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수소가스 유량 변화에 따른 센서 칩에서의 센싱감도 및 열특성 연구
서호철(Ho-Cheol Suh),조용준(Yong-Jun Cho),박경석(Kyoung-Suk Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Even though hydrogen is an environment-friendly energy source, safety and effectiveness issues in storage, transportation, and usage of hydrogen should be clearly resolved in every application. Thus, sensors for detecting hydrogen leakage, especially for automotive hydrogen fuel cell systems, should be designed to have much higher resolution and accuracy in comparison with conventional gas sensors. In the present study, the performance of a combustion type micro chip hydrogen sensor for fuel cell electric vehicle is optimized by investigating the effect of flow rate of hydrogen on the resolution of the micro chip hydrogen sensor is investigated.. Prototypic sensors with detection element and compensation element were fabricated to have five different resistances (40Ω, 60Ω, 80Ω, 100Ω, 120Ω) of heaters. At the given hydrogen flow rates 3.3 ~ 16.5 cm3/s, the effect of the hydrogen flow rate on the temperature change of detection and compensation elements, and the sensitivity of the sensor is insignificant.
연료전지 개질기용 증발기의 작동유체 흐름 방향에 따른 열특성에 관한 연구
서호철(Ho-Cheol Suh),노형철(Hyung-Chul Noh),박경석(Kyoung-Suk Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Steam reformer was organized with steam reforming process and CO removing process. The steam reforming process needed high temperature, 600~900℃, for catalytic-reaction which was extract of hydrogen from steam and hydrocarbon. In this paper, miniaturization and performance improvement for the operation of the evaporator according to the direction of fluid flow to investigate the thermal characteristic. The thermal characteristic was investigated mass flow rate, specific heat, and temperature difference of working fluid. In addition, the fuel cell reformer was to secure the reliability attached to the actual reformer and operated.
한대광(Dae-Kwang Han),서호철(Ho-Cheol Suh),이정재(Jurng-Jae Yee),강정호(Jung-Ho Kang),한승호(Seung-Ho Han) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
An oxygen sensor installed in vehicle exhaust systems enables to measure the amount of oxygen in the exhaust gas, in which the measured data are collected and analyzed in ECU(Engine Control Unit). The oxygen sensor is exposed to the high speed exhaust gas at high temperature circumstance, so that protection caps are required not only to protect the susceptible measuring part, but also to provide the real time measurement without time delay. In this study, a new oxygen sensor with one protection cap was proposed, and the CFD analysis was carried out in order to compare the performance characteristics, such as flow speed and ratio of AOA(Age of Air), for the conventional and new oxygen sensor. The numerical results of CFD analysis provided the flow speed of 1.34m/s and the ratio of AOA of 3.43. The similar features obtained from the numerical results showed that the new oxygen sensor guarantees the same performance characteristics of the conventional ones.