The general aspects of thermal comfort are discussed in order to define a thermal comfort index. In this way, a more rational approach to the problem, moving from a 'qualitative' evaluation to a 'quantitative' one, is obtained. The definition of thermal comfort indices leads to a more rational approach to the problem, shifting the approach from a 'qualitative' evaluation (the tester's subjective opinion) to a 'quantitative' one (the numerical value of the index). The fundamental aspects of the index definition are related to the aerodynamic situation; in particular, the velocity and temperatures fields must be evaluated. An experimental approach is very difficult, because small variations and low levels of phenomena such as temperature and flow velocities have to be measured, and, mainly, because these fields are highly related to the Reynolds number and geometrical details. Therefore, it is not possible to use a scale model since a real car must be tested. Obviously, using this method it could be very difficult to make modifications to improve the comfort. The comparison of CFD results with experimental ones shows a satisfactory correlation, but the accuracy of the numerical results could probably be improved. In particular, it seems necessary to have more accurate results and to take into account also the external flow, that is not represented in the present evaluations. This could represent a source of uncertainty, and, in the next phase of the project a full evaluation will be done. Furthermore, the solar load model and the thermal characteristics of the isolation panels could be better represented. The defined procedure, by using CFD, gives important indications about thermal comfort from the initial phase of the design, and it can now be considered an important tool for the optimal design of the internal flow systems.


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    Titel :

    The use of CFD to improve the thermal comfort in the automotive field


    Weitere Titelangaben:

    Nutzung der numerischen Strömungssimulation zur Erhöhung des Wärmekomforts in Kraftfahrzeugen


    Beteiligte:
    Lombardi, G. (Autor:in) / Maganzi, M. (Autor:in) / Cannizzo, F. (Autor:in) / Solinas, G. (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    13 Seiten, 9 Bilder, 8 Tabellen, 15 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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