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    Item type:Publication, Access status: with files ,
    Entropiebasierte Bewertungskriterien für den Wärmeübergang in Kraftwerksprozessen und ihre Relevanz für praktische Anwendungen
    (2014)
    Thorade, Matthis
    ;
    Herwig, Heinz
    All losses occurring during heat transfer result in entropy generation. This work inves-tigates, whether the entropy generation rate or related performance evaluation criteria are helpful for the design and optimization of heat exchangers. For this purpose, a de-tailed plate heat exchanger model has been developed using the programming lan-guage Modelica.
    Publicationtype: Doctoral Thesis
      2043  1459
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    Item type:Publication, Access status: with files ,
    Die Bewertung und numerische Optimierung von Wärmeübertragern anhand einer Energieentwertungszahl
    (2013)
    Wenterodt, Tammo
    ;
    Herwig, Heinz
    The entropic potential concept as well as the energy devaluation number is developed. Their advantage over common evaluation criteria for heat exchangers is demonstrated. For that purpose, a new method for the automated geometry optimization of heat exchangers based on CFD calculations is presented. It is based on the description of surfaces by Fourier coefficients and their optimization by an evolutionary algorithm.
    Publicationtype: Doctoral Thesis
      749  2234
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    Item type:Publication, Access status: with files ,
    Asymptotische Analyse von turbulenten Strömungen bei hohen Rayleigh-Zahlen
    (2006)
    Hölling, Marc
    ;
    Herwig, Heinz
    Turbulent natural convection is analysed asymptotically, i.e. for the limit of infinite Rayleigh numbers. It is distinguished between natural convection at vertical walls and Rayleigh-Benard convection. As a result, profiles for the near wall region are presented that offer a universal description of natural convection and are in good agreement with recent experimental and numerical data sets.
    Publicationtype: Doctoral Thesis
      557  589