Browsing by Author "Kibar, Ali"

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Investigation of a Heat Storage System Consisting of Basalt Stones, Water and a Phase Change Material
(Elsevier, 2022) Ucler, Kemal; Kibar, Ali; Ertunc, H. Metin; Yigit, Kadri Suleyman
In this study, the storage of solar energy as thermal energy is experimentally examined. A special heat storage unit is designed to store solar energy in liquid, stones and phase change material. Water, basalt stones, paraffin and air were used as the liquid, stones, phase change material and heat transfer fluid, respectively. Unlike classical designs, a glass cover is used for the heat storage unit, which receives direct solar radiation from the southern facade. Thus, the effect of the direct contact of the solar radiation with the stones on the performance of the heat storage unit is investigated. In the heat storage unit, if the sun does not directly reach the stones, the maximum temperature of the stones that can be reached is 46.6 degrees C whereas when the sun hits the stones directly, a maximum temperature of 56.8 degrees C can be achieved. It is suggested that an average of 50.3% of the energy requirement for heating from sunset to sunrise, depending on the weather conditions of the days of the exper-iments can be obtained using the solar energy heat storage unit designed in this study.
Numerical Investigation of Hydraulic Efficiency of the Grate Inlet
(Asce-amer Soc Civil Engineers, 2023) Ucler, Nadire; Kibar, Ali
Various grate inlets are commonly used for different purposes. Since the grate inlets' water-catching capacity depends on many factors, defining the best option is crucial for a sustainable drainage system. In this study, four cases with the same length, width, and void area but different geometries have been numerically studied to establish to which extent the design difference in the grate inlet affects the water-catching capacity. It has been determined how much of the approaching flow is caught by the grate inlets placed on the road with constant transverse and longitudinal slopes. The most efficient case is examined in more detail to determine the effect of the void area location on the water-catching capacity. The numerical results are discussed by comparing them with the analytical results. It has been confirmed that the location and shape of the void areas have an essential effect on the efficiency of grate inlets. Even though the void area is equal, it is concluded that the continuous void areas are more effective than the discontinuous areas. According to the results, choosing the most suitable grate among the alternative inlet designs is possible, or developing a more effective new design using numerical results provides the opportunity to compare the designs.