• thermoelectric power generator design for maximum power: it’s all about zt

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 885
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     there is a significant amount of literature that discusses thermoelectric power generator (teg) design, but much of it overly simplifies the design space and therefore the results have limited use in designing real-life systems. this paper develops a more comprehensive model of the thermal and electrical interactions of a teg in a system with known hot-side and cold-side thermal resistances and corresponding constant system temperature differential. two design scenarios are investigated for common teg system applications. in one method, the power from a teg is maximized for a given electrical load, simulating a case where the teg is electrically in series with a known load such as a fan. in the second design scenario, the power from a teg is maximized for a given electrical load resistance ratio, n (the ratio between the external load resistance and the internal teg resistance), simulating an application where the teg is electrically in series with a load-matching converter. an interesting conclusion from this work is that, in the first design scenario, the electrical load resistance ratio, n, that

      1+zt

    (where zt is the thermoelectric figure of merit) instead of 1 as reported previously in literature. equally interesting is that, if you define an analogous thermal resistance ratio, m′ (representing the ratio between the teg thermal resistance at open-circuit conditions and the system thermal resistance), the maximum power in both design scenarios occurs at 1+zt

    instead of the commonly cited value of 1. furthermore, results are presented for real-life designs that incorporate electrical and thermal losses common to realistic teg systems such as electrical contact resistance and thermal bypass around the teg due to sealing.

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