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Research paper : Evaluating Uncertainty for the Standardization of Single Cell/Stack Power Generation Performance Tests for SOFC (A. Momma et al.)−260−Synthesiology - English edition Vol.5 No.4 (2013) seems to be a common saying among the specialists in the field that “the biggest uncertainty lies in those factors that have not been considered.” In our evaluation of uncertainty for the draft standard, the following may fall under that category: (1) Change in performance due to temperature distribution (as suggested above);(2) Operator-to-operator variability;(3) Sample variability;(4) Drift due to time-dependent change.It follows therefore that we have not been able to escape the curse of the above-mentioned proverb, either. Some of these factors were intentionally omitted based on our guiding principles on uncertainty evaluation. The concept of drift due to time-dependent degradation is crucial when discussing the durability of SOFC, and we are currently in the midst of discussions regarding the testing methods for the durability of SOFC.[11]Thus, we have discussed the approach we have selected for international standardization that is a must for a new technology to become globally commercialized and accepted. We would consider it a work well done if it can in any way serve as a guide for our colleagues involved in the development of technology, and at the same time invite you to submit any feedback or criticisms of uncertainty evaluation. AcknowledgementThis study was made possible by the Research and Development Project on Standardization and Certification and the Joint Research and Development Project on International Standardization funded by METI. We would like to thank the members of the Committee for the Research and Development of the Standardization of SOFC Unit Cell Assembly Testing Methods as well as all other firms and organizations involved for their cooperation in the preparation of the draft standard. References[1]http://fctesqa.jrc.ec.europa.eu/[2]JIS TS C 0054, Testing method of power generation efficiency for solid oxide fuel cell power systems fueled with gas in which methane is main component(2010) (in Japanese).[3]T. Kato et al.: View and Development of Solid Oxide Fuel Cells, ed. by K. Eguchi, CMC Books, 179-190 (2010) (in Japanese). [4]New Energy and Industrial Technology Development (NEDO): “Research on the Technology for the Evaluation of System Efficiency Measurement,” System Performance Evaluation Technology Development, SOFC Fuel Cell System Performance Technology Evaluation Technology, SOFC Fuel Cell System Technology Development, NEDO Activity Report 2007, (2008) (in Japanese). [5]Y. Tanaka, A. Momma, A. Negishi, K. Kato, K. Takano, K. Nozaki and T. Kato: Progress towards realizing distributed power generation with highly efficient SOFC systems, Synthesiology, 6(1), 12-23 (2013) (in Japanese). [6]Y. Tanaka, A. Momma, K. Kato, A. Negishi, K. Takano, K. Nozaki and T. Kato: Development of electrical efficiency measurement techniques for 10 kW-class SOFC system: Part II. Uncertainty estimation, Energy Conversion and Management, 50 (3), 467-478 (2009).[7]ISO/IEC Guide. Guide to the Expression of Uncertainty in Measurement (GUM), International Organization for Standardization, 98 (1995).[8]IEC 62282-3-200 Ed.1 (CDV). Fuel cell technologies - Part 3-200: Stationary fuel cell power systems - Performance test methods.[9]ASME PTC 50-2002. Fuel Cell Power Systems Performance - Performance Test Codes.[10]IEC/TS 62282-7-1. Fuel cell technologies - Part 7-1: Single cell test methods for polymer electrolyte fuel cell (PEFC).[11]NEDO: “Standardization of SOFC Single Cell/Stack Durability Testing Method,” Project for Strategic Promotion of International Standardization/Leading Research on Standardization, NEDO Activity Report 2010 (2011) (in Japanese). AuthorsAkihiko MommaCompleted the doctoral program of the Metallurgical Engineering Department at Tokyo Institute of Technology in 1985. Worked at SRI International as a guest researcher and subsequently joined the Electrotechnical Laboratory Japan (the predecessor of the National Institute of Advanced Industrial Science and Technology (AIST)), where he engaged in the research and development of SOFC. Currently senior research scientist of the Fuel Cell System Group of AIST’s Energy Technology Research Institute and specializes in electrochemical measurements and evaluations. In preparing for this paper, he was responsible for managing the committee work, conducting various electrochemical measurements, evaluating the uncertainty equation, and writing and editing. Kiyonami TakanoGraduated from the Department of Electrical and Electronic Engineering of the Faculty of Engineering of the University of Tokushima in 1966. Joined the Electrotechnical Laboratory of the Agency of Industrial Science and Technology of the Ministry of International Trade and Industry (the predecessor of METI). After engaging in the research of the simulation technology of lithium secondary battery from 1991, began working on the research for the power generation evaluation of SOFC in 2001. Currently guest researcher at the Fuel Cell System Group of the Energy Technology Research Institute. In this study, he was in charge of conducting pressure dependence tests for single cells, temperature distribution measurements, and uncertainty evaluation.

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