• Title/Summary/Keyword: cell sizing

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A NEW CELL SIZING METHOD FOR AUTOMATIC UNSTRUCTURED GRID GENERATION USING CAD SURFACE DATA (CAD 형상 데이터를 이용한 비정렬 격자 자동 생성을 위한 격자셀 크기 지정 기법)

  • Lee, B.J.;Kim, B.S.
    • 한국전산유체공학회:학술대회논문집
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    • 2007.10a
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    • pp.120-125
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    • 2007
  • In this paper a new cell sizing method is proposed. The new method calculates cell size at a point using given size control elements directly without the aid of background grid as other cell sizing algorithms do. The calculation method and related definitions are described in detail, and typical cell sizing results are given.

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Microfluidic cell sizing using hydrophoretic size-based separation (유체영동 기반의 입자분리현상을 이용한 세포 크기 측정방법)

  • Choi, Sung-Young;Park, Je-Kyun
    • Journal of Sensor Science and Technology
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    • v.17 no.4
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    • pp.245-249
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    • 2008
  • This paper presents a microfluidic cell sizing method using hydrophoretic size-based separation. By exploiting slanted obstacles in a microchannel, we can generate a lateral pressure gradient so that microparticles can be deflected and arranged along lateral flows induced by the gradient. Using such movement of particles, we discriminated 8 to 15 μm-sized beads. We measured the size of U937 cells by comparing the hydrophoretic response of the cells to those of the size-standard beads whose diameters are known. Due to its simple design and fabrication, the sizing method can be easily integrated with other microfluidic components such as cell culture chambers conducting on-chip sizing and sorting.

Sizing of Powertrain in Fuel Cell Hybrid Vehicles (연료전지 하이브리드 자동차의 동력전달계의 용량 선정)

  • Zheng, Chun-Hua;Shin, Chang-Woo;Park, Yeong-Il;Cha, Suk-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.113-118
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    • 2011
  • Fuel Cell Hybrid Vehicle (FCHV) is one of the most promising candidates for the next generation of transportation. It has many outstanding advantages such as higher energy efficiency and much lower emissions than internal combustion engine vehicles. It also has the ability of recovering braking energy. In order to design an FCHV drive train, we need to determine the size of the electric motor, the Fuel Cell System (FCS), and the battery. In this paper, the methodology for the sizing of these components is introduced based on the driveability constraints of the FCHV. A power management strategy is also presented because the battery energy capacity depends on it. The warm-up time of the FCS is also considered in the power management strategy and the simulation result is compared to that without considering the warm-up time.

Aircraft Sizing Methods for the Design of an Electrically Propelled Aircraft (전기추진 항공기 설계를 위한 사이징 방법 연구)

  • Hwang, Ho-Yon;Nam, Tae-Woo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.7
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    • pp.590-600
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    • 2012
  • In this research, generalized sizing methods were studied that can be applied to an aircraft which uses solar cell or fuel cell as energy sources. To consider multiple propulsion systems and energy resources, multiple power paths were modeled and the weight of consumable and non-consumable energy was reflected in the weight change calculation for each mission segments. In the constraint analysis, power to weight ratio was selected instead of thrust to weight ratio and used in the sizing process of balancing power and energy.

Study on Sizing Calculation Method of Fuel Cell Propulsion Multirotor (연료전지 추진 멀티콥터의 사이징 계산 방법에 관한 연구)

  • LEE, DONGKEUN;AHN, KOOKYOUNG;KIM, YOUNGSANG
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.542-550
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    • 2021
  • As the application of multirotor grows, the demands for multirotor that can fly longer and load more are increasing. Hydrogen has a high energy density, so it can satisfy these demands when used in multirotor. In order to design hydrogen fueled multirotor that satisfies the desired flight time and payload, it is important to calculate the specifications of a fuel cell, battery, and hydrogen storage system. This paper contains detailed information on various energy systems used in multirotor and fuel cell powered multirotor research trends. This study proposed a sizing calculation method that meets the target flight time and payload using thrust and power equations. It has been explained how the two equations derive the particular specifications. The specifications of the multirotor were derived by assuming a payload of 50 kg and a flight time of 1 hour. In addition, the effects of the values of the fuel cell, hydrogen storage system, and motor propeller were analyzed.

Initial Sizing of General Aviation Aircraft Propelled by Electric Propulsion system (전기로 추진되는 일반 프로펠러 항공기의 초기 사이징)

  • Han, Hye-Sun;Shin, Kyo-Sic;Park, Hong-Ju;Hwang, Ho-Yon;Nam, Taewoo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.5
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    • pp.391-403
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    • 2013
  • Propeller aircraft propelled by an electric propulsion system is gaining a renewed interest because of ever-increasing environmental concern on harmful emissions emitted from conventional jet engines and national energy security. Traditional aircraft sizing methods are not readily applicable to electric propulsion aircraft that utilize a variety of alternative energy sources and power generation systems. This study showcases an electric propulsion aircraft sizing exercise based on a generalized, power based sizing method. A general aviation aircraft is propelled by an electric propulsion system that comprises of a propeller, a high temperature super conducting motor, a Proton Exchange Membrance(PEM) fuel cell system fuelled with hydrogen, and power conditioning equipment. In order to assess the impact of technology progression, aircraft sizing was conducted for two different sets of technology assumptions for electric components, and the results were compared with conventional baseline aircraft.

Electrical Characteristics for Different Width of Dye-sensitized Solar Cell with Pt Electrode Deposited by Sputtering Methode (스퍼터링 증착한 Pt 전극을 가지는 염료감응형 태양전지의 셀 폭 변화에 따른 전기적 특성 연구)

  • Song, Keun-Ju;Choi, Jin-Young;Hong, Ji-Tae;Kim, Mi-Jeoung;Se, Hyun-Woong;Lee, Dong-Yoon;Kim, Hee-Je
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.5
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    • pp.910-914
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    • 2007
  • Recently, a study on the energy conversion efficiency and up sizing' technology of dye-sensitized solar cell (DSC) which is focused in considering a new alternative solar cell has been executed. But consideration for the cell characteristics about an internal electronic flow on a large-scaled DSC has not been carried out yet. In this study, we have chosen a solar cell width as a variable of a large-scaled DSCs and confirmed electric characteristics of an individual cell. First, Pt counter electrode surface of DSC is deposited by RF sputtering methode and the electrochemical properties of Pt electrodes was investigated by cyclic -voltammetry. With the Pt electrode, we fabricated DSC samples of different width. As a result, the higher the internal resistance of DSC becomes, the wider the width gets. Internal resistance makes it difficult to collect photoelectron generated from dye. Ultimately up sizing DSC causes the increase of internal resistance and then has a bad effect on the cell characteristics.

A Study of Modeling PEM Fuel Cell System Using Multi-Variable Optimization Technique for Automotive Applications (다변수 최적화 기법을 이용한 자동차용 고분자 전해질형 연료전지 시스템 모델링에 관한 연구)

  • Kim, Han-Sang;Min, Kyoung-Doug;Jeon, Soon-Il;Kim, Soo-Whan;Lim, Tae-Won;Park, Jin-Ho
    • New & Renewable Energy
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    • v.1 no.4 s.4
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    • pp.43-48
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    • 2005
  • This study presents the integrated modeling approach to simulate the proton exchange membrane [PEM] fuel cell system for vehicle application. The fuel cell system consisting of stack and balance of plant (BOP) was simulated with MATLAB/Simulink environment to estimate the maximum system power and investigate the effect of BOP component sizing on system performance and efficiency. The PEM fuel cell stack model was established by using a semi-empirical modeling. To maximize the net efficiency of fuel cell system, multi-variable optimization code was adopted. Using this method, the optimized operating values were obtained according to various system net power levels. The fuel cell model established was co-linked to AVL CRUISE, a vehicle simulation package. Through the vehicle simulation software, the fuel economy of fuel cell powered electric vehicle for two types of driving cycles was presented and compared. It is expected that this study can be effectively employed in the basic BOP component sizing and in establishing system operation map with respect to net power level of fuel cell system.

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A Study of Modeling PEM Fuel Cell System Using Multi-Variable Optimization Technique for Automotive Applications (다변수 최적화 기법을 이용한 자동차용 고분자전해질형 연료전지 시스템 모델링에 관한 연구)

  • Kim, Han-Sang;Min, Kyoung-Doug;Jeon, Soon-Il;Kim, Soo-Whan;Lim, Tae-Won;Park, Jin-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.11a
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    • pp.541-544
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    • 2005
  • This study presents the integrated modeling approach to simulate the proton exchange membrane (PEM) fuel cell system for vehicle application. The fuel cell system consisting of stack and balance of plant (BOP) was simulated with MATLAB/Simulink environment to estimate the maximum system power and investigate the effect of BOP component sizing on system performance and efficiency. The PEM fuel cell stack model was established by using a semi-empirical modeling. To maximize the net efficiency of fuel cel1 system, multi-variable optimization code was adopted. Using this method the optimized operating values were obtained according to various system net power levels. The fuel cell model established was co-linked to AVL CRUISE, a vehicle simulation package. Through the vehicle simulation software, the fuel economy of fuel cell powered electric vehicle for two types of driving cycles was presented and compared. It is expected that this study tan be effectively employed in the basic BOP component sizing and in establishing system operation map with respect to net power level of fuel cell system.

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Effects of Key Operating Parameters on the Efficiency of Two Types of PEM Fuel Cell Systems (High-Pressure and Low-Pressure Operating) for Automotive Applications

  • Kim Han-Sang;Lee Dong-Hun;Min Kyoungdoug;Kim Minsoo
    • Journal of Mechanical Science and Technology
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    • v.19 no.4
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    • pp.1018-1026
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    • 2005
  • The proton exchange membrane (PEM) fuel cell system consisting of stack and balance of plant (BOP) was modeled in a MATLAB/Simulink environment. High-pressure operating (compressor type) and low-pressure operating (air blower type) fuel cell systems were con­sidered. The effects of two main operating parameters (humidity and the pressure of the supplied gas) on the power distribution characteristics of BOP and the net system efficiency of the two systems mentioned above were compared and discussed. The simulation determines an optimum condition regarding parameters such as the cathode air pressure and the relative humidity for maximum net system efficiency for the operating fuel cell systems. This study contributes to get a basic insight into the fuel cell stack and BOP component sizing. Further research using muli­object variable optimization packages and the approach developed by this study can effectively contribute to an operating strategy for the practical use of fuel cell systems for vehicles.