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    Analysis Of The Effect Of Transparent Covers On Receiver Of Cylindrical Parabolic Solar Collectors
    (Gazi Univ, 2023) Sahinaslan, Apdulmutalip; Buruntekin, M. Lutfi; Oztop, Mesut
    Parabolic solar collectors with central receiving systems are preferred due to their high efficiency despite their high initial investment and operating costs. In this strip the effect of two glass covers on tubular collector will be investigated, aiming enhancement of cylindrical parabolic solar collectors efficiency. By using glass cover it is aimed to decrease losses and increase efficiency. In order to investigate the changes or losses and instantaneous efficiency, a model was constructed considering all parameters of the structure, optical losses, material properties and outdoor climatic conditions. Results of calculations show that the two-cover system is not more efficient than the single cover system at low fluid temperatures between 0 and 500 K and the efficiency of the two-cover stem is increased at medium fluid temperatures between 500 and 700 K.
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    Control of temperature distribution for Li-ion battery modules via longitudinal fins
    (Elsevier, 2022) Oztop, Mesut; Sahinaslan, Apdulmutalip
    Many kinds of cooling methods are used in electric vehicles' battery thermal management systems both in commercial applications and research. Air cooled systems, due to its basic construction and low cost are worthy to develop despite of low cooling performance. In this study, a novel air cooled battery thermal management system is proposed, especially for low power applications. Commonly used cylindrical Li-ion batteries were redesigned with rectangular fins donated on the side surface longitudinally. Aligned and staggered arrays for 4S6P battery module and three different fin configurations were envisaged for two different spacing between batteries, air flow direction and Re numbers. Different air inlet temperatures were also used as parameters. Results showed that fins have a great effect on cooling performance so that they allow for optimum battery temperature condition; maximum temperature for batteries is between 15 degrees C and 35 degrees C. On the other hand, they are insufficient to sustain temperature uniformity for 5 degrees C temperature difference in entire module volume. Distances between batteries and air flow direction are also decisive for a successful thermal design.