Article
Thermodynamics
Khaled A. Naeim, Ahmed A. Hegazi, Mohamed M. Awad, Salah H. El-Emam
Summary: In this study, a computational parametric study was conducted to optimize the fogging strategy for gas turbine inlet air cooling. The results showed that fogging with a natural gas heat exchanger using a storage tank was the most effective strategy in terms of GT output power, thermal efficiency, and specific fuel consumption.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Elsayed Barakat, Tai Jin, Gaofeng Wang
Summary: This study investigates the influence of fogging cooling systems on gas turbine performance when integrated with selective exhaust gas recirculation (S-EGR), and finds that this combination can increase gas turbine output power and efficiency.
Article
Thermodynamics
Elsayed Barakat, Tai Jin, Hui Wang, Keqi Hu, Gaofeng Wang
Summary: This study investigates the performance of fogging cooling system for micro gas turbines through experimental and numerical methods. The results show that increasing the number of nozzles improves the cooling efficiency and evaporation rate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Obida Zeitoun
Summary: Gas turbine inlet air-cooling (TIAC) is a well-established technology for increasing gas turbine output and efficiency, particularly in hot regions. This study investigated the implementation of a two-stage evaporative TIAC system in Riyadh city to address the harsh weather conditions.
Article
Thermodynamics
Song-Hun Cha, Sun-Ik Na, Yeong Ho Lee, Min Soo Kim
Summary: A novel configuration of gas turbine-carbon dioxide combined cycle power plant utilizing LNG cold energy is proposed, enhancing power output and efficiency through gas turbine inlet air cooling and heat recovering system. Compared to traditional systems, this configuration increases both relative power output and efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Mehran Nematollahi, Soheil Porkhial, Madjid Ghodsi Hassanabad
Summary: The performance of gas turbines is significantly affected by climate conditions. Absorption chillers have distinct advantages in cooling systems, but in hot and humid climates, they require significant cooling capacity. This study presents two new integrated cooling systems that can cool the air to ideal conditions while reducing the cooling capacity requirements of absorption chillers.
Article
Thermodynamics
Yousef N. Dabwan, Liang Zhang, Gang Pei
Summary: This study proposes a novel inlet air cooling system for intercooled gas turbine power plants in hot climates. The system utilizes waste heat to cool the compressor's inlet air and improves the power output and overall efficiency of the plant. Compared to other popular cooling technologies, it has higher annual profits and a shorter payback period, making it a highly cost-effective solution.
Article
Thermodynamics
Andrii Radchenko, Ionut-Cristian Scurtu, Mykola Radchenko, Roman Radchenko, Serhiy Forduy, Anatoliy Zubarev
Summary: The fuel efficiency of gas engines is affected by the intake air temperature, and deeper cooling through absorption chiller can enhance the efficiency of traditional cooling system for intake air.
Article
Engineering, Aerospace
Ali Dinc, Ali Mamedov, Ertugrul Tolga Duran, Fethi Abbassi, Ibrahim Elbadawy, Kaushik Nag, Mehdi Moayyedian, Mohamed Fayed, Murat Otkur, Yousef Gharbia
Summary: This study investigates the impact of inlet air cooling on greenhouse gas emissions and engine performance for a land-based gas turbine engine under varying ambient temperatures. The results show that inlet air cooling can mitigate the adverse effects of hot weather on engine performance and emissions.
Article
Thermodynamics
Gaowen Liu, Wenbin Gong, Heng Wu, Liangwei Pang, Aqiang Lin
Summary: The study reveals the aero-thermal characteristics of a cover-plate type pre-swirl system for gas turbine engines through theoretical derivation and experimental evaluation, showing that the temperature drop and power consumption of the system vary with mass flow rate ratio and rotating speed. The results demonstrate a linear relationship between the dimensionless temperature drop and effective swirl ratio at the nozzle outlet, indicating that the algebraic sum of dimensionless temperature drop and power consumption is always equal to 1, which can be used as a reference for system design and optimization.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Andrea Giugno, Alessandro Sorce, Alessandra Cuneo, Stefano Barberis
Summary: This study proposes integrating a highly efficient heat pump into a conventional natural gas combined cycle to enhance flexibility, optimizing for power production increase. The research finds that the optimal ratio between air-cooled heat pump electrical consumption and electrical combined cycle capacity is 1/100, applicable to humid subtropical climates and Mediterranean hot summer climates. The study highlights the importance of optimization in influencing revenues and size optimization for integrated systems under different market and climate conditions.
Article
Thermodynamics
Yang Du, Nan Jiang, Yicen Zhang, Xu Wang, Pan Zhao, Jiangfeng Wang, Yiping Dai
Summary: The paper introduces an innovative power-cooling integrated system and conducts comprehensive thermodynamic and thermo-economic analyses to prove its feasibility. Through multi-objective optimization, it is found that the novel system has higher total energy efficiency and lower levelized cost of energy compared to standalone systems.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Physical
Matteo Genovese, David Blekhman, Michael Dray, Petronilla Fragiacomo
Summary: This study evaluated the impact of adjusting the temperature of the auxiliary cooling system on the energy consumption and efficiency of a hydrogen fueling station. Results showed a significant reduction in energy consumption and improved energy efficiency by adjusting the closed-loop cooling system temperature. The benefits were more pronounced for stations with higher daily refueling events or sales volume.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Guangli Fan, A. Ahmadi, M. A. Ehyaei, Biplab Das
Summary: The proposed cogeneration system utilizes waste heat from hot gas to generate steam and cooling capacity, improving energy efficiency and economic viability while reducing thermal pollution. Additionally, the system can be used to store hydrogen as a clean fuel.
Article
Thermodynamics
Hang Yu, Tianyi Zhang, Lei Chen, Wen-Quan Tao
Summary: This study focuses on the models of chillers and cooling towers and compares the predictive performance of three different models. In terms of the chiller model, the Yoshida function model in the empirical models shows the highest accuracy with a mean square error of 0.0592, followed by the neural network model with a mean square error of 0.2, while the hybrid model has lower accuracy. For the cooling tower model, the empirical models and the neural network model have similar accuracy, both higher than the hybrid model.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2023)
Article
Engineering, Chemical
Tania Sadeghi, Iman Fakhari, Anders Andreasen, Ahmad Arabkoohsar
Summary: This study investigates the possibility of predicting the performance curves of multi-stage centrifugal natural gas compressors with offshore applications using data mining techniques, thereby eliminating the need for expensive experiments. The results show that it is possible to accurately predict the performance curves of compressors with limited samples, although marginal errors are inevitable.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Ecology
Amin Amiri Delouei, Hasan Sajjadi, Meysam Atashafrooz, Mohammad Hesari, Mohamed Bechir Ben Hamida, Ahmad Arabkoohsar
Summary: Utilizing ultrasonic excitation as an active method, this study experimentally investigated the effects of ultrasonic excitation on the heat transfer rate in a fin-and-flat tube heat exchanger. A comprehensive parameter study was conducted, and the results showed that reducing the flow rate, ambient temperature, and air passing velocity increased the effects of ultrasonic excitation. The highest heat transfer enhancement was 70.11%, measured at the lowest air passing velocity and ambient temperature with a Reynolds number 2166.
Article
Thermodynamics
Mohsen Tavallaei, Mahmood Farzaneh-Gord, Ali Jabari Moghadam, Amir Ebrahimi-Moghadam
Summary: In this study, the influence of pillow-plate geometrical parameters and flow specification on the thermo-hydraulic performance of the pillow-plate heat exchanger (PPHE) is evaluated. A multi-objective optimization method is applied to find the optimal design of PPHE. The results show a conflict between increasing the performance evaluation criterion and decreasing the total entropy generation.
HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Mechanical
Seyed Amir Hosseini Baboli, Ahmad Arabkoohsar, Iman Seyedi
Summary: In this study, the thermal performance of a conventional polymer fuel cell parallel cooling channel was investigated numerically and optimized using computational fluid dynamics and the Taguchi method. The results showed that increasing fluid velocity, ethylene glycol concentration, and aluminum oxide nanoparticle concentration improved heat transfer and pressure drop performance. Reynolds number and nanoparticle percentage were identified as the most influential parameters for heat transfer rate and pressure drop.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Thermodynamics
Mohammad Jamshidmofid, Mohammad Olfati, Ahmad Arabkoohsar, Abbas Abbassi
Summary: For the first time, this research investigates the influence of wavy orientations on entropy generation and exergy destruction in wavy microchannels with different types of aqueous nanofluids. Numerical simulations were conducted with two types of wavy microchannels (Left-Right and Up-Down) using silver, aluminum oxide, and hybrid silver-aluminum oxide nanofluids at different concentrations. The results show that the Left-Right wavy microchannel exhibits 20% lower exergy destruction compared to the Up-Down one, and utilizing nanofluids reduces exergy destruction, with the largest reduction observed in the case of silver nanofluid. Additionally, nanofluids enhance the effectiveness number while increased pumping power decreases it.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Green & Sustainable Science & Technology
Ali Tavakoli, Mahmood Farzaneh-Gord, Amir Ebrahimi-Moghadam
Summary: This study evaluates the thermo-hydraulic performance of utilizing sinusoidal internal fins and phase change material (PCM) in LHTES systems. A numerical framework is developed to analyze the geometrical parameters of the fins and investigate different heat transfer and thermodynamic characteristics. The results show that the highest growth of liquid fraction and the lowest entropy generation are achieved in case 4, with H/L = 0.125 and a thickness of 3mm, compared to a case with simple straight fins.
Article
Thermodynamics
Ehsanolah Assareh, Parisa Kazemiani-Najafabadi, Ehsan Amiri Rad, Ahmad Arabkoohsar
Summary: Waste heat recovery is effective for achieving higher supply efficiency, reduced energy consumption, and lower carbon footprint. This research proposes and optimizes a waste heat-driven combined cycle system for simultaneous cooling, heating, and power supply. Through analysis and optimization, the system demonstrates an exergy efficiency of 54.16% with a total cost of $23458.07/year.
Article
Thermodynamics
Seyedeh Mohadeseh Miri, Mahmood Farzaneh-Gord, Ali Kianifar
Summary: The current study aims to optimize the integration of a solar ejector cycle with cold storage by applying a multi-objective modified particle swarm optimization technique. The effects of various collector and working fluid choices on system behavior are evaluated, with zeotropic fluid and parabolic trough collector identified as the most effective options. Hot and cold storage tanks are used to ensure stable access to cold produced and enhance the system's coefficient of performance. The employment of a parabolic trough collector results in maximum performance and efficiency, as well as the minimum size of the ejector cycle and cold storage tank.
Review
Thermodynamics
Mohammad Kiani-Moghaddam, Mohsen N. Soltani, Soteris A. Kalogirou, Omid Mahian, Ahmad Arabkoohsar
Summary: The concept of the energy hub (EH) is promising for evaluating multi-carrier integrated energy systems (IESs) at various scales. Existing literature on multi-carrier EH-based IESs has matured adequately for broad scales, but there is confusion and lack of clarity for limited-scale EH-based IESs. Additionally, complex studies involving uncertainties in decision-making variables, objective functions, and parameters require careful consideration for realistic conditions and effective optimization. This review paper aims to address these gaps by identifying and analyzing uncertain input parameters, proposing solution approaches, and discussing future research trends in multi-carrier EH-based IESs studies.
Article
Engineering, Environmental
Navid Moghaddas-Zadeh, Mahmood Farzaneh-Gord, Amir Ebrahimi-Moghadam, William P. Bahnfleth
Summary: This study suggests a novel heat pump system that utilizes turbo-expanders to recover energy from high-pressure natural gas, in order to provide part of the heat demand for a natural gas city gate station. The system is evaluated in terms of energy, exergy, and economics, showing advantages in fuel savings, exergy efficiency, and economic feasibility.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Construction & Building Technology
Navid Moghaddas-Zadeh, Mahmood Farzaneh-Gord, Amir Ebrahimi-Moghadam, William P. Bahnfleth
Summary: This study presents a general procedure for designing a chiller network that adapts to an arbitrary annual cooling demand distribution. The procedure utilizes the particle swarm optimization algorithm to find the optimal chiller loading distribution and selects the best configuration through a life cycle cost analysis. The results show significant reductions in energy consumption and life cycle costs compared to the conventional configuration under the baseline strategy.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Carina L. Gargalo, Haoshui Yu, Nikolaus Vollmer, Ahmad Arabkoohsar, Krist Gernaey, Guerkan Sin
Summary: With the increasing concern for climate change, renewable and sustainable energy production has attracted considerable attention. Life cycle assessment (LCA) is an effective tool for comparing environmental impacts. However, there are differences in the choice of LCA methods, detail sharing, and sensitivity analysis among different studies, making it difficult to compare results.
COMPUTERS & CHEMICAL ENGINEERING
(2024)
Article
Green & Sustainable Science & Technology
Seyed Mojtaba Alirahmi, Truls Gundersen, Ahmad Arabkoohsar, Jirf Jaromfr Klemes, Gurkan Sin, Haoshui Yu
Summary: This study proposes a complex energy storage/conversion system integrating various technologies to generate electricity, cooling, and water. The system aims to reduce CO2 emissions and address grid issues caused by intermittent renewables. The results show high efficiency and low cost for the proposed system, analyzed using a multi-objective optimization algorithm.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Construction & Building Technology
Brenda V. F. Silva, Jens Bo Holm-Nielsen, Sasan Sadrizadeh, Mavd P. R. Teles, Mohammad Kiani-Moghaddam, Ahmad Arabkoohsar
Summary: This paper comprehensively reviews the importance of building energy consumption and greenhouse gas emissions worldwide, with a specific focus on energy efficiency and comfort in healthcare buildings. It analyzes both passive and active measures for energy savings, emphasizing the critical role of user behavior. It also provides design and retrofitting recommendations for healthcare buildings and addresses the lack of research on small-scale healthcare buildings.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Green & Sustainable Science & Technology
Sajjad Mahmoudinezhad, Matthias Mando, Ahmad Arabkoohsar
Summary: Storing off-peak cheap electricity for high-temperature heat supply in different mediums shows promise, but designing an appropriate heat exchanger system is crucial for minimizing risks and maximizing economic benefits. This study focuses on designing an optimal energy conversion unit and conducting a techno-economic analysis to demonstrate its proficiency in a case study in Denmark.
