Exergy, economic and environmental analysis and multi-objective optimization of a SOFC-GT power plant

Shamoushaki, Moein; Ehyaei, M.A.; Ghanatir, Farrokh

doi:10.1016/j.energy.2017.06.058

Cited by 91 publications

(47 citation statements)

References 23 publications

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“…Their results showed that variable-pressure ORCs deliver a better efficiency compared to constant-pressure ORCs [18]. Also many researches have been developed about energy, exergy, economic and environmental analysis and application in power generation systems both renewable and nonrenewable energy resources [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy, and economic analysis of a new triple-cycle power generation configuration and selection of the optimal working fluid

Zeinodini

Ehyaei

2019

Mechanics & Industry

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The present study investigated energy, exergy and economic analyses on a new triple-cycle power generation configuration. In this configuration, the energy of the exhaust gas and the wasted energy in the condenser of the steam cycle is recovered in the heat recovery steam generator (HRSG) and the evaporator of organic Rankine cycle (ORC), respectively. A computer code was written in MATLAB to analyze the triplecycle configuration. Validation through this program showed that the highest errors were 5.6 and 7.1%, which occurred in gas and steam cycles, respectively. The results revealed that the highest generated entropy was associated with the combustion chamber and the evaporator in the steam cycle. The first and second laws of thermodynamics efficiencies were improved by roughly 270 and 8%, respectively, through adding each of the steam and organic Rankine cycles. The entropy generated by the cycle increased by roughly 400 and 4% by adding the steam and organic Rankine cycles, respectively. The price of the produced electricity was also reduced by roughly 60 and 70%, respectively, for these two cycles.

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Section: Introductionmentioning

confidence: 99%

Energy, exergy, and economic analysis of a new triple-cycle power generation configuration and selection of the optimal working fluid

Zeinodini

Ehyaei

2019

Mechanics & Industry

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“…Sangi et al, Ahmadi et al, and Sahraie et al used the thermoeconomic as the criteria to analyze and optimize a building heating system, a Stirling heat pump, an irreversible three–heat‐source absorption heat pump and a two‐stage irreversible heat pump. Multiobjective optimization, which considers both the thermoeconomic and exergy, is also very common in energy system analysis and aims to improve exergetic efficiency . However, there are some limitations during the application of these criteria.…”

Section: Introductionmentioning

confidence: 99%

“…Multiobjective optimization, which considers both the thermoeconomic and exergy, is also very common in energy system analysis and aims to improve exergetic efficiency. [16][17][18][19][20] However, there are some limitations during the application of these criteria. For instance, the operating conditions of a HTS corresponding to the entropy generation minimization are not always the optimal ones.…”

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confidence: 99%

Operation optimization of variable frequency pumps in compound series‐parallel heat transfer systems based on the power flow method

Shao

Chen

Zhang

2018

Energy Science & Engineering

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The optimal match of multiple operation parameters in heat transfer systems (HTSs) is the key to trade‐off heat transfer and flow resistance for energy conservation. For a compound series‐parallel HTS, this study applies the power flow model and the driving‐resistance model to build the heat transfer and fluid flow constraints of the whole system directly, instead of individual components. Utilizing these constraints together with the Lagrange multiplier method offers the optimal operating frequencies of each variable frequency pumps (VFP) with the minimum pumping power consumptions under different heat loads. Operating the experiment platform with the optimized parameters shows that the heat load increment in parallel branches only needs to increase the operating frequency of VFP in the related hot‐water loop, whereas the heat load increment in series branches needs to increases the operating frequencies of VSPs in both cold‐water and the corresponding hot‐water loops. When the heat load varies from 10 to 11 kW in the parallel branch, the downstream, and the upstream of the series branch, the total pumping power consumptions of all VFPs increase by 19.45%, 43.86%, and 39.99%, respectively. It means assigning the additional heat load in the parallel branch is more energy efficient.

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“…This law provides quantitative information about the level of irreversibility of the system and the amount of useful work destructed through a given process. The Second Law of Thermodynamics is currently widely used in various real world applications such as solar collectors [1,2], power plants [3,4] and desalination system [5,6]. However, its applications to biomedical and micro-thermal systems are still in the early stages and need more investigation.…”

Section: Introductionmentioning

confidence: 99%

Non-Equilibrium Thermodynamic Analysis of Double Diffusive, Nanofluid Forced Convection in Catalytic Microreactors with Radiation Effects

Govone

Torabi

Hunt

et al. 2017

Entropy

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This paper presents a theoretical investigation of the second law performance of double diffusive forced convection in microreactors with the inclusion of nanofluid and radiation effects. The investigated microreactors consist of a single microchannel, fully filled by a porous medium. The transport of heat and mass are analysed by including the thick walls and a first order, catalytic chemical reaction on the internal surfaces of the microchannel. Two sets of thermal boundary conditions are considered on the external surfaces of the microchannel; (1) constant temperature and (2) constant heat flux boundary condition on the lower wall and convective boundary condition on the upper wall. The local thermal non-equilibrium approach is taken to thermally analyse the porous section of the system. The mass dispersion equation is coupled with the transport of heat in the nanofluid flow through consideration of Soret effect. The problem is analytically solved and illustrations of the temperature fields, Nusselt number, total entropy generation rate and performance evaluation criterion (PEC) are provided. It is shown that the radiation effect tends to modify the thermal behaviour within the porous section of the system. The radiation parameter also reduces the overall temperature of the system. It is further demonstrated that, expectedly, the nanoparticles reduce the temperature of the system and increase the Nusselt number. The total entropy generation rate and consequently PEC shows a strong relation with radiation parameter and volumetric concentration of nanoparticles.

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Exergy, economic and environmental analysis and multi-objective optimization of a SOFC-GT power plant

Cited by 91 publications

References 23 publications

Energy, exergy, and economic analysis of a new triple-cycle power generation configuration and selection of the optimal working fluid

Energy, exergy, and economic analysis of a new triple-cycle power generation configuration and selection of the optimal working fluid

Operation optimization of variable frequency pumps in compound series‐parallel heat transfer systems based on the power flow method

Non-Equilibrium Thermodynamic Analysis of Double Diffusive, Nanofluid Forced Convection in Catalytic Microreactors with Radiation Effects

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