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이학용(Hakyong Lee),황준하(Joonha Hwang),조정길(Jeonggil Cho),김종률(Jongryul Kim),김승기(Soongkee Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A brand new 1.2L B series DOHC has been launched from GMDAT aiming at high value engine to satisfy the various requirement of customers from the emerging countries as well as the developed countries in terms of the performance and cost. In addition, the improvement of quality, reliability, and durability was another important point and the cost effective, but efficient new designs had been applied to the engine. An optimized combustion chamber including strong squish flow and PDA system have guaranteed the engine performance and fuel economy. New PCV ventilation system, maintenance free chain drive system, and durable sealing have made the engine to be more reliable in real field. This new engine has been fully validated by global engine and vehicle validation process. Globally competitive performance including part load fuel consumption has been achieved. Especially, the vehicle equipped with the engine showed best in segment level of fuel economy in Korea and Europe. Therefore, this new engine has been providing another valuable engine to customers in the world.
방승기(Seung-Ki Pang),안혜린(Hye-Rin Ahn),이원근(Won-Keun Lee),문기선(Ki-Sun Moon),김종률(Jongryul Kim),이광호(Kwang-ho Lee) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.4
In order to improve air quality of indoor environment, studies of the underfloor air distribution (UFAD) system for application in buildings are actively in progress based on temperature and air flow distribution. However, although the age of air is the major evaluation parameter, there has been very little study on this parameter for the UFAD system. In this study, we investigated the age of air to reach the air diffuser, which is installed at the bottom of the interior by the UFAD system. Computational fluid dynamics simulations showed no regular pattern to the maximum value of the age of air in accordance with air flow rate and the velocity at air diffuser. These factors can be deduced from air movement by considering that air emitted from air conditioners was rotated according to the bottom shape of the floor, and then, the age of air in the rotation center was increased. The average age of air of internal interior was reduced considerably as the flow velocity at the underfloor air diffuser was increased from 0.5 m/s to 1.0 m/s However, the age of air was not substantially affected with change in the air volume. Moreover, when the flow velocity at the underfloor air diffuser was higher than 1.0 m/s, the age of air showed no significant difference with change in air volume or height of measurement. These results imply that indoor air quality is more substantially influenced by flow velocity than air volume, and the appropriate flow velocity is 1 m/s or more.