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    Energy potential from biomass from agricultural crops: Development prospects of the Turkish bioeconomy
    (Pergamon-Elsevier Science Ltd, 2022) Ozdil, N. F. Tumen; Caliskan, M.
    In this paper, biomass potential produced from agricultural crops and generation of electricity using biomass have been calculated for the regions of Turkey between years of 2008-2018. The total amount of agricultural crop was calculated to be 771,354 kiloton (kt) of which amount 599,166 kt was arable field crops and 172,188 kt was horticultural crops. Moreover, the total amount of theoretical average biomass potential provided from arable field crops and horticultural crops in Turkey have been calculated as 522,875 kt and 51,359 kt dry mass, respectively. The Central Anatolia Region and the Mediterranean Region have the maximum theoretical biomass potential provided from the arable field crops and horticultural crops with 139,453 kt and 14,591 kt dry mass, respectively. In accordance with data collected from the Turkish Energy Ministry, electricity used in the period 2008-2018 amounts to 2,726 x 10(9) kWh for Turkey while the electricity potential obtained from agricultural crops for the same years about 994 x 10(9) kWh. Namely, 36% of the energy requirement can be met from biomass potential from agricultural crops. Furthermore, a circular economy model has been developed for the Mediterranean Region and discounted payback period is found to be 14 years in this study. (c) 2022 Elsevier Ltd. All rights reserved.
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    THEORETICAL INVESTIGATION OF A SOLAR AIR HEATER ROUGHENED BY RIBS AND GROOVES
    (Yildiz Technical Univ, 2018) Yildirim, C.; Ozdil, N. F. Tumen
    In this study, thermal and thermohydraulic efficiencies of a solar air collector having a roughened absorber with rib-grooved artificial roughness elements have been investigated and compared with the flat plate solar air collectors. The system has been theoretically investigated 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 groove positions to pitch (GP/PR) are examined for Reynolds number range from 3000 to 21,000.