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.


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    Title :

    Experimental and Modeling Study of a Heat Exchanger Concept for Thermoelectric Waste Heat Recovery from Diesel Exhaust


    Additional title:

    Sae Technical Papers


    Contributors:
    Baker, Chad (author) / Shi, Li (author)

    Conference:

    SAE 2012 World Congress & Exhibition ; 2012



    Publication date :

    2012-04-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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