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Feasibility of Thermoelectrics for Waste Heat Recovery in Conventional Vehicles

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Feasibility of Thermoelectrics for Waste Heat Recovery in Conventional Vehicles ( feasibility-thermoelectrics-waste-heat-recovery-conventional )

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List of Figures 1. Conversion efficiency of a thermoelectric device vs. figure of merit, ZT ...........................3 2. Schematic of vehicle system model .....................................................................................4 3. Data from a caterpillar C12 engine (overlay), shown in comparison to results of the exhaust waste heat model.....................................................................................................4 4. Fuel savings under scenarios in which some or all of the engine’s mechanically driven accessories are replaced with electrically driven accessories ..............................................6 5. TE system cost and mass required to achieve 3-year economic payback (i.e., recovering TE system initial cost through fuels savings) ......................................................................7 6. Speed-versus-time traces for various driving cycles ...........................................................9 7. Fraction of time spent above a given speed for various driving cycles ...............................8 8. Percentage of time that a Class 8 truck spends above various levels of engine power for various driving cycles...................................................................................................14 9. Contour lines showing average electrical power, Pelec, avg (kW), generated by a TE System with conversion efficiency, η TE sys., = 10% for a Class 8 truck ............................15 List of Tables 1. Parameters for Four Vehicle Platforms in the Study ...........................................................5 2. TE System Conversion Efficiencies Required to Eliminate the Alternator (Scenario 1) and Electrify All Accessories (Scenario 2) for 20-mph Steady-State Driving ....................8 3. Average TE System Electrical Power for a Class 8 Truck under Different Driving Scenarios and TE System Conversion Efficiencies...........................................................12 4. Feasible Accessory Electrification Scenarios for a Class 8 Truck Incorporating TE Systems with Various Conversion Efficiencies.................................................................13 vi

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