http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이대웅,오소형,임대현,정회범,유승을,구영모,박권필,Lee, Daewoong,Lim, Daehyun,Oh, Sohyeong,Chung, Hoi-Bum,Yoo, Seung-Eul,Ku, Young-Mo,Park, Kwonpil 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.2
In the proton exchange membrane fuel cells (PEMFC), the development of a reinforced membrane with improved durability by a support is actively in progress in Korea. In this study, the initial performance and characteristics of four types of reinforced membranes were compared. Reinforced membranes with higher amounts of C-F chains in the polymer membrane showed lower water diffusion coefficients due to the hydrophobicity of the C-F chains. The thicker the polymer membrane, the more the hydrogen permeability decreased and the higher the OCV. Membrane with short resistance below 1.5 Ωcm<sup>2</sup> showed OCV below 0.9 V and the lowest performance, so short resistance should be above 3.0 Ωcm<sup>2</sup>. Compared with the current standard membrane, there was a similar domestic membrane, which could confirm the possibility of localization of PEMFC polymer membrane. 고분자전해질 연료전지(PEMFC)에서 지지체에 의해 내구성을 향상시킨 강화막(Reinforced Membrane)의 개발이 국내에서 활발히 진행되고 있다. 본 연구에서는 4 종류의 강화막의 초기 성능 및 특성을 비교하였다. 고분자막의 C-F사슬의 양이 더 많은 강화막이 C-F사슬의 소수성 때문에 물 확산계수가 더 작음을 보였다. 고분자막 두께가 두꺼울수록 수소투과도가 감소하고 OCV가 증가함을 확인하였다. Short 저항이 1.5 Ωcm<sup>2</sup> 이하인 막은 OCV가 0.9 V이하이고 성능도 최저여서 Short 저항이 3.0 Ωcm<sup>2</sup> 이상이어야 함을 보였다. 현재 기준이 되는 국외 막과 비교했을 때 비슷한 국내 막도 있어서 PEMFC 고분자막의 국산화 가능성을 확인할 수 있었다.
차량용 공기 순환 장치가 후석 승객의 온열 쾌적성에 미치는 영향에 관한 연구
이대웅(Daewoong Lee) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.11
Recently, automotive industry in Southeast Asia and India has enlarged and lifestyle has been changed, with time spending in an automotive showing a gradual increase. Accordingly, thermal comfort that passengers feel inside the cabin of an automotive is more important than other region. Current air-conditioning system is dependent on the cool-down performance of an HVAC located inside the front instrument panel that supplies cold air from the front cabin to the rear cabin. Therefore, front seat passengers and rear seat passengers can feel thermal comfort quite differently because of solar radiation through windows, air flow velocities, and blowing air path in the cabin. In this study, to increase thermal comfort for rear passengers, especially those in 2nd row and 3rd row seats, an air-circulator was developed. The air-circulator was subjected to computational fluid analysis to find the appropriate airflow volume, air distribution rate, and air direction for passengers in 2nd row and 3rd row seats. Air-conditioning system cool-down performance, PMV, and subjective evaluation of thermal comfort of vehicle experiments were also carried out. As the result, roof top mounted air-circulator was optimized by computational analysis and experimental study. It was a quite good solution for improving cabin thermal comfort for passengers in 2nd row and 3rd row seats with cost effectiveness and a compact package.
자동차 실내 열부하 저감을 위한 태양에너지 응용기술 검토에 관한 연구
이대웅(Daewoong Lee),장길상(Gilsang Jang),오동훈(Donghoon Oh),조경석(Kyungseok Cho),김용철(Yongchul Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The aim of this paper is to investigate solar energy application for reducing cabin thermal load. When the vehicle parked under the sun in summer, interior temperature is up to 70℃ which is depend on solar intensity. So, solar, one of the alternative energy considered as vehicle thermal comfort solutions, and conducted vehicle cabin thermal load accumulation with forced ventilation for solar energy simulation. Only operating of the air handling system blower by using external power supply, average temperature of cabin room reduced about over 10℃ to 20℃. Means, cabin thermal comfort is improved without extra energy consumption in the vehicle, and cool down performance of air-conditioning system will is better than current vehicle. Moreover fuel economy will be increased due to less air-conditioning system operating and have many opportunities of human advantage such as minimized VOCs by suppling clean air to cabin and healthy cabin environment by dehumidification of evaporator.
공회전 제한장치 차량용 축냉 열교환기의 성능에 대한 연구
이대웅(Daewoong Lee),권대복(Daebok Keon),정석제(Sukjae Chung),정춘식(Chunshik Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
ISG system for the fuel economy and emission is very useful technology in the recent automobile industrial. However, when engine stop, air-conditioning system don"t work due to compressor stop arise from passenger"s thermally dis-comfort. This study represented the cold storage system applied cold storage heat-exchanger integrated with evaporator. The experiments were conducted for optimum cold storage heat-exchanger design with different refrigerant flow pass, fin height and density, phase change materials in the heatexchanger. Also the cold storage release performance are examined effect on the ambient temperature and supplying air flow volume rate. The visualization of phase change material freezing and melting process inside cold storage heat-exchanger are conducted. The experimental results, air discharge temperature of cold storage system applied optimum cold storage heat-exchanger is 116 second delay to reach the 18°C set on the cabin comfort temperature range than current air-conditioning system. Finally, cold storage heat-exchanger integrated with evaporator is effective solution for ISG vehicles, to keep the thermal comfort in the cabin when short period of engine stop.
무공해자동차용 R134a 히트펌프 시스템의 성능에 미치는 영향에 대한 실험적 연구
이대웅(Daewoong Lee),오동훈(Donghoon Oh),지용준(Yongjun Jee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper deals with the experimental study for the heating performance that could be used for R-134a automobile heat pump systems. Heat pump system is widely studying for zero emission vehicle"s heating system due to small power consumption and effectively heating in the cabin. This paper presents experimental results of the influence of the heating capacity and coefficient of performance. The test was performed with different size of inside heat exchangers and outside heat exchangers, also refrigerant flow rate was considered in two way of flow devices. And heat source, means air heat source and water heat source with heat pump system was examined. The experimental results with heat pump system is to analyze the impact on performance. The best combination of performance is A-inside heat exchanger, B-outside heat exchanger, and B-flow device respectively. And water heat source is roughly 40% better performance than air heat source heat pump system.
공조장치 연계형 시트공조 시스템의 냉난방 성능에 대한 실험적 연구
이대웅(Daewoong Lee),박태용(Taeyong Park),정석제(Sukjae Chung),정춘식(Chunshik Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The aim of this paper is to investigate the application of low cost CCS(Climate Control Seat) using a HVAC(Heating, Ventilation and Air-Conditioning) system. CCSs is being vigorously purposed because requests for passenger`s thermal comfort are increasing. However current CCS, which is thermoelectric device have been applied for both heating and cooling, used limited luxurious car only. HVAC type CCSs are well suited for effective delivery of conditioned air due to thermal comfort and close proximity to the occupants. Experimental results show that the HVAC type CCCs have superior cooling performance and slightly uncompetitive heating performance than that of TED type CCS. In the case of HVAC type CCSs, air flow volume was increased approximately 3.7~7.3㎥/h than TED type CCS. and surface temperature of seat was reduced about 5℃ and cool-down was similar than Base. Additionally, occupants subjective evaluation, HVAC type CCSs was reduced 8 minutes to reach the comfort rating 5 at cooling test and high comporting ration after 8 minutes at seat heating test than of TED type CCSs.
자동차 공조 시스템에서 중량 저감을 위하여 1.2t 두께를 갖는 AHU의 개발
이대웅(Daewoong Lee),윤정훈(Junghoon Yun) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.9
Recent trends in vehicle development have gradually been focused on fuel consumption and tailpipe emission. The greenhouse gas(GHG) regulations require a reduction in emission of roughly 30 % for the next 10 years. As a result, the automotive industry has a major challenge to enhance the fuel economy each year. In order to improve fuel economy, one of the solutions is to reduce the weight of the vehicle not only in the chassis parts, but also in the cabin components. Therefore, an attempt has been made to meet those requirements by developing an air handling unit(AHU) housing with a thickness of 1.2. For successful tooling, CAE analysis to implement an AHU housing with a thickness of 1.2 has been performed, taking into account both dynamic stiffness and injection mold flow analysis. Meanwhile, AHU housing mold for mass production was developed as optimized, taking into account the gate number, filling time, injection pressure and temperature, clamping force, volumetric shrinkage and deformation, and the mass product of AHU. Subsequently, the product made from mold met the engineering specification and design criteria through a radiated sound experiment. In this study, an AHU with a thickness of 1.2 was successfully developed by optimizing the mold structure and injection molding conditions, and attained the same dynamic stiffness and radiation sound as the current AHU housing with a thickness of 1.7 while reducing the weight by approximately 20 %.