Thermoelectric Energy Harvesting for Exhaust Waste Heat Recovery: A System Design

Area of Science:

• Energy Harvesting
• Thermoelectric Technology
• Heat Transfer

Background:

• Thermoelectric (TE) technology offers a sustainable energy source for high-speed moving objects by utilizing temperature gradients.
• Current research in integrated thermoelectric generator (TEG) systems lags behind materials development.
• Efficient energy harvesting is crucial for enhancing the operational capabilities and endurance of mobile platforms.

Purpose of the Study:

• To design and experimentally validate an integrated TEG system for thermal energy recovery from exhaust gas.
• To optimize heatsink design for maximizing temperature gradients and electrical output power in moving systems.
• To demonstrate the feasibility of the TEG system under high-speed vehicle conditions.

Main Methods:

• Development of a proof-of-concept platform simulating an exhaust gas emission system.
• Design of triangular plate-fin heat exchangers for heat collection and longitudinal trapezoidal fin heatsinks for heat dissipation.
• Optimization of heatsink design using finite element analysis (FEA) simulations.
• Experimental testing of the TEG system with commercial bismuth telluride modules.

Main Results:

• Achieved a maximum system output power of 40 W under a temperature gradient (ΔT) of 190 °C.
• Demonstrated effective heat collection from simulated exhaust gas and heat dissipation via forced convection.
• Computational simulations confirmed system feasibility under high-speed moving vehicle conditions.

Conclusions:

• The developed TEG system design effectively bridges the gap between TE devices and integrated systems.
• This advanced TEG system represents a significant advancement for powering high-speed moving objects.
• The technology holds potential for applications such as autonomous and longer-lasting aerial platforms.