Parametric exergy analysis of a tubular Solid Oxide Fuel Cell (SOFC) stack through finite-volume model

Calise, Francesco; Ferruzzi, Gabriele; Vanoli, Laura

doi:10.1016/j.apenergy.2009.03.024

Cited by 49 publications

(20 citation statements)

References 16 publications

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“…Relative cost difference refers to the proportional relationship between the unit exergy economic cost of fuel exergy and the increase of the cost caused by irreversible process, emissions, wearing, and nonenergy costs of system components 35,36 . However, when relative cost difference is calculated in traditional methods, only component improvement potential is judged.…”

Section: Relative Cost Differencementioning

confidence: 99%

Exergoeconomic analysis for crude oil gathering and transportation system in matrix pattern

Cheng

Liu

et al. 2019

Energy Science & Engineering

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Based on exergoeconomic theory, the energy consumption situation for a typical oil transfer station in eastern China is evaluated. According to the analysis of the distribution for logistics and exergy flow, the crude oil gathering and transportation system is divided into two subsystems: pipe network and oil transfer station. The unit exergoeconomic costs for each component exergy flow are calculated by computing method in matrix pattern, of which the pressure exergy and thermal exergy at the end of the process are 812.58 yuan/GJ and 1575.24 yuan/GJ, respectively. Simultaneously, exergoeconomic evaluation indicators such as exergy cost growth coefficient, relative cost difference, and exergoeconomic coefficient are calculated, which can conclude the weak link of technical system is heating furnace equipment. The growth value of its exergy cost growth coefficient is 14.988, the relative cost difference is 94.503, and the exergoeconomic coefficient is 9.046, so it has great potential for energy saving. Exergoeconomic analysis method can provide a scientific and effective method or basis during the energy‐saving reconstruction for oil gathering and transportation system.

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Section: Relative Cost Differencementioning

confidence: 99%

Exergoeconomic analysis for crude oil gathering and transportation system in matrix pattern

Cheng

Liu

et al. 2019

Energy Science & Engineering

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“…Additional algorithms are implemented in order to calculate the most common exergy performance parameters (exergetic efficiency, efficiency defect, etc.). This is a well-established and reliable approach, which was successfully used by the authors for several systems [20][21][22][64][65][66][67]. It is worth noting that the majority of the components included in the system do not involve chemical reactions.…”

Section: Exergy Modelsmentioning

confidence: 99%

“…In fact, the few works cited before regarding similar SACC system only address the energetic balances, neglecting to investigate the sources and the magnitude of the irreversibilities within the plant. Such analysis can be efficiently performed by implementing the well-known technique of the exergy analysis which combines the first and second laws of thermodynamics in order to better analyze irreversibilities [20][21][22]. Exergy analysis was diffusely used in literature in order to investigate the sources and magnitudes of irreversibilities in both solar heating and cooling systems and combined cycle power plants.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

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This paper presents a detailed exergetic analysis of a novel high-temperature Solar Assisted Combined Cycle (SACC) power plant. The system includes a solar field consisting of innovative high-temperature flat plate evacuated solar thermal collectors, a double stage LiBr-H 2 O absorption chiller, pumps, heat exchangers, storage tanks, mixers, diverters, controllers and a simple single-pressure Combined Cycle (CC) power plant. Here, a high temperature solar cooling system is coupled with a conventional combined cycle, in order to pre-cool gas turbine inlet air in order to enhance system efficiency and electrical capacity. In this paper, the system is analyzed from an exergetic point of view, on the basis of an energy-economic model presented in a recent work, where the obtained main results show that SACC exhibits a higher electrical production and efficiency with respect to the conventional CC. The system performance is evaluated by a dynamic simulation, where detailed simulation models are implemented for all the components included in the system. In addition, for all the components and for the system as whole, energy and exergy balances are implemented in order to calculate the magnitude of the irreversibilities within the system. In fact, exergy analysis is used in order to assess: exergy destructions and exergetic efficiencies. Such parameters are used in order to evaluate the magnitude of the irreversibilities in the system and to identify the sources of such irreversibilities. Exergetic efficiencies and exergy destructions are dynamically calculated for the 1-year operation of the system. Similarly, exergetic results are also integrated on weekly and yearly bases in order to evaluate the corresponding irreversibilities. The results showed that the components of the Joule cycle (combustor, turbine and compressor) are the major sources of irreversibilities. System overall exergetic efficiency was around 48%. Average weekly solar collector exergetic efficiency ranged from 6.5% to 14.5%, significantly increasing during the summer season. Conversely, absorption chiller exergy efficiency varies from 7.7% to 20.2%, being higher during the winter season. Combustor exergy efficiency is stably close to 68%, whereas the exergy efficiencies of the remaining components are higher than 80%.

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“…This promises a bright future for hybrid systems in the field of power generation [3,4]. Combining the two plants increases the efficiency level to the range of 65%.With the increasing cost of conventional fuel and the rising price of electricity, hybrid systems are one of the most promising solutions for power generation in the future.…”

Section: Introductionmentioning

confidence: 99%

“…The increasing competition in the research regarding hybrid systems is an indication of the fact that not only this plant proved to be an interesting innovative technology, but also it will be an important remedy for high efficiency and almost clean electrical energy. This promises a bright future for hybrid systems in the field of power generation [3,4].…”

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confidence: 99%

Test Rig for Hybrid System Emulation: New Real‐Time Transient Model Validated in a Wide Operative Range

et al. 2014

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This paper reports an entirely new simulation tool for a hybrid system emulator facility built by the Thermochemical Power Group (TPG) at the University of Genoa, Italy. This new software was developed with the following targets: realtime performance, good stability level and high calculation reliability. In details, to obtain real-time performance a new approach based on 0-D technique was chosen also for components usually analysed with 1-D or 2-D tools (e.g. the recuperator). These are essential key aspects to operate it in hardware-in-the-loop mode or to evaluate predictive results for long transient operations. This work was based on collaboration between the University of Manchester, UK and the University of Genoa, Italy.\ud The activity was carried out with a test rig composed of the following technology: a microturbine package able to produce up to 100 kWe and modified for external connections, external pipes designed for several purposes (by-pass, measurement or bleed), and a high temperature modular vessel necessary to emulate the dimension of an SOFC stack. The real-time transient model of this facility was developed inside the Matlab-Simulink environment with the following modelling approach: a library of components allows to reach a high level of flexibility and an user-friendly approach. This model includes the machine control system as an essential device to analyse further layouts (new components in the rig) and hardware-in-the-loop operations.\ud The experimental data collected in the laboratory by TPG were used to validate the simulation tool. The results calculated with the model were satisfactory compared with experimental data considering both steady-state and transient operations. The most important innovative aspects of this work are related to this wide validation range (not only small power steps, but the whole operative range was considered) obtaining real-time performance and considering microturbine conditions different from standard operations (additional pressure and temperature losses and unusual thermal capacitance). The modelling simplified approach used for such a complex system is an important innovative aspect, because usually the model reliability performance is obtained with more complex (and not real-time) tools. This work is based on an innovative modelling approach based on 0-D tools able to operate in real-time mode (as necessary for hardware-in-the-loop tests) with an accuracy level comparable with more complex and more time consuming software.\ud This validated tool is an important base for future calculations to study innovative hybrid system layouts. For instance, TPG is planning to analyse the option of increasing fuel cell pressure and performance with a booster system (e.g. a turbocharger)

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Parametric exergy analysis of a tubular Solid Oxide Fuel Cell (SOFC) stack through finite-volume model

Cited by 49 publications

References 16 publications

Exergoeconomic analysis for crude oil gathering and transportation system in matrix pattern

Exergoeconomic analysis for crude oil gathering and transportation system in matrix pattern

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Test Rig for Hybrid System Emulation: New Real‐Time Transient Model Validated in a Wide Operative Range

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