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    DESIGN AND ANALYSIS OF DOUBLE-PIPE HEAT EXCHANGER USING BOTH HELICAL AND ROTATING INNER PIPE
    (Vinca Inst Nuclear Sci, 2021) Koca, Tarkan; Citlak, Aydin
    In this study, the effects of rotating straight and helical inner tubes is experimentally discussed to determine heat transfer and pressure losses in rotating tubes and improve heat transfer. The outer tube remains stationary and the inner tube is rotated at different speeds in the work. In the experiments for straight and helical tubes, the flow regime is turbulent. According to the results, Nusselt number, pressure loss, and efficiency of heat exchanger were gauged. In addition, empirical formulas were obtained for each pipe type. It is observed that as the rotation speed of the pipe increases, the heat transfer rate increases. The pipe that provides the best increase in heat transfer is the five helixes tubes. At five helixes tubes; after the number of revolutions per minute exceeds 300, the increase in heat transfer rate has almost halt. At five helixes tubes and at 300 rpm speed when the flow of cold water through the annular gap with the fluid passing through the inner tube is equal, the heat transfer increases by 124.10% compared to straight tube, 23.47% compared to two helixes tubes, 7.92% compared to three helixes tubes, and 1.65% compared to four helixes tubes. Maximum effectiveness was obtained while rotating with 300 rpm in five helixes pipes.
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    PERFORMANCE AND ENVIRONMENTAL IMPACT ANALYSIS OF A GRID-CONNECTED PV POWER PLANT USING AI-BASED REAL-TIME MONITORING
    (Publ House Bulgarian Acad Sci, 2025) Kisecok, Busra; Koca, Tarkan; Citlak, Aydin
    In this study, the performance evaluation of grid-connected photovoltaic systems with a capacity of 4101.12 kWp installed by Baykan Denim company in Malatya province is carried out. The performance ratio, temperature, energy, radiation values used in the evaluation of the analysis are obtained every five minutes with the Solarify artificial intelligence-based performance monitoring network. The system efficiency is 16.53% and the performance ratio is 0.81. In addition, it was determined that 3022.61 tons of CO2 emissions were reduced annually thanks to the installed SPP (Solar power plant). It is concluded that the installation of PV systems provides considerable environmental and economic benefits.