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S.M.S. Mahmoudi
Department of Mechanical Engineering, University of Tabriz, Tabriz 51666-14766, Iran

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Journal article
Published: 06 June 2021 in Sustainability
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Based on the benefits of integrated gasification combined cycles (IGCCs), a cogeneration plant for providing electricity and freshwater is proposed. The main novelties of the devised system are the integration of biomass gasification and a regenerative gas turbine with intercooling and a syngas combustor, where the syngas produced in the gasifier is burned in the combustion chamber and fed to a gas turbine directly. The energy discharged from the gas turbine is utilized for further electricity and freshwater generation via Kalina and MED hybridization. The proposed system is analyzed from energy, exergy, exergoeconomic, and reliability–availability viewpoints. The optimal operating condition and optimum performance criteria are obtained by hybridizing an artificial neural network (ANN), the multi-objective particle swarm optimization (MOPSO) algorithm. According to results obtained, for the fourth scenario of the optimization process, optimal values of 45.10%, 14.27 kg·s1, 12.95 USD·GJ1, and 8141 kW are obtained for the exergy efficiency, freshwater production rate, sum unit cost of products, and net output power, respectively. According to reliability and availability assessment, the probability of the healthy working state of all components and subsystems is 88.4403%; the system is shown to be 87.74% available of the time over the 20-year lifetime.

ACS Style

Farzad Hamrang; S. Mahmoudi; Marc Rosen. A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization. Sustainability 2021, 13, 6448 .

AMA Style

Farzad Hamrang, S. Mahmoudi, Marc Rosen. A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization. Sustainability. 2021; 13 (11):6448.

Chicago/Turabian Style

Farzad Hamrang; S. Mahmoudi; Marc Rosen. 2021. "A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization." Sustainability 13, no. 11: 6448.

Journal article
Published: 27 September 2020 in Sustainability
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Integrated biomass gasification combined cycles can be advantageous for providing multiple products simultaneously. A new electricity and freshwater generation system is proposed based on the integrated gasification and gas turbine cycle as the main system, and a steam Rankine cycle and multi-effect desalination system as the waste heat recovery units. To evaluate the performance of the system, energy, exergy, and economic analyses were performed. Also, a parametric analysis was performed to assess the effects of various parameters on the system’s performance criteria. The economic feasibility of the plant was analyzed in terms of net present value. For the base case, the performance metrics are evaluated as Wnet=8.347 MW, ε=46.22%, SUCP=14.07 $/GJ, and mfw=11.7 kg/s. Among all components of the system, the combustion chamber is the greatest contributor to the exergy destruction rate, at 3250 kW. It is shown with the parametric analysis that raising the combustion temperature leads to higher electricity and freshwater production capacity. For a fuel cost of 2 $/GJ and an electricity price of 0.07 $/kWh, the total net present value at the end of plant’s lifespan is 6.547×106 $, and the payback period is 6.75 years. Thus, the plant is feasible from an economic perspective.

ACS Style

Farzad Hamrang; Afshar Shokri; S. M. Seyed Mahmoudi; Biuk Ehghaghi; Marc A. Rosen. Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination. Sustainability 2020, 12, 7996 .

AMA Style

Farzad Hamrang, Afshar Shokri, S. M. Seyed Mahmoudi, Biuk Ehghaghi, Marc A. Rosen. Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination. Sustainability. 2020; 12 (19):7996.

Chicago/Turabian Style

Farzad Hamrang; Afshar Shokri; S. M. Seyed Mahmoudi; Biuk Ehghaghi; Marc A. Rosen. 2020. "Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination." Sustainability 12, no. 19: 7996.

Journal article
Published: 08 January 2020 in Sustainability
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A cogeneration cycle for electric power and refrigeration, using an ammonia-water solution as a working fluid and the geothermal hot water as a heat source, is proposed and investigated. The system is a combination of a modified Kalina cycle (KC) which produces power and an absorption refrigeration cycle (ARC) that generates cooling. Geothermal water is supplied to both the KC boiler and the ARC generator. The system is analyzed from thermodynamic and economic viewpoints, utilizing Engineering Equation Solver (EES) software. In addition, a parametric study is carried out to evaluate the effects of decision parameters on the cycle performance. Furthermore, the system performance is optimized for either maximizing the exergy efficiency (EOD case) or minimizing the total product unit cost (COD case). In the EOD case the exergy efficiency and total product unit cost, respectively, are calculated as 34.7% and 15.8$/GJ. In the COD case the exergy efficiency and total product unit cost are calculated as 29.8% and 15.0$/GJ. In this case, the cooling unit cost, c p , c o o l i n g , and power unit cost, c p , p o w e r , are achieved as 3.9 and 11.1$/GJ. These values are 20.4% and 13.2% less than those obtained when the two products are produced separately by the ARC and KC, respectively. The thermoeconomic analysis identifies the more important components, such as the turbine and absorbers, for modification to improve the cost-effectiveness of the system.

ACS Style

Nima Javanshir; Seyed Mahmoudi S. M.; M. Akbari Kordlar; Marc A. Rosen. Energy and Cost Analysis and Optimization of a Geothermal-Based Cogeneration Cycle Using an Ammonia-Water Solution: Thermodynamic and Thermoeconomic Viewpoints. Sustainability 2020, 12, 484 .

AMA Style

Nima Javanshir, Seyed Mahmoudi S. M., M. Akbari Kordlar, Marc A. Rosen. Energy and Cost Analysis and Optimization of a Geothermal-Based Cogeneration Cycle Using an Ammonia-Water Solution: Thermodynamic and Thermoeconomic Viewpoints. Sustainability. 2020; 12 (2):484.

Chicago/Turabian Style

Nima Javanshir; Seyed Mahmoudi S. M.; M. Akbari Kordlar; Marc A. Rosen. 2020. "Energy and Cost Analysis and Optimization of a Geothermal-Based Cogeneration Cycle Using an Ammonia-Water Solution: Thermodynamic and Thermoeconomic Viewpoints." Sustainability 12, no. 2: 484.

Erratum
Published: 09 November 2019 in International Journal of Refrigeration
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ACS Style

L. Garousi Farshi; C.A. Infante Ferreira; S.M.S. Mahmoudi; M.A. Rosen. Corrigendum to “First and second law analysis of ammonia/salt absorption refrigeration systems” [International Journal of Refrigeration 40 (2014) 111–121]. International Journal of Refrigeration 2019, 109, 210 -211.

AMA Style

L. Garousi Farshi, C.A. Infante Ferreira, S.M.S. Mahmoudi, M.A. Rosen. Corrigendum to “First and second law analysis of ammonia/salt absorption refrigeration systems” [International Journal of Refrigeration 40 (2014) 111–121]. International Journal of Refrigeration. 2019; 109 ():210-211.

Chicago/Turabian Style

L. Garousi Farshi; C.A. Infante Ferreira; S.M.S. Mahmoudi; M.A. Rosen. 2019. "Corrigendum to “First and second law analysis of ammonia/salt absorption refrigeration systems” [International Journal of Refrigeration 40 (2014) 111–121]." International Journal of Refrigeration 109, no. : 210-211.

Journal article
Published: 23 September 2019 in International Journal of Refrigeration
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An air-conditioning system equipped with a latent thermal energy storage is analyzed thermodynamically and economically. A new solution method is introduced and used to solve the phase change problem. In addition, based on the 2-D modified enthalpy method, a numerical solution is carried out. The numerical results are validated using the existing experimental ones. The results obtained from the proposed method are compared with those of the numerical ones for some effective parameters. A maximum difference of 2.7% is obtained between them. By applying the proposed method, the effects of parameters such as the inlet and outlet air temperatures on the operating parameters including the coefficient of performance, exergy efficiency, total product unit cost, total investment cost, phase change material (PCM) slabs’ thickness, and length are investigated. The thermodynamic and economic performances of the overall system are compared for three types of PCMs with identical melting point temperatures, namely; RT27, S27 and PureTemp27. It is shown that the total product unit cost decreases as the air temperature difference in passing through the air-conditioning system increases. This occurs in spite of the increment of investment cost because of the thermal efficiency enhancement. In the proposed method, the desired output can be obtained at any time and location with no need to previous time steps and other discretized points. This improves the optimization process for the system. The results show that, compared to the other PCM types, the PureTemp27 brings about better thermodynamic and thermoeconomic performances for the system.

ACS Style

A.D. Akbari; F. Talati; S.M.S. Mahmoudi. New solution method for latent energy storage and thermoeconomic optimization for an air conditioning system. International Journal of Refrigeration 2019, 109, 12 -24.

AMA Style

A.D. Akbari, F. Talati, S.M.S. Mahmoudi. New solution method for latent energy storage and thermoeconomic optimization for an air conditioning system. International Journal of Refrigeration. 2019; 109 ():12-24.

Chicago/Turabian Style

A.D. Akbari; F. Talati; S.M.S. Mahmoudi. 2019. "New solution method for latent energy storage and thermoeconomic optimization for an air conditioning system." International Journal of Refrigeration 109, no. : 12-24.

Journal article
Published: 21 June 2019 in International Journal of Hydrogen Energy
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A comprehensive thermoeconomic analysis is presented for a novel integrated solar hydrogen energy system for standalone operation. The proposed system includes a solar PVT module (photovoltaic thermal), a FC (Fuel cell) and a battery to meet the electrical load demand and domestic hot water over a year. The PVT component works as a primary energy source converting solar energy into electricity and heat. The excess electrical energy and hot water produced by PVT are consumed for producing hydrogen, which can be stored. The generated hydrogen is fed to the fuel cell to produce electricity and water to satisfy the demand. The proposed system is convenient for different seasons of the year because in all time, produced power satisfy the demand. The first and second laws of thermodynamics are used to evaluate the performance of each component and the overall system. Economic assessment of this system is also conducted considering the net present cost, and the system performance is optimized based on this parameter. The overall electrical efficiency of the system is obtained as 9% and the levelized cost of electricity is determined as $ 0.286/kWh. For a steady operation of system, integrating a battery system is convenient when solar energy is not available for a short term. When there is a longer-term shortage of solar radiation, up to 8 days, the electricity can be supplied by utilizing the hydrogen storage system.

ACS Style

Moharrm Jafari; Davoud Armaghan; S.M. Seyed Mahmoudi; Ata Chitsaz. Thermoeconomic analysis of a standalone solar hydrogen system with hybrid energy storage. International Journal of Hydrogen Energy 2019, 44, 19614 -19627.

AMA Style

Moharrm Jafari, Davoud Armaghan, S.M. Seyed Mahmoudi, Ata Chitsaz. Thermoeconomic analysis of a standalone solar hydrogen system with hybrid energy storage. International Journal of Hydrogen Energy. 2019; 44 (36):19614-19627.

Chicago/Turabian Style

Moharrm Jafari; Davoud Armaghan; S.M. Seyed Mahmoudi; Ata Chitsaz. 2019. "Thermoeconomic analysis of a standalone solar hydrogen system with hybrid energy storage." International Journal of Hydrogen Energy 44, no. 36: 19614-19627.

Journal article
Published: 18 June 2019 in Sustainability
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In this study, a cooling/power cogeneration cycle consisting of vapor-compression refrigeration and organic Rankine cycles is proposed and investigated. Utilizing geothermal water as a low-temperature heat source, various operating fluids, including R134a, R22, and R143a, are considered for the system to study their effects on cycle performance. The proposed cycle is modeled and evaluated from thermodynamic and thermoeconomic viewpoints by the Engineering Equation Solver (EES) software. Thermodynamic properties as well as exergy cost rates for each stream are found separately. Using R143a as the working fluid, thermal and exergy efficiencies of 27.2% and 57.9%, respectively, are obtained for the cycle. Additionally, the total product unit cost is found to be 60.7 $/GJ. A parametric study is carried out to determine the effects of several parameters, such as turbine inlet pressure, condenser temperature and pressure, boiler inlet air temperature, and pinch-point temperature difference, on the cycle performance. The latter is characterized by such parameters as thermal and exergy efficiencies, refrigeration capacity, produced net power rate, exergy destruction rate, and the production unit cost rates. The results indicate that the system using R134a exhibits the lowest thermal and exergy efficiencies among other working fluids, while the systems using R22 and R143a exhibit the highest energy and exergy efficiencies, respectively. The boiler and turbine contribute the most to the total exergy destruction rate.

ACS Style

Nima Javanshir; S. M. Seyed Mahmoudi; Marc A. Rosen. Thermodynamic and Exergoeconomic Analyses of a Novel Combined Cycle Comprised of Vapor-Compression Refrigeration and Organic Rankine Cycles. Sustainability 2019, 11, 3374 .

AMA Style

Nima Javanshir, S. M. Seyed Mahmoudi, Marc A. Rosen. Thermodynamic and Exergoeconomic Analyses of a Novel Combined Cycle Comprised of Vapor-Compression Refrigeration and Organic Rankine Cycles. Sustainability. 2019; 11 (12):3374.

Chicago/Turabian Style

Nima Javanshir; S. M. Seyed Mahmoudi; Marc A. Rosen. 2019. "Thermodynamic and Exergoeconomic Analyses of a Novel Combined Cycle Comprised of Vapor-Compression Refrigeration and Organic Rankine Cycles." Sustainability 11, no. 12: 3374.

Journal article
Published: 13 June 2019 in Sustainability
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Comprehensive exergy and exergoeconomic assessments are reported for a proposed power producing system, in which an organic Rankine cycle is employed to utilize the waste heat from the fuel cell stack. A complete mathematical model is presented for simulating the system performance while considering water management in the fuel cell. The simulation is performed for individual components of the fuel cell system, e.g., the compressor and humidifiers. A parametric study is conducted to evaluate the effects on the system’s thermodynamic and economic performance of parameters, such as the fuel cell operating pressure, current density, and turbine back pressure. The results show that an increase in the fuel cell operating pressure leads to a higher exergy efficiency and exergoeconomic factor for the overall system. In addition, it is observed that the overall exergy efficiency is 4.16% higher than the corresponding value that is obtained for the standalone fuel cell for the same value of fuel cell operating pressure. Furthermore, the results indicate that the compressor and condenser exhibit the worst exergoeconomic performance and that the exergoeconomic factor, the capital cost rate and the exergy destruction cost rate for the overall system are 40.8%, 27.21 $/h, and 39.49 $/h, respectively.

ACS Style

S. M. Seyed Mahmoudi; Niloufar Sarabchi; Mortaza Yari; Marc A. Rosen. Exergy and Exergoeconomic Analyses of a Combined Power Producing System including a Proton Exchange Membrane Fuel Cell and an Organic Rankine Cycle. Sustainability 2019, 11, 3264 .

AMA Style

S. M. Seyed Mahmoudi, Niloufar Sarabchi, Mortaza Yari, Marc A. Rosen. Exergy and Exergoeconomic Analyses of a Combined Power Producing System including a Proton Exchange Membrane Fuel Cell and an Organic Rankine Cycle. Sustainability. 2019; 11 (12):3264.

Chicago/Turabian Style

S. M. Seyed Mahmoudi; Niloufar Sarabchi; Mortaza Yari; Marc A. Rosen. 2019. "Exergy and Exergoeconomic Analyses of a Combined Power Producing System including a Proton Exchange Membrane Fuel Cell and an Organic Rankine Cycle." Sustainability 11, no. 12: 3264.

Journal article
Published: 05 April 2019 in Energy Conversion and Management
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Designing energy conversion systems with high efficiencies and low pollutant emission is essential for sustainable development. A new cogeneration system including a high-temperature proton exchange membrane fuel cell, integrated with a solar methanol steam reformer, and a Kalina cycle is proposed to produce electricity and heat. Using energy, exergy and cost balance, the proposed system is analyzed from the viewpoints of exergy, economy, and environmental impact. A Parametric study is performed and shows that a higher fuel cell temperature is in favor of the total product unit cost and carbon dioxide mass specific emission. Also, the exergy efficiency is maximized, and the total product unit cost as well as the carbon dioxide mass specific emission are minimized at some specific values of anode recirculation ratio. Optimization results show that the average daily exergy efficiency can increase by up to 29.3% and the total product unit cost as well as the carbon dioxide mass specific emission can decrease by up to 17.72% and 16.3%, respectively compared to the corresponding values under the base conditions. It is concluded that combining a Kalina cycle with a high-temperature proton exchange membrane fuel cell along with utilizing solar energy for reforming process yields an efficient energy conversion system with low emission.

ACS Style

N. Sarabchi; S.M. Seyed Mahmoudi; Mortaza Yari; A. Farzi. Exergoeconomic analysis and optimization of a novel hybrid cogeneration system: High-temperature proton exchange membrane fuel cell/Kalina cycle, driven by solar energy. Energy Conversion and Management 2019, 190, 14 -33.

AMA Style

N. Sarabchi, S.M. Seyed Mahmoudi, Mortaza Yari, A. Farzi. Exergoeconomic analysis and optimization of a novel hybrid cogeneration system: High-temperature proton exchange membrane fuel cell/Kalina cycle, driven by solar energy. Energy Conversion and Management. 2019; 190 ():14-33.

Chicago/Turabian Style

N. Sarabchi; S.M. Seyed Mahmoudi; Mortaza Yari; A. Farzi. 2019. "Exergoeconomic analysis and optimization of a novel hybrid cogeneration system: High-temperature proton exchange membrane fuel cell/Kalina cycle, driven by solar energy." Energy Conversion and Management 190, no. : 14-33.

Journal article
Published: 26 November 2018 in Renewable Energy
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A novel combined cooling/power cogeneration system, including a modified Kalina cycle and an absorption refrigeration cycle is proposed. The cycle uses ammonia-water as working fluid and is driven by geothermal energy. The cycle is flexible for producing different ratios of power to cooling capacities. It is observed that the ambient temperature and the split mass flow ratio at the condenser exit play major roles on the system performance. The results show that in summer time a better economic performance and also a higher cooling to power ratio is achieved. It is also seen that the overall system exergy efficiency is maximized at a specific value of the split mass flow ratio and that the total product unit cost is minimized at some specific values of the generator temperature and split mass flow ratio. The system performance is optimized considering the exergy efficiency and total product unit cost as criteria. The optimization results show that when the criterion is selected as exergy efficiency, a better economic performance is also achieved for the system. It is found that the highest exergy efficiency of the system is achieved as 33.61% and the lowest total product unit cost is obtained as $ 39.93/GJ.

ACS Style

M. Akbari Kordlar; S.M.S. Mahmoudi; F. Talati; Mortaza Yari; Amirhossein Mosaffa. A new flexible geothermal based cogeneration system producing power and refrigeration, part two: The influence of ambient temperature. Renewable Energy 2018, 134, 875 -887.

AMA Style

M. Akbari Kordlar, S.M.S. Mahmoudi, F. Talati, Mortaza Yari, Amirhossein Mosaffa. A new flexible geothermal based cogeneration system producing power and refrigeration, part two: The influence of ambient temperature. Renewable Energy. 2018; 134 ():875-887.

Chicago/Turabian Style

M. Akbari Kordlar; S.M.S. Mahmoudi; F. Talati; Mortaza Yari; Amirhossein Mosaffa. 2018. "A new flexible geothermal based cogeneration system producing power and refrigeration, part two: The influence of ambient temperature." Renewable Energy 134, no. : 875-887.

Journal article
Published: 05 September 2018 in Energy Conversion and Management
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Semi-transparent photovoltaic (STPV) system’s performance strongly depends on its surface temperature. To provide a mechanism that decrease the temperature of STPV can improve the power generation significantly. This cooling mechanism will be more interesting if it needs no additional energy. In this paper a novel solar chimney system is proposed to cool a STPV system. The STPV is employed as a roof for the solar chimney and an air flow generated by the solar chimney cools the STPV. Based on the energy balance for three main components: STPV, air and ground, a theoretical model is developed for the proposed system. Convection heat transfer coefficients are calculated precisely for the heat transfers taking place in the system and the obtained results for the solar chimney are compared with the existing experimental data in literature. Results of proposed model have a good agreement with the previous data. It’s shown that there is an optimum packing factor that maximizes the generated power for each radiation intensity. It is observed that the proposed system effectiveness depends on the radiation intensity as well as on the structural parameters. The proposed system can reduce the average temperature of the STPV up to 15 °C. It is concluded that, by cooling the STPV power plant with the solar chimney for a solar radiation of 500 W/m2, an enhancement of about 29% in power generation is gained.

ACS Style

Siamak Jamali; Mortaza Yari; S.M.S. Mahmoudi. Enhanced power generation through cooling a semi-transparent PV power plant with a solar chimney. Energy Conversion and Management 2018, 175, 227 -235.

AMA Style

Siamak Jamali, Mortaza Yari, S.M.S. Mahmoudi. Enhanced power generation through cooling a semi-transparent PV power plant with a solar chimney. Energy Conversion and Management. 2018; 175 ():227-235.

Chicago/Turabian Style

Siamak Jamali; Mortaza Yari; S.M.S. Mahmoudi. 2018. "Enhanced power generation through cooling a semi-transparent PV power plant with a solar chimney." Energy Conversion and Management 175, no. : 227-235.

Chapter
Published: 05 August 2018 in Smart and Sustainable Planning for Cities and Regions
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The main purpose of this paper is to introduce and investigate thermodynamic performance of a new combined power and cooling cogeneration cycle. In this cycle a hydrogen-fed solid oxide fuel cell (SOFC) and a gas turbine are used for power generation, and a generator-absorber heat exchange (GAX) absorption refrigeration system is used to produce cooling. Electrochemical equations for fuel cell and thermodynamic relations for components are solved simultaneously using the Engineering Equation Solver (EES). The simulation results are validated using the previously published data in literature. The comparison shows a good agreement between them with an error of less than 4%. The effects on the system performance are investigated of such decision parameters like current density and pressure ratio. The results show that for the same condition, the energy and exergy efficiencies of the proposed cycle are 52.29% and 4.61% higher than those of the stand-alone fuel cell, respectively. Fuel cell stack, afterburner, and generator/absorber assembly contribute the most in the overall exergy destruction in the cycle.

ACS Style

L. Khani; S. M. S. Mahmoudi; A. Chitsaz. Energy and Exergy Analysis of a Novel Combined Power/Cooling Production Cycle Based on Solid Oxide Fuel Cell. Smart and Sustainable Planning for Cities and Regions 2018, 1293 -1309.

AMA Style

L. Khani, S. M. S. Mahmoudi, A. Chitsaz. Energy and Exergy Analysis of a Novel Combined Power/Cooling Production Cycle Based on Solid Oxide Fuel Cell. Smart and Sustainable Planning for Cities and Regions. 2018; ():1293-1309.

Chicago/Turabian Style

L. Khani; S. M. S. Mahmoudi; A. Chitsaz. 2018. "Energy and Exergy Analysis of a Novel Combined Power/Cooling Production Cycle Based on Solid Oxide Fuel Cell." Smart and Sustainable Planning for Cities and Regions , no. : 1293-1309.

Journal article
Published: 01 August 2018 in Renewable Energy
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A new cooling/power cogeneration system is proposed, analyzed and optimized from the viewpoints of thermoeconomics. The system uses geothermal water as a heat source and ammonia-water solution as a working fluid. It is an internally interacting combination of a modified Kalina and an absorption refrigeration cycles. A sensitivity analysis is performed to assess the influences of important parameters on the exergeoconomic performance of the system prior to optimizing its performance. It is shown that the mass flow division at the condenser exit plays an important role on the system performance. The optimization is performed for maximum exergy efficiency (case1), and minimum total product unit cost (case2). The results show that the total product unit cost for case 2 is around 17% lower than that for case 1 at the expense of 11.8% reduction in the second law efficiency. Similarly, it is observed that the second law efficiency for case 1 is around 13.4% higher than that for case 2 at the expense of 20.52% increase in the total product unit cost. It is found that, under studied conditions, the highest exergy efficiency and the lowest total product unit cost for system are obtained as 34.8% and $24.5/GJ, respectively.

ACS Style

S.M.S. Mahmoudi; M. Akbari Kordlar. A new flexible geothermal based cogeneration system producing power and refrigeration. Renewable Energy 2018, 123, 499 -512.

AMA Style

S.M.S. Mahmoudi, M. Akbari Kordlar. A new flexible geothermal based cogeneration system producing power and refrigeration. Renewable Energy. 2018; 123 ():499-512.

Chicago/Turabian Style

S.M.S. Mahmoudi; M. Akbari Kordlar. 2018. "A new flexible geothermal based cogeneration system producing power and refrigeration." Renewable Energy 123, no. : 499-512.

Journal article
Published: 01 July 2018 in Energy Conversion and Management
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A modified form of hybrid method for advanced exergy analysis is introduced and applied to an anode gas recirculation solid oxide fuel cell system. The results are compared with the corresponding values achieved from applying the well-known engineering method of advanced exergy analysis to the system. The modified hybrid method proved to be accurate and less time consuming and also, in contrast with the hybrid method introduced in literature, doesn’t require the violation of the conservation of mass or exergy balance. In addition the modified hybrid method is more appropriate for parametric studies and optimization of energy conversion systems. The results obtained from both the advanced exergy methods are found to agree with one another and differ from those obtained from conventional exergy analysis. The values of endogenous and unavoidable endogenous exergy destruction rates for modified hybrid method are approximately 4% higher than the corresponding values obtained by the engineering method. The unavoidable conditions required for the analyses in both methods are obtained by a micro-structure analysis showing that the energy and exergy efficiencies of the system, under unavoidable conditions can be higher by up to 26%, 24.8%, respectively, compared to the corresponding values under the real conditions. As the highest avoidable endogenous exergy destruction rates occur in the inverter, 6.6 kW, and the stack, 3.7 kW, more attention should be paid to these components when the system performance is to be optimized. A different order, however, is achieved by applying the conventional exergy analysis.

ACS Style

M. Fallah; S. Mohammad S. Mahmoudi; M. Yari. A comparative advanced exergy analysis for a solid oxide fuel cell using the engineering and modified hybrid methods. Energy Conversion and Management 2018, 168, 576 -587.

AMA Style

M. Fallah, S. Mohammad S. Mahmoudi, M. Yari. A comparative advanced exergy analysis for a solid oxide fuel cell using the engineering and modified hybrid methods. Energy Conversion and Management. 2018; 168 ():576-587.

Chicago/Turabian Style

M. Fallah; S. Mohammad S. Mahmoudi; M. Yari. 2018. "A comparative advanced exergy analysis for a solid oxide fuel cell using the engineering and modified hybrid methods." Energy Conversion and Management 168, no. : 576-587.

Journal article
Published: 05 June 2018 in Journal of Cleaner Production
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Two configurations of double-flash geothermal power plants, one is combined with water desalination and one integrated with absorption heat transformation and water desalination, are proposed and investigated from the viewpoint of exergoeconomics. The main purpose of investigated systems is the simultaneous generation of electrical power and distilled water. A three-objective optimization procedure is performed to determine the optimal design points, considering for all configurations the decision parameters to be the pressures of low and high-pressure flash chambers and the temperatures of the evaporator and generator. The optimization aims to minimize the product unit cost, while maximizing the electric power generated and the production rate of distilled water. The Pareto frontiers for each configuration are drawn as part of the procedure. It is shown that, at constant and equal pressures of the high-pressure flash chamber, the product unit cost for the system combined with the absorption heat transformer is the lower of the two systems considered. In addition, under the optimized conditions, the product unit costs are approximately equal for the two studied configurations. However, the value of generated power for the system with an absorption heat transformer is about 17% greater than for the alternate system. Moreover, the system integrated with an absorption heat transformer has higher thermal and exergy efficiencies, at about 20% and 3%, respectively.

ACS Style

S. Salehi; S. Mohammad S. Mahmoudi; Mortaza Yari; M.A. Rosen. Multi-objective optimization of two double-flash geothermal power plants integrated with absorption heat transformation and water desalination. Journal of Cleaner Production 2018, 195, 796 -809.

AMA Style

S. Salehi, S. Mohammad S. Mahmoudi, Mortaza Yari, M.A. Rosen. Multi-objective optimization of two double-flash geothermal power plants integrated with absorption heat transformation and water desalination. Journal of Cleaner Production. 2018; 195 ():796-809.

Chicago/Turabian Style

S. Salehi; S. Mohammad S. Mahmoudi; Mortaza Yari; M.A. Rosen. 2018. "Multi-objective optimization of two double-flash geothermal power plants integrated with absorption heat transformation and water desalination." Journal of Cleaner Production 195, no. : 796-809.

Journal article
Published: 13 April 2018 in Sustainability
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An ejector-expansion refrigeration cycle using nitrous oxide was assessed. Thermodynamic analyses, including energy and exergy analyses, were carried out to investigate the effects on performance of several key factors in the system. The results show that the ejector-expansion refrigeration cycle (EERC) has a higher maximum coefficient of performance and exergy efficiency than the internal heat exchanger cycle (IHEC), by 12% and 15%, respectively. The maximum coefficient of performance and exergy efficiency are 14% and 16.5% higher than the corresponding values for the vapor-compression refrigeration cycle (VCRC), respectively. The total exergy destruction for the N2O ejector-expansion cycle is 63% and 53% less than for IHEC and VCRC, respectively. Furthermore, the highest COPs for the vapor-compression refrigeration, the internal heat exchanger and the ejector-expansion refrigeration cycles correspond to a high side pressure of 7.3 MPa, and the highest COPs for the three types of CO2 refrigeration cycles correspond to a high side pressure of 8.5 MPa. Consequently, these lead to a lower electrical power consumption by the compressor.

ACS Style

Damoon Aghazadeh Dokandari; S. M. S. Mahmoudi; M. Bidi; Ramin Haghighi Khoshkhoo; Marc A. Rosen. First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector. Sustainability 2018, 10, 1177 .

AMA Style

Damoon Aghazadeh Dokandari, S. M. S. Mahmoudi, M. Bidi, Ramin Haghighi Khoshkhoo, Marc A. Rosen. First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector. Sustainability. 2018; 10 (4):1177.

Chicago/Turabian Style

Damoon Aghazadeh Dokandari; S. M. S. Mahmoudi; M. Bidi; Ramin Haghighi Khoshkhoo; Marc A. Rosen. 2018. "First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector." Sustainability 10, no. 4: 1177.

Journal article
Published: 20 January 2018 in Journal of Cleaner Production
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A natural gas firing and biomass post-firing combined cycle is proposed and analyzed with thermodynamics and exergoeconomics. To enhance performance, hydrogen is produced in a proton exchange membrane electrolyzer and when there is temporarily no market for hydrogen is injected into the combustion chamber of the natural gas firing and biomass post-firing combined cycle with hydrogen injection. Advantages and disadvantages are reported for the cycle with hydrogen injection (NFBPC-HI) relative to the cycle without hydrogen injection (NFBPC-H) with an equivalent biomass flow rate. In this case, the natural gas flow rate reduces by 46% through hydrogen injection. The plant energy efficiency with hydrogen injection decreases by 36% and the exergy efficiency by 37%. The exergy destruction rate decreases and the exergy loss rate becomes slightly lower with hydrogen injection. Regarding environmental impact, hydrogen injection decreases the plant CO2 emission rate by 27%. Also with hydrogen injection, the exergy destruction cost rate decreases and the exergy loss cost rate declines slightly. The product cost using hydrogen injection decreases by up to 9% point as does the exergoeconomic factor for the biomass integrated post-firing combined cycle with hydrogen injection, especially at higher gas turbine inlet temperatures and lower compressor pressure ratios. Overall, the plant with hydrogen injection exhibits some better facets of thermodynamic and economic performance and cleaner production, e.g. lower exergy destruction and loss rates and CO2 emissions and lower total unit product economic costs, although it has lower energy and exergy efficiencies.

ACS Style

Anahita Moharamian; Saeed Soltani; Marc A. Rosen; S.M.S. Mahmoudi; Tatiana Morosuk. Exergoeconomic analysis of natural gas fired and biomass post-fired combined cycle with hydrogen injection into the combustion chamber. Journal of Cleaner Production 2018, 180, 450 -465.

AMA Style

Anahita Moharamian, Saeed Soltani, Marc A. Rosen, S.M.S. Mahmoudi, Tatiana Morosuk. Exergoeconomic analysis of natural gas fired and biomass post-fired combined cycle with hydrogen injection into the combustion chamber. Journal of Cleaner Production. 2018; 180 ():450-465.

Chicago/Turabian Style

Anahita Moharamian; Saeed Soltani; Marc A. Rosen; S.M.S. Mahmoudi; Tatiana Morosuk. 2018. "Exergoeconomic analysis of natural gas fired and biomass post-fired combined cycle with hydrogen injection into the combustion chamber." Journal of Cleaner Production 180, no. : 450-465.

Journal article
Published: 12 December 2017 in International Journal of Hydrogen Energy
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A hydrogen production unit is successfully integrated with an externally fired combined cycle using biomass fuel. The hydrogen produced in an electrolyzer can be used for other purposes, but when there is temporarily no market for it is injected into the combustion chamber of an externally fired combined cycle. Injecting hydrogen into the combustion chamber was found to reduce fuel consumption by almost 27%. Moreover, hydrogen injection decreased the energy efficiency and exergy efficiency by 45%, and decreased both the exergy loss and exergy destruction rates. Meanwhile, CO2 emissions decreased by 32%. However, there are some disadvantages to hydrogen injection, especially from the viewpoint of exergoeconomics. The total unit product cost for the externally fired combined cycle with hydrogen injection is almost 27% more than the unit without hydrogen injection, although the exergy loss and destruction costs decreased with hydrogen injection. The value of the relative cost difference with hydrogen injection rises by 40%. Also the exergoeconomic assessment demonstrates that the cost of components (purchase and maintenance) are higher than cost of components' exergy destruction for both cycles, i.e., with and without hydrogen injection. As the compressor pressure ratio increases, optimal points are identified for biomass flow rate, energy and exergy efficiencies, exergy destruction and loss rates, exergy destruction and loss exergy cost rates, total unit product cost and relative cost difference.

ACS Style

Anahita Moharamian; Saeed Soltani; Marc A. Rosen; S.M.S. Mahmoudi. Exergoeconomic and thermodynamic analyses of an externally fired combined cycle with hydrogen production and injection to the combustion chamber. International Journal of Hydrogen Energy 2017, 43, 781 -792.

AMA Style

Anahita Moharamian, Saeed Soltani, Marc A. Rosen, S.M.S. Mahmoudi. Exergoeconomic and thermodynamic analyses of an externally fired combined cycle with hydrogen production and injection to the combustion chamber. International Journal of Hydrogen Energy. 2017; 43 (2):781-792.

Chicago/Turabian Style

Anahita Moharamian; Saeed Soltani; Marc A. Rosen; S.M.S. Mahmoudi. 2017. "Exergoeconomic and thermodynamic analyses of an externally fired combined cycle with hydrogen production and injection to the combustion chamber." International Journal of Hydrogen Energy 43, no. 2: 781-792.

Journal article
Published: 01 December 2017 in Energy
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ACS Style

M. Fallah; S.M.S. Mahmoudi; M. Yari. Advanced exergy analysis for an anode gas recirculation solid oxide fuel cell. Energy 2017, 141, 1097 -1112.

AMA Style

M. Fallah, S.M.S. Mahmoudi, M. Yari. Advanced exergy analysis for an anode gas recirculation solid oxide fuel cell. Energy. 2017; 141 ():1097-1112.

Chicago/Turabian Style

M. Fallah; S.M.S. Mahmoudi; M. Yari. 2017. "Advanced exergy analysis for an anode gas recirculation solid oxide fuel cell." Energy 141, no. : 1097-1112.

Journal article
Published: 01 August 2017 in Energy Conversion and Management
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ACS Style

A.D. Akbari; S.M.S. Mahmoudi. Thermoeconomic performance and optimization of a novel cogeneration system using carbon dioxide as working fluid. Energy Conversion and Management 2017, 145, 265 -277.

AMA Style

A.D. Akbari, S.M.S. Mahmoudi. Thermoeconomic performance and optimization of a novel cogeneration system using carbon dioxide as working fluid. Energy Conversion and Management. 2017; 145 ():265-277.

Chicago/Turabian Style

A.D. Akbari; S.M.S. Mahmoudi. 2017. "Thermoeconomic performance and optimization of a novel cogeneration system using carbon dioxide as working fluid." Energy Conversion and Management 145, no. : 265-277.