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TE system efficiency, ηTE sys, and TE system maximum power output rating, Pmax, TE sys, are both treated as constant parameters for a given design. Figure 1. Conversion efficiency of a thermoelectric device vs. figure of merit, ZT 2.2 Vehicle Model The vehicle model consists of simple road load, engine waste heat, and driveline models. A schematic of the model, including the TE system, is given in Figure 2. Only a small portion of the vehicle’s fuel input energy is converted to useful work to drive the wheels and accessory loads. In a conventional vehicle, fuel may be saved by reducing the mechanical accessory load on the engine, Pacc, mech, and using power generated by the TE system to drive some or all accessories with electricity, Pacc, elec, instead. The power required at the wheels to drive the vehicle at speed, v, is Fareo = 12 ρairCd Af v2 , Froll =mgcos(θ)a. The power at the wheels is met by engine power, Peng, transferred to the wheels through a driveline with efficiency, ηdrv, = 85%: P =(P −P )η . wheels eng acc, mech drv In addition to meeting road loads, the engine must also drive accessories consuming power, Pacc mech. Engine power is calculated as dv P =vF +F +m , wheels aero roll dt where the aerodynamic drag and rolling resistance forces are, respectively, 3PDF Image | Feasibility of Thermoelectrics for Waste Heat Recovery in Conventional Vehicles
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