This paper reports tests to determine the effect of R- l34a-oil mixtures on condensation in a 1.32 mm hydraulic diameter extruded aluminum tube used in automotive refrigerant condensers. The tests were performed at 8 kW/mz heat flux for 600, 1000, and 1800 kg/m2s mass velocity with 3.25,6, and 10% oil concentration (by mass). At low vapor qualities, oil increases the condensation coefficient (h), and at vapor qualities above 50%, oil reduces the h-value. The h-reduction is more severe at increased oil content. Oil increases the pressure gradient, and the pressure-gradient increase is more severe at higher oil concentration.


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    Titel :

    Effect of Oil on R-134a Condensation in Parallel Flow Condensers


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Zhang, Ming (Autor:in) / Webb, R. L. (Autor:in)

    Kongress:

    1995 Vehicle Thermal Management Systems Conference and Exhibition ; 1995



    Erscheinungsdatum :

    1997-05-19




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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