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Experimental and Modeling Study of a Heat Exchanger Concept for Thermoelectric Waste Heat Recovery from Diesel Exhaust
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
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Approximately one-third of the fuel energy consumed by an internal combustion engine flows out the tailpipe as waste heat. Thermoelectric devices are being considered as a means of utilizing some of this waste heat to generate electric power on vehicles. A 1.1-liter volume flat plate heat exchanger was fabricated to study the heat transfer characteristics of a conceptual design for thermoelectric waste heat recovery from diesel exhaust, and used to validate a heat exchanger model. The heat exchanger consisted of an exhaust channel and two coolant channels all having rectangular cross-sections. The experimentally measured heat transfer rates were compared with a finite element heat transfer model to be used both for heat exchanger development and modeling thermoelectric device performance. In both the model and the experiment, alumina paper was used as a surrogate for the thermoelectric materials. The minimum and maximum heat transfer rates calculated from the model were 188 W and 1.89 kW, respectively, and the heat exchanger effectiveness from the model ranged from 0.110 to 0.169 for gas exchange rates from 65.7 s-₁ to 334 s-₁. The measured minimum and maximum heat transfer rates from the experiments were 385 W and 1.45 kW, with effectiveness ranging from 0.079 to 0.258. While there was good trend-wise agreement between the model and experiments, unaccounted for entrance effects and effects of measurement locations likely contributed to the observed differences between the two.
CitationBaker, C. and Shi, L., "Experimental and Modeling Study of a Heat Exchanger Concept for Thermoelectric Waste Heat Recovery from Diesel Exhaust," SAE Technical Paper 2012-01-0411, 2012, https://doi.org/10.4271/2012-01-0411.
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