J. Hall, Jianshi Zhou (U. of Texas at Austin); Song Jin (U. of Wisconsin Madison) scalable method of synthesizing Mg 2 Si- Mg 2 Sn-Mg 2 Ge ternary solid solutions with ZT 1.08 at 800 K for Sb-doped Mg 2 Si 0.4 Sn 0.4 Ge 0.2 system level finite different model for a thermoelectric heat exchanger. A TEG module made of Mg 2 Si based material as a n-type leg (left) and HMS based material as a p-type leg (right). 24
25 NSF/DOE Partnership Thermoelectric: Purdue/UC Santa Cruz Title of project: High performance TE system based on Zintl phase materials with embedded nanoparticles Academic PIs: A. Shakouri (Purdue); Z. Bian (UC Santa Cruz); S. M. Kauzlarich (UC Davis) Industrial partners: NASA JPL scalable synthetic method to produce Mg 2 Si nanocomposites - ZT ~ 0.7 at 500 C - by reducing thermal conductivity. JPL/NASA collaborations/characterization Thermal conductivity Mg 2 Si/nanoparticles(NPs) NPs Tani & Kido, Physica B 364: 218. Bux et al, J. Mater. Chem. 21: Mg 2 Si e 25
26 NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications ( ) Title of project: Integration of Advanced Materials and Interfaces for Durable Thermoelectric Automobile Exhaust Waste Heat Harvesting Devices Academic PIs: Y. Sungtaek Ju and Bruce Dunn (UCLA) Industrial Collaborators: JPL metal matrix nano-composites with tailorable CTEs for electrodes and contact materials in TEG modules. Technology developed will be used by thermoelectric module manufacturers 26
27 NSF/DOE Partnership on Thermoelectric Devices for Vehicle Applications ( ) Title of project: Purdue GM Partnership on Thermoelectrics for Automotive Waste Heat Recovery Academic PIs: Xianfan Xu, Timothy S. Fisher, Steven D. Heister, Yue Wu, Timothy D. Sands, Purdue University Industrial Collaborators: Gregory Meisner, James Salvador, General Motors R&D novel hot side (proprietary) heat exchanger with high heat transfer coefficient and low pressure loss GM to implement design Hot side heat exchanger (conceptual drawing; details removed) 27
28 The Way Forward Large volume/commercially viable production Improve thermoelectric materials and TEG efficiency Prototype evaluation in vehicles 28
29 Questions? THERMOELECTRICS: THE NEW GREEN AUTOMOTIVE TECHNOLOGY 29
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