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This study predicts the effect of insulation thickness on residential- and population-sourced energy demands and emission amounts in the future with a new method. Attempts are made to determine the future population increase amounts with the graphic method for 2018-2040. The current population of 5,600,386 in Ankara/Turkey is predicted to rise to 8,043,717 people in 2040. Additionally, the number of residences is predicted to be 1,608,743 and wall area will be 160,874,330 m2. The total annual carbon dioxide amount for natural gas, coal and fuel oil is estimated to reach 916,179,309 kg/year, 1,304,690,816 kg/year, and 1,818,523,426 kg/year with 44% increase from 2018 to 2040, respectively. In 2018, the city-based heading period carbon footprints (CBHPCF) are 113.9, 162.2 and 226 kg/person-year for natural gas, coal and fuel oil, respectively. It is calculated that the CBHPCF will respectively be 163.56, 232.92 and 324.54 kg/person-year for the three fuels in 2040. The city-based heating period sulfur dioxide amount is estimated to be 0.460 kg/year for coal and 1,751 kg/person for fuel oil in 2040. Thus, the study can provide a clear picture for policy makers concerned about the future of the world.
Mustafa Ertürk; Ali Keçebaş. Prediction of the effect of insulation thickness and emission on heating energy requirements of cities in the future. Sustainable Cities and Society 2021, 75, 103270 .
AMA StyleMustafa Ertürk, Ali Keçebaş. Prediction of the effect of insulation thickness and emission on heating energy requirements of cities in the future. Sustainable Cities and Society. 2021; 75 ():103270.
Chicago/Turabian StyleMustafa Ertürk; Ali Keçebaş. 2021. "Prediction of the effect of insulation thickness and emission on heating energy requirements of cities in the future." Sustainable Cities and Society 75, no. : 103270.
In this study, a newly system is designed and tested which integrates air-to-water heat pump and solar air collector having fabric absorber for the shortcoming of frost depositing on the evaporator in heating condition. Thus, it can achieve synchronous and heat exchange in one integrated system between R410A, gaseous and liquid heat source. In addition, the system performance is evaluated in comparison with those of the standard heat pump and the flat-plate solar air collector assisted heat pump under the same climatic conditions. In this respect, experimental tests are performed for winter season and the thermodynamic inefficiencies’ changes are monitored by real-time exergy analysis under climate conditions of the Muğla province/Turkey. This approximation allows the designer and the manufacturer to see the progress. The results of the study indicate that the textile based solar air collector assisted heat pump shows superior performance with 5.11 COP and 56% exergy efficiency when compared to the other two heat pumps. The equipment with the highest exergy destruction is determined as evaporator. In low temperatures, the problem of frost depositing on the evaporator is solved faster with the use of solar air collector. With the use of a textile-based solar air collector on heat pump, the electrical consumption of the compressor is reduced by 8.3%. Consequently, the proposed system clearly demonstrated its applicability as an independent and reliable system for the building heating process due to its benefits like energy saving, protection against environmental conditions and evaporator’ anti-frost deposit behavior.
Tolga Ural; Ali Keçebaş; Onur Vahip Güler. Thermodynamic performance evaluation of a heat pump system with textile based solar air heater for heating process. Applied Thermal Engineering 2021, 191, 116905 .
AMA StyleTolga Ural, Ali Keçebaş, Onur Vahip Güler. Thermodynamic performance evaluation of a heat pump system with textile based solar air heater for heating process. Applied Thermal Engineering. 2021; 191 ():116905.
Chicago/Turabian StyleTolga Ural; Ali Keçebaş; Onur Vahip Güler. 2021. "Thermodynamic performance evaluation of a heat pump system with textile based solar air heater for heating process." Applied Thermal Engineering 191, no. : 116905.
Binary geothermal power plants (GPP) always attract researchers’ attention as they are renewable-energy operated, low-temperature, high-performance, environmentally-friendly, and baseload power plants. In addition, they need to be monitored, controlled and optimized due to their complex structure and functioning. This article presents the application of the Simulated Annealing (SA) algorithm for the thermodynamic performance optimization on the verified thermodynamic model of the SINEM GPP operating in Aydın, Turkey. This algorithm is also compared to the Gravitational Search Algorithm (GSA). By using these methods, 17 optimization parameters in the plant model are simultaneously optimized for maximum exergy efficiency. Study results show that the exergy analysis, gravitational search algorithm and simulated annealing algorithm respectively determined the exergy efficiency of the plant as 14.48%, 30.62%, and 38.49%. The SA algorithm has a better performance compared to the other two methods. System components such as condensers, vaporizers, and pumps are made more efficient using the SA algorithm. In addition, the most effective parameters of the plant are evaporator pressure differences and the mass flow of ORC’s working fluid. By using GSA and SA algorithm, the gross electricity generation in the power plant can be increased by 2.11 MW and 3.15 MW, respectively. While GSA uses the procedure of reducing the amount of component exergy destruction, the SA algorithm uses the procedure of reducing the amount of electricity spent in the operation of the plant equipment. The rate of non-condensing gas (NCG) outlet, which is harmful to the environment, can be reduced by using SA algorithm. In this way, a power plant can be operated more economically and in a more environmentally friendly manner.
Gürcan Çetin; Ali Keçebaş. Optimization of thermodynamic performance with simulated annealing algorithm: A geothermal power plant. Renewable Energy 2021, 172, 968 -982.
AMA StyleGürcan Çetin, Ali Keçebaş. Optimization of thermodynamic performance with simulated annealing algorithm: A geothermal power plant. Renewable Energy. 2021; 172 ():968-982.
Chicago/Turabian StyleGürcan Çetin; Ali Keçebaş. 2021. "Optimization of thermodynamic performance with simulated annealing algorithm: A geothermal power plant." Renewable Energy 172, no. : 968-982.
In this study, advanced exergoeconomic analysis is performed for a gas turbine cycle located in Inchon/South Korea. In addition, an approach combining advanced exergy analysis with modified productive structure analysis is applied to the system and the results are compared. Both methods showed that higher part of exergy destruction cost rate for overall system was unavoidable. The investment cost rate of system equipment was also unavoidable. Avoidable exergy destruction cost rate was higher than unavoidable part only for gas turbine. The exergy destruction cost rates obtained with approach are considerably lower than the results obtained with the advanced exergoeconomic analysis. This situation affected the strategies developed to obtain a cost-effective system for gas turbine. Advanced exergoeconomic analysis proposed reducing the exergy destruction cost rate for gas turbine. However, for gas turbine, the approach proposed reducing the investment cost rate. The sum of exergy destruction cost rate of system equipment was higher than that of overall system in advanced exergoeconomic analysis. However, the exergy destruction cost rate of overall system was equal to the sum of exergy destruction cost rate of system equipment in the approach. Finally, it can be concluded that the results obtained with the approach were more compatible.
Cuneyt Uysal; Ali Keçebaş. Advanced exergoeconomic analysis with using modified productive structure analysis: An application for a real gas turbine cycle. Energy 2021, 223, 120085 .
AMA StyleCuneyt Uysal, Ali Keçebaş. Advanced exergoeconomic analysis with using modified productive structure analysis: An application for a real gas turbine cycle. Energy. 2021; 223 ():120085.
Chicago/Turabian StyleCuneyt Uysal; Ali Keçebaş. 2021. "Advanced exergoeconomic analysis with using modified productive structure analysis: An application for a real gas turbine cycle." Energy 223, no. : 120085.
The control strategy insures the efficiency, increased production and safety in new and complicated energy conversion systems. To this end, a thermodynamic model that simulates a real geothermal power plant is developed, and a new and optimal control strategy to increase exergy efficiency is presented on this model. In this study, real average daily data obtained during 2016 are used to verify the thermodynamic model of Sinem geothermal power plant in Turkey (S-GPP) and its control strategy. Thus, exergy efficiency of the system is maximized even under different and changed conditions by controlling flow rate, pressure and NCG percent content parameters in certain locations of S-GPP. Consequently, a new control strategy based on PID is developed. At the same time, different working conditions are provided by assigning disruptive values to these parameters. The thermodynamic model of S-GPP is used as a test system to demonstrate the efficiency of the proposed control strategy under various operating conditions. The results of the study prove that the model has a good statistical performance in terms of maximum exergy efficiency values. In addition, the proposed PID controller has a better performance compared to manual control, even in the presence of S-GPP. The effectiveness of the proposed control strategy is demonstrated by this case study, in which exergy efficiency of the system increased by 25% and power generation by 23%. Therefore, the proposed control strategy has the potential to create more reliable and controlled systems for geothermal and other power plants.
Gürcan Çetin; Osman Özkaraca; Ali Keçebaş. Development of PID based control strategy in maximum exergy efficiency of a geothermal power plant. Renewable and Sustainable Energy Reviews 2020, 137, 110623 .
AMA StyleGürcan Çetin, Osman Özkaraca, Ali Keçebaş. Development of PID based control strategy in maximum exergy efficiency of a geothermal power plant. Renewable and Sustainable Energy Reviews. 2020; 137 ():110623.
Chicago/Turabian StyleGürcan Çetin; Osman Özkaraca; Ali Keçebaş. 2020. "Development of PID based control strategy in maximum exergy efficiency of a geothermal power plant." Renewable and Sustainable Energy Reviews 137, no. : 110623.
It is noteworthy that energy consumption is very high in hotels in order to provide the comfort requirements of human beings. Especially in summer season, cooling is an important condition for comfort in a hotel. In hotel cooling, seawater is an indispensable heat sink. In this study, the thermodynamic performance of a hotel cooling system with seawater‐source and heat pump used with the aim of cooling a hotel located by sea is investigated. Using hourly data collected from the existing system during the summer of 2016, exergy analysis is performed. As the cooling system is at an industrial‐scale involving copious equipments, it is divided into 5 different cooling zones. For cooling of a selected hotel room, the heat pump and variable refrigerant flow system in the zone where the room was located is also assessed. The results indicated that the hotel cooling system has the COP, exergy efficiency and improvement potential of 4.37, 66.5% and 77.7% on average, respectively. The zone requiring priority improvement is the fifth cooling zone due to air‐conditioning plants and long pipelines. The equipment with the highest exergy destruction is the seawater heat exchanger. Due to low temperature difference between hotel room and seawater, it is necessary to increase use of these systems and develop them in terms of technology.
Tolga Ural; Ali Keçebaş; Ömer Saçkan. Experimental thermodynamic evaluation of a real cooling system with seawater‐source and heat pump for a hotel in Turkey. Environmental Progress & Sustainable Energy 2020, 39, 1 .
AMA StyleTolga Ural, Ali Keçebaş, Ömer Saçkan. Experimental thermodynamic evaluation of a real cooling system with seawater‐source and heat pump for a hotel in Turkey. Environmental Progress & Sustainable Energy. 2020; 39 (6):1.
Chicago/Turabian StyleTolga Ural; Ali Keçebaş; Ömer Saçkan. 2020. "Experimental thermodynamic evaluation of a real cooling system with seawater‐source and heat pump for a hotel in Turkey." Environmental Progress & Sustainable Energy 39, no. 6: 1.
Ali Kecebas. Thermodynamic Optimization of Turbine Lines for Maximum Exergy Efficiency in a Binary Geothermal Power Plant. Hittite Journal of Science & Engineering 2019, 6, 07 -15.
AMA StyleAli Kecebas. Thermodynamic Optimization of Turbine Lines for Maximum Exergy Efficiency in a Binary Geothermal Power Plant. Hittite Journal of Science & Engineering. 2019; 6 (1):07-15.
Chicago/Turabian StyleAli Kecebas. 2019. "Thermodynamic Optimization of Turbine Lines for Maximum Exergy Efficiency in a Binary Geothermal Power Plant." Hittite Journal of Science & Engineering 6, no. 1: 07-15.
The limited energy resources globally, low efficiency of renewable energies, complicated and costly energy conversion systems and environmental pollution have significantly increased scholar’s interest in innovative and efficient systems and their improvement studies. Therefore, it is necessary to increase the efficiency of power generation systems used in geothermal sources of medium or low enthalpy. This study aims to improve the thermodynamic performance of an existing binary geothermal system with organic Rankine cycle and its system components while trying to comprehend the physical events/changes during these improvement processes. A model has been developed that simulates the system completely and accurately. Seventeen system parameters which were considered as crucial to maximize the exergy efficiency of the system like turbine inlet, condenser temperature and so on, are optimized using a gravitational search algorithm. The results of the study show that the exergy efficiency of the system is 14% and thus it can be maximized to 31% with optimization. During the optimization process, the pressure of work fluid on the evaporator line is increased and thus 2.1 MW more power is produced compared to normal power production. The condenser, with the highest exergy destruction in the system, has performance improvements of 75%. As a result, with the optimization process, a more compatible operating strategy between system components is ensured. This will allow the system and its components to run for longer and without failures.
Osman Özkaraca; Ali Keçebaş. Performance analysis and optimization for maximum exergy efficiency of a geothermal power plant using gravitational search algorithm. Energy Conversion and Management 2019, 185, 155 -168.
AMA StyleOsman Özkaraca, Ali Keçebaş. Performance analysis and optimization for maximum exergy efficiency of a geothermal power plant using gravitational search algorithm. Energy Conversion and Management. 2019; 185 ():155-168.
Chicago/Turabian StyleOsman Özkaraca; Ali Keçebaş. 2019. "Performance analysis and optimization for maximum exergy efficiency of a geothermal power plant using gravitational search algorithm." Energy Conversion and Management 185, no. : 155-168.
The use of effective insulation methods to reduce heat loss and minimize its economic and environmental effects in city piping systems is an important topic globally. This study uses a new method for insulation of city piping systems of an air gap around pipelines and optimizes the thickness of insulation for the pipe. With this aim, a mathematical model based on heat degree days and life cycle cost analysis is used. Thus, according to the insulation thickness, air gap and pipe diameter values, the objective functions of optimum insulation thickness, energy cost savings, and payback period are comparatively assessed. The results indicate that using an air gap causes an 89% and 57% fall in optimum insulation thickness values for small and large diameter pipes, respectively. Additionally, sensitivity analysis was completed for the objective functions in terms of parameters such as interest rate, discount rate, life span, unit cost of fuel, cost of insulation material per unit volume, heat degree day, and air gap values. Based on the study methodology, life span, air gap, and unit fuel cost parameters were shown to have a significant effect on the objective functions. When insulation with air gap is applied, together with reducing the optimum insulation thickness at least 72% (from 0.009 to 0.031 m), it increases energy cost savings at 74% (from 5.47 to 21 $/m‐yr) for large diameter pipes and reduces the payback period at 78% (from 0.1 to 0.04 yr‐m) for small diameter pipes. © 2019 American Institute of Chemical Engineers Environ Prog, 2019
Tolga Ural; Ali Daşdemir; Ali Keçebaş. Sensitivity Analysis of Optimum Insulation Thickness for Pipe Diameters in Pipe Insulation with Air Gap for City Pipelines. Environmental Progress & Sustainable Energy 2019, 38, 1 .
AMA StyleTolga Ural, Ali Daşdemir, Ali Keçebaş. Sensitivity Analysis of Optimum Insulation Thickness for Pipe Diameters in Pipe Insulation with Air Gap for City Pipelines. Environmental Progress & Sustainable Energy. 2019; 38 (5):1.
Chicago/Turabian StyleTolga Ural; Ali Daşdemir; Ali Keçebaş. 2019. "Sensitivity Analysis of Optimum Insulation Thickness for Pipe Diameters in Pipe Insulation with Air Gap for City Pipelines." Environmental Progress & Sustainable Energy 38, no. 5: 1.
Baris Gurel; Osman Ipek; Yusuf Basogul; Ali Kecebas. Optimization of Nozzle Section in Plastic Injection Moulding Process. Hittite Journal of Science & Engineering 2019, 6, 123 -130.
AMA StyleBaris Gurel, Osman Ipek, Yusuf Basogul, Ali Kecebas. Optimization of Nozzle Section in Plastic Injection Moulding Process. Hittite Journal of Science & Engineering. 2019; 6 (2):123-130.
Chicago/Turabian StyleBaris Gurel; Osman Ipek; Yusuf Basogul; Ali Kecebas. 2019. "Optimization of Nozzle Section in Plastic Injection Moulding Process." Hittite Journal of Science & Engineering 6, no. 2: 123-130.
In this study, the thermodynamic performance of a binary geothermal power plant (GPP) is comparatively evaluated using the exergy analysis and optimization method. Thus, in addition to routes to improve the thermodynamic performance of the system, the thermodynamic relationships between the system components and improvement performances of the components are determined. With this aim, the Sinem GPP located in Aydın province in Turkey as a real system is selected. All data from the system are collected and a numerical model simulating the real system is developed. On the developed model, the conventional and advanced exergy analyses for exergy analysis and the artificial bee colony (ABC) method for optimization process are performed. The results of the study show that total exergy efficiencies of the conventional exergy analysis, advanced exergy analysis and artificial bee colony are determined as 39.1%, 43.1% and 42.8%, respectively. The exergy efficiency obtained from advanced exergy analysis is higher compared to the other two methods. This is due to the fact that theoretical and unavoidable operation assumptions in advanced exergy analysis are arbitrary as a single value depending on the decision maker. However, decision variables in the ABC method are within certain constraints chosen by the decision maker. It is better to select constraint limits instead of an arbitrary single value selection. Therefore, its arbitrary values should be confirmed with any optimization method. Additionally, the highest exergy destruction identified in the three methods is occurred in heat exchangers as the condenser and vaporizer.
Osman Özkaraca; Ali Keçebaş; Cihan Demircan. Comparative thermodynamic evaluation of a geothermal power plant by using the advanced exergy and artificial bee colony methods. Energy 2018, 156, 169 -180.
AMA StyleOsman Özkaraca, Ali Keçebaş, Cihan Demircan. Comparative thermodynamic evaluation of a geothermal power plant by using the advanced exergy and artificial bee colony methods. Energy. 2018; 156 ():169-180.
Chicago/Turabian StyleOsman Özkaraca; Ali Keçebaş; Cihan Demircan. 2018. "Comparative thermodynamic evaluation of a geothermal power plant by using the advanced exergy and artificial bee colony methods." Energy 156, no. : 169-180.
Hilmi Cenk Bayrakçı; Cihan Demircan; Ali Keçebaş. The development of empirical models for estimating global solar radiation on horizontal surface: A case study. Renewable and Sustainable Energy Reviews 2018, 81, 2771 -2782.
AMA StyleHilmi Cenk Bayrakçı, Cihan Demircan, Ali Keçebaş. The development of empirical models for estimating global solar radiation on horizontal surface: A case study. Renewable and Sustainable Energy Reviews. 2018; 81 ():2771-2782.
Chicago/Turabian StyleHilmi Cenk Bayrakçı; Cihan Demircan; Ali Keçebaş. 2018. "The development of empirical models for estimating global solar radiation on horizontal surface: A case study." Renewable and Sustainable Energy Reviews 81, no. : 2771-2782.
Geothermal energy is a renewable form of energy, however due to misuse, processing and management issues, it is necessary to use the resource more efficiently. To increase energy efficiency, energy systems engineers carry out careful energy control studies and offer alternative solutions. With this aim, this study was conducted to improve the performance of a real operating air-cooled organic Rankine cycle binary geothermal power plant (GPP) and its components in the aspects of thermodynamic modeling, exergy analysis and optimization processes. In-depth information is obtained about the exergy (maximum work a system can make), exergy losses and destruction at the power plant and its components. Thus the performance of the power plant may be predicted with reasonable accuracy and better understanding is gained for the physical process to be used in improving the performance of the power plant. The results of the exergy analysis show that total exergy production rate and exergy efficiency of the GPP are 21 MW and 14.52%, respectively, after removing parasitic loads. The highest amount of exergy destruction occurs, respectively, in condenser 2, vaporizer HH2, condenser 1, pumps 1 and 2 as components requiring priority performance improvement. To maximize the system exergy efficiency, the artificial bee colony (ABC) is applied to the model that simulates the actual GPP. Under all the optimization conditions, the maximum exergy efficiency for the GPP and its components is obtained. Two of these conditions such as Case 4 related to the turbine and Case 12 related to the condenser have the best performance. As a result, the ABC optimization method provides better quality information than exergy analysis. Based on the guidance of this study, the performance of power plants based on geothermal energy and other energy resources may be improved.
Osman Özkaraca; Pınar Keçebaş; Cihan Demircan; Ali Keçebaş. Thermodynamic Optimization of a Geothermal- Based Organic Rankine Cycle System Using an Artificial Bee Colony Algorithm. Energies 2017, 10, 1691 .
AMA StyleOsman Özkaraca, Pınar Keçebaş, Cihan Demircan, Ali Keçebaş. Thermodynamic Optimization of a Geothermal- Based Organic Rankine Cycle System Using an Artificial Bee Colony Algorithm. Energies. 2017; 10 (11):1691.
Chicago/Turabian StyleOsman Özkaraca; Pınar Keçebaş; Cihan Demircan; Ali Keçebaş. 2017. "Thermodynamic Optimization of a Geothermal- Based Organic Rankine Cycle System Using an Artificial Bee Colony Algorithm." Energies 10, no. 11: 1691.
Ali Daşdemir; Mustafa Ertürk; Ali Keçebaş; Cihan Demircan. Effects of air gap on insulation thickness and life cycle costs for different pipe diameters in pipeline. Energy 2017, 122, 492 -504.
AMA StyleAli Daşdemir, Mustafa Ertürk, Ali Keçebaş, Cihan Demircan. Effects of air gap on insulation thickness and life cycle costs for different pipe diameters in pipeline. Energy. 2017; 122 ():492-504.
Chicago/Turabian StyleAli Daşdemir; Mustafa Ertürk; Ali Keçebaş; Cihan Demircan. 2017. "Effects of air gap on insulation thickness and life cycle costs for different pipe diameters in pipeline." Energy 122, no. : 492-504.
In this study, to enhance the performance of a central heating system, the following tasks were performed on the system via Radio Frequency modems: collection of data, evaluation of the system, real time monitoring, remote control, and management processes. A central heating system testing apparatus and related software and hardware were developed. Both short-time and long-time experiments were conducted. In the experiments, Case 1, in which the system operated under ambient conditions for an hour without remote control, was compared with Case 2, in which the space temperature was kept constant at 21°C. The experimental results indicated that Case 2, in which remote control-based energy management was conducted, resulted in 20 L of fuel savings compared to Case 1, and a 57–60% thermal efficiency was measured. As a result, a central heating system using remote control-based energy management is more efficient, economical, and less harmful to the environment. © 2016 American Institute of Chemical Engineers Environ Prog, 2016
Volkan Şahin; Osman Ipek; Yusuf Başoğul; Barış Gürel; Ali Keçebaş. Remote control-based energy management for energy savings in a central heating system. Environmental Progress & Sustainable Energy 2016, 36, 600 -609.
AMA StyleVolkan Şahin, Osman Ipek, Yusuf Başoğul, Barış Gürel, Ali Keçebaş. Remote control-based energy management for energy savings in a central heating system. Environmental Progress & Sustainable Energy. 2016; 36 (2):600-609.
Chicago/Turabian StyleVolkan Şahin; Osman Ipek; Yusuf Başoğul; Barış Gürel; Ali Keçebaş. 2016. "Remote control-based energy management for energy savings in a central heating system." Environmental Progress & Sustainable Energy 36, no. 2: 600-609.
• Determining optimum insulation thickness (OIT) of a pipe using LCA analysis for the first time. • Comprising the LCC analysis to evaluate accuracy of the LCA analysis in pipe insulation. • The OIT of the LCA analysis are overestimated by up to eight fold from that of the LCC • The LCC analysis should be supported with the LCA analysis for environmental impact reduction. This paper reports on the use of a new method to evaluate the optimal insulation thickness according to life cycle assessment (LCA) in pipe insulation applications. In this study, the optimum insulation thickness in the pipes is analysed based on two different methods (life cycle assessment - LCA and life cycle cost - LCC) used to determine the optimum insulation thickness for the environmental impact reduction of pipe insulation. Thus, the LCC analysis is used to evaluate the accuracy of this new method; data are collected from the insulation and energy markets, and the results are compared. The effects on the environmental and cost parameters of insulation thickness are also discussed in detail. The results indicate that the total environmental impacts are almost the same values in both methods, while the optimum insulation thickness is overestimated by up to eight-fold in the LCA analysis. As a result, the LCC analysis can be used in the determination of the optimum insulation thickness; however, it must be supported with the LCA analysis for environmental impact reduction.
Yusuf Başoğul; Cihan Demircan; Ali Keçebaş. Determination of optimum insulation thickness for environmental impact reduction of pipe insulation. Applied Thermal Engineering 2016, 101, 121 -130.
AMA StyleYusuf Başoğul, Cihan Demircan, Ali Keçebaş. Determination of optimum insulation thickness for environmental impact reduction of pipe insulation. Applied Thermal Engineering. 2016; 101 ():121-130.
Chicago/Turabian StyleYusuf Başoğul; Cihan Demircan; Ali Keçebaş. 2016. "Determination of optimum insulation thickness for environmental impact reduction of pipe insulation." Applied Thermal Engineering 101, no. : 121-130.
Energy sources are of great importance in relation to pollution of the world. The use of renewable energy resources and the creation of more efficient energy systems make great contributions to the prevention of greenhouse gases. Recently, many studies indicate that the energy conversion systems have many advantages in terms of technical and economic point of view. In near future, environmental impact is going to play an important role in the selection/design of such energy resources and systems. In this study, the Afyon GDHS (geothermal district heating system) having actual operating conditions is investigated at the component level in terms of environmental impact by using exergoenvironmental analysis. Moreover, the effects of ambient and wellhead temperatures on the environmental impacts of the system are discussed. The results show that a great part of total environmental impact of the system occurs from the exergy destructions of the components. Therefore, the environmental impacts can be reduced by improving their exergetic efficiencies instead of design changes of the system components. The environmental impacts of the system are reduced when the ambient temperature decreases and the wellhead temperature increases. Thus, it might not be necessary to conduct separately the exergoenvironmental analysis for different ambient temperatures.
Ali Keçebaş. Exergoenvironmental analysis for a geothermal district heating system: An application. Energy 2016, 94, 391 -400.
AMA StyleAli Keçebaş. Exergoenvironmental analysis for a geothermal district heating system: An application. Energy. 2016; 94 ():391-400.
Chicago/Turabian StyleAli Keçebaş. 2016. "Exergoenvironmental analysis for a geothermal district heating system: An application." Energy 94, no. : 391-400.
Ali Keçebaş; Harun Gökgedik. Thermodynamic evaluation of a geothermal power plant for advanced exergy analysis. Energy 2015, 88, 746 -755.
AMA StyleAli Keçebaş, Harun Gökgedik. Thermodynamic evaluation of a geothermal power plant for advanced exergy analysis. Energy. 2015; 88 ():746-755.
Chicago/Turabian StyleAli Keçebaş; Harun Gökgedik. 2015. "Thermodynamic evaluation of a geothermal power plant for advanced exergy analysis." Energy 88, no. : 746-755.
Her gelişme sürecinde kaliteli insan kaynakları kullanılabilirliği bir gerekliliktir. Gelişmekte olan ülkelerde eksiliğin çok önemli olduğu yenilenebilir enerji alanında da aynen böyledir. Bilim öğretmenin iyi ve kaliteli bilimsel mesleklere başlamanın en iyi yoludur. Bilim ve teknoloji entelektüel seviyede değerleri biçimlendirmek ve yaratıcılık için yeteneklere teşvik etmek için doğa ve çevrenin kavranmasında ve ek olarak çağdaş dünyanın anlaşılmasında vazgeçilmez bir alet olarak görünürler. Enerji çalışmaları yeni bir eğitim yöntemleri olarak ortaya çıkmış ve enerji eğitiminin iki tipi içinde sınıflandırılmıştır. Bunlardan biri, gelişen enerji mesleği üzerine odaklanır ve diğeri ise zorunlu ilköğretim ve orta öğretimden sonra üniversite ve daha ilerisini geçerek enerji bilinçli bir toplumun üretilmesine amaçlamaktadır. Bunu çözmenin en iyi yolu yenilenebilir enerji kaynaklarını kullanmaktır. Bu yol, kalite, yaygınlık, yoğun yenilenebilir enerji eğitimi, mükemmel yenilenebilir enerji araştırmaları ve bunların uygulamaları için yenilenebilir enerji sistemlerinin ülke içinde yayımı ve tüm insanların bilgilendirilmesi gereklidir. Bu çalışmada Türkiye’de eğitimin her çağına uygun eğitim programlarının geliştirilmesi üzerine öneriler ve beklentiler verilmiştir. Ayrıca halk içinde farkındalık programları sunulmuştur
Ali Keçebaş; Mehmet Alkan. TÜRKİYE’DE SÜRDÜRÜLEBİLİR GELİŞME İÇİN YENİLENEBİLİR ENERJİ KAYNAKLARININ EĞİTİMİ VE ÖĞRETİMİ. Mugla Journal of Science and Technology 2015, 1, 1 -1.
AMA StyleAli Keçebaş, Mehmet Alkan. TÜRKİYE’DE SÜRDÜRÜLEBİLİR GELİŞME İÇİN YENİLENEBİLİR ENERJİ KAYNAKLARININ EĞİTİMİ VE ÖĞRETİMİ. Mugla Journal of Science and Technology. 2015; 1 (1):1-1.
Chicago/Turabian StyleAli Keçebaş; Mehmet Alkan. 2015. "TÜRKİYE’DE SÜRDÜRÜLEBİLİR GELİŞME İÇİN YENİLENEBİLİR ENERJİ KAYNAKLARININ EĞİTİMİ VE ÖĞRETİMİ." Mugla Journal of Science and Technology 1, no. 1: 1-1.
District heating system (DHS), especially geothermal, is an important class of heating, ventilating, and air conditioning systems. This is due to the fact that in many countries and regions of the world, they have been successfully installed and operated, resulting in great economic savings. In recent years, such systems have received much attention with regard to improving their energy efficiency, equipment operation, and investment cost. Improvement in performance of a geothermal district heating system (GDHS) is a very effective mean to decrease energy consumption and to provide energy saving. To perform the potential energy savings in a GDHS, the advanced exergoeconomic analysis is applied to a real GDHS in the city of Afyon/Turkey. Then, it is evaluated based on the concepts of exergy destruction cost and investment cost. The results show that the advanced exergoeconomic analysis makes the information more accurate and useful and supplies additional information that cannot be provided by the conversional analysis. Furthermore, the Afyon GDHS can be made more cost effectiveness, removing the system components’ irreversibilities, technical-economic limitations, and poorly chosen manufacturing methods.
Harun Gökgedik; Veysel Incili; Halit Arat; Ali Keçebaş. Assessment of Total Operating Costs for a Geothermal District Heating System. Springer Proceedings in Energy 2015, 293 -303.
AMA StyleHarun Gökgedik, Veysel Incili, Halit Arat, Ali Keçebaş. Assessment of Total Operating Costs for a Geothermal District Heating System. Springer Proceedings in Energy. 2015; ():293-303.
Chicago/Turabian StyleHarun Gökgedik; Veysel Incili; Halit Arat; Ali Keçebaş. 2015. "Assessment of Total Operating Costs for a Geothermal District Heating System." Springer Proceedings in Energy , no. : 293-303.