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고분자 전해질 연료전지의 매니폴드 및 분리판 유동분배 특성 분석
조중원(Cho, Chung-Won),유상필(Yoo, Sang-Phil),김민진(Kim, Min-Jin),이원용(Lee, Won-Yong),김창수(Kim, Chang-Su) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
A numerical study is made of a manifold and bipolar plate in polymer electrolyte fuel cells, the aim of the present study is to describe the characteristics of flow pattern In manifold and bipolar plate. The present work shows that the flow pattern in the bipolar plate is affected by the penetration flow through GDL characterized by clamping pressure and GDL intrusion in to a channel area. Manifold geometry also affects the flow distribution. The recirculation flow by bent duct destroy even distribution In manifold, the present work shows that corner rounding can improve the manifold performance.
조중원,김상준,안기장,정명균,Cho, Choong-Won,Kim, Sang-Joon,Ahn, Gi-Jang,Chung, Myung-Kyoon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
In the gas wiping process of continuous hot-dip galvanizing, edge overcoating develops near the edge of the steel strip. The overcoating is supposed to occur due to the reduced impact pressure of wiping gas on the strip surface. The purpose of this study is to investigate the effect of edge vortex on the reduced impact pressure. Three-dimensional unsteady flows are simulated using a commercial code, STAR-CD. Standard k-$\varepsilon$ model is used as a turbulence model. It is found that an alternating vortex structure in the vicinity of strip edge is developed by buckling of opposed jet streams and that the reduced amount of impact pressure at strip edge becomes smaller as the air knife gets closer to the strip. The effect of edge baffle on the reduced impact pressure is also investigated.
무공해 승용 자동차의 냉방을 위한 전동식 냉방시스템 성능에 관한 연구
이무연(Lee, Moo-Yeon),조중원(Cho, Chung-Won),이호성(Lee, Ho-Seong),원종필(Won, Jong-Phil) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12
본 연구의 목적은 친환경 무공해 승용 차량에 적용되는 전동식 냉방시스템의 성능특성을 실차에서 확인하는 것이다. 이를 위하여 인버터로 구동되는 전동식 스크롤 압축기를 적용한 전동식 냉방시스템을 설계 및 제작하여 수소 연료전지 자동차에 설치하여 다양한 주행도로 조건에서 실험을 진행하였다. 주행조건의 변화는 시험차량에 장착된 전 동식 냉방시스템의 성능에 영향을 주었으며, 고속 및 일반도로 주행조건에서 냉방시스템의 성능이 정지조건에서 냉방 시스템의 성능보다 우수하게 나타났다. 또한, 외기온도가 20.0oC에서 30.0oC로 증가함에 따라 고내 온도는 평균 5.2oC 더 적게 감소하였다. The objective of this study is to investigate the cooling performances of the electrical air-conditioning system using electric driven scroll compressor for zero emission passenger vehicles. This air conditioner with air source was used R-134a as a refrigerant and installed in a real zero emission passenger vehicle for tests under various driving conditions. The cooling performance of the electrical air conditioner was affected by driving velocities and conditions of the tested vehicle. The condensing rate of the condenser during driving is better than that of the idle condition. The average cool down temperature in the cabin room decreased on average 5.2oC with the increase of the outdoor temperature from 20.0oC to 30.0oC. In addition, the cooling performances were sufficient for cooling loads of the tested passenger car under tested conditions.
이산화탄소를 적용한 승용자동차 냉방시스템의 성능특성에 관한 연구
이호성(Lee, Ho-Seong),조중원(Cho, Chung-Won),원종필(Won, Jong-Phil),이무연(Lee, Moo-Yeon) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12
본 연구의 목적은 이산화탄소를 적용한 자동차용 냉방시스템의 냉방 성능특성을 고찰하는 것이다. 특히 자 동차의 실도로 운전 조건을 모사할 수 있도록 실험 조건을 선정하였으며 실제 자동차에 적용된 이산화탄소용 냉방시 스템에 대하여 다양한 냉방성능 실험을 진행하였다. 결과적으로, 가스쿨러 입구 공기온도가 증가할수록 냉방용량과 COP는 감소하였고 증발기 입구 공기온도가 증가할수록 냉방용량과 COP는 증가하였다. 또한, 압축기 회전속도가 900 rev/min에서 1800 rev/min으로 증가할수록 냉방용량은 42.2% 증가였으나 냉방 COP는 55.4% 감소하였다. The objective of this study is to investigate cooling performance characteristics of mobile air conditioning system using R744 as an alternative of R-134a. In order to analyze the cooling performance characteristics of the air conditioning system using R744 for a passenger vehicle, the developed air conditioning system using R744 was applied in a real passenger vehicle and tested under various operating conditions with the variation of gas-cooler inlet air conditions, evaporator inlet air temperatures and compressor speeds. As a result, cooling capacity and coefficient of performance (COP) of the tested air conditioning system decreased with the rise of the inlet air temperature of the gas cooler but increased with the rise of the inlet air temperature of the evaporator. In addition, cooling capacity and coefficient of performance (COP) increased by 42.2 % with the rise of the compressor speed from 900 rev/min to 1800 rev/min, but it decreased by 55.4%.
자동차용 공기청정기의 구조변화에 따른 내부유동의 변화에 대한 전산해석을 통한 연구
임택규(Taek-Kyu Lim),조중원(Chung-Won Cho),원종필(Jong-Phil Won) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper, the air inside the vehicle for maintaining comfortable air freshener in accordance with changing conditions for changing the internal flow of information, this study is listed. Although there nay be many conditions, this paper includes three cases, the changing angle between filter located inside the air freshener and incoming air, the changing location of the entrance and the changing entrance angle of air. In addition, the filter pressure drop Vs. mass flow rate experiments needed to interpret the performance of the filter material was derived.
전동식 워터펌프의 세라믹 PCB 냉각특성에 관한 해석적 연구
전한별(Han-Byeol Joen),조중원(Chung-Won Cho),박종원(Jong-won Park) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In an electric water pump, the conventional PCB components and ceramic PCB components were modeled to perform the thermal analysis. When the results of the thermal analysis come out, the distribution of component temperature of the two modelling is understood and the cooling effect of the model was analyzed. The thermal conductivity of ceramic PCB is 5 times increased than conventional PCB. The thickness of ceramic PCB is 0.5 times reduced than conventional PCB. The element maximum temperature of ceramic PCB is 19℃ reduced than conventional PCB and the element average temperature of ceramic PCB is 22℃ reduce than conventional PCB.
전동식 스크롤 압축기를 적용한 루프형 전동식 냉방시스템의 성능특성에 관한 연구
이무연(Moo-Yeon Lee),조중원(Chung-Won Cho),이호성(Ho-Seong Lee),임택규(Taek-Kyu Lim),전한별(Han-Byeol Jeon),원종필(Jong-Phil Won) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The objective of this study is to investigate the cooling performance of the roof mounted air-conditioning system using electric driven scroll compressor for zero emission vehicles. This air conditioner with air source was used R-134a as a refrigerant and tested under various operating conditions such as refrigerant charge amount and indoor temperature, and compressor frequencies. Experimental results revealed that at all tested compressor frequencies, heat transfer rate of the evaporator increased and the cooling COP increased with the indoor temperature. In addition, the heat transfer rate of the evaporator was over 25.0kW sufficient for the cooling loads of an electric bus.
나노유체를 이용한 써모사이폰의 열전달 성능 특성에 관한 실험적 연구
이무연(Moo Yeon Lee),조중원(Chung Won Cho),이호성(Ho Seong Lee),원종필(Jong Phil Won),임택규(Taek Kyu Lim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.11
본 논문은 나노유체를 적용하여 써모사이폰 열전달 성능 특성 변화를 실험적으로 규명하는 것을 목적으로 하고 있다. 이를 위하여, 증발부 내부체적을 공유하는 3 개의 독립된 파이프를 가지는 써모사이폰을 제작하였으며 증류수, Ag 나노유체 그리고 TiO₂ 나노유체에 대하여 충진량, 증발부에 가해지는 입력열량 그리고 농도변화에 따른 써모사이폰 성능특성 변화를 고찰하였다. 증류수를 작동유체로 사용하는 경우 써모사이폰의 최적충진량은 30%로 결정되었고, TiO₂ 나노유체를 적용하는 써모사이폰 열저항이 Ag 나노유체를 적용한 경우에 비하여 평균 18.1% 감소하였다. 또한, 300W 입력열량 및 TiO₂ 나노유체 농도 1%에서 써모사이폰의 열전달 성능은 가장 우수하였다. This study aims to experimentally investigate the heat transfer characteristics of a thermosyphon using nanofluids. A thermosyphon with three individual pipes, which share the internal volume of the evaporator section, was designed, and its performance was tested for various charge amounts, input powers of the evaporator section’s heater, and concentrations of working fluids. The optimized charge amount of the thermosyphon using distilled water was 30%, and the thermal resistance of the thermosyphon with TiO₂ nanofluid was 18.1% lower than that with Ag nanofluid. In addition, the heat transfer performance of the thermosyphon with TiO₂-1% was optimized at an input power of 300 W at the evaporator section’s heater and a charge amount of 30%.
전산해석을 통한 자동차용 공기청정기의 내부구조변화에 따른 내부유동변화에 대한 연구
임택규(Taek-Kyu Lim),조중원(Chung-Won Cho),원종필(Jong-Phil Won),이호성(Ho-Seong Lee),정영철(Young-Chul Jung),모지환(Ji-Hwan Mo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, computerized analysis program, SC / Tetra by car air freshener in accordance with the structural changes of the internal flow rate and pressure for change was evaluated. The air flow velocity at the entrance to the all 62CMH same, each model and size of filter and air filter has a different angle between the direction of the flow conditions. Analysis of data on air permeability of the filter at the current NF Sonata vehicles equipped with an air purifier could be obtained through experiments based on flow NF Sonata, also on the basis of the vehicle air freshener to 15 CMH ~ 70 CMH 5 CMH unit increase were measured. Analysis of grid used in the Prism, Tetra has been used for more than a total of 2.2 million is composed of the elements. Prism layer of wall starts with an initial grid size of 1.1 times the growth rate was 3 layered configuration, all the other grid was composed of Tetra. The turbulence model is built from commercial CFD code, and the standard k-ε model was applied. In this study, for each model, the internal distribution of each filter of the velocity and pressure was tested via analysis of air fresheners to improve the durability of filter optimization can be predicted using the data.