Determination of Temperature and Fuel Utilization Distributions in SOFC Stacks with EIS

2017 ◽  
Vol 78 (1) ◽  
pp. 2141-2150 ◽  
Author(s):  
Johan Tallgren ◽  
Carlos Boigues Muñoz ◽  
Jyrki Mikkola ◽  
Olli Himanen ◽  
Jari Kiviaho
Keyword(s):  
Fuel Utilization ◽  
Utilization Distributions ◽  
Sofc Stacks

Determination of Global/local Fuel Utilization via Variation of Fuel Utilization

2019 ◽  
Vol 25 (2) ◽  
pp. 811-814 ◽  
Author(s):  
Andreas Reinert ◽  
Thomas Strohbach
Keyword(s):  
Fuel Utilization

scholarly journals Autothermal Reforming of Diesel Oil for PdCeCrFeCu/Al2O3-Catalyzed Hydrogen Production

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lin Lin ◽  
Kai Zhang ◽  
Chiyu Sun ◽  
Ying Zhang
Keyword(s):  
Electrochemical Behaviour ◽  
Diesel Oil ◽  
Operating Parameters ◽  
Fuel Utilization ◽  
Steady State Mode ◽  
Two Stage ◽  
Design Variables ◽  
Density Values ◽  
Chp System ◽  
Sofc Stacks

Abstract Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fixed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.

scholarly journals Numerical analysis of a serial connection of two staged SOFC stacks in a CHP system fed by methane using Aspen TECH

2019 ◽  
Vol 21 (1) ◽  
pp. 33-43
Author(s):  
Paulina Pianko-Oprych ◽  
Mateusz Palus
Keyword(s):  
Electrical Performance ◽  
Fuel Utilization ◽  
Optimal Control Strategy ◽  
Two Stage ◽  
Performance Simulation ◽  
Serial Connection ◽  
Funded Project ◽  
Chp System ◽  
Sofc Stacks ◽  
Good Agreement

Abstract The objective of the study was to develop a steady-state system model in Aspen TECH using user-defined subroutines to predict the SOFC electrochemical performance. In order to achieve high overall fuel utilization and thus high electrical efficiency, a concept of Combined Heat and Power system with two-stage SOFC stacks of different number of cells was analyzed. The concept of two-stage SOFC stacks based system was developed in the framework of the FP7 EU-funded project STAGE-SOFC. The model was validated against data gathered during the operation of the proof-of-concept showing good agreement with the comparative simulation data. Following model validation, further simulations were performed for different values of fuel utilization to analyze its influence on system electrical performance. Simulation results showed that the concept of two-stage SOFC stacks configuration was viable and reliable. The model can be useful for development the optimal control strategy for system under safe conditions.

scholarly journals A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mateusz Palus ◽  
Paulina Pianko-Oprych
Keyword(s):  
Electrochemical Behaviour ◽  
Combined Heat And Power ◽  
Operating Parameters ◽  
Fuel Utilization ◽  
Steady State Mode ◽  
Two Stage ◽  
Design Variables ◽  
Density Values ◽  
Chp System ◽  
Sofc Stacks

Abstract Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fixed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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