The increasing use of electric systems in commercial aircraft requires new cooling systems with higher cooling capacities. The fluids used in these systems have to meet environmental and safety requirements. R245fa is investigated as coolant to substitute commonly used fluids. The low system pressure and high critical temperature are the main advantages. The power electronics which will be integrated into the More Electrical Aircraft can only be sufficiently cooled using liquid or two-phase fluids. For this reason R245fa is investigated in detail as a two-phase coolant. During the presentation different system architectures using R245fa will be analysed and assessed using the modeling language Modelica. Two different architectures were presented, one connecting the power electronics in series with respect to the coolant flow and another connecting the power electronics in parallel. The parallel architecture allows for the different junction temperatures to be controlled independently from each other, which also assures a certain energy optimisation, since the components are not colder than they have to be. Additionally it was shown that in any two-phase architecture the control of the system pressure is crucial and can be done either by controlling the ram air mass flow rate or by partly bypassing the condenser.


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    Title :

    Usage of R245fa in a More Electrical Aircraft


    Additional title:

    Verwendung von R245fa in einem More Electrical Aircraft


    Contributors:


    Publication date :

    2009


    Size :

    8 Seiten, 7 Bilder, 2 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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