Person: TAŞKIN, ONUR
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TAŞKIN
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ONUR
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Publication Effect of microwave, infrared and freeze drying methods on drying kinetics, effective moisture diffusivity and color properties of turmeric(Galenos Publ House, 2019-01-01) Taşkın, Onur; TAŞKIN, ONUR; İzli, Nazmi; İZLİ, NAZMİ; Ziraat Fakültesi; 0000-0002-5741-8841; R-7996-2016; AAH-5018-2021In the present research, effect of methods that use the microwave (90, 160 and 350 W), infrared (60, 70 and 80 degrees C), and freeze drying for turmeric samples on the drying kinetics, effective moisture diffusivity and color were analyzed. Also ten distinct thin layer models of drying were used to predict their kinetics. Depending on the evaluation of the statistical tests, models of Midilli et al and Wang & Singh models were found the optimum ones for explaining drying characteristics of turmeric. Among the used methods, the fastest and slowest drying time was 65 min with microwave drying (350 W) and 600 min with freeze drying, respectively. The calculations demonstrate that the maximum effective moisture diffusivity value is obtained in microwave drying (350 W). Our study shows that although the freeze-drying increases the drying time, it showed closest color results against to fresh samples. In conclusion, microwave, infrared and freeze drying methods applied to turmeric should improve with the combined drying applications.Publication Technical and economic evaluation of energy production from wind in İstanbul and surrounds(Univ Cape Town, Energy Res Centre, 2015-11-01) Vardar, Ali; Taşkın, Onur; VARDAR, ALİ; TAŞKIN, ONUR; Mühendislik Fakültesi; Biyosistem Mühendislik Bölümü; 0000-0001-6349-9687; 0000-0002-5741-8841; AAH-5018-2021; AAH-5008-2021Istanbul is located in the northwest part of Turkey and has the greatest population of any city in the country. Istanbul and its surroundings were researched for wind potential. Energy production from wind was evaluated technically and economically in this study. Corlu, Kumkoy and Sile sites were examined. Other sites in the same region (Goztepe, Kirecburnu, Bahcekoy, Florya and Kartal) were also evaluated but the results were not satisfactory, and for this reason, these sites were not examined in this study. When we checked daily, monthly and yearly wind speed values and frequency distributions, the wind energy potential of Corlu, Kumkoy and Sile were greater than other sites. Corlu, Kumkoy and especially Sile's wind speed data are statistically decreasing. A Nordex N117 91m hub height wind turbine can produce 6099 MWh in Corlu, 6459 MWh in Sile, 7265 MWh in Kumkoy. A Nordex N117 91m hub height wind turbine can produce 6471 MWh in Corlu, 7439 MWh in Sile and 8175 MWh in Kumkoy. The energy costs were calculated by the average of 36 years of wind measurement data using Nordex N117 turbines. Energy costs with Nordex N117 91 m and 140 m hub height in Corlu, Sile and Kumkoy are 0.025- 0,027 US$/ KWh, 0.022- 0,025 US$/ KWh, 0.020- 0,023 US$/ KWh, respectively.Publication Influence of ultrasound pre-treatment and convective drying on the quality parameters of carrots ( Daucus carota l.)(Plapiqui(uns-conicet), 2022-01-01) Polat, Ahmet; İzli, Nazmi; Taşkın, Onur; POLAT, AHMET; İZLİ, NAZMİ; TAŞKIN, ONUR; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; 0000-0002-5741-8841; R-7996-2016; AAG-8333-2021; AAH-5018-2021In this study, carrot samples with different slice thicknesses (2 and 4 mm) were dried by applying ultrasound pre-treatment at different time periods (0, 20 and 40 min) and the changes in colour, rehydration, pH and degrees Brix values were evaluated. Besides, microstructures of dried samples under different conditions were observed through scanning electron microscopy images. Drying was carried out in a modified oven at temperatures of 60 and 70 degrees C with an air velocity of 1 m/s. When compared to fresh potatoes, a decrease in yellowing values (b*) was observed for the different drying conditions employed. Carrots samples with a thickness of 2 mm, dried at 60 degrees C and treated with ultrasound for 40 min, presented the highest rehydration ratio (6.930). It was observed that pH and degrees Brix values changed from 6.705 to 6.120 and from 68.70 to 6.80, respectively. It was observed that the longer the duration of pre-treatment with ultra-sound, the greater the change in the structure of the product. The results showed that the pre-treatment by ultrasound can be used as an alternative method for drying carrot sample.Publication Solar energy potential and facilities of use in kahramanmaras province(Kahramanmaras Sutcu Imam Univ, 2014-01-01) Korucu, Tayfun; Taşkın, Onur; TAŞKIN, ONUR; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; 0000-0002-5741-8841; AAH-5018-2021In order to prevent inaccurate investments, it is very important to perform studies which are based on the measurements of regional radiant intensity and sunshine duration before starting the construction of the plants or applications based upon the usage of solar energy which is a renewable energy source. In this study, solar energy potential of center and districts of Kahramanmaras which is a border city to two regions (Mediterranean Region and Southeastern Anatolia Region) that have the highest solar energy potential in our country, collected data by measurement station's pyranometers, has been discussed. It has been determined that city of Kahramanmaras has total annual 2918 hours of sunshine duration and 1608 kWh m(-2) radiant intensity. It has been concluded that from among districts, Pazarcik has the longest annual sunshine duration and Nurhak has the highest radiant intensity. It has been observed that high solar energy potential in city of Kahramanmaras is not being used sufficiently other than obtaining hot water.Publication Physicochemical and morphological properties of european cranberrybush powder manufactured by freeze drying(Taylor, 2021-01-01) Taşkın, Onur; İzli, Gökçen; İzli, Nazmi; TAŞKIN, ONUR; İZLİ, NAZMİ; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; 0000-0002-5741-8841; R-7996-2016; AAH-5018-2021This study investigated the rehydration, water activity, pH, Brix, color, bulk density, tapped density, flowability, cohesiveness, wettability, solubility values, and microstructures of freeze-dried European cranberrybush powders. Additionally, experimental freeze-drying data were coupled to nine thin-layer models, and the logarithmic model was chosen to estimate the moisture ratio of European cranberrybush. The pH and Brix values were measured between 3.0-3.2 and 40.33-52.00 for different powder sizes, respectively. A significant difference was observed for the water activity values of different powders that were classified into different powder sizes (P < .05). Moreover, it was identified that all powders exhibited "low" cohesiveness and "fair" flowability. However, the results showed that the highest bulk density (0.440 g/ml), tapped density (0.563 g/ml), wettability (4386 s) and solubility (264 s) were obtained in the samples with a ">500 mu m" powder size. According to the all scanning electron microscopy images, skeletal-like structures formed on the surfaces.Publication Application of different drying techniques on peach puree(Ankara Üniversitesi, 2021-01-01) Polat, Ahmet; Taşkın, Onur; İzli, Nazmi; POLAT, AHMET; TAŞKIN, ONUR; İZLİ, NAZMİ; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; 0000-0002-5741-8841; 0000-0002-2084-4660; 0000-0003-1673-7165; R-7996-2016; AAG-8333-2021; AAH-5018-2021In this study, six various applications were performed to dry peach puree using methods of convective drying (CD), microwave drying (MW1, MW2 and MW3) and combined convective-pulsed microwave drying (CD+MW2 and CD+MW3). Effect of drying on time, color, pH, Brix and micrographs were evaluated. The data of total drying time revealed that the maximum value was belonged to "CD" (220 min). The minimum value was obtained by "MW1" (10 min). By comparison of total color change (.E), the highest values were achieved with "CD+MW3", whereas the lowest values were achieved with "MW2". Under all drying applications, the maximum pH and Brix changes were observed with "CD+MW2". From the microstructure, the samples to which the microwave method was applied displayed a collapsed structure as to the sample dried by the convective method.Publication Mineral content of leaves, stalks and fruits of european cranberrybush plant (viburnum opulus l.)(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019-01-01) Taşkın, Onur; TAŞKIN, ONUR; Aşık, Barış Bülent; AŞIK, BARIŞ BÜLENT; İzli, Nazmi; İZLİ, NAZMİ; Ziraat Fakültesi; Toprak Bilimi ve Bitki Besleme Bölümü; 0000-0002-5741-8841; AAH-5018-2021; R-7996-2016In this study, the protein and mineral contents of fruit, stalks and leaves of naturally grown European Cranberrybush were investigated. The macro element contents of European Cranberrybush fruits, stalks and leaves were determined as 0.52-0.51-1.94% Nitrogen (N), 0.09-0.04-0.42% Phosphorus (P), 0.93-0.10-1.17%, Potassium (K), 0.21-0.48-2.44% Calcium (Ca), 0.05-0.04-0.37% Magnesium (Mg) and 0.04-0.06-0.09% Sodium (Na), respectively. The micro elements were found 12.81-215.83-436.35 mg kg(-1) Iron (Fe), 5.69-12.38-8.05 mg kg(-1) Copper (Cu), 6.45-19.97-25.81 mg kg(-1) Zinc (Zn) and 1.56-26.62-40.47 mg kg(-1) Mangan (Mn), respectively. Protein results of fruits, stalks and leaves were determined as 0.52%, 0.51% and 12.10%, respectively. The results showed that the protein and mineral contents of the leaves (except copper) were higher than the fruit and the leaves, and the alternative evaluation possibilities of leaves should be investigated.Publication Developing wind-concentrator systems for the use of wind turbines in areas with low wind-speed potentials(Wiley-V C H Verlag Gmbh, 2015-12-01) Vardar, Ali; Eker, Bülent; Kurtulmuş, Ferhat; Taşkın, Onur; VARDAR, ALİ; KURTULMUŞ, FERHAT; TAŞKIN, ONUR; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; Tarımsal Enerji Sistemleri; 0000-0001-6349-9687; 0000-0002-5741-8841; AAH-5008-2021; AAH-5018-2021; R-8053-2016The ability to supply energy in rural areas and in agricultural plants with renewable energy technologies, especially wind energy, is advantageous in terms of a sustainable environment and the increasing cost of energy. Today, wind turbines are used actively in many areas, some of which are for commercial purposes. Small-scale wind turbines that produce electricity directly have the necessary characteristics for use in agricultural plants. In this study, wind-concentrator systems for small-scale wind turbines that can be used in agricultural electrification applications have been designed for geographical areas where the wind-speed potential is low. Three different concentrator systems have been designed to make use of low wind-speed potentials and obtain high power values with relatively small rotor diameters. The three different designs have been produced as prototypes, and power values of 324-503 Wm(-2) (at 5 ms(-1) wind speed) can be obtained by concentrating the wind. The efficiency, power, energy production capacity, and economic elements of the models were determined, and the possible results for agricultural plants have been assessed. According to these assessments, the efficiency values are 71 and 90% for wind speed and 410 and 600% for wind power. The energy production capacities are a maximum of 6462, 5193, and 8226 kWhm(-2) per year for the conical wind-concentrator system, the wind-concentrator system with a panel, and the wind-concentrator system without a panel, respectively. If the energy production cost per unit of these systems is considered, these systems are not economical. Therefore, these systems must be produced on a large scale to become economical, and their size must be enlarged to reduce the cost. Consequently, the potential power values per unit area and the potential energy values per unit produced by the wind-concentrator systems will contribute to the production of more energy than that achieved by current wind turbines.Publication The determination of wind-powered irrigation potential in Turkey(Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2014-01-01) Taşkın, Onur; Uğlu, Gülsah; Büyükcangaz, Hakan; Vardar, Ali; TAŞKIN, ONUR; BÜYÜKCANGAZ, HAKAN; VARDAR, ALİ; Uludağ Üniversitesi; AAH-5008-2021; AAH-5018-2021; AAH-2934-2021Irrigation is considered a common need for agricultural production in all around the world. Instead of the high priced fossil fuels, wind-powered agricultural irrigation is an alternative usage of renewable energy in Turkey. However, it is necessary to be researched technically and economically before the implementation. In this paper; crop types, geographical frame, and groundwater quantity were taken into consideration in the context of technical feasibility. A cost analysis was done by consideration of the costs of water storage tanks, wind turbine, and pump as an economic feasibility study. The results of feasibility study provided that there is enough irrigation potential based on wind power in Marmara, Aegean and East Mediterranean regions. The increase in wind-powered irrigation will optimize the agricultural water use and preserve the environment from adverse impacts of greenhouse gases.Publication Design and performance of a hybrid (photovoltaic/wind) energy-assisted industrial dryer(Parlar Scientific Publications (P S P), 2019-01-01) Taşkın, Onur; İzli, Nazmi; Vardar, Ali; TAŞKIN, ONUR; İZLİ, NAZMİ; VARDAR, ALİ; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü; 0000-0002-5741-8841; 0000-0001-6349-9687; R-7996-2016; AAH-5018-2021; AAH-5008-2021An experimental hybrid energy-assisted dryer with a photovoltaic and wind auxiliary power system was designed, fabricated and tested. The developed dryer has been used in various weather and operating conditions. The effects of three drying air temperatures (50, 60, and 70 degrees C) and two air velocities (3 and 4 m/s) were investigated for maize kernel drying. Drying performance was evaluated in terms of drying kinetics, specific and total energy consumption, color and rehydration ratio. The results showed that total drying time decreased as the air velocity and drying air temperature increased. Depending on the drying times, the power-generation performances of the photovoltaic panels and the wind turbine were between 5.298 and 3.922 W, and 518 and 311 W, respectively. However, the energy consumption of the dryer was between 39.977 and 22.356 W. The best specific energy consumption was 7.561 kWh/kg at 50 degrees C at 3 m/s for 565 minutes. The color parameters indicated maize darkening in all drying conditions. The rehydration assays showed that rehydrated maize kernels reached a higher capacity with increased air temperature and air velocity.