Journal of Fuel Cell Science and Technology最新文献

{"title":"Triple-Layer Control System for Molten Carbonate Fuel Cell–Gas Turbine Hybrid System","authors":"J. Milewski, P. Biczel, M. Kłos","doi":"10.1115/1.4031169","DOIUrl":"https://doi.org/10.1115/1.4031169","url":null,"abstract":"","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"041005"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4031169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63491051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Nonuniform Under-Rib Convection on Reactant and Liquid Water Distribution in Proton Exchange Membrane Fuel Cells","authors":"P. Jithesh, T. Sundararajan, Sarit K. Das","doi":"10.1115/1.4030514","DOIUrl":"https://doi.org/10.1115/1.4030514","url":null,"abstract":"","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"041003"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4030514","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63490381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Rate on Pulsed Laser Deposition of Yttria-Stabilized Zirconia Electrolyte Thin Films for SOFCs","authors":"T. Mukai, T. Fujita, S. Tsukui, KEN-ICHI Yoshida, M. Adachi, K. Goretta","doi":"10.1115/1.4029423","DOIUrl":"https://doi.org/10.1115/1.4029423","url":null,"abstract":"Yttria-stabilized zirconia (YSZ) thin films were deposited by pulsed laser deposition (PLD) at laser repetition frequencies of 10–50 Hz. Controlling the laser repetition frequency can achieve high deposition rate of YSZ, but high deposition rate at high laser repetition frequency can adversely affect the crystallinity of the resulting film. In the present work, X-ray diffraction (XRD) of YSZ thin films deposited at 10–50 Hz unexpectedly indicated no significant differences. Well-crystallized YSZ thin films were obtained for all laser repetition frequencies. This result may be due to a sufficient substrate temperature of 1000 K during processing. The oxide-ion conductivity of each thin film was comparable to that of bulk YSZ. Only minor differences in Y2O3 content, residual stress, grain size, and grain-boundary width were observed among the films. We concluded that similar quality YSZ thin films were obtained at all deposition frequencies. Oxide-ion conductivity was affected by the temperature at which the substrate was deposited. The YSZ thin films deposited at 900 K and 1000 K showed similar oxide-ion conductivity and films deposited at 800 K showed lower oxide-ion conductivity. This difference could perhaps be due to narrow grain-boundary width. The YSZ thin film with highest oxide-ion conductivity was fabricated at an intermediate substrate temperature of 900 K with a deposition rate of 86 nm·min−1 at 50 Hz, without additional high-temperature annealing greater than 1273 K. The YSZ growth rates were faster than the rates for other gas-phase methods such as midfrequency and DC sputtering.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031002"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029423","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63488321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conceptual Design and Performance Analysis of SOFC/Micro Gas Turbine Hybrid Distributed Energy System","authors":"Zheng Dang, Hua Zhao, G. Xi","doi":"10.1115/1.4029395","DOIUrl":"https://doi.org/10.1115/1.4029395","url":null,"abstract":"A numerical model has been developed for the performance analysis of solid oxide fuel cell (SOFC)/micro gas turbine (MGT) hybrid systems with prereforming of natural gas, in which a quasi two-dimensional model has been built up to simulate the cell electrochemical reaction, heat and mass transfer within tubular SOFC. The developed model can be used not only to predict the overall performance of the SOFC/MGT hybrid system but also to reveal the nonuniform temperature distribution within SOFC unit. The effects of turbine inlet temperature (TIT) and pressure ratio (PR) on the performance of the hybrid system have been investigated. The results show that selecting smaller TIT or PR value will lead to relative higher system efficiency and lower CO2 emission ratio; however, this will raise the risk to destroy SOFC beyond the limitation temperature of electrolyte.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031003"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029395","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63488522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the Current Collector on Performance of Anode-Supported Microtubular Solid Oxide Fuel Cells","authors":"M. Casarin, V. Sglavo","doi":"10.1115/1.4029875","DOIUrl":"https://doi.org/10.1115/1.4029875","url":null,"abstract":"Microtubular anode-supported solid oxide fuel cells (lt-SOFC) were created with ametallic coil embedded in the anode to act as current collector. The electrochemical per-formance was experimentally examined by comparing the power density (PD) oflt-SOFC with embedded coils of different turns per unit length and composition (nickeland palladium). It is shown that an increase in the turns per unit length results in a pro-portional current density increase and in a quadratic increment of PD. Additional per-formance improvement is found for the cell with palladium current collector due to thehigher catalytic activity for hydrogen oxidation. [DOI: 10.1115/1.4029875]Keywords: current collector, anode-supported SOFC, microtubular SOFC, electrochemicalperformance","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031005"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029875","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63489231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Independent Analysis of Real-Time, Measured Performance Data From Microcogenerative Fuel Cell Systems Installed in Buildings","authors":"H. Dillon, W. Colella","doi":"10.1115/1.4007162","DOIUrl":"https://doi.org/10.1115/1.4007162","url":null,"abstract":"Pacific Northwest National Laboratory (PNNL) is working with industry to independently monitor up to 15 distinct 5 kW-electric (kWe) combined heat and power (CHP) high temperature (HT) proton exchange membrane (PEM) fuel cell systems (FCSs) installed in light commercial buildings. This research paper discusses an evaluation of the first six months of measured performance data acquired at a 1 s sampling rate from real-time monitoring equipment attached to the FCSs at building sites. Engineering performance parameters are independently evaluated. Based on an analysis of the first few months of measured operating data, FCS performance is consistent with manufacturer-stated performance. Initial data indicate that the FCSs have relatively stable performance and a long-term average production of about 4.57 kWe of power. This value is consistent with, but slightly below, the manufacturer's stated rated electric power output of 5 kWe. The measured system net electric efficiency has averaged 33.7%, based on the higher heating value (HHV) of natural gas fuel. This value, also, is consistent with, but slightly below, the manufacturer's stated rated electric efficiency of 36%. The FCSs provide low-grade hot water to the building at a measured average temperature of about 48.4 °C, lower than the manufacturer's stated maximum hot water delivery temperature of 65 °C. The uptime of the systems is also evaluated. System availability can be defined as the quotient of total operating time compared to time since commissioning. The average values for system availability vary between 96.1 and 97.3%, depending on the FCS evaluated in the field. Performance at rated value for electrical efficiency (PRVeff) can be defined as the quotient of the system time operating at or above the rated electric efficiency and the time since commissioning. The PRVeff varies between 5.6% and 31.6%, depending on the FCS field unit evaluated. Performance at rated value for electrical power (PRVp) can be defined as the quotient of the system time operating at or above the rated electric power and the time since commissioning. PRVp varies between 6.5% and 16.2%. Performance at rated value for electrical efficiency and power (PRVt) can be defined as the quotient of the system time operating at or above both the rated electric efficiency and the electric power output compared to the time since commissioning. PRVt varies between 0.2% and 1.4%. Optimization to determine the manufacturer rating required to achieve PRVt greater than 80% has been performed based on the collected data. For example, for FCS Unit 130 to achieve a PRVt of 95%, it would have to be down-rated to an electrical power output of 3.2 kWe and an electrical efficiency of 29%. The use of PRV as an assessment metric for FCSs has been developed and reported for the first time in this paper. For FCS Unit 130, a maximum decline in electric power output of approximately 18% was observed over a 500 h period in Jan. 2012.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031007"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4007162","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63474703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SOFC Stack Model for Integration Into a Hybrid System: Stack Response to Control Variables","authors":"Michael M. Whiston, M. Bilec, L. Schaefer","doi":"10.1115/1.4029877","DOIUrl":"https://doi.org/10.1115/1.4029877","url":null,"abstract":"Due to the tight coupling of physical processes inside solid oxide fuel cells (SOFCs), efficient control of these devices depends largely on the proper pairing of controlled and manipulated variables. The present study investigates the uncontrolled, dynamic behavior of an SOFC stack that is intended for use in a hybrid SOFC-gas turbine (GT) system. A numerical fuel cell model is developed based on charge, species mass, energy, and momentum balances, and an equivalent circuit is used to combine the fuel cell's irreversibilities. The model is then verified on electrochemical, mass, and thermal timescales. The open-loop response of the average positive electrode-electrolyte-negative electrode (PEN) temperature, fuel utilization, and SOFC power to step changes in the inlet fuel flow rate, current density, and inlet air flow rate is simulated on different timescales. Results indicate that manipulating the current density is the quickest and most efficient way to change the SOFC power. Meanwhile, manipulating the fuel flow is found to be the most efficient way to change the fuel utilization. In future work, it is recommended that such control strategies be further analyzed and compared in the context of a complete SOFC-GT system model.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031006"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029877","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63489456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy System and Thermoeconomic Analysis of Combined Heat and Power High Temperature Proton Exchange Membrane Fuel Cell Systems for Light Commercial Buildings","authors":"W. Colella, S. Pilli","doi":"10.1115/1.4007273","DOIUrl":"https://doi.org/10.1115/1.4007273","url":null,"abstract":"The United States (U.S.) Department of Energy (DOE)’s Pacific Northwest National Laboratory (PNNL) is spearheading a program with industry to deploy and independently monitor five kilowatt-electric (kWe) combined heat and power (CHP) fuel cell systems (FCSs) in light commercial buildings. This publication discusses results from PNNL’s research efforts to independently evaluate manufacturer-stated engineering, economic, and environmental performance of these CHP FCSs at installation sites. The analysis was done by developing parameters for economic comparison of CHP installations. Key thermodynamic terms are first defined, followed by an economic analysis using both a standard accounting approach and a management accounting approach. Key economic and environmental performance parameters are evaluated, including (1) the average per unit cost of the CHP FCSs per unit of power, (2) the average per unit cost of the CHP FCSs per unit of energy, (3) the change in greenhouse gas (GHG) and air pollution emissions with a switch from conventional power plants and furnaces to CHP FCSs; (4) the change in GHG mitigation costs from the switch; and (5) the change in human health costs related to air pollution. From the power perspective, the average per unit cost per unit of electrical power is estimated to span amore » range from $15–19,000/ kilowatt-electric (kWe) (depending on site-specific changes in installation, fuel, and other costs), while the average per unit cost of electrical and heat recovery power varies between $7,000 and $9,000/kW. From the energy perspective, the average per unit cost per unit of electrical energy ranges from $0.38 to $0.46/kilowatt-hour-electric (kWhe), while the average per unit cost per unit of electrical and heat recovery energy varies from $0.18 to $0.23/kWh. These values are calculated from engineering and economic performance data provided by the manufacturer (not independently measured data). The GHG emissions were estimated to decrease by one-third by shifting from a conventional energy system to a CHP FCS system. The GHG mitigation costs were also proportional to the changes in the GHG gas emissions. Human health costs were estimated to decrease significantly with a switch from a conventional system to a CHP FCS system.« less","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031008"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4007273","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63474510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fault Diagnosis of Solid Oxide Fuel Cell Based on a Supervised Self-Organization Map Model","authors":"Xiao Juan Wu, Hongtan Liu","doi":"10.1115/1.4029070","DOIUrl":"https://doi.org/10.1115/1.4029070","url":null,"abstract":"Too high stack temperature and insufficient reactant gas flow may lead to severe and irreversible damages in a real solid oxide fuel cell (SOFC) power system. Thus, fault monitoring and diagnosis technology is indispensable to improve the SOFC system reliability. A supervised self-organization map (SOM) model is proposed to diagnose the faults of the SOFC system in this paper. Using the supervised SOM model, the multidimensional testing data of the SOFC is mapped into a two-dimensional map, and the different region in the out map is represented for one fault mode. The method is evaluated using the data obtained from an SOFC mathematical model, and the results show that the supervised SOM analysis contributes on a very efficient way to the faults diagnosis of the SOFC system.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031001"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63487747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermomechanical Properties of Cycled Ceramic/Glass Composite Seals for Solid Oxide Fuel Cells","authors":"B. Dev, M. Walter","doi":"10.1115/1.4029876","DOIUrl":"https://doi.org/10.1115/1.4029876","url":null,"abstract":"The present research focuses on a novel ceramic/glass composite seal. These seals firstunderwent a curing cycle. The cycled seal was then characterized with a laser dilatome-ter to identify the glass transition, softening temperature, and thermal expansion proper-ties. High temperature ring-on-ring (RoR) experiments were performed to study the effectof glass transition and softening temperatures on mechanical response. X-ray diffraction(XRD) techniques in conjunction with post-test micrographs were used to understand theobserved mechanical response. In addition, Weibull statistical analysis performed oncycled seals showed that Weibull modulus had decreased and Weibull characteristicsstrength had increased with multiple thermal cycles. [DOI: 10.1115/1.4029876]Keywords: solid oxide fuel cell (SOFC), ceramic/glass seals, glass transition tempera-ture, biaxial flexural strength, Weibull parameters","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"12 1","pages":"031009"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4029876","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63489440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}