Car exhaust waste heat recovery using hexagon shaped thermoelectric generator

Muhammad Fairuz Remeli, ,Baljit Singh

doi:10.24191/jaeds.v1i1.25

Abstract

Heat recovery technology using thermoelectric has attracted many research intentions mainly for its ability to generate power passively. The automotive engine usually produces waste heat ranging from 30-40% due to the thermodynamic limit. The use of thermoelectric generator (TEG) for waste heat recovery and power generation could increase the efficiency of the internal combustion engine system. This research developed and investigated a heat recovery system using a thermoelectric generator (TEG) for power generation. A thermoelectric generator (TEG) consisted of thermoelectric modules, hexagonal pipe connector and heat sinks was built and connected to an exhaust pipeline. A theoretical model was developed to access the thermal and electrical performance of the TEG system. The theoretical model consisted of the heat transfer mechanism including the thermal resistance networks from the flue gas to TEG and the heat sink. The electrical power output was determined using the Seebeck principle. The early stage of finding reveals that the system was able to produce an open circuit voltage of 0.13 V for a small temperature gradient of 3ᵒC between the cold and hot surface of the TEG. The further improvement of the system is currently under investigation for producing higher power. In the future, this system hopefully could replace the car battery for charging the alternator as well as increasing the overall efficiency of the engine system.

Highlights

1.0 INTRODUCTION The limitation of an internal combustion engine (ICE) is that only 30% of the fuel combustion is converted into mechanical energy
4.0 CONCLUSION This study presents a unique hexagonal-shaped thermoelectric generator (TEG) generator that is connected to an exhaust pipe of a car engine
The generator is able to accommodate a maximum of 6 pieces of thermoelectric cells (TECs) on the hexagonal adaptor of the exhaust pipe

Summary

Introduction

The limitation of an internal combustion engine (ICE) is that only 30% of the fuel combustion is converted into mechanical energy. An exhaust heat recovery system is needed to extract the waste heat and converting it into electricity. Most of the current engine heat recovery system involves an active system that requires rotating part including a small turbine in an organic Rankine cycle and turbocharger technology. These types of systems are expensive and not maintenance-free. Another promising technology to replace this system is thermoelectric. Thermoelectric technology is a passive heat transfer device (non-moving) that can directly convert the wasted thermal energy into electricity without using any moving parts [4,5]

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Methods

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Conclusion