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    CO2 emission during the combustion of Orhaneli lignite coal
    (Emerald Group Publishing Ltd, 2017) Ozkaymak, Mehmet; Ceylan, Mehmet Ali; Okutan, Hasancan; Atakul, Husnu; Berrin, Engin; Coskun, Tuba; Inanc, Ozgur
    Purpose - In Turkey, dependence on foreign countries for energy is a problem which upsets all economic balances. Turkey's biggest fossil energy source is lignite coal. Therefore, energy conversion of lignite in thermal plants, causing minimum environmental effect is extremely important. The basic problem in terms of the combustion technology is to improve the combustion technology that can burn the low-qualified fuels that do not have standard fuel features (lignite, peat, schist). The most suitable technology today for the efficient and clean combustion of nonstandard low-qualified fuels is the combustion at fluidized-bed technology. In this study, CO2 emission that occurs during the combustion of Orhaneli coal that is one of our native low-qualified lignite, has been investigated according to the experimental study. Design/methodology/approach - For this combustion experiment, laboratory-scaled circulating fluidized-bed (CFB) process that exists at TU BITAK-MAM Energy Institute which has been designed and used before has been used. The effect of excess-air coefficient, combustion type and bed temperature to the greenhouse gas formation and CO2 emission has been investigated experimentally. In terms of flue gas emissions, it has been detected that the decrease of the amount of CO2 that has occurred has no positive effects on combustion efficiency, water vapor, SO2, NOx, CO and other gases which occur during deficient combustion must be thought as a whole and each reaction affects each other similar to complex reactions. Findings - As a consequence of measuring CO2 emissions over 10 minute periods, CO2 emissions are 12.43 percent average, CO2 decreases at different air coefficient values; Often form undesirable side reactions such as CO, NOx with back and forth reactions. Originality/value - The importance of aerodynamic structure of the system, and the losses and leakages forming in the system has been observed experimental and affected parameters are evaluated.
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    Determination of the heat transfer coefficient of PV panels
    (Pergamon-Elsevier Science Ltd, 2019) Ceylan, Ilhan; Yilmaz, Sezayi; Inanc, Ozgur; Ergun, Alper; Gurel, Ali Etem; Acar, Bahadir; Aksu, Ali Ilker
    In this study, the efficiency of the rear-panel air velocity in cooling was investigated based on the temperature and solar radiation in the environment where the panels are located. During the cooling of the panels, the rear-panel temperature decreases, and accordingly, the open-circuit voltage of the panels increases. At present, the most important losses in panels are due to the increase in panel temperature depending on the solar radiation and outdoor air temperature. In this study, the rear-panel temperature changes were observed at 0-5 m/s air velocities and 10-40 degrees C. The calculations reveal that in winter weather conditions, the temperature of the panels did not increase at a level that would require cooling. This study investigated the heat transfer from the surface depending on the outdoor air temperature of the rear-panel air velocity and the changing rear-panel temperature. The effect of different outdoor air temperatures on the rear-panel heat transfer is minimal. When the air velocity was 5 m/s and the outdoor air temperature was 10-40 degrees C, the heat transfer in the Poly Crystal Solar panel was calculated as 11.6 W/m(2)K. (C) 2019 Elsevier Ltd. All rights reserved.
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    Freeze-Drying of Persimmon (Diospyros Kaki) Slices Investigation of Drying Characteristics
    (Gazi Univ, 2023) Dagdeviren, Abdullah; Acar, Bahadir; Alhammadiy, Abdullatif; Roshanaei, Khandan; Coskun, Tuba; Inanc, Ozgur; Ozkaymak, Mehmet
    This study was performed to define the kinetic drying model and to define the effective diffusivity coefficient of the fruit, which is called Diospyros kaki in the literature, from the family of Ebonaceae known as the Persimmon in our country. In the study, blueberries by the weight of 100 g and with a thickness of 5 mm were placed in the drying device, and the data were processed by observing the weight loss every two hours after being subjected to the drying process for 14 hours. 8 different kinetic drying models were applied to the acquired data using the Matlab program. As a result of the application, the estimated standard errors (RMSE), chi-square (X-2), regression coefficients (R-2) were calculated, error analysis was performed, R-2, X-2, and RMSE values were found, as 0.019483, 5.062 x 10(-4) and 0.9558. According to these results, it was determined that the most suitable model is the Page model. Also, the effective diffusivity coefficients for Persimmon (Diospyros Kaki) were calculated as 1.79775 x 10(-10) m(2)/s.