Arif Karabuga | T.C. Haliç Üniversitesi (original) (raw)
Papers by Arif Karabuga
International Journal of Global Warming, 2021
International Journal of Hydrogen Energy, Jul 1, 2023
International journal of applied thermodynamics, Aug 29, 2021
In this paper, the thermodynamic performance of a boroxide-added glass evacuated tube heat pipe (... more In this paper, the thermodynamic performance of a boroxide-added glass evacuated tube heat pipe (ETHP) is studied, including energy, exergy, environmental, economic analysis, and sustainability index. It has been found that 50,87% of the energy loss of water and 50,86% of the exergy loss of water are caused by radiation. There are 4 collectors each collector 57 pipes as a total of 108 pieces pipes, a hot water tank, a heat exchanger, and a pump in the system. The water is used as a working fluid due to economic and common use in the system. In the result of this experimental study, we calculated energy and exergy efficiencies of the EHTP system as % 22,21 and % 13,68, respectively. In addition, the environmental, exergoenviromental, enviroeconomic, and exergoenviroeconomic values of the EHTP system are found 458,5 kgCO2/day, 456,5 kgCO2/day, 0,003708 /dayand0.003692/day and 0.003692 /dayand0.003692/day, respectively. Also, the sustainability index of the system is found as 1,159.
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy
34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2021), 2022
This study aimed to investigate the importance of renewable energy sources usage in tourism which... more This study aimed to investigate the importance of renewable energy sources usage in tourism which has a significant market power in world economy. Tourism has a big contribution to regional development and also some cons on environmental issues. To reduce the negative aspects on environment and increase the financial savings of tourism industry, renewable energy has a vital priority. Renewable energy will align the hotel areas with concept of green tourism. Financial savings through this energy also has been provided in that study. This paper also suggests an analysis for suitable sources of renewable energy usage in hotels with a sample practice.
Parcacik hizlandiricilarda ve carpistiricilarda, elektron hizlandiricilarda, tip disiplininde, me... more Parcacik hizlandiricilarda ve carpistiricilarda, elektron hizlandiricilarda, tip disiplininde, metallerin islemede, gidalarin dondurulmasinda ve kimya endustrisinde sivi azot kullanilmaktadir. Hava cesitli bilesenlerden olusur ve dominant olan uc bilesen ise; azot, oksijen ve argondur. Havanin en onemli bileseni azottur. Bu sebepten dolayi azotun ayristirilmasi ve sivilastirilmasi buyuk onemi vardir. Hava ayirma yontemleri temel olarak uc farkli metotla yapilmaktadir. Bu yontemlerden biri kriyojenik ayristirmadir. Bu calismada hava ayristirma unitesine entegre edilmis azot sivilastirma unitesi incelenmistir. Yapilan termodinamik hesaplamalarda azot sivilastirma cevriminin COPgercek ve COPtersinir degerleri hesaplanmistir.
Lighting, heating, transport, industrial output: without energy we would have none of these essen... more Lighting, heating, transport, industrial output: without energy we would have none of these essential day-to-day services without which we and our businesses cannot function. Renewable energy refers to natural energy resource (solar, wind, biogas, tidal, geothermal, etc.) alternatives to fossil and nuclear fuels. All renewable energy sources like solar, wind, geothermal, hydropower, and wave and tidal power are forms of sustainable energy. Solar energy is the most important part of the renewable energy resources such that it is an essential building block for our future global sustainable energy system. Solar energy technologies are divided into two groups: photovoltaic power systems and thermal power systems. The linear Fresnel reflector (LFR) is a thermal power system. The LFR collects the sun's rays through reflective surfaces and then transfers the energy to the fluid in the receiver located at the focal point. The heated fluid is provided with thermal energy conversion than...
Nitrogen, oxygen, and argon are the basic components of air. These components are separated accor... more Nitrogen, oxygen, and argon are the basic components of air. These components are separated according to the difference in their boiling temperatures and their components are liquefied by the cryogenic method. Cryogenics is the science of very low temperatures. Conventionally, the field of cryogenics deals with temperatures below 120 K. Cryogenic air separation is the main method for separating air into its components. Nitrogen is used in the chemical industry, frozen food, medical purposes, particle accelerators, colliders, synchrotrons, metal processing technology, etc. This study examined a real nitrogen liquefaction unit. The nitrogen liquefaction unit was integrated with an air separation unit. Nitrogen provided by air separation created the source for the liquefaction unit. Energy and exergy analyses of the studied nitrogen liquefaction unit were performed. For numerical calculations and graphics, Equation Engineering Solver software was used. In the results of thermodynamic c...
International Journal of Hydrogen Energy, 2021
Background: Right hepatectomy (RH) is the most common type of major hepatectomy and can be achiev... more Background: Right hepatectomy (RH) is the most common type of major hepatectomy and can be achieved without portal triad clamping (PTC) in non-cirrhotic liver. The present study reviews our standardized policy of performing RH without systematic PTC. Methods: One hundred and eighty-one consecutive RH were performed in non-cirrhotic patients, with division of the right afferent and efferent blood vessels prior to transection, without systematically using PTC. Prospectively collected data were analysed, focusing on the following endpoints: need for salvage PTC, ischaemic time, blood loss and post-operative outcome. Results: Extra-hepatic division of the right hepatic vessels was feasible in all patients, but was ineffective in 48 patients (26.5%) who required salvage PTC during transection. In those patients, the median ischaemic time was 20 min. The median blood loss was 500 ml (50-3000). Six patients (3.3%) experienced post-operative liver failure. Overall morbidity, severe morbidity and mortality were 42%, 12.1% and 1.6%, respectively, with peri-operative transfusion rate (16.6%) being the only factor associated with morbidity. Discussion: By performing RH with extra-hepatic vascular division prior to transection, PTC can be safely avoided in the majority of patients.
International Journal of Low-Carbon Technologies, 2020
The present study focuses on the organic Rankine cycle (ORC) integrated into an evacuated tube he... more The present study focuses on the organic Rankine cycle (ORC) integrated into an evacuated tube heat pipe (ETHP), whose systems are an alternative solar energy system to low-efficiency planary collectors. In this work, a detailed thermodynamic and artificial neural network (ANN) analysis was conducted to evaluate the solar energy system. One of the key parameters of sustainable approaches focused on exergy efficiency is application of thermal engineering. In addition to this, sustainable engineering approaches nowadays are a necessity for improving the efficiency of all of the engineering research areas. For this reason, the ANN model is used to forecast different types of energy efficiency problems in thermodynamic literature. The examined system consists of two main parts such as the ETHP system and the ORC system used for thermal energy production. With this system, it is aimed to evaluate energy and exergy analysis results by the ANN method in the case of integrating the ORC syst...
Procedia Computer Science, 2019
With the increasing concern on the environment and climate change, scientists focused on the way ... more With the increasing concern on the environment and climate change, scientists focused on the way in which new structures, especially in the field of energy. In this sense, the concept of sustainable buildings is developing day by day in terms of energy efficiency. The sustainable building concept identifies five objectives which are resource efficiency, energy efficiency, prevention of pollution, harmonization with the environment; and also using integrated and systemic approaches. To increase energy efficiency in buildings, the integration of Solar Energy Systems into buildings attaches importance in terms of sustainable engineering designs. Evacuated Tube Heat Pipe (ETHP) solar energy systems are also noteworthy in this regard. This paper presents the results of an experimental study that is an ETHP solar collector system. ETHP systems are an alternative solar energy system to low-efficiency planary collectors. Only water was used to avoid losses in the heat transfer from the fluid to the fluid. Water is inserted in the vacuum tube in order to improve the rate of heat transfer, such that the mode of heat transfer from the inner surface of the vacuum tube to the heat pipe becomes convection via the water, as well as conduction through the installed. The exergy efficiency of the ETHP system was calculated as 32.94%. For a long time, artificial neural networks (ANN) have been widely applied in energy efficiency for modeling and optimization of various processes. In the field of processing, recent studies confirm the validity and effectiveness of using ANNs as promising and most powerful computer modeling techniques. Within the scope of this study, exergy efficiency was evaluated on the developed Artificial Neural Network algorithm. The effect rates of parameters such as pressure, temperature, and ambient temperature affecting exergy efficiency were calculated. Finally, significant findings obtained were evaluated in terms of thermodynamics rules.
International Journal of Exergy, 2019
Energy consumption in the world is increasing day by day. In addition to diversifying energy reso... more Energy consumption in the world is increasing day by day. In addition to diversifying energy resources, it is also important to reduce energy consumption. In order to find the actual consumption of a thermodynamic system, energy efficiency as well as exergy efficiency should be done. The purpose of this study is to determine the parameters affecting the exergy efficiency of the cryogenic liquefaction unit integrated into a real cryogenic air separation unit. Cryogenic liquefaction is one of the basic processes between liquefaction methods. In addition to this process, absorption and membrane are used in methods. The main difference in the selection of these methods is the desired purity rates. Cryogenes are defined as fluids used in cryogenic cooling. In this study, five different cryogenes in the air are investigated. The energy and exergy analysis of the liquefaction unit for each cryogen is made. As a result of the study, the highest COP actual value is obtained with 0.3105 hydrogen fluid and the highest COP rev value with 0.8551 oxygen. Exergy of the system is found as 0.48 with hydrogen.
34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2021), 2022
International Journal of Hydrogen Energy
SOLR-03 This study presents a thermal solar technologies as linear fresnel reflector (LFR), one o... more SOLR-03 This study presents a thermal solar technologies as linear fresnel reflector (LFR), one of the focused solar energy systems is investigated. This system is evaluated under the 4E assessment criteria; Energy, Exergy, Economic and Environment. The energy, exergy, environmental, enviroeconomic, exergoenvironmental, exergoenviroeconomical analysis and sustainability index of the LFR system is calculated. In addition, energy and exergy losses due to convection and radiation coming from the LFR system is found. If the ambient temperature of the LFR system is 293 K, the energy, exergy, environmental, enviroeconomic, exergoenvironmental, exergenviroeconomic analysis and sustainable index order are 40 %, 1.5617 %, 0.208015 kgCO2 /day, 0.003016 /day,0.19447kgCO2/day,0.0028199/day, 0.19447 kgCO2 / day, 0.0028199 /day,0.19447kgCO2/day,0.0028199/day and 1.015 respectively, and the sustainability index of this study was found as 1.015.
EXGY-02 This study present the solar exergy map of Turkey has developed. Both thermal and electri... more EXGY-02 This study present the solar exergy map of Turkey has developed. Both thermal and electrical examples have been made for how the solar exergy map is implemented and for solar energy applications. Based on the exergy of solar radiation, the efficiency of photovoltaic systems for electrical production and Linear Fresnel reflector (LFR) systems for thermal power generation is examined in Turkey's climatic conditions. In the study, four different cities are investigated. In the study, solar exergy efficiency is calculated for seven different cities, Isparta, Bursa, İzmir, Sinop, Ankara, Iğdır and Şanlıurfa. As a result of the calculations, the efficiency of solar eclipse for Isparta, Bursa, İzmir, Sinop, Ankara, Iğdır and Şanlıurfa was found to be 12.91%, 12.92%, 11.65 %, 14.48%, 13.09%, 12.27% and 10.21% respectively.
Sustainable engineering approaches are a necessity for improving efficiency. For this reason, the... more Sustainable engineering approaches are a necessity for improving efficiency. For this reason, the artificial neural network (ANN) model is used to forecast different types of energy efficiency problems. In this paper, a comparison is made between a simple model based on ANN which gives meaningful findings in terms of thermodynamics and a model that is based on thermodynamic principles as auditing and predicting tool to forecast exergy efficiency of the system by applying different ANN architecture types with 441 data of experimental measurements obtained from liquefied nitrogen and analysed the Engineering Equation Solver (EES) program to make an exergy analysis.
International Journal of Exergy, 2021
Argon basically and widely liquefied by three different liquefaction methods such as cryogenic, p... more Argon basically and widely liquefied by three different liquefaction methods such as cryogenic, pressure swing adsorption, and membrane. The cryogenic method with the highest purity rate constitutes the method of this study. In the present work, conventional and enhanced exergy analyses were applied to the liquefaction process of argon. In the enhanced exergy analysis, splitting the exergy destruction into endogenous/exogenous and avoidable/unavoidable parts represents a new direction. In the study, forward exergy analysis is performed for each component and endogenous, exogenous, unavoidable, and avoidable values of these components were calculated. When the convectional exergy analysis is examined, the exergy efficiency of the argon liquefaction system is calculated as 51.77%. When the enhanced exergy analysis of the system is examined, it is found that the highest exergy destruction occurred in the turbine as 614.3 kW. Furthermore, the highest endogenous exergy destruction was fo...
International Journal of Global Warming, 2021
International Journal of Hydrogen Energy, Jul 1, 2023
International journal of applied thermodynamics, Aug 29, 2021
In this paper, the thermodynamic performance of a boroxide-added glass evacuated tube heat pipe (... more In this paper, the thermodynamic performance of a boroxide-added glass evacuated tube heat pipe (ETHP) is studied, including energy, exergy, environmental, economic analysis, and sustainability index. It has been found that 50,87% of the energy loss of water and 50,86% of the exergy loss of water are caused by radiation. There are 4 collectors each collector 57 pipes as a total of 108 pieces pipes, a hot water tank, a heat exchanger, and a pump in the system. The water is used as a working fluid due to economic and common use in the system. In the result of this experimental study, we calculated energy and exergy efficiencies of the EHTP system as % 22,21 and % 13,68, respectively. In addition, the environmental, exergoenviromental, enviroeconomic, and exergoenviroeconomic values of the EHTP system are found 458,5 kgCO2/day, 456,5 kgCO2/day, 0,003708 /dayand0.003692/day and 0.003692 /dayand0.003692/day, respectively. Also, the sustainability index of the system is found as 1,159.
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy
34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2021), 2022
This study aimed to investigate the importance of renewable energy sources usage in tourism which... more This study aimed to investigate the importance of renewable energy sources usage in tourism which has a significant market power in world economy. Tourism has a big contribution to regional development and also some cons on environmental issues. To reduce the negative aspects on environment and increase the financial savings of tourism industry, renewable energy has a vital priority. Renewable energy will align the hotel areas with concept of green tourism. Financial savings through this energy also has been provided in that study. This paper also suggests an analysis for suitable sources of renewable energy usage in hotels with a sample practice.
Parcacik hizlandiricilarda ve carpistiricilarda, elektron hizlandiricilarda, tip disiplininde, me... more Parcacik hizlandiricilarda ve carpistiricilarda, elektron hizlandiricilarda, tip disiplininde, metallerin islemede, gidalarin dondurulmasinda ve kimya endustrisinde sivi azot kullanilmaktadir. Hava cesitli bilesenlerden olusur ve dominant olan uc bilesen ise; azot, oksijen ve argondur. Havanin en onemli bileseni azottur. Bu sebepten dolayi azotun ayristirilmasi ve sivilastirilmasi buyuk onemi vardir. Hava ayirma yontemleri temel olarak uc farkli metotla yapilmaktadir. Bu yontemlerden biri kriyojenik ayristirmadir. Bu calismada hava ayristirma unitesine entegre edilmis azot sivilastirma unitesi incelenmistir. Yapilan termodinamik hesaplamalarda azot sivilastirma cevriminin COPgercek ve COPtersinir degerleri hesaplanmistir.
Lighting, heating, transport, industrial output: without energy we would have none of these essen... more Lighting, heating, transport, industrial output: without energy we would have none of these essential day-to-day services without which we and our businesses cannot function. Renewable energy refers to natural energy resource (solar, wind, biogas, tidal, geothermal, etc.) alternatives to fossil and nuclear fuels. All renewable energy sources like solar, wind, geothermal, hydropower, and wave and tidal power are forms of sustainable energy. Solar energy is the most important part of the renewable energy resources such that it is an essential building block for our future global sustainable energy system. Solar energy technologies are divided into two groups: photovoltaic power systems and thermal power systems. The linear Fresnel reflector (LFR) is a thermal power system. The LFR collects the sun's rays through reflective surfaces and then transfers the energy to the fluid in the receiver located at the focal point. The heated fluid is provided with thermal energy conversion than...
Nitrogen, oxygen, and argon are the basic components of air. These components are separated accor... more Nitrogen, oxygen, and argon are the basic components of air. These components are separated according to the difference in their boiling temperatures and their components are liquefied by the cryogenic method. Cryogenics is the science of very low temperatures. Conventionally, the field of cryogenics deals with temperatures below 120 K. Cryogenic air separation is the main method for separating air into its components. Nitrogen is used in the chemical industry, frozen food, medical purposes, particle accelerators, colliders, synchrotrons, metal processing technology, etc. This study examined a real nitrogen liquefaction unit. The nitrogen liquefaction unit was integrated with an air separation unit. Nitrogen provided by air separation created the source for the liquefaction unit. Energy and exergy analyses of the studied nitrogen liquefaction unit were performed. For numerical calculations and graphics, Equation Engineering Solver software was used. In the results of thermodynamic c...
International Journal of Hydrogen Energy, 2021
Background: Right hepatectomy (RH) is the most common type of major hepatectomy and can be achiev... more Background: Right hepatectomy (RH) is the most common type of major hepatectomy and can be achieved without portal triad clamping (PTC) in non-cirrhotic liver. The present study reviews our standardized policy of performing RH without systematic PTC. Methods: One hundred and eighty-one consecutive RH were performed in non-cirrhotic patients, with division of the right afferent and efferent blood vessels prior to transection, without systematically using PTC. Prospectively collected data were analysed, focusing on the following endpoints: need for salvage PTC, ischaemic time, blood loss and post-operative outcome. Results: Extra-hepatic division of the right hepatic vessels was feasible in all patients, but was ineffective in 48 patients (26.5%) who required salvage PTC during transection. In those patients, the median ischaemic time was 20 min. The median blood loss was 500 ml (50-3000). Six patients (3.3%) experienced post-operative liver failure. Overall morbidity, severe morbidity and mortality were 42%, 12.1% and 1.6%, respectively, with peri-operative transfusion rate (16.6%) being the only factor associated with morbidity. Discussion: By performing RH with extra-hepatic vascular division prior to transection, PTC can be safely avoided in the majority of patients.
International Journal of Low-Carbon Technologies, 2020
The present study focuses on the organic Rankine cycle (ORC) integrated into an evacuated tube he... more The present study focuses on the organic Rankine cycle (ORC) integrated into an evacuated tube heat pipe (ETHP), whose systems are an alternative solar energy system to low-efficiency planary collectors. In this work, a detailed thermodynamic and artificial neural network (ANN) analysis was conducted to evaluate the solar energy system. One of the key parameters of sustainable approaches focused on exergy efficiency is application of thermal engineering. In addition to this, sustainable engineering approaches nowadays are a necessity for improving the efficiency of all of the engineering research areas. For this reason, the ANN model is used to forecast different types of energy efficiency problems in thermodynamic literature. The examined system consists of two main parts such as the ETHP system and the ORC system used for thermal energy production. With this system, it is aimed to evaluate energy and exergy analysis results by the ANN method in the case of integrating the ORC syst...
Procedia Computer Science, 2019
With the increasing concern on the environment and climate change, scientists focused on the way ... more With the increasing concern on the environment and climate change, scientists focused on the way in which new structures, especially in the field of energy. In this sense, the concept of sustainable buildings is developing day by day in terms of energy efficiency. The sustainable building concept identifies five objectives which are resource efficiency, energy efficiency, prevention of pollution, harmonization with the environment; and also using integrated and systemic approaches. To increase energy efficiency in buildings, the integration of Solar Energy Systems into buildings attaches importance in terms of sustainable engineering designs. Evacuated Tube Heat Pipe (ETHP) solar energy systems are also noteworthy in this regard. This paper presents the results of an experimental study that is an ETHP solar collector system. ETHP systems are an alternative solar energy system to low-efficiency planary collectors. Only water was used to avoid losses in the heat transfer from the fluid to the fluid. Water is inserted in the vacuum tube in order to improve the rate of heat transfer, such that the mode of heat transfer from the inner surface of the vacuum tube to the heat pipe becomes convection via the water, as well as conduction through the installed. The exergy efficiency of the ETHP system was calculated as 32.94%. For a long time, artificial neural networks (ANN) have been widely applied in energy efficiency for modeling and optimization of various processes. In the field of processing, recent studies confirm the validity and effectiveness of using ANNs as promising and most powerful computer modeling techniques. Within the scope of this study, exergy efficiency was evaluated on the developed Artificial Neural Network algorithm. The effect rates of parameters such as pressure, temperature, and ambient temperature affecting exergy efficiency were calculated. Finally, significant findings obtained were evaluated in terms of thermodynamics rules.
International Journal of Exergy, 2019
Energy consumption in the world is increasing day by day. In addition to diversifying energy reso... more Energy consumption in the world is increasing day by day. In addition to diversifying energy resources, it is also important to reduce energy consumption. In order to find the actual consumption of a thermodynamic system, energy efficiency as well as exergy efficiency should be done. The purpose of this study is to determine the parameters affecting the exergy efficiency of the cryogenic liquefaction unit integrated into a real cryogenic air separation unit. Cryogenic liquefaction is one of the basic processes between liquefaction methods. In addition to this process, absorption and membrane are used in methods. The main difference in the selection of these methods is the desired purity rates. Cryogenes are defined as fluids used in cryogenic cooling. In this study, five different cryogenes in the air are investigated. The energy and exergy analysis of the liquefaction unit for each cryogen is made. As a result of the study, the highest COP actual value is obtained with 0.3105 hydrogen fluid and the highest COP rev value with 0.8551 oxygen. Exergy of the system is found as 0.48 with hydrogen.
34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2021), 2022
International Journal of Hydrogen Energy
SOLR-03 This study presents a thermal solar technologies as linear fresnel reflector (LFR), one o... more SOLR-03 This study presents a thermal solar technologies as linear fresnel reflector (LFR), one of the focused solar energy systems is investigated. This system is evaluated under the 4E assessment criteria; Energy, Exergy, Economic and Environment. The energy, exergy, environmental, enviroeconomic, exergoenvironmental, exergoenviroeconomical analysis and sustainability index of the LFR system is calculated. In addition, energy and exergy losses due to convection and radiation coming from the LFR system is found. If the ambient temperature of the LFR system is 293 K, the energy, exergy, environmental, enviroeconomic, exergoenvironmental, exergenviroeconomic analysis and sustainable index order are 40 %, 1.5617 %, 0.208015 kgCO2 /day, 0.003016 /day,0.19447kgCO2/day,0.0028199/day, 0.19447 kgCO2 / day, 0.0028199 /day,0.19447kgCO2/day,0.0028199/day and 1.015 respectively, and the sustainability index of this study was found as 1.015.
EXGY-02 This study present the solar exergy map of Turkey has developed. Both thermal and electri... more EXGY-02 This study present the solar exergy map of Turkey has developed. Both thermal and electrical examples have been made for how the solar exergy map is implemented and for solar energy applications. Based on the exergy of solar radiation, the efficiency of photovoltaic systems for electrical production and Linear Fresnel reflector (LFR) systems for thermal power generation is examined in Turkey's climatic conditions. In the study, four different cities are investigated. In the study, solar exergy efficiency is calculated for seven different cities, Isparta, Bursa, İzmir, Sinop, Ankara, Iğdır and Şanlıurfa. As a result of the calculations, the efficiency of solar eclipse for Isparta, Bursa, İzmir, Sinop, Ankara, Iğdır and Şanlıurfa was found to be 12.91%, 12.92%, 11.65 %, 14.48%, 13.09%, 12.27% and 10.21% respectively.
Sustainable engineering approaches are a necessity for improving efficiency. For this reason, the... more Sustainable engineering approaches are a necessity for improving efficiency. For this reason, the artificial neural network (ANN) model is used to forecast different types of energy efficiency problems. In this paper, a comparison is made between a simple model based on ANN which gives meaningful findings in terms of thermodynamics and a model that is based on thermodynamic principles as auditing and predicting tool to forecast exergy efficiency of the system by applying different ANN architecture types with 441 data of experimental measurements obtained from liquefied nitrogen and analysed the Engineering Equation Solver (EES) program to make an exergy analysis.
International Journal of Exergy, 2021
Argon basically and widely liquefied by three different liquefaction methods such as cryogenic, p... more Argon basically and widely liquefied by three different liquefaction methods such as cryogenic, pressure swing adsorption, and membrane. The cryogenic method with the highest purity rate constitutes the method of this study. In the present work, conventional and enhanced exergy analyses were applied to the liquefaction process of argon. In the enhanced exergy analysis, splitting the exergy destruction into endogenous/exogenous and avoidable/unavoidable parts represents a new direction. In the study, forward exergy analysis is performed for each component and endogenous, exogenous, unavoidable, and avoidable values of these components were calculated. When the convectional exergy analysis is examined, the exergy efficiency of the argon liquefaction system is calculated as 51.77%. When the enhanced exergy analysis of the system is examined, it is found that the highest exergy destruction occurred in the turbine as 614.3 kW. Furthermore, the highest endogenous exergy destruction was fo...
One of the most fundamental requirements and the driving force of the economic and social develop... more One of the most fundamental requirements and the driving force of the economic and social development of countries is
energy. Energy sources must be reliable, continuous, clean and cheap. There have been intensive efforts for establishing a
bridge between the energy demand and alternative energy sources in recent years. The increasing need for energy in
tourism causes the increase in the cost of energy expenditures. For this reason, tourism operators benefit from alternative
energy sources in order to reduce energy cost as well as energy saving. In this study, it is aimed to analyse the energy and
exergy efficiencies of a ground source heat pump (GSHP) system. These analyses generated some compelling results as
expected because of the use of environmentally friendly energy sources. In numerical calculations and graphics EES
(Equation Engineering Solver) software are used. The results show that the COP of GSHP system is 3.683 while the exergy
efficiency is 66.49%. Additionally, parametric studies, including the thermodynamic performance of the system and its
components, have been conducted by the change in some operating conditions, as variety of the ambient temperature
changes from 290 K to 330 K.