Person: KAYNAKLI, ÖMER
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KAYNAKLI
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ÖMER
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Publication Economic thermal insulation thickness for pipes and ducts: A review study(Elsevier, 2014-02-01) Kaynaklı, Ömer; KAYNAKLI, ÖMER; Mühendislik Fakültesi; Makine Mühendisliği Bölümü; DBD-5807-2022Energy conservation has become an increasingly important issue for all sectors, particularly in industry. Therefore, the thermal performance of insulation systems and their influence on heat loss/gain in various applications in addition to economic considerations have received increased attention in recent years. In this study, a literature review of papers that addressed the optimum economic thickness of the thermal insulation on a pipe or duct with different geometries used in various industries was carried out The studies related to determining the critical insulation thickness for different geometries including circular shapes were investigated. The heat transfer equations, the basic results, the optimization procedures and the economic analysis methods used in the studies were presented comparatively. Additionally, a practical application example based on optimizing the insulation thickness on a pipe was performed, and the effective parameters of the optimum thickness were investigated.Publication A modeling of electricity generation by using geothermal assisted organic rankine cycle with internal heat recovery(Taylor & Francis Inc, 2019-11-07) Bademlioğlu, A. H.; Canbolat, A. S.; CANBOLAT, AHMET SERHAN; Kaynaklı, O.; KAYNAKLI, ÖMER; Mühendislik Fakültesi.; HPH-3328-2023In this study, the performance of organic Rankine cycle (ORC), which produces electrical energy, was examined by using a geothermal resource with a temperature of 145 degrees C. The fluids used in the system were determined as dry type fluids, and R142b, R227ea, R245fa, R600, and R600a were preferred as a working fluid. Within the scope of this study, energy and exergy analysis of the system was performed for different evaporator pressures (1000-2000 kPa). With the help of these analyses, the performances of the cycle elements were examined and the first and second law efficiencies of the system were compared for different refrigerants. Considering the selection of refrigerant, and evaporator pressure within the scope of this study, the first and second law efficiencies of the cycle have enhanced maximum of 4.86% and 19.78%, respectively.Publication Thermohydraulic performance optimization of automobile radiators using statistical approaches(Asme, 2022-05-01) Canbolat, Ahmet Serhan; Bademlioğlu, Ali Hüsnü; Kaynaklı, Ömer; CANBOLAT, AHMET SERHAN; KAYNAKLI, ÖMER; Gemlik Asım Kocabıyık Meslek Yüksekokulu; Hibrit ve Elektrikli Araç Teknolojisi Programı; HPH-3328-2023; DBD-5807-2022Automobile radiator which is one of the vital components used for engine cooling in vehicles is expected to provide higher thermal performance without changing the exterior dimensions of the radiator with the development of engine technology. This situation necessitates changes in both design and operating parameters in the currently used radiator. In the present study, all fundamental parameters affecting the thermal and hydraulic performance of an automobile radiator are evaluated and optimized with statistical methods. Optimization study is carried out using Taguchi and ANOVA methods for two specified objective functions (heat transfer and pressure drop). The order of importance and impact rates for each design and operating parameter, the best and worst working conditions in terms of both target functions are determined. Air velocity, air inlet temperature, coolant inlet temperature, and fin pitch are found to be the most effective parameters on the heat transfer with a contribution ratio of 88%. The best and worst working conditions are obtained for the heat transfer and under these working conditions, they are calculated as 43.68 kW and 1.63 kW, respectively. When the system is examined in terms of the pressure drop, the results show that the coolant flowrate and tube height have a great impact with a contribution ratio of 67.04% and 32.06%, respectively. Lastly, the maximum and minimum pressure drop within the studied operating condition range is determined as 20.68 kPa and 0.12 kPa, respectively.Publication A parametric analysis of the performance of organic rankine cycle with heat recovery exchanger and its statistical evaluation(Turkish Soc Thermal Sciences Technology, 2019-01-01) Bademlioğlu, Ali Hüsnü; Canbolat, Ahmet Serhan; YAMANKARADENİZ, NURETTİN; CANBOLAT, AHMET SERHAN; Yamankaradeniz, Nurettin; Kaynaklı, Ömer; KAYNAKLI, ÖMER; Mühendislik Fakültesi; Makine Mühendisliği Bölümü; AAA-1753-2021; HPH-3328-2023; AAI-8222-2021In this study, the performance of a case study of Organic Rankine Cycle with heat recovery exchanger using different fluids is analyzed. As the fluids worked in the cycle, the commonly used R134a, R236fa, R245fa, R600a, R717 and R718 are preferred. Cycle performances of the selected fluids are compared based on both the heat source's temperature that changes between 80 degrees C and 109 degrees C and the effectiveness of the heat exchanger. Furthermore, the contribution ratios and the order of importance of the parameters affecting the performance of the cycle are evaluated using the Taguchi statistical method. As a result, the effect of the waste-heat source temperature on the performance of the system is greater than the other parameters examined, and the contribution ratio of this parameter is determined as 59.80%. However, effectiveness of heat exchanger is found to be the least effective parameter and the effect ratio is calculated as 2.18%. In addition, the best and worst operating conditions are determined from the statistical analysis, and in these conditions, the thermal efficiencies of the Organic Rankine Cycle are obtained as 15.26% and 8.61%, respectively.Publication Performance assessment and solution procedure for series flow double-effect absorption refrigeration systems under critical operating constraints(Springer Heidelberg, 2019-06-01) Yılmaz, İbrahim Halil; Kaska, Önder; Saka, Kenan; SAKA, KENAN; Kaynaklı, Ömer; KAYNAKLI, ÖMER; 0000-0001-7840-9162; 0000-0002-2296-894X; AAH-5303-2021; AAX-2458-2020In this study, the effects of critical operational constraints on the operational domain of a double-effect lithium bromide/water absorption refrigeration system and its performance were investigated. These constraints were determined as the equivalence state of concentrations, the thermal unbalance between the system components of high-pressure condenser and low-pressure generator, freezing and crystallization risk of lithium bromide/water solution. For the system analysis, a simulation program was developed, and its detailed solution procedure was presented. The program outputs were initially validated with the literature. Subsequently, parametric studies were conducted for broad ranges of the component temperatures. The results demonstrate that the considered constraints were essential for acceptable design and the operational control of double-effect absorption refrigeration systems. The simulations will help to figure out under which operating conditions a double-effect absorption refrigeration system functions effectively and what kind of control strategies are essentially required to increase the coefficient of performance. Based on the operation scenario of fixed high-pressure generator temperature, the proposed system can enhance the coefficient of performance up to 31% and 84% as compared to its counterparts which function under the variable high-pressure generator temperature and the pinch point temperature difference (5K between the high-pressure condenser and the low-pressure generator), respectively.