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    INVESTIGATION OF HEAT TRANSFER TYPES IN AN AUTOMOBILE FOG LAMP WITH COMPUTATIONAL FLUID DYNAMIC ANALYSIS
    (Znack Publishing House, 2016) Sökmen, Kemal Fürkan; Yaiviankaradeniz, Nurettin; Coskun, Salih
    This study investigated the temperature distribution and heat transfer in an automobile fog lamp. First, a mesh independent solution was obtained. The results were compared with the literature and validated with test results. Measurements were taken from five different points by using thermocouple. Tests were applied for two hours at 24 degrees C. For thermal analysis, ANSYS CFX 12.1 was employed. Air flow inside the fog lamp was assumed as steady, incompressible, laminar and three-dimensional. Thermophysical property variations, buoyancy and radiation effects were taken into consideration. The radiation effect is an important heat transfer type to be considered in the temperature distribution on the lenses of automotive lighting systems. The radiation effect can have a negative influence on the lens due to the selection of unsuitable material. Despite the complexity of the bulb geometry and its non-isothermal surface conditions, general flow and heat transfer characteristics did not change.
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    Transient thermodynamic and parametric analysis of solar-assisted Rankine cycle
    (Sage Publications Ltd, 2025) Duzcan, Ahmed; Arslanoglu, Nurullah; Coskun, Salih; Kara, Yusuf Ali
    In this study, the parabolic solar collector supported Rankine cycle is thermodynamically and parametrically conducted using the TRNSYS program. The system contains a collector cycle, an auxiliary heater cycle and a Rankine cycle. In the Rankine cycle, water vapor is employed as the heat transfer fluid, whereas in the other two cycles, heat transfer fluid with a boiling temperature of 359 degrees C is utilized. In the system, an auxiliary heater is configured to maintain a source-side temperature of 250 degrees C prior to entering the steam boiler. The whole system is analyzed throughout the year for different collector tilt angles. In addition, nine different scenarios are designed so that the collector area, tank volume, turbine and condenser pressures in the Rankine cycle, flow rate in both collector and auxiliary heater cycle and three different provinces are analyzed. Collector outlet temperature, collector efficiency, SF, Rankine cycle efficiency, system thermal efficiency and utilization factor are analyzed. The maximum values observed in the analyses are as follows: the overall system efficiency of 5.46% in Scenario 5; the Rankine cycle efficiency of 24.1% in Scenarios 8 and 9; the utilization factor of 24.03% in Scenario 5; SF of 100% except Scenario 4 and 9; the collector efficiency of 28.96% in Scenario 4; and the collector outlet temperature of 303 degrees C in Scenario 7. In Scenario 5, the turbine delivers its peak performance at roughly 346 MWh, resulting in a net energy of approximately 157 MWh, the highest among all cases.