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Öğe An exergy analysis of a concentric tube heat exchanger using hBN-water nanofluids(Inder Science Publishers, 2021) Budak Ziyadanoğulları, Neşe; Perçin, SüleymanThis study investigated the effects of using nanofluids prepared with hexagonal boron nitride (hBN) nanoparticles on the thermal performance and pressure drop of a concentric tube heat exchanger. Experiments were carried out with water-hBN nanofluids for stable, dispersed, 0.01%, 0.1% and 1% volume concentrations, at different flow rates and Reynolds numbers under parallel and counter-flow conditions. When the experimental results were examined, the exergy loss was higher in the parallel-flow heat exchanger compared to the counter-flow heat exchanger. The highest exergy loss value was obtained for distilled water at the highest Reynolds number (Re = 8,700) for parallel flow operation at 170 W. The exergy loss of water at the highest Reynolds number (Re = 8,700) for parallel flow operation increased by 15.7%, 24.8% and 49.8% for hBN-water concentrations of 0.01%, 0.1% and 1%, respectively. Exergy loss of water at the highest Reynold number (Re = 8,700) for counter flow operation increased by 11.3%, 17.3% and 29.2% for hBN-water concentrations of 0.01%, 0.1% and 1%, respectively. When evaluating the exergy analysis of the system, exergy losses due to pressure drops were negligible for both flows (parallel and counter).Öğe Konsantrik tip bir ısı değiştiricisinde türbülatörlerin etkisinin sayısal incelenmesi(Muğla Sıtkı Koçman Üniversitesi, 2015) Oktay, Hasan; Budak Ziyadanoğulları, Neşe; Yücel, Halit Lutfi; Işık, Mehmet ZerrakkiÖğe Çok katmanlı duvar ve çatı tiplerinin ısıl ve fiziksel özelliklerinin dinamik ısıl karakterlerine olan etkisinin incelenmesi(Muğla Sıtkı Koçman Üniversitesi, 2015) Oktay, Hasan; Budak Ziyadanoğulları, Neşe; Argunhan, Zeki; Yumrutaş, Recep; Işık, Mehmet ZerrakkiÖğe Farklı kurutma yöntemlerinin incelenmesi ve kurutma parametrelerinin ürünler üzerindeki etkisinin karşılaştırılması(ISPEC Publishing, 2019) Budak Ziyadanoğulları, Neşe; Baskın, Zozan; Dongaz, NecipÖğe Boron usage and advantages in energy applications(Batman Üniversitesi, 2018) Budak Ziyadanoğulları, Neşe; Perçin, SüleymanÖğe New generation solar batteries: biophotovoltaics(Dicle University, 2019) Budak Ziyadanoğulları, Neşe; Özdemir, YunusIn this review study, the applications of plants to obtain energy from the electron flow formed as a result of photosynthesis reaction were investigated. Biophotovoltaic (BPV) devices are biological solar cells that convert the energy released into electrical energy by microorganisms such as algae. A series of reactions occurs when the solar radiation falls on the alga. Water is divided into three parts: proton (H + ion), electron and oxygen. These ions and the element of oxygen are vital for the inorganic substances contained in carbohydrates and proteins, which allow the growth of alga. Electricity is produced when the sensor is placed in a system containing two electrodes separated by a membrane that allows only protons to pass through. Electrons produced during photosynthesis pass through an external circuit to water form and reunite with proton and oxygen at the reductive electrode (cathode). Electricity is generated as a result of flow passing through the external circuit and can be used to operate electronic devices.Öğe Effects of nanofluids on the efficiency of a flat plate solar collector(Fırat Üniversitesi, 2015) Budak Ziyadanoğulları, Neşe; Yıldız, Cengiz; Yücel, Halit Lutfi
