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ORAL, BÜLENT

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BÜLENT

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Now showing 1 - 4 of 4
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    Natural gas reserve/production ratio in Russia, Iran, Qatar and Turkmenistan: A political and economic perspective
    (ELSEVIER SCI LTD, 2016) ORAL, BÜLENT; Esen, Vedat; Oral, Bulent
    In this study, changes in natural gas reserve/production ratio (R/P) of the four countries having the highest natural gas reserves (Russia, Iran, Qatar, Turkmenistan), the importance of which increases in the world market each day due to developing technology and the demand for clean energy, has been analyzed depending on the economic and political developments in national and international fields. Change of R/P ratio depending on years has been displayed on graphics from different sources and these alterations have been tried to be associated with such issues as natural gas agreements in history, hand over of political authority, economic crises etc. Therefore; it has been put forward whether or not political and economic changes of the countries are factors on the amount of natural gas production and the discovery of new reserve fields with the addition aim of providing a general overview on natural gas market. (C) 2016 Elsevier Ltd. All rights reserved.
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    Light sources of solar simulators for photovoltaic devices: A review
    (PERGAMON-ELSEVIER SCIENCE LTD, 2017) ORAL, BÜLENT; Esen, Vedat; Saglam, Safak; Oral, Bulent
    As solar power usage is increasing nowadays, performance tests have become one of the most important topics in order to guarantee the security of photovoltaic tools. For photovoltaic panels to become efficient, there is need for health testing of all materials and technologies used in the production of the panels in electrical and optical aspects. Thus, when future energy standards are considered, it is imperative to use solar simulators that obtain near real sunlight spectrum values. The most important components of solar simulators used in photovoltaic panel tests are light sources. In this study, solar simulators' were classified based on the light sources they use, and their history and technological development were investigated in line with the literature. Within the scope of this study, carbon arc lamps, sodium vapor lamps, argon arc lamps, quartz-tungsten halogen lamps, mercury xenon lamps, xenon arc, xenon flash lamps, metal halide lamps, LED and super continuum laser light sources were investigated. Additionally, to compare spectral deficiency among these light sources and solar simulators, multiple light sourced solar simulators were also covered under a separate title.
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    Smart indoor LED lighting design powered by hybrid renewable energy systems
    (ELSEVIER SCIENCE SA, 2017) ORAL, BÜLENT; Kiyak, Ismail; Oral, Bulent; Topuz, Vedat
    It's important to provide diversity in energy resources and to use sustainable energy resources besides local resources. In the recent years, LEDs have been increasingly used in interior lighting systems because of their low energy consumption, high light-flux efficiency and their ability to maintain the light-flux value at a constant level for a long period of time. In this study, a LED luminaire was designed by using the Osram Coinstar W4 brand power LED module. An LED drive card, which is a specialty of the luminaire, was designed to provide ideal functioning conditions and serve as a power supply for the LEDs. A communication card was designed for all kinds of information exchange between the LED luminaires, motion detectors and light sensors used with the laboratory lighting system, and an RS485 communication line was installed to connect every system. Under the control of the luminaire, the lighting was tested by a fuzzy-expert system. With this project design and test, a system was developed that can be used in interior spaces. (C) 2017 Elsevier B.V. All rights reserved.
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    Modeling of dimmable High Power LED illumination distribution using ANFIS on the isolated area
    (PERGAMON-ELSEVIER SCIENCE LTD, 2011) ORAL, BÜLENT; Kiyak, Ismail; Topuz, Vedat; Oral, Bulent
    High power light emitting diodes (HP-LEDs) are more suitable for energy saving applications and have becoming replacing traditional fluorescent and incandescent bulbs for its energy efficient. Therefore. HP-LED lighting has been regarded in the next-generation lighting. In this study, illumination distribution of white color HP-LED is modeled by adaptive neuro-fuzzy inference system (ANFIS) approach on the isolated area while LED head is fixed. Subtractive clustering with hybrid learning approach is used to train the realized ANFIS architectures. End of the numerous experiment we finally concluded that, ANFIS could be used to modeling the illumination distribution applications perfectly. (C) 2011 Elsevier Ltd. All rights reserved.