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    THEORETICAL INVESTIGATION OF A SOLAR AIR HEATER ROUGHENED BY RIBS AND GROOVES
    (2018) Yıldırım, C.; Özdil, N. F. Tümen
    In this study, thermal and thermohydraulic efficiencies of a solar air collector having a roughened absorber with rib-grooved artificialroughness elements have been investigated and compared with the flat plate solar air collectors. The system has been theoreticallyinvestigated for different geometrical roughness parameters by help of energy balance equations between the elements of collector.Geometrical roughness parameters such as ratio of the relative roughness height (RRH), relative roughness pitch (RRP), and groovepositions to pitch (GP/PR) are examined for Reynolds number range from 3000 to 21,000.