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Characterization of a Thermoelectric Energy Recovery System Applied To Low Displacement Diesel Engines


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DOI: https://doi.org/10.15866/iree.v15i5.18708

Abstract


In this study, the performance of an applied TEG for the recovery of residual heat from the low displacement engine diesel engine exhaust gases has been evaluated. Twenty thermoelectric modules located on the upper and lower surface of a rectangular duct heat exchanger have been used in a 2×5 arrangement. By means of a cooling system formed by two rectangular coolers, the temperature of the cold surface of the TEMs remains constant. The diesel engine has worked a total of nine operating conditions, in which the rotation speed has been varied in 3000, 3400, and 3800 rpm, while the torque has been modified in 3, 4.5, and 6 Nm. The experimental results have indicated that the electrical performance of the thermoelectric modules decreases for an electrical current greater than 1.6 A. In general, the maximum electrical power of the TEG has been reached when the external load resistance has approached the total internal resistance of the TEMs. The maximum value of the electric power generated by the TEG has been 72 W, achieved with an engine speed of 3800 rpm and a torque of 6 Nm. These same conditions have allowed reaching an energy conversion efficiency of 2.61%.
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Keywords


Diesel Engine; Electrical Performance; Energy Conversion; Energy Recovery; Thermoelectric Generation

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