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해외 정보 - 신규 원전이 채택하고 있는 휴먼 시스템 인터페이스(HSIs) 기술
Hugo, Jacques,Gertman, David 한국원자력산업회의 2016 원자력산업 Vol.36 No.2
최첨단 휴먼 시스템 인터페이스(Human System Interfaces, HSIs) 기술을 연구 분석하여 설계를 거쳐 채택하는 것이 원전 공학 기술의 중요한 요소 중 하나로 자리를 잡고 있다. 미국 아이다호 국립 에너지안보연구소의 Jacques Hugo와 David Gertman은 기술의 사용 환경, 기술 성숙도, 유용성, 인적 성과가 필요한 직무를 기반으로 한 이 새로운 기술이 원전업계가 선택해야 할 바람직한 방안이라고 제안하고 있다.
( Hugo Ajrouche ),( Ob Nilaphai ),( Bruno Moreau ),( Camille Hespel ),( Fabrice Foucher ),( Christine Mounaim-rousselle ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
New One Shot Engine (NOSE) has been designed to simulate the thermodynamic conditions at High Pressure-High Temperature like an actual common-rail diesel engine to study the diesel spray and combustion. The advantage of this kind of set-up in comparison to pre-bum chamber or flue chamber is that the initial gas mixture can be well controlled in terms of species and mole fraction. Indeed, as example, the combustion of spray in more realistic environment can be done by adding species which represent burnt gas recirculation (EGR) or in an environment without H<sub>2</sub>O and CO<sub>2</sub>. Therefore, our first objective was to share the experimental results required by Engine Combustion Network (https://ecn.sandia.gov) which represents the international reference in the establishment of high-quality and quantitative data sets for engine spray combustion to develop and improve models. The purpose of this work is to present experimental results from different classical data already available by ECN and to discuss about the limitations of NOSE. For that, first the non-reactive standard Spray-A condition (900 K, 60 bar, and 22.8 kg/m3 with pure Nitrogen) was reached to evaluate the accuracy of the set-up in terms of liquid and vapor penetration lengths, respectively characterized by Schlieren and Diffused-Back Illumination. Then the NOSE set-up was improved to provide conditions for different ambient temperatures as 800 K and 850 K. Second, in reactive conditions, the Lift-Off Length (LOL) was measured by OH<sup>*</sup> chemiluminescence images. Different techniques as the Schlieren, OH<sup>*</sup> chemiluminescence and cylinder pressure rise were used to measure Ignition Delay (ID) and compared. The consistency of the data obtained from liquid length and spray penetration indicates a good level of repeatability between the test rigs employed. The results outline a global agreement with the ECN dataset. Mainly the differences are observed for ID and LOL, due to variations and inhomogeneities of the temperature field, especially in the case of 800 K. To provide a temperature field more homogeneous, different compression ratios have been tested and the chamber temperature characterized by using 4 fine wire thermocouples of 25 ㎛ diameter. Results show that homogeneous temperature inside chamber lead to higher ignition delay than inhomogeneous conditions. The future work will be focused on the presence of different species to evaluate their impact on the combustion development and soot production/oxidation.
Reliability: A Neglected Topic in the Power Electronics Curricula
Hugo Calleja,Freddy Chan 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.6
This paper presents the approach followed to develop a course that introduces reliability into the design of power electronics converters. The course is part of the curriculum of a master of science in electrical engineering program, and it is aimed at providing reliability tools that can be used in a straightforward manner, while avoiding the mathematical intricacies. The reliability calculations are performed according to the Military Handbook 217, using the evaluation version of a commercial software package which greatly reduces the computational burden usually associated with this task. The course assessment shows that, after attending the course, students were able to improve the mean time between failures in a power-electronics converter, from a minimum of 5%, up to 100%.
HUGO VALENÇA DE ARAÚJO,JOSÉ VICENTE HALLAK D'ANGELO 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.4
Alcoholic fermentation is one of the most important stages in industrial ethanol productionprocess, involving a biochemical and exothermic reaction. Sometimes cooling towers are notcapable of supplying a cold utility with a temperature low enough to maintain the fermentativemedium temperature in a desirable range. Absorption Refrigeration Systems (ARS) appears to bea good alternative to obtain the necessary refrigeration for the fermentation process. The aim ofthe present paper was to carry out a thermodynamic analysis of ARS, evaluating their performancethrough the First and Second Laws of Thermodynamics. ARS with different con¯gurationswere studied (single-effect and double-effect with series, parallel and reverse parallel flows), all ofthem operating with water/lithium bromide mixture as working pair, under different operatingconditions in order to satisfy the cooling load required by an industrial alcoholic fermentationprocess. Another objective of this paper was to investigate the risk of LiBr crystallization, whichcan result in scaling formation, with the aid of the solid–liquid phase equilibrium curve of H2O/LiBr mixture. Among the double-effect con¯gurations studied, it was observed that series flow presents the more signi¯cant crystallization risk, which represents a limit to improve its First andSecond Law performances. It was veri¯ed that the Second Law performance for the single-anddouble-effect ARS analyzed are similar, but their First Law performance are considerably different. This is due to the amount and quality of the heat consumed in the first effect generators ofthese systems. For a base case studied, First Law performance measured by coefficient of performance(COP) of double-effect ARS is 72% greater than the one for single-effect, while forSecond Law performance, measured by exergetic efficiency, an increase of 5% was observed.