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축냉 증발기 적용을 통한 ISG Mode 시 냉방성능 유지 효과에 대한 실험적 연구
전영하(Youngha Jeon),오광헌(Kwanghun Oh),왕윤호(Yoonho Wang) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
Recently regulations regarding CO2 emission and fuel economy of automobile are being released. To cope with the regulations, ISG (Idle-Stop and Go) mode is being widely applied to conventional and hybrid car with decreasing compressor driving time. In this paper, effect of cold storage system which can maintain cooling performance and thermal comfort during ISG mode is dealt. The system consists of evaporator including cold storage material inside and other parts which are used in conventional air-conditioning system, and other additional part was not used. This paper presents experimental results of cooling performance during ISG mode and test was conducted in system bench stand. Evaporators with different size and several cold storage materials were compared. As a result, cold storage evaporator could maintain thermal comfort during about 40 seconds longer than conventional system. It is identified that cold storage evaporator can be used also in high speed condition to improve fuel economy through compressor on/off control.
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.
ISG Mode 시 축냉 시스템의 냉방 효과에 대한 실험적 연구
전영하(Youngha Jeon),오광헌(Kwanghun Oh),정순안(Sunan Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently regulations regarding CO2 emission and fuel economy of automobile are being released. To reduce fuel consumption through decreasing compressor driving time, ISG (Idle-Stop and Go) mode is being widely applied to internal combustion engine and hybrid vehicle. In this paper, cooling effect of cold storage system which can provide thermal comfort during ISG mode is validated. The cold storage system consists of the evaporator including cold storage material inside and other parts which are being used in conventional air-conditioning system. In this system, other additional part is not needed for cold storage function. This paper presents experimental results of cooling performance during ISG mode and the vehicle test was conducted both in climate wind tunnel and on road. From previous research, it can be assumed that the outlet air temperature below 15℃ is in the thermal comfort range.6), 7) In climate wind tunnel test, cold storage system could keep thermal comfort during 221~255 seconds which is longer than conventional system by 35~46%. In urban traffic test, which average stop time in accordance with traffic signal was 66.3 seconds, cold storage system could cover 89% stops without compressor restart keeping thermal comfort. Whereas conventional system should restart compressor in 56% stop to keep outlet air temperature below 15℃.
차량 난방 성능 향상을 위한 하이브리드 PTC 히터 적용에 관한 연구
구중삼(Jungsam Gu),오광헌(Kwanghun Oh),정순안(Sunan Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently internal combustion engine’s efficiency has been improved dramatically from customer’s demand that is to get car of good fuel efficiency. But air conditioning side is necessarily lacking the heat source for heating cabin room due to the decreased waste heat from engine. For this reason, PTC heater has used as auxiliary heater. PTC heater was being applied to diesel engine to improve early thermal comfort in cold start and the application is being expanded into gasoline engine as well. In conventional PTC heater, HVAC package size increases due to separated structure from coolant heater. Also temperature distribution and heating performance decrease because PTC heater cannot cover overall effective area. So there is a demand of new technology which can improve heating performance. In this paper, the hybrid PTC heater’s heating performance is validated. The hybrid PTC heater consists of conventional coolant heater and new PTC heater with thin profile. In the structure, two heaters are integrated into one assembly with no gap. The hybrid PTC heater can compensate waste heat loss and improve HVAC package size.
차량용 공조시스템에서 중량저감을 위하여 1.2t 두께를 갖는 AHS 개발
윤정훈(Junghoon Yun),이동원(Dongwon Lee),이대웅(Daewoong Lee),강성호(Sungho Kang),왕윤호(Yoonho Wang) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The development trend of vehicles has increasingly been focusing on reducing fuel consumption and emissions. Recent automotive industry has big challenge to improve the fuel economy and to meet the GHG (Green House Gas) regulations. The GHG regulations required to reduce emission about 30% by next 10 years. To meet the regulations, one of the solution is weight down in the vehicle components not only chassis parts but also cabin parts. So, development of 1.2 thickness thin AHS (Air Handling System) case to meet those requirements was tried. First we experienced in proto tooling base on the CAE analysis. The 3D AHS CAD modeling was designed considering stiffness and stress analysis by CAE, which is using mold flow program. After then AHS mold for mass production was developed with optimized gate, rib thickness, draft angle, and shape of surface. Finally, 1.2 thickness AHS case was developed successfully and meet to engineering specification and design criteria. In addition, tooling technologies and CAE analysis for 1.2 thickness AHS case was set-up.
2중 증발 시스템의 원리와 냉방 및 연비 성능 개선 효과에 대한 연구
이해준(Haejun Lee),안용남(Yongnam Ahn),정춘식(ChunShik Jung),왕윤호(Yoonho Wang),김재연(Jaeyeon Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In many countries, Regulations regarding CO2 emission reduction are recently being released. It is becoming more and more important to improve the fuel efficiency of vehicles in the automotive industry. Due to these circumstances, advanced technologies improving the efficiency of the air conditioning system which affects actual fuel efficiency of vehicles have been developing for many years. In this paper, two-zone separated evaporation system which can maximize evaporator & expansion valve`s efficiency is studied. Two-zone separated evaporation system consists of two key technology, dual evaporator and dual expansion valve. Unlike the typical evaporator, the dual evaporator has parallel flow in two rows independently. In 1st row, it is necessary to supply more refrigerant flow rate to 1st row, as higher portion of the cooling is done. In 2nd row, to further cool the air, the refrigerant which is less pressure & temperature than that of the 1st row has to be supplied to the 2nd row. Dual expansion valve expands into the two phase regions and distributes refrigerant to each row of the dual evaporator. This paper presents experimental results of cooling performance in test mode to simulate vehicle cabin cooling evaluation. The conventional system & two zone separated evaporation system were compared in bench and vehicle test mode. As a result, two-zone evaporation system has 10% higher A/C efficiency than conventional system. It is identified that applying two-zone evaporation system to vehicles can improve fuel efficiency.
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.
수냉식 응축기를 활용한 자동차용 에어컨 시스템 효율 향상에 관한 실험적 연구
최준영(Junyoung Choi),원승식(Seungsik Won),안용남(Yongnam Ahn),신현근(Hyunkeun Shin),왕윤호(Yoonho Wang),김재연(Jaeyeon Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Recently regulations regarding C0₂ emission and fuel economy of automobile are being increased. Accordingly power consumption reduction of Mobile Air-Conditioning system(MAC) has been continuously requested. There have been numerous attempts to use a water-cooled condenser instead of conventional air-cooled condenser in an airconditioning system. This paper describes an experimental results of using water-cooled condenser in air-conditioning system. Using additional water-cooled condenser was the most effective way among numerous water-cooled condenser systems. The water-cooled condenser cools refrigerant from superheated state to a two-phase state and the air-cooled condenser cools from two-phase state to sub cool state. This was named combined cooling condenser system which had both a water cooled condenser and an air cooled condenser. Bench and vehicle test were conducted to verify the effects to reduce power consumption due to decreased discharge pressure of air-conditioning system. By using combined cooling condenser system, A/C efficiency improved about 9.4% over the conventional A/C system.