**5. Conclusion**

In this chapter, the latest progress on TEG exhaust heat recovery is introduced. The technology is still the favourite solution for lightweight vehicles until final phase-out of fuel-powered combustion engine in the middle of the twenty-first century. It is worth mentioning that automotive engineering is a process of system engineering, all the potential applicable technology should be evaluated in the context of specific vehicle platform. There is no exception for the TEG technology. Due to the nature of internal combustion engine, the heat source varies from exhaust temperature, torque load and even climate condition. The energy demands in passenger car is very different with heavy-duty truck in respect of fuel economy. To help the decision making of go/no-go in automotive, further material researches on higher power density and economic TE material are necessary. For TEG heat recovery system, heat exchanger designers should focus on the heat enhancement to match the heat flux through TE materials.

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