... power generation. Great expectations have been placed on both simple and hybrid fuel cell plants, thus making necessary the evolution of analysis strategies to evaluate thermodynamic performance, design improvements, and acceleration of new developments. This paper investigates the thermodynamic...

... transfer in the enclosure. The impact of these measures on internal temperature distributions within the cell-stack is also presented. A comparison with the results from traditional adiabatic, zero-dimensional thermodynamic system modeling reveals that oxidant flow requirements can be overpredicted...

... that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids. 15 11 2007 07 12 2007 27 02 2009 fuel cell power plants fuel cells hybrid power systems thermodynamics In literature and in handbooks are plotted various performances of fuel cells...

...M. Williams; T. Horita; K. Yamagi; N. Sakai; H. Yokokawa There are at least four basic fuel cell thermodynamic features: maximum intrinsic thermal efficiency (electrical efficiency), reversible potential, and two new ones—intrinsic cooling requirement and intrinsic exergetic efficiency. A basic...

...% the electricity production. Pinch analysis is then applied in order to analyze the theoretical improvements and to rearrange the location of the heat recovery devices, without modifying the temperature conditions of the main processes. The optimal structure, according to a thermodynamic criterion, is obtained...

... systems) where the fuel cell works together with other thermodynamic cycles to produce, with a high fuel-to-electricity efficiency, electricity alone. A large number of cogeneration arrangements are mentioned. Some are described in detail. A brief analysis of benefits and drawbacks of such systems...

... process has been the most investigated process. The objective of this study is to show a thermodynamic analysis of steam reforming of ethanol, to determine the best thermodynamic conditions where the highest volumes of products are produced, making possible a higher production of energy, that is, a more...

...S. Campanari; P. Iora; P. Silva; E. Macchi This paper investigates the thermodynamic potential of the integration of molten carbon fuel cell (MCFC) technology with gas turbine systems for small-scale (sub-megawatt or sub-MW) as well as large-scale (multi-MW) hybrid cycles. Following the proposals...

... is carbon formation within the ceramic layers at intermediate temperatures. This paper proposes a model solution using the CFD-ACE software package to simulate the behavior of a tubular SOFC. A detailed thermodynamic analysis is carried out to predict the boundary of carbon formation for SOFCs fueled...

...Alessandra Perna The purpose of this work is to investigate, by a thermodynamic analysis, the effects of the process variables on the performance of an autothermal reforming (ATR)-based fuel processor, operating on ethanol as fuel, integrated into an overall proton exchange membrane (PEM) fuel cell...

... into account the strong point-to-point anode and cathode reaction coupling due to gas crossflow. Simulations (carried out after suitable thermodynamical and electrochemical parameter tuning) highlight, for instance, the presence of dynamics, linked to the electrochemical behavior, with time constants...

... ° C . The kinetics of the processes was studied and thermodynamic parameters such as activation energy were also calculated and correlated to the compositions and microstructure of the materials. The study clears up the effect of anode composition and microstructure on the reduction, reoxidation...

...N. Woudstra; T. P. van der Stelt; K. Hemmes Energy conversion today is subject to high thermodynamic losses. About 50% to 90% of the exergy of primary fuels is lost during conversion into power or heat. The fast increasing world energy demand makes a further increase of conversion efficiencies...

...Wolfgang Winkler The increasing demand on primary energy and the increasing concern on climatic change demand immediately a sustainable development, but still there remain open questions regarding its technical realization. The second law of thermodynamics is a very simple but efficient way...