Article
Thermodynamics
Arman Ekrataleshian, Fathollah Pourfayaz, Mohammad Hossein Ahmadi
Summary: A thermal model for a turbojet engine is proposed in the study, with evaluations of cost flow rate of each component through energetic, exergetic and exergoeconomic analyses. Three operating variables affect the system's performance, leading to a sensitivity analysis to survey their impact on objective functions. Contradictions between exergy efficiency and exergy destruction are found, highlighting the need for optimization.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Eduardo J. C. Cavalcanti, Monica Carvalho
Summary: The article conducted an exergoeconomic assessment for a dual nitrogen expander process used to liquefy natural gas, finding an exergy efficiency of 41.89% and a specific cost of 292.30 US$/GJ for liquefied natural gas. It was identified that the expanders in the system could benefit from a decrease in exergy destruction to improve overall exergoeconomic performance.
Article
Thermodynamics
Hazim Moria, Samira Pourhedayat, Hamed Sadighi Dizaji, Abdullah M. Abusorrah, Nidal H. Abu-Hamdeh, Makatar Wae-hayee
Summary: This research comprehensively studied the economic characteristics of Peltier module as an air cooler through experimental investigation, revealing the variation of economic features under different working conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Mustafa Karagoz, Cuneyt Uysal, Umit Agbulut, Suat Saridemir
Summary: In this study, comprehensive exergetic and exergoeconomic analyses were conducted on a single-cylinder, four-stroke diesel engine. Different nanofuels were tested at varying engine loads, with D90B10Al(2)O(3) showing the highest exergy efficiency and sustainability index values. Al2O3-doped nanofuel emerged as the best test fuel in terms of exergy, exergoeconomics, and sustainability analyzes.
Article
Green & Sustainable Science & Technology
Hasan Caglayan, Hakan Caliskan
Summary: This study focuses on the exergy based economic analysis of a gas turbine cogeneration system for a ceramic tile plant. It is found that the irreversibilities caused by combustion reactions in the combustion chamber and dryers have negative effects on the destructed exergy cost rate. The exergy based economic factor rates of these components are lower than others. The system needs optimization to eliminate the intensive irreversibilities encountered in the components.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Eduardo J. C. Cavalcanti, Diego S. S. Barbosa, Monica Carvalho
Summary: This study presents the exergy assessment of microalgae biodiesel production, revealing that the photobioreactor has the lowest energy efficiency while the dryer has the highest energy efficiency. The findings have significant implications for improving production costs and promoting the widespread adoption of biodiesel.
BIOENERGY RESEARCH
(2023)
Article
Thermodynamics
Amit Kumar Juneja, P. Barnwal, A. K. Sharma, Banashree Naskar, V. K. Ammu
Summary: This study conducted thermodynamic and exergoeconomic analysis of a single-stage spray drying unit for skim milk powder production. The energy and exergy efficiency of the plant were calculated as 89.63% and 49.19%, respectively. The drying chamber and booster pump showed the highest potential for improvement. The drying chamber also had the highest processing cost (percentage relative cost difference: 59.84%), followed by the cyclone separator (percentage relative cost difference: 48.98%). Based on these findings, improvements can be made to the high potential components of the spray drying plant.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Suleyman Simsek, Gursah Guruf, Samet Uslu, Hatice Simsek
Summary: In this study, the exergy, exergoeconomic, enviroeconomic, and sustainability index analyses of biodiesel and diesel blends obtained from waste animal fats were conducted. The experiment utilized a fixed-speed four-stroke, single-cylinder, and air-cooled compression ignition engine operating at engine loads between 500 and 3000 W. The results showed that the highest exergy efficiency, lowest relative cost difference, and maximum sustainability index value were obtained in the D90B10 fuel at a 3000 W engine load. Regarding enviroeconomics, the cost of annual CO2 emission was found to increase with engine load, with D90B10 fuel being closest to D100 fuel at low engine loads.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Physics, Multidisciplinary
Zineb Fergani, Tatiana Morosuk
Summary: This study applies advanced exergy and exergoeconomic analysis to an ORC waste heat recovery system, identifying the evaporator and condenser as key components for improvement. By optimizing the minimum temperature difference, system efficiency can be increased and electricity generation cost can be reduced.
Article
Thermodynamics
Ahmed Alghamdi, Joffin Jose Ponnore, Ahmed M. Hassan, Sultan Alqahtani, Sultan Alshehery, Ali E. Anqi
Summary: The research focuses on the exergetic and economic evaluation of a novel hybrid combined supercritical Brayton Cycle-Organic Rankine Cycle system using solar and biogas as energy sources. Sensitivity analyses were conducted to determine the impact of input characteristics on the system. The study concluded that combining solar PTC system with biogas as an energy source can effectively deliver the desired level of heat to the system.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Wenyi Sun, Ming Li, Zhen Pan, Jingxian Yu, Liyan Shang, Li Zhou, Zhenbo Lv
Summary: In recent years, research on energy-efficient polygeneration systems has been increasing due to concerns about tight energy supply and escalating demand. This study focuses on the utilization of liquefied natural gas (LNG) as a clean fossil fuel for thermodynamic system design. A novel self-supplying thermodynamic system is proposed to recover the cold energy released during LNG gasification, combining power generation and heating systems. Comprehensive evaluations are conducted based on various energy parameters, and optimization algorithms are applied to improve system performance. The results demonstrate the developability of the system and provide valuable insights for designing and optimizing LNG cold energy utilization systems.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Yousaf Ayub, Jianzhao Zhou, Jingzheng Ren, Chang He
Summary: This article introduces an integrated novel process for biomass waste valorization based on torrefaction, gasification, and solid oxide fuel cell (SOFC). The sustainability of the process is analyzed through economic, exergy, advanced exergy, and exergoeconomics indicators. The economic analysis shows that the process is not economically feasible below 90% operational efficiency and the subsidized process is not economically feasible below 80% efficiency. The gasifier, HeatXC, and SOFC have significant potential for exergy improvement and targeting these components can enhance the process's exergy and economic performance.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Cuneyt Uysal, Uemit Agbulut, Erdem Elibol, Tuna Demirci, Mustafa Karagoz, Suat Saridemir
Summary: Graphene oxide nanoparticles were synthesized and added to a diesel-biodiesel blend. The fuel with 100 ppm graphene oxide nanoparticles showed the highest exergy efficiency and sustainability index, and the second-cheapest specific exergy cost of crankshaft work.
Article
Thermodynamics
Ozgur Balli, Alper Dalkiran
Summary: The study aims to investigate thermodynamic, environmental, and sustainability performances of turboprop engines on UAVs using jet fuel and biofuel. While the energy and exergy-based performance metrics were negatively impacted by biofuel usage, emission-based environmental impact analyses were improved.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Review
Energy & Fuels
Muhammad Faizan Tahir, Chen Haoyong, Han Guangze
Summary: This paper emphasizes the importance of integrating renewable energy and integrated energy systems to improve energy efficiency, reviewing the 4E analysis of thermal power plants, intermittent renewable energy, and integrated energy systems. While extensive work has been done on energy and exergy analysis in TPP, exergoeconomic and exergoenvironment analysis are still considered emerging fields.
Article
Engineering, Aerospace
Selcuk Ekici, Ilkay Orhan, Yasin Sohret, Onder Altuntas, T. Hikmet Karakoc
Summary: Thermodynamic analysis is a powerful tool for determining performance parameters of energy conversion systems by providing information on irreversibility. Splitting the exergy destruction into endogenous and exogenous parts can offer detailed insights into the relationship of irreversibility between components or systems.
INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES
(2022)
Article
Engineering, Aerospace
Kahraman Coban, Selcuk Ekici, Can Ozgur Colpan, Tahir Hikmet Karakoc
Summary: This paper investigates the cycle performance of a small size turbojet engine used in unmanned aerial vehicles at different altitudes and flight speeds, and develops a performance calculation code suitable for different flight regimes. The results show that this method can accurately predict the engine performance under real conditions.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2022)
Article
Thermodynamics
Irem Turk, Emre Ozbek, Selcuk Ekici, T. Hikmet Karakoc
Summary: Solar energy is an alternative energy source to fossil fuels, it is unlimited and nondestructive to nature. A solar-powered UAV with six hours of endurance is designed and evaluated, showing its potential for efficient flight in certain climate conditions.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Article
Energy & Fuels
Ozge Yetik, Tahir Hikmet Karakoc
Summary: In this study, the cooling effect of 15 prismatic batteries connected in series was compared using air and alumina nanofluid. The results showed that the nanofluid can effectively keep the battery at a safe operating temperature under certain conditions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Thermodynamics
Alper Dalkiran, Murat Ayar, Utku Kale, Andras Nagy, T. Hikmet Karakoc
Summary: The study focuses on analyzing the impact of airport operations and investments in a comprehensive manner, with a particular emphasis on the concept of green airports. The findings suggest that economic efficiency and design themes are of primary importance, followed by environmental concerns.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Editorial Material
Thermodynamics
T. Hikmet Karakoc, Can Ozgur Colpan, Selcuk Ekici, Ozge Yetik
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Article
Thermodynamics
Ozgur Balli, T. Hikmet Karakoc
Summary: This study presents a detailed analysis of exergy, exergoeconomic, environmental damage cost and impact of the aircraft engine turbofan (ATFE) in the aerospace industry. The results indicate the need to reduce waste exergy rate to improve exergy efficiency and sustainability index of the turbofan engine.
Editorial Material
Engineering, Aerospace
Tahir Hikmet Karakoc, Can ozgur Colpan, Ozge Yetik, Alper Dalkiran
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2023)
Review
Energy & Fuels
Sera Ayten Cetinkaya, Tacettin Disli, Gamze Soyturk, Onder Kizilkan, C. Ozgur Colpan
Summary: Hydrogen is becoming increasingly important in the clean energy transition, and the safe and high-density storage of hydrogen is crucial in the hydrogen ecosystem. Metal hydride storage appears to be superior to compressed gas storage, but thermal management is a challenge that needs to be addressed. This study provides a comprehensive review of heat transfer, thermal management techniques, and studies on the thermal management of metal hydride tanks in integrated systems with fuel cells and/or electrolyzers.
Article
Thermodynamics
Duran Calisir, Selcuk Ekici, Adnan Midilli, T. Hikmet Karakoc
Summary: This study investigates the environmental impacts of using different power groups in a fixed-wing UAV, and finds that using a hybrid power group can reduce global warming, terrestrial ecotoxicity, photochemical oxidation, and other environmental impacts.
Article
Thermodynamics
Olgun Konur, Onur Yuksel, S. Aykut Korkmaz, C. Ozgur Colpan, Omur Y. Saatcioglu, Burak Koseoglu
Summary: This study focuses on the potential fuel-saving and sustainability performance of a tanker ship's power generation plant by integrating an ORC system, which reduces the number or load of generators. The integration of the Organic Rankine Cycle (ORC) system resulted in a 15% reduction in fuel consumption from diesel generators and a total fuel consumption reduction of 5.16% for the vessel. The operation-dependent indicators were affected by operations with longer working hours.
Article
Energy & Fuels
Alper Can Ince, C. Ozgur Colpan, Ali Keles, Mustafa Fazil Serincan, Ugur Pasaogullari
Summary: This study presents a scaling and performance assessment of a power-to-methane system based on a new operation strategy. A mathematical model is developed for the CO2 methanation fixed bed reactor, PV panels, and alkaline electrolyzer. The model is compared with experimental study and used to simulate a small scale PtM system. The system's electrical efficiency is found to be between 55 and 59% under variable operating conditions.
Review
Multidisciplinary Sciences
Daniel Rohacs, Onur Yasar, Utku Kale, Selcuk Ekici, Enver Yalcin, Adnan Midilli, T. Hikmet Karakoc
Summary: This study reviews articles from open literature that examine particle image velocimetry techniques, focusing on components such as lasers, cameras, lenses, tracers, computers, synchronizers, and seeders. The evaluation results are categorized and explained using tables and figures. The study serves as a starting point for researchers and industrial companies interested in studying and implementing PIV experiments, as well as providing insights into the advantages and disadvantages of past and current technologies and potential upgrades for existing PIV laboratories.
Article
Transportation
Selcuk Ekici, Murat Ayar, Ugur Kilic, T. Hikmet Karakoc
Summary: This study examines the noxious emissions caused by equipping two types of aircraft offered by different manufacturers in the industry with the most commonly used engine combinations for commercial aviation on the same route and trajectory. The research utilizes the latest databases such as BADA v4.2_1, ANP v2.3, and ICAO EDDB25/FOCA to analyze fuel consumption and emissions in four different scenarios during identical flight operations. It also proposes a systematic aircraft-engine pair decision mechanism and a comprehensive computer simulation method for fuel consumption and emissions analysis.
JOURNAL OF AIR TRANSPORT MANAGEMENT
(2023)
Review
Engineering, Aerospace
Hursit Degirmenci, Alper Uludag, Selcuk Ekici, T. Hikmet Karakoc
Summary: This paper provides a historical overview of hydrogen-powered aviation and analyzes the critical components of the hydrogen supply network. As part of the Sustainable Development Goals, the study presents a future-oriented concept and discusses the challenges and prospects for decarbonization.
PROGRESS IN AEROSPACE SCIENCES
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
