Waste heat recovery from thermo-electric generators (TEGs)

Hewawasam, L.S.; Jayasena, A.S.; Afnan, M.M.M.; Ranasinghe, Chathura; Wijewardane, M.A.

doi:10.1016/j.egyr.2019.11.105

Cited by 63 publications

(26 citation statements)

References 6 publications

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“…Furthermore, thermoelectric elements are widely utilized as electric-cooling units in portable refrigerators and high-performance optical sensors. Research on large-scale energy recovery from internal combustion engines has also been extensively performed, and there has been a significant improvement in the thermoelectric elements to increase the energy conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivities and Figures of Merit of Tetracyanoquinodimethane-Based Thermoelectric Materials Consisting of Cations Exhibiting Order–Disorder Transitions

Hoshino

Akutagawa

2022

Crystal Growth & Design

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A reduction in thermal conductivity is a common challenge in the development of thermoelectric materials. The thermal conductivity of molecule-based crystals can be reduced by vibrating or disordered counter ions that scatter the heattransporting phonons. In this work, the thermoelectric properties of five 1:2 salts of tetracyanoquinodimethane (TCNQ) were examined to study the effect of counter ions on the order−disorder transitions in thermal conductivity and on the thermoelectric figure of merit. The tetraethylammonium (TEA + ) and dipropylammonium (DPA + ) salts of TCNQ 0.5− , which undergo the order− disorder transitions above 200 K, exhibited significantly low thermal conductivities compared to the quinolinium (Q + ) salt, which does not undergo any order−disorder transition. Methyltriphenylphosphonium (MTPP + ) and methyltriphenylarsenium (MTPAs + ) salts also showed lower thermal conductivities than the Q + salt, presumably because of the heavy P and As atoms. Despite the wide variation in thermal conductivities, the product of the phonon velocity v and mean free path l was minimized at similar temperatures, presumably because of the common vibronic property exhibited by the TCNQ 0.5− stacks. A comparison between the power factors P max and zT revealed the improvement of the conversion efficiency by the vibrating counter cations. The P max value for the DPA + salt was approximately 23 times smaller than that for Q + ; however, the thermal conductivity of the DPA + salt in the disordered phase was approximately a quarter that of Q + , and the zT value for DPA + remained 7 times smaller than that for Q + .

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivities and Figures of Merit of Tetracyanoquinodimethane-Based Thermoelectric Materials Consisting of Cations Exhibiting Order–Disorder Transitions

Hoshino

Akutagawa

2022

Crystal Growth & Design

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“…And the inefficiency of energy consumption has become a huge cost leak. Therefore, planning and optimizing energy consumption are important for the sustainability of the business and the environment as they effectively reduce energy costs as well as take care of the environment at the same time [2]. Thermoelectric generators (TEG) are solid-state semiconductor devices that convert temperature difference and heat flow into a useful DC power source by utilizing the Seebeck effect to generate voltage to drive electrical current and produces useful power at a load IOP Publishing doi:10.1088/1742-6596/2261/1/012007 2 [3].…”

Section: Introductionmentioning

confidence: 99%

Designing MPC Controller for a Heat Exchanger Equipped with Thermoelectric Generators

Kemjariya

Daosud²,

Weerachaipichasgul³

et al. 2022

J. Phys.: Conf. Ser.

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A thermoelectric generator (TEG) is a solid-state semiconductor device that can convert temperature differences and heat flow into electrical energy. Nowadays, industries with high-temperature production processes tend to experience unavoidable heat loss. Heat exchangers are therefore the most widely used equipment to recover these waste heat. The researcher therefore saw the benefits of bringing TEG devices to be installed in heat exchangers. It is thought that in addition to the heat exchanger being a device that helps the heat transfer of one fluid to another fluid. Can also generate electricity back to use as well. This will be of great benefit in increasing the efficiency of waste heat recovery and reducing production costs. In this research, 36 plates of Bismuth Telluride (Bi2Te3) TEG devices were installed in plate and fin heat exchangers and studied the effect of changes in the inlet flow rate of cold water at 20 °C on the effect of heat exchange and the electrical power produced by TEG. The hot water inlet flow rate was constant at 1 l/min and the temperature was constant at 85 °C. Then mathematical model was created to predict the results of the outlet hot water temperature, outlet cold water temperature, current and voltage produced. The model can predict accurately the least squares value (R2) with values of 0.949, 0.859, 0.707 and 0.749, respectively. In addition, a multiple input, multiple output (MIMO) using model predictive controller (MPC) was designed to control the output current, and temperature can control into the setpoint effectively.

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“…A muffler for duct noise reduction is integrated with a thermoelectric generator (TEG) in an exhaust system for vehicle waste heat recovery and power generation used to open and close an active valve. [1][2][3][4] In general, the efficiency of a TEG is proportional to the difference between the temperatures inside and outside the muffler, 1 and the noise attenuation performance of a muffler is strongly affected by the partition layout inside the muffler. 5 A fluid with high thermal energy enters the muffler and exits from it with a relatively low temperature.…”

Section: Introductionmentioning

confidence: 99%

Partition layout inside a muffler integrated with a thermoelectric generator: Multi-physics analysis and optimal design

Lee

2022

Journal of Low Frequency Noise, Vibration and Active Control

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A multi-physics-analysis-based topology optimization (TO) method is proposed to optimally design the internal partition layout of a muffler integrated with a thermoelectric generator (TEG). The basic equations governing the acoustical behavior, heat transfer, and fluid flow in the muffler are introduced, and their interaction is designated for exact numerical analysis in terms of acoustics, heat transfer, and fluid mechanics. To implement density-based TO, one design variable is assigned to each finite element in the design domain, and interpolation functions suitable for each physics phenomenon are employed. In the TO problem formulation, the sum of the squared acoustic pressures at the outlet of the muffler for multi-target frequencies is selected as an objective function to achieve broadband noise attenuation. The temperature of the TEG and the pressure drop are constrained for high energy recovery efficiency and fluid passage, respectively. The optimization problem formulated for the muffler design is solved for various design conditions. Optimal partition layouts are obtained depending on the location and length of the TEG, the upper limit value of the pressure drop, and the number of target frequencies in the same frequency band. The noise attenuation performances of each partition layout are compared, and their expected recovery energies are calculated. One optimal partition layout is discussed in terms of acoustics, heat transfer, and fluid mechanics. The numerical results strongly support the validity of our proposed method for the optimal design of a muffler integrated with a TEG.

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Waste heat recovery from thermo-electric generators (TEGs)

Cited by 63 publications

References 6 publications

Thermal Conductivities and Figures of Merit of Tetracyanoquinodimethane-Based Thermoelectric Materials Consisting of Cations Exhibiting Order–Disorder Transitions

Thermal Conductivities and Figures of Merit of Tetracyanoquinodimethane-Based Thermoelectric Materials Consisting of Cations Exhibiting Order–Disorder Transitions

Designing MPC Controller for a Heat Exchanger Equipped with Thermoelectric Generators

Partition layout inside a muffler integrated with a thermoelectric generator: Multi-physics analysis and optimal design

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