• performance of microchannel condensers with metal foams on the air-side: application in small-scale refrigeration systems

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 676
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the thermal-hydraulic performance of microchannel condensers with open-cell metal foams to enhance the air-side heat transfer is investigated in this paper. three different copper metal foam structures with distinct pore densities (10 and 20 ppi) and porosities (0.893 and 0.947) were tested. a conventional condenser surface, with copper plain fins, was also tested for performance comparison purposes. the experimental apparatus consisted of a closed-loop wind tunnel calorimeter and a refrigerant loop, which allowed the specification of the mass flow rate and thermodynamic state of r-600a at the condenser inlet. the experiments were performed at a condensing temperature of 45 °c. the air-side flow rate ranged from 1.4 × 10−3 to 3.3 × 10−3 m3/s (giving face velocities in the range of 2.1–4.9 m/s). the heat transfer rate, the overall thermal conductance, the colburn j-factor, the friction factor and the pumping power were calculated as part of the analysis.

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