Electrical Modelling and Mismatch Effects of Thermoelectric Modules on Performance of a Thermoelectric Generator for Energy Recovery in Diesel Exhaust Systems

Ezzitouni, Samir; Fernández-Yáñez, Pablo; Rodríguez, Luis Sánchez; Armas, Octavio; Morenas, Javier de las; Massaguer, E.; Massaguer, A.

doi:10.3390/en14113189

Cited by 12 publications

(7 citation statements)

References 39 publications

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“…The electrical simulation mismatch of thermoelectric modules has a great influence on the energy recovery of the diesel exhaust system. The temperature and voltage difference of each module will reduce the power generation performance of TEG and also weaken the transient response characteristics of the waste heat recovery system . Therefore, Luo et al first proposed the numerical model of transient fluid–thermoelectric multiphysical field coupling thermoelectric converter, pointing out that the changes of output voltage and output power are often accompanied by the changes of exhaust mass flow rate and there are also some phenomena such as output response lag.…”

Section: Application Of Exhaust Energy Recovery Technology At Variabl...mentioning

confidence: 99%

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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The increase in altitude causes the decrease in internal combustion engine power and the increase in pollutant emission. Converting waste heat into more useful forms of energy through the recovery of waste heat from internal combustion engines is the most promising mechanism for improving both of these goals. This paper comprehensively reviews the development and research of waste heat recovery technology of an internal combustion engine in a variable altitude environment. It is found that exhaust gas turbocharging is the most promising waste heat recovery technology to restore high-altitude internal combustion engine power. Turbochargers are affected by low temperature and low pressure at high altitudes, resulting in poor environmental adaptability, inadequate supercharging ratios, and decreased supercharging efficiency. Therefore, it is very important to select the high pressurization system facing the plateau area and its reasonable matching characteristics. The quality of exhaust energy determines how much waste heat a turbine can recover, and only the exergy part of exhaust energy can realize heat/work conversion. The main disadvantage of turbocharging technology applied in the plateau area is that the speed ratio deviates from the design value, leading to the increase of flow loss inside the supercharger. Therefore, optimizing the internal flow field of a high-altitude supercharger is a key problem to improve the efficiency of energy recovery. The conclusion drawn from this Review is that a two-stage turbocharging system will be a key technology to improve the thermal efficiency and reduce the fuel consumption of high-altitude internal combustion engines in the coming decades. In addition, the efficient utilization of the exhaust energy of the two-stage turbine and the influence of the variable compression process of the two-stage compressor on the working medium in the cylinder will be the focus of future research.

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Section: Application Of Exhaust Energy Recovery Technology At Variabl...mentioning

confidence: 99%

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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“…This new concept could be particularly useful for aircraft piston engines since it saves weight and volume. In addition, this type of TEG has a more even temperature distribution, helping to reduce the electrical mismatch effects [23]. Usually, TEGs require a cross-sectional area expansion in order to have enough surface to place the thermoelectric modules.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Thermoelectric Generators for Waste Energy Recovery in Piston Engines

Fernández-Yáñez,

Jarama,

Martos

et al. 2023

Applied Sciences

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This paper investigates the design of a thermoelectric generator for exhaust gases from internal combustion engines. Experimentally validated CFD methodology was employed. Different issues are studied, such as the influence of the replacement of the exhaust pipe for the TEG, the recirculation produced, and the influence of fins. The results show that an enlarged inlet cone reduces the recirculation and the pressure drop of the TEG, but more heat is lost across the cone walls, reducing the heat available for the thermoelectric modules. Internal straight fins aligned with the flow achieved a 3% increase in heat transfer, did not significantly increase the pressure drop in this type of device, and reduced the effects on pressure of the recirculation, lowering the overall pressure drop by 10%. An energy production of 175.9 W with 16.2 W of pressure drop power losses resulted in a net energy production of 160.7 W. A comparison with a flat-type thermoelectric generator under the same hot source conditions is also provided.

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“…In addition, they reported that the accuracy of the simulated output power was over 97%, and the waste heat recovery potential of hybrid vehicles was approximately 1.8 times higher than that of conventional vehicles [29]. Simulation scenarios considering the real operating conditions of light vehicles by Ezzitouni et al [30] allowed for a significant negative impact of thermoelectric module interconnection on electrical energy production under heterogeneous thermal surface conditions. Simulations performed by Heber et al [31] using commercial thermoelectric module simulations showed better results.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Ship Exhaust Gas Temperature Differential Power Generation

et al. 2022

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In addition to the use of waste heat from the vessel’s exhaust gas to save energy onboard, reduce the carbon emissions of the ship, and combine the characteristics of ship waste heat, mathematical modeling and testing of ship waste heat temperature difference power generation were carried out in this study. Finally, an experimental platform for temperature differential power generation was established to assess the impact of influencing agents on the efficiency of temperature differential power generation. The results show that the effect of different thermally conductive greases on the efficiency of temperature differential power generation tablets is basically the same. In addition, the rate of flow of cooling water, the cooling plate area, and the heat source temperature have more significant effects on the open-circuit voltage and maximum output power. The results show that the maximum power output growth rate increases with increasing cooling water flow, reaching 8.26% at 4 L/min. Likewise, increasing the heat source temperature enhances the maximum output power growth rate by 15.25% at 220 °C. Conversely, the maximum output power of the temperature difference power generation device decreases as the cooling plate area increases, and the maximum output power reduction rate is 15.25% when the cooling plate area is 80 × 200 mm2 compared to the case of using a cooling plate area of 80 × 80 mm2. Moreover, the maximum output power of the temperature differential power generation device reaches 13.6 W under optimal conditions. Assuming that the temperature difference power generation plate is evenly distributed on the tailpipe of the 6260ZCD marine booster diesel engine, it could save approximately 5.44 kW·h electric power per hour and achieve a reduction in CO2 emissions of 0.3435 kg per hour.

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Electrical Modelling and Mismatch Effects of Thermoelectric Modules on Performance of a Thermoelectric Generator for Energy Recovery in Diesel Exhaust Systems

Cited by 12 publications

References 39 publications

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

Heat Transfer in Thermoelectric Generators for Waste Energy Recovery in Piston Engines

Performance Analysis of Ship Exhaust Gas Temperature Differential Power Generation

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