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SI엔진에 있어서 냉간 시동시 총탄화수소 배출물 저감을 위한 시스템 개발
김종일(Jongil Kim),손정배(Jeongbae Son),홍명석(Myungsuk Hong),차정연(Jeongyeun Cha) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
It is well known that unburned hydrocarbons are abundantly emitted into the atmosphere at cold start in SI engine. Many nations tend to enforce regulations of emission much more strictly. This study was conducted to develop a system which reduces HC emissions at cold start using the device of temporary storage and recombustion after analyzing the emission characteristics of hydrocarbons during the cold start. The exhaust gas measurements are focused upon the first 30 seconds of operation after starting, with the engine and coolant initially at ambient temperature because this period has a major effect on HC emissions, over the FTP cycle. The engine examined is a 4-cylinder, 16-valve SI engine. K type thermocouples attached on the O2 sensor, the catalytic converter and the coolant, and each sensor for the engine were connected to the AfD board to find the parameters for storage time and recombustion mode. The emissions were initially enriched in light fuel alkanes and depleted in heavy aromatic species. It was decided that the maximum storage time was 30 seconds at cold start. The time for storage was decreased with warmed start because the 02 sensor's conversion at warmed start is much faster than that at cold start. The recombustion mode was selected by using the rate of throttle valve, engine speed, and operation conditions of purge solenoid valve to avoid engine torque Ouctuation.
드라이룸 트윈로터제습기와 싱글로터제습기의 에너지사용량비교
홍석균(Seokgyun Hong),박승태(Seungtae Park),금종수(Jongsoo Kum),박종일(Jongil Park),박승상(Seungsang Park),이수양(Sooyang Lee) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
Twin rotor dehumidifier is the energy-effective system that reuses the reactivation exhaust air, 80℃ 10g/kg', of the second desiccant rotor as the reactivation heat source of the first desiccant rotor. Comparing with a single rotor dehumidifier, it can save the energy up to 32% on design. Therefore, this twin rotor dehumidifier is the best equipment for the environment and energy saving.