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신윤혁(Yoon Hyuk Shin),임동현(Dong Hyun Lim),김대건(Dae Geon Kim),안승구(Seung Ku Ahn),김기용(Ki Yong Kim),김성철(Sung Chul Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
To enhance the passengers thermal comfort in the vehicle cabin with internal combustion engine during cold start, supplementary heating is essential for compensating heating performance. Besides, efficient internal combustion engine vehicles with the low heat source caused by high fuel efficiency are increasing recently. Positive temperature coefficient (PTC) heater is one of the methods for effective supplementary heating. In this study, the PTC elements were made by typical manufacturing processes including forming ohmic contact layer, and prototype of PTC heater was designed and made for the engine vehicle. We also investigated the performance characteristic of the PTC heater through the experiments, and compared the performance among each of commercial PTC heaters. Therefore, the experimental results indicated that prototype of PTC heater had satisfactory performance. This study will contribute to developing the novel manufacturing processes and reducing the material cost of the PTC elements.
2단 클러치 타입 워터펌프의 연비향상에 대한 실험적 연구
신윤혁(Yoon Hyuk Shin),김대건(Dae Geon Kim),임동현(Dong Hyun Lim),김성철(Sung Chul Kim),손석우(Seok Woo Son) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Generally, when internal combustion engine is started, its cooling system operated in connection with engine provides excessive cooling, resulting in unnecessary energy consumption and excessive exhaust gas emission. In case of high engine speed, excessive cooling makes combustion efficiency decrease. To enhance the efficiency of combustion engine in these case, effective control of cooling system according to operating conditions of engine can be realized by changing mass flow rate of coolant using electromagnetic clutch water pump. We designed two types of water pump; planetary gear type water pump which can reduce rotation speed of water pump by 65%, compared with pulley and on/off type water pump which can stop operation of impeller. Performance evaluation consists of warm-up test and NEDC driving performance. Warm-up test result shows that the time-shortening effect of planetary gear water pump and on/off water pump was improved by 7.3% and 24.7% respectively, compared with that of conventional base water pump. And NEDC test result shows that the fuel consumption of planetary gear water pump and on/off water pump, compared with base water pump, was improved by 7.3% and 4.0%, respectively. It is estimated that application of clutch water pumps will contribute to the improvement of engine cooling system performance, whose enhancement of fuel consumption rate is similar to that of electric water pump.
상용차 엔진 냉각용 가변 유량식 2단 클러치 워터펌프의 구조 해석에 관한 연구
신윤혁(Yoon Hyuk Shin),김대건(Dae Geon Kim),김성철(Sung Chul Kim),손석우(Seok Woo Son) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The change of the flow rate of coolant in engine cooling system is a good method to save fuel and to reduce emissions by incomplete combustion. Using the water pump changing the flow rate of coolant allows the engine cooling system to work in the optimum operation condition. In this study, we have designed a 2-stage clutch water pump which has planetary gears to change the flow rate of coolant for cooling an internal combustion engine. And structural for the 2-stage clutch water pump also have been described in two cases. The results of structural analysis will be basis to design and improve the safety and performance of the 2-stage clutch water pump.
휜 타입 내부열교환기의 구조 변경에 따른 차량용 냉방시스템 성능 비교특성에 대한 실험적 연구
신윤혁(Yoon Hyuk Shin),정정훈(Jung Hun Jung),정영철(Young Chul Jung),김성철(Sung Chul Kim),진원재(Won Jae Jin) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Internal heat exchanger(IHE) apparatus using the temperature difference between high and low pressure line in vehicle air conditioning system is a good method to enhance the cooling performance of the alternative refrigerants compared to the existing refrigerants. In this study, we have made a double-pipe internal heat exchanger which has fins between the inner pipe and outer pipe. We also have measured the overall performance(cooling capacity, compressor power and coefficient of performance) evaluation of the modified internal heat exchangers that had the change of the fin height and the inside shape of the inner pipe. This experimental results will be basis to improve and optimize the performance of internal heat exchanger with inner fin.
신윤혁(Shin, Yoon Hyuk),김성철(Kim, Seong-Cheol) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.2
최근 디젤 차량과 같은 내연기관의 고효율화에 따라, 보조난방 열원으로서 PTC 히터의 사용이 증가하는 추 세이다. 디젤 차량의 시동 초기에는 냉각수의 온도가 난방으로 직접 사용하기에 충분히 높지 않으므로, 동절기 난방 을 위해 보조난방 열원은 필수적이다. 본 연구에서는 스크린 인쇄 전극공정을 바탕으로 한 PTC 소자를 제작하였고, 이를 활용한 PTC 소자 모듈 및 히터를 설계 및 제작하였다. PTC 소자 모듈의 방열핀 접촉형상 및 전열소자의 크기 변경에 따른 난방성능 변화를 열유동 해석을 통해 분석하였고, 난방성능 실험을 수행하여 PTC 히터의 난방성능 및 효율 특성을 살펴보았다. PTC 히터 시작품의 경우, 기존 PTC 히터와 동등한 수준 이상의 난방성능 및 효율을 나타 내었으며, 향후 이를 바탕으로 PTC 소자와 히터에 대한 공정개선 및 성능증대 연구를 수행할 계획이다. Using positive temperature coefficient (PTC) heater as supplementary heating for diesel engine vehicles with low heat source is a good method to enhance the heating performance during cold start. In this study, the PTC elements were made by using screen printing process for forming ohmic contact layer, and prototype of PTC heater was designed and made for a diesel engine vehicle. In process of designing the PTC heater, the thermal flow analysis of PTC element modules was conducted for verifying the effect of the shapes of contact surface between each of the components (cooling fin, insulator, ceramic element). We also investigated the performance characteristic (heating capacity, energy efficiency, pressure drop) of the PTC heater through the experiments. Therefore, the experimental results indicated that prototype of PTC heater had satisfactory performance. This study will be basis for improving the manufacturing process and increasing the performance of the PTC element and heater.
최원호(Wonho Choi),신윤혁(Yoon hyuk Shin),강인구(Ingoo Kang),임홍재(Hong Jae Yim),장시열(Siyoul Jang),정재일(Jay Il Jeong),이기성(Kee Sung Lee),임시형(Si-Hyung Lim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A UV Nano Imprint Lithography (UV-NIL) machine has been developed for micro/nanoscale patterning in an extremely large area like ~300×400 ㎟, To get high pattern fidelity, residual layer thickness uniformity, and an air bubble free layer in the large area, the UV-NIL machine has several main components including a silicon rubber uniform pressurizer, a large area UV-LED module, a vacuum pump, etc. Contact and structural analyses have been performed using commercial FEM packages like LS-DYNA and ANSYS. The developed machine has been tested and its performance indices such as pattern fidelity, residual layer thickness uniformity, etc have been measured.
인휠 모터 냉각 성능 향상을 위한 하우징 개선에 관한 연구
정정훈(Jung Hun Jung),신윤혁(Yoon Hyuk Shin),김성철(Sung Chul Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The automobile of the future recently will be able to substitute the electric vehicle for the internal combustion engine, so the research is actively to in the process of advancing. The drive motor is one of the core parts which compose the electric vehicle. Especially, it is difficult to connect cooling water piping because the in-wheel motor is located within the wheel structure. This structure is very disadvantage for closed type and air cooling, so cooling design of motor housing is important. In this study, thermo-flow characteristics analysis of in-wheel motor for vehicles was performed in consideration of ram air effect. In order to improve cooling efficiency of the motor, we variously changed geometries of housing and observed the effects. As result, we found that the cooling efficiency is most excellent in case the cooling groove direction was same with air flow direction and arranged densely.
임동현(Dong Hyun Lim),신윤혁(Yoon Hyuk Shin),김대건(Dae Geon Kim),김동현(Dong-Hyun Kim),김영광(Young-Kwang Kim),김성철(Sung Chul Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In the in-wheel motor driving system, that is one main part of the electric vehicle, the in-wheel motor plays an important role that generates vehicle power. For the miniaturization and performance improvement of the in-wheel motor, the proper thermal management is necessary. In this paper, the thermal characteristics of experimental in-wheel motor, including simple cooling structure, was analyzed by using computational fluid dynamics(CFD). According to the simulation result, the motor part has about 80~93℃ temperature distribution and the highest temperature(about 93℃) is shown in the bearing at low-load operating condition. Also, the heat transfer coefficient of cooling oil(395~495 W/m²? K) is lager than inner air(70~180 W/m²?K) and outer air(18~70 W/m²?K). In the future, the analysis reliability will be verified through temperature measurement experiment; and the results will be comparatively evaluated with oil circulation cooling system.
대용량 인휠 모터 구동용 인버터의 열유동 해석 및 영향도 분석
김대건(Dae Geon Kim),신윤혁(Yoon Hyuk Shin),임동현(Dong Hyun Lim),김성철(Sung Chul Kim),강지희(Ji Hee Kang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Recently, the electric and electronic devices in vehicles have been used increasingly for improving fuel efficiency and more pleasant driving environment. However, the in-wheel driving inverter inside engine room sometimes operates in the worst environment like high temperature. The power density of the inverter has become smaller and more increased. Thus, it is essential to manage the temperature of switching devices for performance and endurance, because the temperature can be getting increase. In this paper, we performed the thermal analysis of inverter base model (cooling channel) and confirmed the temperatures of main components. Also, we compared the cooling performance under various conditions such as coolant flow rate and layered power module structure.