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Dr Abolfazl Ahmadi has been a member of the academic staff in the Department of Energy Systems Engineering (School of Advanced Technologies (New Technologies), Iran University of Science and Technology) since 1992. He obtained his PhD in Mechanical Engineering from Sheffield University in the UK. He earned a BSc degree from Ferdousi Mashhad University and an MSc degree from the Sharif University of Technology in Mechanical Engineering. His research interests include energy system optimization.
The use of renewable energy systems including wind, geothermal, and solar is increasing on a daily basis at industrial and domestic applications scale. The restrictions and regulations imposed by developed and developing countries on the industrial sector to reduce greenhouse gases emission have a significant effect on the progress and development of renewable energy systems. Among the most widely used renewable energy sources is solar energy due to its cheap maintenance and wide applications from a temperature point of view. In this work, for the first time, low-temperature solar collectors are reviewed and discussed for different types of collectors, and the various technical progress in thermal and optics are presented. The contribution of this survey is that cutting-edge techniques such as the solar collector nano-fluids for heat transfer enhancement and the phase change material for storage are delivered. The applications of these emergent techniques in different types of solar collectors are comprehensively reported and their performance is deeply discussed. It can be that the most important parameters affecting the solar collector’s performance are the geometry of the solar collectors. Subsequently, geometry modifications are reviewed and discussed for different solar collectors, and it can conclude that a proper design of solar collectors can reduce their costs by 10%. Thanks to the present systematic discussion on the low-temperature solar collectors, this work will provide fruitful information for engineers and researchers about the applications of solar collectors as well as it provides directions and future recommendations for future research in this field.
A. Ahmadi; M. A. Ehyaei; A. Doustgani; Mamdouh El Haj Assad; F. Esmaeilion; A. Hmida; D. H. Jamali; R. Kumar; Z. X. Li; A. Razmjoo. Recent progress in thermal and optical enhancement of low temperature solar collector. Energy Systems 2021, 1 -40.
AMA StyleA. Ahmadi, M. A. Ehyaei, A. Doustgani, Mamdouh El Haj Assad, F. Esmaeilion, A. Hmida, D. H. Jamali, R. Kumar, Z. X. Li, A. Razmjoo. Recent progress in thermal and optical enhancement of low temperature solar collector. Energy Systems. 2021; ():1-40.
Chicago/Turabian StyleA. Ahmadi; M. A. Ehyaei; A. Doustgani; Mamdouh El Haj Assad; F. Esmaeilion; A. Hmida; D. H. Jamali; R. Kumar; Z. X. Li; A. Razmjoo. 2021. "Recent progress in thermal and optical enhancement of low temperature solar collector." Energy Systems , no. : 1-40.
With the diminution of fossil fuel sources and the substantial importance of CO2 and other greenhouse gasses emission, the usage of enhanced thermal power plants coupled with renewable energies, such as solar, becomes more vital and promising. This paper proposes a novel configuration of the power generation system, featuring a solar collector to supply the heat for a two-stage steam turbine with inter heating and an Organic Rankine cycle as bottoming cycle of the steam turbine. The proposed system has been simulated and optimized using the particle swarm optimization algorithm. A heat storage system with NaNO3 and KNO3 in 3:2 ratios is used to store the extra heat in daylight to extend the operation at nighttime. For achieving the best working conditions for the proposed hybrid system, we employed a multi-objective optimization to maximizing the exergy efficiency while minimizing the levelized cost of electricity production. The simulation was performed using the Engineering Equation Solver (EES), and MATLAB software which is used for receiving the simulation results from EES and optimizing the key design parameters of the system using the PSO algorithm to select the best design variables. The optimization showed that at the optimum point, the exergy efficiency of the system and the levelized cost of electricity production reach to be 63.89% and 0.1529 USD/kWh, respectively. Results also showed that in the proposed system, the solar collector is the most important source of exergy destruction, in which more than 59% of the total destructed exergy happens in it. Sensitivity analysis also revealed that decreasing the turbine's inlet temperature will increase the production cost of electricity due to lower efficiency. Also, any changes (deviation from design point) in the back pressure of the low-pressure turbine will decrease the efficiency; while the production cost of electricity increases if this back pressure increases and vice versa.
Mehran Bahari; Abolfazl Ahmadi; Reza Dashti. Exergo-economic analysis and optimization of a combined solar collector with steam and Organic Rankine Cycle using particle swarm optimization (PSO) algorithm. Cleaner Engineering and Technology 2021, 4, 100221 .
AMA StyleMehran Bahari, Abolfazl Ahmadi, Reza Dashti. Exergo-economic analysis and optimization of a combined solar collector with steam and Organic Rankine Cycle using particle swarm optimization (PSO) algorithm. Cleaner Engineering and Technology. 2021; 4 ():100221.
Chicago/Turabian StyleMehran Bahari; Abolfazl Ahmadi; Reza Dashti. 2021. "Exergo-economic analysis and optimization of a combined solar collector with steam and Organic Rankine Cycle using particle swarm optimization (PSO) algorithm." Cleaner Engineering and Technology 4, no. : 100221.
Global warming and population growth have been contributing factors to the decline of freshwater resources around the globe. More than 45% of the desalination plants are in the Middle East. Due to the severe scarcity of freshwater resources, Iran also needs to construct several desalination plants, since by 2021 the ratio of freshwater per capita in the country to the world average per capita will be 0.8. The uses of solar, wind, geothermal, and wave are practical in desalination systems. The average solar radiation in Iran is 15.3 kWh/m2/day, which includes more than 2800 hours of radiation per year in central regions. Also wind, geothermal, and wave energy potentials are equalled to 100×106 MW, 200 MW, and 20 kW/m, respectively. The purpose of this paper is to evaluate the feasibility of using renewable energy for desalination in arid and semi-arid regions and Iran has been considered as a case study.
Farbod Esmaeilion; Abolfazl Ahmadi; Siamak Hoseinzadeh; Mehdi Aliehyaei; Seyed Ali Makkeh; Davide Astiaso Garcia. Renewable energy desalination; a sustainable approach for water scarcity in arid lands. International Journal of Sustainable Engineering 2021, 1 -27.
AMA StyleFarbod Esmaeilion, Abolfazl Ahmadi, Siamak Hoseinzadeh, Mehdi Aliehyaei, Seyed Ali Makkeh, Davide Astiaso Garcia. Renewable energy desalination; a sustainable approach for water scarcity in arid lands. International Journal of Sustainable Engineering. 2021; ():1-27.
Chicago/Turabian StyleFarbod Esmaeilion; Abolfazl Ahmadi; Siamak Hoseinzadeh; Mehdi Aliehyaei; Seyed Ali Makkeh; Davide Astiaso Garcia. 2021. "Renewable energy desalination; a sustainable approach for water scarcity in arid lands." International Journal of Sustainable Engineering , no. : 1-27.
The present work deals with a novel configuration of four cycles such as steam gas cycles and an organic Rankine cycle and a biogas Brayton cycle and a solar Brayton cycle are introduced for recovering energy from hot exhaust gas and its simulation and optimization are discussed. Also, a carbon-amine adsorption system has been utilized for separating and storing carbon dioxide from hot exhaust gases and convert it to methane. For this new system, exergy, economical exergy, energy, economic and environmental exergy evaluations have been performed. To analyze the different parts, their thermodynamic and economic models, EES and MATLAB software have been used to optimize the exergy-economic cycle in order to reduce costs and increase exergy. In this research, genetic algorithm has been used for optimization. At the optimal point, the values of exergy efficiency are equal to 61.7% and the cost of electricity generation is 6.36 cent per kilowatt hour. The results show that adding Rankine cycles to the gas cycles increments the exergy and energy efficiency to 73.7 and 71.8, respectively. Nevertheless, integrating the carbon capture unit with this system reduced the exergy and energy efficiency to 51.9% and 50.5%, respectively. Based on the economic results for the presented system, it is indicated that the simple return on investment and return on investment are both 1.5 years. In addition, internal rate and net present value of return were 0.68 and 3.13*09 $ respectively. This system can generate 327,160 kW of electricity in addition, the carbon capture system unit can prevent and convert 627,000 tons of carbon dioxide into methane fuel annually.
Rahim Zahedi; Abolfazl Ahmadi; Reza Dashti. Energy, exergy, exergoeconomic and exergoenvironmental analysis and optimization of quadruple combined solar, biogas, SRC and ORC cycles with methane system. Renewable and Sustainable Energy Reviews 2021, 150, 111420 .
AMA StyleRahim Zahedi, Abolfazl Ahmadi, Reza Dashti. Energy, exergy, exergoeconomic and exergoenvironmental analysis and optimization of quadruple combined solar, biogas, SRC and ORC cycles with methane system. Renewable and Sustainable Energy Reviews. 2021; 150 ():111420.
Chicago/Turabian StyleRahim Zahedi; Abolfazl Ahmadi; Reza Dashti. 2021. "Energy, exergy, exergoeconomic and exergoenvironmental analysis and optimization of quadruple combined solar, biogas, SRC and ORC cycles with methane system." Renewable and Sustainable Energy Reviews 150, no. : 111420.
Technology developments have increased the more efficient use of solar energy, which has led to the emergence of novel technologies to absorb, convert and store solar irradiations. Solar ponds are one of the large-scale systems that have the proper potentials to achieve these objectives. The obtained thermal energy from the solar ponds is classified as low-grade heat. This paper brings together the benefits of the progress of solar ponds. Initially, the new types of construction, salts, and additives for achieving enhancements in the thermal performance of the solar ponds are presented. Then, advanced models for reducing the heat losses from side walls, upper and lower zones are assessed. Finally, different tools for evaluating the solar ponds are reviewed. In this review, the accomplishments in all processes for the absorption of solar irradiation, storing and extracting thermal energy, and the application of salinity gradient solar ponds are reviewed in detail.
Farbod Esmaeilion; Abolfazl Ahmadi; Mehdi Aliehyaei. Low-grade heat from solar ponds: trends, perspectives, and prospects. International Journal of Ambient Energy 2021, 1 -30.
AMA StyleFarbod Esmaeilion, Abolfazl Ahmadi, Mehdi Aliehyaei. Low-grade heat from solar ponds: trends, perspectives, and prospects. International Journal of Ambient Energy. 2021; ():1-30.
Chicago/Turabian StyleFarbod Esmaeilion; Abolfazl Ahmadi; Mehdi Aliehyaei. 2021. "Low-grade heat from solar ponds: trends, perspectives, and prospects." International Journal of Ambient Energy , no. : 1-30.
A hybrid system is the most suitable option for supplying the network demand in a renewable resource power plant. In this paper, a hybrid system of fuel cell-wind turbine was assessed based on energy. For a country region with a sustainable wind speed, the system was studied, and its benefits and limitations were evaluated. In this work, based on regional wind data, the specifications of the elements were determined, and a model was simulated, which can assess the power production of a power plant. In the case study region, Kohak Qazvin, by applying the model, wind turbine capacity increased about 2%, and wind turbines and fuel cells contributed 39% and 61% in demand supplying, respectively. Some undesirable environmental effects of renewable energy were evaluated in this paper, including changes in regional ecosystem, thermal pollution production, chemical pollution, and biological pollution due to the use of fuel cell systems and digestive power plants. This paper investigates the environmental effects of using a hybrid wind turbine system, electrolysis system, solid oxide fuel cell and gasifier. The results showed that the hybrid system reduced 34.62% of carbon dioxide production, compared to the single system. Also the price of the electrical energy produced by the wind farm was 20.6 cent/kWh but by applying the hybrid system, the cost reduced to 15.47 cent/kWh.
Rahim Zahedi; Abolfazl Ahmadi; Mohammad Sadeh. Investigation of the load management and environmental impact of the hybrid cogeneration of the wind power plant and fuel cell. Energy Reports 2021, 7, 2930 -2939.
AMA StyleRahim Zahedi, Abolfazl Ahmadi, Mohammad Sadeh. Investigation of the load management and environmental impact of the hybrid cogeneration of the wind power plant and fuel cell. Energy Reports. 2021; 7 ():2930-2939.
Chicago/Turabian StyleRahim Zahedi; Abolfazl Ahmadi; Mohammad Sadeh. 2021. "Investigation of the load management and environmental impact of the hybrid cogeneration of the wind power plant and fuel cell." Energy Reports 7, no. : 2930-2939.
The thermal energy conversion of natural gas (NG) using appropriate configuration cycles represents one of the best nonrenewable energy resources because of its high heating value and low environmental effects. The natural gas can be converted to liquefied natural gas (LNG), via the liquefaction process, which is used as a heat source and sink in various multigeneration cycles. In this paper, a new configuration cycle is proposed using LNG as a heat source and heat sink. This new proposed cycle includes the CO2 cycle, the organic Rankine cycle (ORC), a heater, a cooler, an NaClO plant, and reverse osmosis. This cycle generates electrical power, heating and cooling energy, potable water (PW), hydrogen, and salt all at the same time. For this purpose, one computer program is provided in an engineering equation solver for energy, exergy, and thermo-economic analyses. The results for each subsystem are validated by previous researches in this field. This system produces 10.53 GWh electrical energy, 276.4 GWh cooling energy, 1783 GWh heating energy, 17,280 m3 potable water, 739.56 tons of hydrogen, and 383.78 tons of salt in a year. The proposed system energy efficiency is 54.3%, while the exergy efficiency is equal to 13.1%. The economic evaluation showed that the payback period, the simple payback period, the net present value, and internal rate of return are equal to 7.9 years, 6.9 years, 908.9 million USD, and 0.138, respectively.
Tri Tjahjono; Mehdi Ehyaei; Abolfazl Ahmadi; Siamak Hoseinzadeh; Saim Memon. Thermo-Economic Analysis on Integrated CO2, Organic Rankine Cycles, and NaClO Plant Using Liquefied Natural Gas. Energies 2021, 14, 2849 .
AMA StyleTri Tjahjono, Mehdi Ehyaei, Abolfazl Ahmadi, Siamak Hoseinzadeh, Saim Memon. Thermo-Economic Analysis on Integrated CO2, Organic Rankine Cycles, and NaClO Plant Using Liquefied Natural Gas. Energies. 2021; 14 (10):2849.
Chicago/Turabian StyleTri Tjahjono; Mehdi Ehyaei; Abolfazl Ahmadi; Siamak Hoseinzadeh; Saim Memon. 2021. "Thermo-Economic Analysis on Integrated CO2, Organic Rankine Cycles, and NaClO Plant Using Liquefied Natural Gas." Energies 14, no. 10: 2849.
Objectives: The purpose of this study is to analyze the performance of a one-megawatt photovoltaic power plant in Arak-Iran, according to IEC-61724 standard, using data recorded over a year. The photovoltaic plant of Arak is located at coordinates 34.0954° N and 49.7013° E. This power plant is the first-megawatt photovoltaic power plant in Iran which two types of modules are used and it was constructed by the New Energy Agency and the Power Research Center under the supervision of the Ministry of Energy in 2016. In this plant, a combination of monocrystal and polycrystalline modules is used, and the annual output is 1756 MWh. Methods: The combination of modules is based on the 1920 modules of 250 W of polycrystalline and 260 modules of 260 W of monocrystal in the construction of the power plant. There are also 4 inverters and a 1250 KVA dry power trans-former. The plant has suitable productivity, with a performance ratio equal to 0.8 and a final yield of 4.57. Results: Ultimately the PV plant is simulated by PVsyst and the results are compared with monitored records which indi-cated the appropriate accuracy of the collected data. The calculated performance ratio for the power plant by PVsyst is 81.2% and has a 1.5% difference with the monitored totals. The energy supplied during one year by the power plant is 1756 MWh, whereas the prediction of annual energy yield that entered to the grid is equal to 1757 MWh.
Farbod Esmaeilion; Abolfazl Ahmadi; Aryan Esmaeilion; Mehdi Ali Ehyaei. The Performance Analysis and Monitoring of Grid-connected Photovoltaic Power Plant. Current Chinese Computer Science 2021, 1, 77 -96.
AMA StyleFarbod Esmaeilion, Abolfazl Ahmadi, Aryan Esmaeilion, Mehdi Ali Ehyaei. The Performance Analysis and Monitoring of Grid-connected Photovoltaic Power Plant. Current Chinese Computer Science. 2021; 1 (1):77-96.
Chicago/Turabian StyleFarbod Esmaeilion; Abolfazl Ahmadi; Aryan Esmaeilion; Mehdi Ali Ehyaei. 2021. "The Performance Analysis and Monitoring of Grid-connected Photovoltaic Power Plant." Current Chinese Computer Science 1, no. 1: 77-96.
A multi-generation system has been considered to meet different purposes in recent years. Two main purposes of this system are producing various products, as well as the improved performance of this system, simultaneously. In this paper, a new cogeneration hybrid cycle is introduced to provide electricity and urea production. This system includes gas cycle, steam cycle, carbon capture system, proton exchange membrane, electrolyzer, cryogenic air separation unit, and urea and ammonia synthesis reactors. The energy, economic, exergy, exergoenvironmental, and environmental analyses of this proposed system have been investigated. The results of this study demonstrate that this system produces 689 GW h electrical energy and 1.323 million tons of urea annually. The energy and exergy efficiencies of these hybrid systems are equal to 31. 8% and 53.3%, respectively. The highest and lowest rate of exergy distribution is related to the urea synthesis reactor and cryogenic air separation unit, respectively. In the economic evaluation, the social cost of carbon dioxide is considered. The four main economic factors: net present value, payback period and simple payback period, and internal rate of return are examined and calculated. By considering the social cost of the carbon dioxide separation unit, the economic factors are improved considerably. The exergoenvironment and environmental damage effectiveness and exergy stability factors for this system are equal to 1.64, 3.1, and 0.76, respectively.
H. Abbaspour; M.A. Ehyaei; A. Ahmadi; M. Panahi; A. Abdalisousan; A. Mirzohosseini. Energy, exergy, economic, exergoenvironmental and environmental (5E) analyses of the cogeneration plant to produce electrical power and urea. Energy Conversion and Management 2021, 235, 113951 .
AMA StyleH. Abbaspour, M.A. Ehyaei, A. Ahmadi, M. Panahi, A. Abdalisousan, A. Mirzohosseini. Energy, exergy, economic, exergoenvironmental and environmental (5E) analyses of the cogeneration plant to produce electrical power and urea. Energy Conversion and Management. 2021; 235 ():113951.
Chicago/Turabian StyleH. Abbaspour; M.A. Ehyaei; A. Ahmadi; M. Panahi; A. Abdalisousan; A. Mirzohosseini. 2021. "Energy, exergy, economic, exergoenvironmental and environmental (5E) analyses of the cogeneration plant to produce electrical power and urea." Energy Conversion and Management 235, no. : 113951.
The proposed cogeneration system consists of a gas cycle, an absorption chiller, a heat recovery steam generator (HRSG), and Copper-Chlorine (Cu-Cl) thermochemical cycle that is applied for power, cooling, and hydrogen production. The configuration of these cycles is somehow that the exhaust hot gas from the gas cycle operates a heat recovery steam generator (HRSG), which is considered to produce steam for the Cu-Cl cycle. Then, the rest of the heat of hot gas energy is recovered by an absorption chiller for producing a cooling capacity. In this cycle, minimum exhaust heat from the gas turbine delivers to the atmosphere and causes less thermal population and clean power generation. Moreover, providing cooling capacity and hydrogen production associated with this cogeneration is applicable to store hydrogen as a clean fuel. A comprehensive performance assessment of this cogeneration system has been carried out based on energy, exergy, economic, and exergoenvironmental analyses. The results revealed while energy and exergy efficiencies for the gas cycle alone are 19% and 15%, respectively, and with using this proposed plant, these values can be improved up to about 43% and 44%, respectively. Economic analysis of this system shows the simple payback period (SPP) value for the stand-alone gas cycle is about 7.2 years, whereas this index for the combined gas and Cu-Cl cycles is about 3.1 years and for the whole system is 2.4 years. The results of exergoenvironment analysis reveal that the highest exergy stability factor (exergy destruction) of 0.8 belongs to the Cu-Cl cycle and the lowest exergy stability value of about 0.03 belongs to the absorption chiller cycle.
Guangli Fan; A. Ahmadi; M.A. Ehyaei; Biplab Das. Energy, exergy, economic and exergoenvironmental analyses of polygeneration system integrated gas cycle, absorption chiller, and Copper-Chlorine thermochemical cycle to produce power, cooling, and hydrogen. Energy 2021, 222, 120008 .
AMA StyleGuangli Fan, A. Ahmadi, M.A. Ehyaei, Biplab Das. Energy, exergy, economic and exergoenvironmental analyses of polygeneration system integrated gas cycle, absorption chiller, and Copper-Chlorine thermochemical cycle to produce power, cooling, and hydrogen. Energy. 2021; 222 ():120008.
Chicago/Turabian StyleGuangli Fan; A. Ahmadi; M.A. Ehyaei; Biplab Das. 2021. "Energy, exergy, economic and exergoenvironmental analyses of polygeneration system integrated gas cycle, absorption chiller, and Copper-Chlorine thermochemical cycle to produce power, cooling, and hydrogen." Energy 222, no. : 120008.
: Efficient solar and wind energy to electricity conversion technologies are the best alternatives to reduce the use of fossil fuels and to evolve towards a green and decarbonized world. As the conventional photovoltaic systems use only the 600–1100 nm wavelength range of the solar radiation spectrum for electricity production, hybrid systems taking advantage of the overall solar radiation spectrum are gaining increasing interest. Moreover, such hybrid systems can produce, in an integrated and combined way, electricity, heating, cooling, and syngas through thermochemical processes. They have thus the huge potential for use in residential applications. The present work proposes a novel combined and integrated system for residential applications including wind turbines and a solar dish collector for renewables energy harvesting, an organic Rankine cycle for power production, an absorption chiller for cold production, and a methanation plant for CH4 production from captured CO2. This study deals with the energy, exergy, economic, and exergoenvironmental analyses of the proposed hybrid combined system, to assess its performance, viability, and environmental impact when operating in Tehran. Additionally, it gives a clear picture of how the production pattern of each useful product depends on the patterns of the collection of available renewable energies. Results show that the rate of methane production of this hybrid system changes from 42 up to 140 Nm3/month, due to CO2 consumption from 44 to 144 Nm3/month during a year. Moreover, the energy and exergy efficiencies of this hybrid system vary from 24.7% and 23% to 9.1% and 8%, respectively. The simple payback period of this hybrid system is 15.6 and the payback period of the system is 21.4 years.
Saeed Esfandi; Simin Baloochzadeh; Mohammad Asayesh; Mehdi Ali Ehyaei; Abolfazl Ahmadi; Amir Arsalan Rabanian; Biplab Das; Vitor A. F. Costa; Afshin Davarpanah. Energy, Exergy, Economic, and Exergoenvironmental Analyses of a Novel Hybrid System to Produce Electricity, Cooling, and Syngas. Energies 2020, 13, 6453 .
AMA StyleSaeed Esfandi, Simin Baloochzadeh, Mohammad Asayesh, Mehdi Ali Ehyaei, Abolfazl Ahmadi, Amir Arsalan Rabanian, Biplab Das, Vitor A. F. Costa, Afshin Davarpanah. Energy, Exergy, Economic, and Exergoenvironmental Analyses of a Novel Hybrid System to Produce Electricity, Cooling, and Syngas. Energies. 2020; 13 (23):6453.
Chicago/Turabian StyleSaeed Esfandi; Simin Baloochzadeh; Mohammad Asayesh; Mehdi Ali Ehyaei; Abolfazl Ahmadi; Amir Arsalan Rabanian; Biplab Das; Vitor A. F. Costa; Afshin Davarpanah. 2020. "Energy, Exergy, Economic, and Exergoenvironmental Analyses of a Novel Hybrid System to Produce Electricity, Cooling, and Syngas." Energies 13, no. 23: 6453.
In this study, The General Electric GE90 turbofan engine is thermodynamically simulated MATLAB in both states of using hydrocarbon fuel and hydrogen fuel at the design point conditions. Subsequently, the genetic algorithm is used to determine the best bypass ratio and the best fan pressure ratio in order to obtain optimal performance, environmental, and economic conditions for hydrogen Turbofan, that have been obtained to be 10.2965 and 1.6111, respectively. In the end, the following are observed at the cruise altitude as a result of a change from the hydrocarbon GE90 turbofan to the optimized hydrogen GE90 turbofan: (i). The net thrust force increases by 16.27%. (ii). The thrust-specific fuel consumption decreases by 65.90%. (iii). The thermal efficiency increases by 2.65%. (iv). The propulsive efficiency remains almost unchanged with a mere decrease of 0.2% and provides adequate propulsive conditions. (v). The overall efficiency increases by 2.5%. (vi). The mass flow rate of the fuel decreases by 60.29%. (vii). The total emission of NOx reduces by 68.25% per a specified generated thrust and consumed fuel mass flow rate throughout the cruise phase of the flight cycle. Furthermore, the following are observed at the cruise altitude as a result of a change from the hydrogen GE90 turbofan to the optimized hydrogen GE90 turbofan: (i). The emission of nitrogen oxide for every kilogram of burnt fuel decreases by 3.94%. (ii). The total emission of NOx per a specified mass flow rate of consumed fuel and generated thrust throughout the cruise phase reduces by 16.67%.
Parisa Derakhshandeh; Abolfazl Ahmadi; Reza Dashti. Simulation and technical-economic-environmental optimization of the General Electric GE90 hydrogen turbofan engine. International Journal of Hydrogen Energy 2020, 46, 3303 -3318.
AMA StyleParisa Derakhshandeh, Abolfazl Ahmadi, Reza Dashti. Simulation and technical-economic-environmental optimization of the General Electric GE90 hydrogen turbofan engine. International Journal of Hydrogen Energy. 2020; 46 (5):3303-3318.
Chicago/Turabian StyleParisa Derakhshandeh; Abolfazl Ahmadi; Reza Dashti. 2020. "Simulation and technical-economic-environmental optimization of the General Electric GE90 hydrogen turbofan engine." International Journal of Hydrogen Energy 46, no. 5: 3303-3318.
The ever-increasing consumption of non-renewable energies, including petroleum and gas, besides a decrease in the fossil fuel reserves, necessitates more attention to clean and renewable energy resources more than ever. In these conditions, solar energy is recognized as one of the most reliable options for producing thermal and electric energy. The development of a numerical model for a parabolic solar collector in MATLAB software was carried out in this research. The effect of climate changes on the energy, exergy, and environmental aspects of these systems was investigated by considering an economic approach. The performance of the parabolic solar collector in terms of the Energy-Exergy-Economic-Environmental (4E) was carried out in 5 cities (Rasht, Shiraz, Tehran, Abadan, and Sanandaj) of Iran as a representative of diverse climate. The results of this investigation indicate that the parabolic solar collectors in Shiraz, which has Mediterranean Climate (Csc), has the highest thermal energy efficiency up to 71.97% among these cities. On the other hand, Sanandaj, with Humid Continental Climate (Dsa), enjoys maximum exergy efficiency (22.01%). From an environmental perspective with respect to the cost of CO2 production, Rasht with a Humid Subtropical Climate (Cfa) has an annual cost of $0.75 based on energy and $0.16 based on exergy.
Seyed Farhan Moosavian; Daryoosh Borzuei; Abolfazl Ahmadi. Energy, exergy, environmental and economic analysis of the parabolic solar collector with life cycle assessment for different climate conditions. Renewable Energy 2020, 165, 301 -320.
AMA StyleSeyed Farhan Moosavian, Daryoosh Borzuei, Abolfazl Ahmadi. Energy, exergy, environmental and economic analysis of the parabolic solar collector with life cycle assessment for different climate conditions. Renewable Energy. 2020; 165 ():301-320.
Chicago/Turabian StyleSeyed Farhan Moosavian; Daryoosh Borzuei; Abolfazl Ahmadi. 2020. "Energy, exergy, environmental and economic analysis of the parabolic solar collector with life cycle assessment for different climate conditions." Renewable Energy 165, no. : 301-320.
Due to the harmful effects and depletion of non-renewable energy resources, the major concerns are focused on using renewable energy resources. Among them, the geothermal energy has a high potential in volcano regions such as the Middle East. The optimization of an organic Rankine cycle with a geothermal heat source is investigated based on a genetic algorithm having two stages. In the first stage, the optimal variables are the depth of the well and the extraction flow rate of the geothermal fluid mass. The optimal value of the depth of the well, extraction mass flow rate, and the geothermal fluid temperature is found to be 2100 m, 15 kg/s, and 150 °C. In the second stage, the efficiency and output power of the power plant are optimized. To achieve maximum output power as well as cycle efficiency, the optimization variable is the maximum organic fluid pressure in the high-temperature heat exchanger. The optimum values of energy efficiency and cycle power production are equal to 0.433 MW and 14.1%, respectively.
Mehdi A. Ehyaei; Abolfazl Ahmadi; Marc A. Rosen; Afshin Davarpanah. Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages. Processes 2020, 8, 1277 .
AMA StyleMehdi A. Ehyaei, Abolfazl Ahmadi, Marc A. Rosen, Afshin Davarpanah. Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages. Processes. 2020; 8 (10):1277.
Chicago/Turabian StyleMehdi A. Ehyaei; Abolfazl Ahmadi; Marc A. Rosen; Afshin Davarpanah. 2020. "Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages." Processes 8, no. 10: 1277.
Due to the high amount of natural gas resources in Iran, the gas cycle as one of the main important power production system is used to produce electricity. The gas cycle has some disadvantages such as power consumption of air compressors, which is a major part of gas turbine electrical production and a considerable reduction in electrical power production by increasing the environment temperature due to a reduction in air density and constant volumetric airflow through a gas cycle. To overcome these weaknesses, several methods are applied such as cooling the inlet air of the system by different methods and integration heat recovery steam generator (HRSG) with the gas cycle. In this paper, using a heliostat solar receiver (HSR) in gas and combined cycles are investigated by energy, exergy, and economic analyses in Tehran city. The heliostat solar receiver is used to heat the pressurized exhaust air from the air compressor in gas and combined cycles. The key parameter of the three mentioned analyses was calculated and compared by writing computer code in MATLAB software. Results showed the use of HSR in gas and combined cycles increase the annual average energy efficiency from 28.4% and 48.5% to 44% and 76.5%, respectively. Additionally, for exergy efficiency, these increases are from 29.2% and 49.8% to 45.2% and 78.5%, respectively. However, from an economic point of view, adding the HRSG increases the payback period (PP) and it decreases the net present value (NPV) and internal rate of return (IRR).
S. M. Alizadeh; Arezoo Ghazanfari; Mehdi Aliehyaei; Abolfazal Ahmadi; D. H. Jamali; Navid Nedaei; Afshin Davarpanah. Investigation the Integration of Heliostat Solar Receiver to Gas and Combined Cycles by Energy, Exergy, and Economic Point of Views. Applied Sciences 2020, 10, 5307 .
AMA StyleS. M. Alizadeh, Arezoo Ghazanfari, Mehdi Aliehyaei, Abolfazal Ahmadi, D. H. Jamali, Navid Nedaei, Afshin Davarpanah. Investigation the Integration of Heliostat Solar Receiver to Gas and Combined Cycles by Energy, Exergy, and Economic Point of Views. Applied Sciences. 2020; 10 (15):5307.
Chicago/Turabian StyleS. M. Alizadeh; Arezoo Ghazanfari; Mehdi Aliehyaei; Abolfazal Ahmadi; D. H. Jamali; Navid Nedaei; Afshin Davarpanah. 2020. "Investigation the Integration of Heliostat Solar Receiver to Gas and Combined Cycles by Energy, Exergy, and Economic Point of Views." Applied Sciences 10, no. 15: 5307.
Waste heat recovery from industrial processes has attracted much attention in the energy field in the past few decades. This paper introduces a new configuration of the triple cycle including gas and steam cycles as well as an organic Rankine cycle (ORC), for energy recovery from the hot exhaust gas. Also, the amine carbon capture system (CCS) is used to separate and store carbon dioxide from the hot exhaust gas. For this novel system, energy, exergy, economic, exergoeconomic, and exergoenvironmental (5E) assessments are accomplished. The results reveal that adding steam and ORC cycles to the gas cycle increases the energy and exergy efficiencies to 71.8 and 73.7, respectively. However, integration of the CCS unit to this system reduces energy and exergy efficiencies to 50.5 % and 51.9 %. The economic results for the proposed system show that SPP and PP are both 1.5 years. Moreover, NPV and IRR are found to be 3.13 × 09 $ and 0.68 respectively. Moreover, the carbon capture system (CCS) unit can avoid 627,000 metric tons of CO2 emissions annually.
P. Talebizadehsardari; M.A. Ehyaei; A. Ahmadi; Danial Hamedi Jamali; R. Shirmohammadi; A. Eyvazian; A. Ghasemi; Marc A. Rosen. Energy, exergy, economic, exergoeconomic, and exergoenvironmental (5E) analyses of a triple cycle with carbon capture. Journal of CO2 Utilization 2020, 41, 101258 .
AMA StyleP. Talebizadehsardari, M.A. Ehyaei, A. Ahmadi, Danial Hamedi Jamali, R. Shirmohammadi, A. Eyvazian, A. Ghasemi, Marc A. Rosen. Energy, exergy, economic, exergoeconomic, and exergoenvironmental (5E) analyses of a triple cycle with carbon capture. Journal of CO2 Utilization. 2020; 41 ():101258.
Chicago/Turabian StyleP. Talebizadehsardari; M.A. Ehyaei; A. Ahmadi; Danial Hamedi Jamali; R. Shirmohammadi; A. Eyvazian; A. Ghasemi; Marc A. Rosen. 2020. "Energy, exergy, economic, exergoeconomic, and exergoenvironmental (5E) analyses of a triple cycle with carbon capture." Journal of CO2 Utilization 41, no. : 101258.
This paper brings together the benefits of a membrane-thermal desalination plant with an integrated system containing parabolic trough collectors and wind turbines in collaboration with the electrical network to produce power and freshwater. This proposed cogeneration system was employed for providing power and freshwater in Chabahar in Iran by three types of desalination system consist of the Reverse Osmosis (RO), Multi-effect distillation (MED), and Thermal Vapor Compression (TVC). Through this novel system, the heat generated in the parabolic trough collector is transferred into the organic Rankine cycle (ORC) to produce power. So, the generated power of the organic Rankine cycle and an auxiliary wind turbine can employ by the Reverse Osmosis unit, and the surplus amount of the electricity can sell to the electrical network. This configuration is enabled to increase the stability of the system, and it ultimately reduces the cost of water production by 23%. Besides, the integration of Multi-effect distillation (MED) and Thermal Vapor Compression (TVC) systems enjoys the rejected waste heat from the condenser to increase the produced freshwater. The obtained results from exergy analysis demonstrated that the exergy destruction of the solar collectors and wind turbines contributed by 39.5% and 22.2%, respectively. The results of multi-objective particle swarm optimization reveal that the exergy efficiency and the cost of freshwater production reach to 26.2% and 3.08 US$/m3, each. The environmental assessments of this system demonstrate that this hybrid system prevents the amount of 52164 tons of CO2 emission per year.
Seyed Ali Makkeh; Abolfazl Ahmadi; Farbod Esmaeilion; Mehdi Aliehyaei. Energy, exergy and exergoeconomic optimization of a cogeneration system integrated with parabolic trough collector-wind turbine with desalination. Journal of Cleaner Production 2020, 273, 123122 .
AMA StyleSeyed Ali Makkeh, Abolfazl Ahmadi, Farbod Esmaeilion, Mehdi Aliehyaei. Energy, exergy and exergoeconomic optimization of a cogeneration system integrated with parabolic trough collector-wind turbine with desalination. Journal of Cleaner Production. 2020; 273 ():123122.
Chicago/Turabian StyleSeyed Ali Makkeh; Abolfazl Ahmadi; Farbod Esmaeilion; Mehdi Aliehyaei. 2020. "Energy, exergy and exergoeconomic optimization of a cogeneration system integrated with parabolic trough collector-wind turbine with desalination." Journal of Cleaner Production 273, no. : 123122.
A novel configuration of a coal-fired cogeneration plant is proposed in this paper. This novel system is composed of combustion chamber, Rankine cycle, absorption chiller, alkaline electrolyzer, and methanation plant. In the proposed configuration, the heat of exhaust gas from the combustion chamber can be used in a Rankine cycle to produce electricity. The heat of exhaust gas also powers the absorption chiller to provide cooling. The exhaust gas flows through a sulfur extraction unit to separate sulfur from CO2 gas. To supply electrical power, wind turbines alongside the Rankine cycle are considered. A part of the produced electricity from both the Rankine cycle and the wind turbines can be used by an alkaline electrolyzer to produce hydrogen and oxygen. The CO2 gas from sulfur unit and hydrogen gas (H2) provided by the electrolyzer can be delivered to a methanation unit to produce syngas (CH4) for different applications. The oxygen from the electrolyzer is injected into the combustion chamber to improve the combustion process. Results show that by using 80 units of 1 MW Nordic wind turbine to generate electricity, all of the CO2 in the exhaust gas is converted to syngas. The whole system energy and exergy efficiencies are equal to 16.6% and 16.2%. The highest and lowest energy efficiencies of 85% and 30.1% are related to compressor and steam power plants. The energy and exergy efficiencies of the wind turbine are 30.7% and 11.9%. The system can produce 40920.4 MWh of electricity and 180.5 MWh of cooling. As CO2 is consumed to produce syngas, the proposed system is capable of avoiding a significant amount of 2776 t CO2 emissions while producing 1009.4 t syngas annually. Based on economic analysis, the payback period of the system is 11.2 y, and internal rate of return is found to be 10%, which can prove the viability of the proposed configuration.
Z.X. Li; M.A. Ehyaei; A. Ahmadi; Danial Hamedi Jamali; R. Kumar; Stéphane Abanades. Energy, exergy and economic analyses of new coal-fired cogeneration hybrid plant with wind energy resource. Journal of Cleaner Production 2020, 269, 122331 .
AMA StyleZ.X. Li, M.A. Ehyaei, A. Ahmadi, Danial Hamedi Jamali, R. Kumar, Stéphane Abanades. Energy, exergy and economic analyses of new coal-fired cogeneration hybrid plant with wind energy resource. Journal of Cleaner Production. 2020; 269 ():122331.
Chicago/Turabian StyleZ.X. Li; M.A. Ehyaei; A. Ahmadi; Danial Hamedi Jamali; R. Kumar; Stéphane Abanades. 2020. "Energy, exergy and economic analyses of new coal-fired cogeneration hybrid plant with wind energy resource." Journal of Cleaner Production 269, no. : 122331.
The purpose of this study is to investigate an intergration of three cycles consisting of gas, air bottom and steam cycles for electrical power generation and hydrogen production. The configuration of the three cycles is powered by the natural gas that is used by the gas cycle on the top. Then, the exhaust gas of the gas cycle is used by an air cycle at the bottom of the gas cycle and consequently a heat recovery steam generator (HRSG) is driven by the exhaust gas of the air cycle. The purpose of the HRSG cycle is to produce steam to be used in the reformer for the hydrogen production. The energy, exergy, economic and exergoenvironmental analyses of this combined cycle is examined. The results of this study show that addition of air gas cycle to natural gas cycle improves the energy efficiency from 17.2% to 28.% and Payback Period (PP) from 4.72 to 2.92. Whereas, adding HRSG to the whole cycle improves the energy efficiency to 67.6% and Payback Period to 0.41 years. Moreover, this interagation of the cycles improves the Net Present Value (NPV) from 1.13 × 109 to 2.07 × 109 for gas and air cycle, respectively and to 3.89 × 1010 $ by the whole cycle.
A. Ahmadi; Danial Hamedi Jamali; Mehdi Aliehyaei; Mamdouh El Haj Assad. Energy, exergy, economic and exergoenvironmental analyses of gas and air bottoming cycles for production of electricity and hydrogen with gas reformer. Journal of Cleaner Production 2020, 259, 120915 .
AMA StyleA. Ahmadi, Danial Hamedi Jamali, Mehdi Aliehyaei, Mamdouh El Haj Assad. Energy, exergy, economic and exergoenvironmental analyses of gas and air bottoming cycles for production of electricity and hydrogen with gas reformer. Journal of Cleaner Production. 2020; 259 ():120915.
Chicago/Turabian StyleA. Ahmadi; Danial Hamedi Jamali; Mehdi Aliehyaei; Mamdouh El Haj Assad. 2020. "Energy, exergy, economic and exergoenvironmental analyses of gas and air bottoming cycles for production of electricity and hydrogen with gas reformer." Journal of Cleaner Production 259, no. : 120915.
This study aims to investigate a novel hybrid system for combined cooling and power (CCP) driven by geothermal energy. This study is performed using energy, exergy, and economic analyses. The results of this study show that application of LiBr absorption chiller downstream of the Organic Rankine Cycle (ORC) cycle increases the energy efficiency of the system from 9.3% to 47.3%. But it decreases the exergy efficiency from 15.6% to 4.6%, mainly due to the increase in the exergy destruction of the system. By definition of a new parameter called the electricity and cooling cost for this hybrid system, the results show this parameter decreases from 0.0552 to 0.0028 $/kWh when the LiBr absorption chiller cycle is added. Moreover, a multi-objective optimization of this hybrid system is carried out by the MOPSO algorithm for two objective functions including cost of electricity and cooling (CEC), and exergy efficiency (ηex). The results show that the optimum electricity and cooling cost and exergy efficiency are 0.0033 $/kWh, and 6.8%, respectively.
M.A. Ehyaei; A. Ahmadi; Mamdouh El Haj Assad; Marc A. Rosen. Investigation of an integrated system combining an Organic Rankine Cycle and absorption chiller driven by geothermal energy: Energy, exergy, and economic analyses and optimization. Journal of Cleaner Production 2020, 258, 120780 .
AMA StyleM.A. Ehyaei, A. Ahmadi, Mamdouh El Haj Assad, Marc A. Rosen. Investigation of an integrated system combining an Organic Rankine Cycle and absorption chiller driven by geothermal energy: Energy, exergy, and economic analyses and optimization. Journal of Cleaner Production. 2020; 258 ():120780.
Chicago/Turabian StyleM.A. Ehyaei; A. Ahmadi; Mamdouh El Haj Assad; Marc A. Rosen. 2020. "Investigation of an integrated system combining an Organic Rankine Cycle and absorption chiller driven by geothermal energy: Energy, exergy, and economic analyses and optimization." Journal of Cleaner Production 258, no. : 120780.