Exergetic performance coefficient analysis of a simple fuel cell system

Akkaya, Ali Volkan; Şahi̇n, Bahri̇; Erdem, Hasan Hüseyin

doi:10.1016/j.ijhydene.2007.03.038

Cited by 76 publications

(32 citation statements)

References 36 publications

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“…The programming environment was MATLAB. Simplified models similar to the ones used in references [26][27][28] have been used for the turbo machines as well as for heat exchangers, since the focus was given to compare the exergetic performance of a SOFC alone or incorporated with a GT rather than to investigate part load behavior of a SOFC-GT system.…”

Section: System Modelingmentioning

confidence: 99%

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

et al. 2012

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Abstract:In the present work, an ethanol fed Solid Oxide Fuel Cell-Gas Turbine (SOFC-GT) system has been parametrically analyzed in terms of exergy and compared with a single SOFC system. The solid oxide fuel cell was fed with hydrogen produced from ethanol steam reforming. The hydrogen utilization factor values were kept between 0.7 and 1. The SOFC's Current-Volt performance was considered in the range of 0.1-3 A/cm 2 at 0.9-0.3 V, respectively, and at the intermediate operating temperatures of 550 and 600 °C, respectively. The curves used represent experimental results obtained from the available bibliography. Results indicated that for low current density values the single SOFC system prevails over the SOFC-GT hybrid system in terms of exergy efficiency, while at higher current density values the latter is more efficient. It was found that as the value of the utilization factor increases the SOFC system becomes more efficient than the SOFC-GT system over a wider range of current density values. It was also revealed that at high current density values the increase of SOFC operation temperature leads in both cases to higher system efficiency values.

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Section: System Modelingmentioning

confidence: 99%

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

et al. 2012

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“…4) The anode residual fuel is completely combusted in the afterburner, and the heat and pressure losses of all the heat exchanger units are neglected. 5) The performance of each single cell in the stack keeps the same with the neglected differentials in current and voltage, the temperatures of both the anode and cathode exhaust gases are the same with the cell stack operating temperature [20].…”

Section: Mcfc Modelmentioning

confidence: 99%

Study on CO 2 capture from molten carbonate fuel cell hybrid system integrated with oxygen ion transfer membrane

Duan

Yue

et al. 2015

Energy

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“…A new exergetic criterion called exergetic performance coefficient (EPC) allows evaluating the influence of irreversibility in the system on the performance and can be formulated as follows [18].…”

Section: Mass Energy and Exergy Balance Equations And Performance Anmentioning

confidence: 99%

Exergetic performance evaluation of heat pump systems having various heat sources

Di̇ki̇ci̇

Akbulut

2008

Int. J. Energy Res.

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SUMMARYIn this study heat pump systems having different heat sources were investigated experimentally. Solar-assisted heat pump (SAHP), ground source heat pump (GSHP) and air source heat pump (ASHP) systems for domestic heating were tested. Additionally, their combination systems, such as solar-assisted-ground source heat pump (SAGSHP), solar-assisted-air source heat pump (SAASHP) and ground-air source heat pump (GSASHP) were tested. All the heat pump systems were designed and constructed in a test room with 60 m 2 floor area in Firat University, Elazig (38:418N; 39:148E), Turkey. In evaluating the efficiency of heat pump systems, the most commonly used measure is the energy or the first law efficiency, which is modified to a coefficient of performance for heat pump systems. However, for indicating the possibilities for thermodynamic improvement, inadequate energy analysis and exergy analysis are needed. This study presents an exergetic evaluation of SAHP, GSHP and ASHP and their combination systems. The exergy losses in each of the components of the heat pump systems are determined for average values of experimentally measured parameters. Exergy efficiency in each of the components of the heat pump systems is also determined to assess their performances. The coefficient of performance (COP) of the SAHP, GSHP and ASHP were obtained as 2.95, 2.44 and 2.33, whereas the exergy losses of the refrigerant subsystems were found to be 1.342, 1.705 and 1.942 kW, respectively. The COP of SAGSHP, SAASHP and GSASHP as multiple source heat pump systems were also determined to be 3.36, 2.90 and 2.14, whereas the exergy losses of the refrigerant subsystems were approximately 2.13, 2.996 and 3.113 kW, respectively. In addition, multiple source heat pump systems were compared with single source heat pump systems on the basis of the COP. Exergetic performance coefficient (EPC) is introduced and is applied to the heat pump systems having various heat sources. The results imply that the functional forms of the EPC and first law efficiency are different. Results show that Ex loss;total becomes a minimum value when EPC has a maximum value.

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Exergetic performance coefficient analysis of a simple fuel cell system

Cited by 76 publications

References 36 publications

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Study on CO 2 capture from molten carbonate fuel cell hybrid system integrated with oxygen ion transfer membrane

Exergetic performance evaluation of heat pump systems having various heat sources

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