Concept of the system architecture: series simulations including a TEG module analysis, design of fin configurations, and distribution of thermal field investigated to test and to verify the simulation and experiment results.
Network of thermal resistors with a pair of TEG models.
Power output vs applied pressure (0.105, 0.209, and ) and load resistance at a fixed temperature difference ( or 303 K at the cold side).
For comparison with the theoretical value, the power output of a TEG module is studied with varied temperature differences and pressures of 0.105, 0.209, and .
Simulation of the system to recover waste heat: (a) CSHE (heat sinks) with 10, 22, and 44 fins, (b) HSHE with and without a fin structure, (c) prototype of the system, including fans, CSHE (heat sinks), HSHE (exhaust pipe), internal flow (exhaust gas), and TEG modules.
Average temperature of the exhaust gas in the outlet of exhaust pipe measured with varied engine rate.
Simulation results: (a) steady-state power output with varied external flow speed (fan flow rate) and compared with heat-sink configurations. [(b) and (c)] Average junction temperatures of front and back sections as a function of number of fins.
Scheme of waste heat harvesting system. (a) A fin-structured HSHE. (b) A frame of TEG modules mounted on the HSHE. (c) Cooling system anchored on the frame to dissipate heat of the cold side of TEG module. (d) Total view of the waste heat harvesting system.
Output power of both simulations and measurements with engine rate from 1000 to 3500 rpm.
Impedance-matching measurement recorded on varying the external load from 1 to . The maximal power was generated in a range of external load of .
Material properties at 300 K used in simulation.
Boundary conditions in these series simulations.
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