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유지용(Jiyong Yu),정민영(Minyoung Jung),이준용(Junyong Lee),최명식(Myungsik Choi),김광연(Kwangyeon Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
ISG(Idle Stop & Go) is a system for saving fuel during idle. The purpose of ISG system is fuel efficiency, Ecofriendly brand image and for meeting the federal regulations about emission. Especially ISG of auto-Transmission vehicle can save fuel consumption about 15% in traffic-jam mode. But system price is high to equip for small or diesel vehicle, so it is hard to be adopted many kind of vehicles. So the aim of this study is to introduce development stories of reducing system price. For these one, we made mule car and we can get feasibility test for development of system control logic.
유지용(Jiyong Yu),김세준(Sejun Kim),이준용(Junyong Lee),정민영(Minyoung Jung),김형준(Hyungjun Kim),김광연(Gwangyoen Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
ISG (Idle Stop & Go) system for Automatic-transmission equipped vehicle is developed for fuel saving consumed during idle stop. For this purpose, we made three kinds of system suit for the vehicle’s market positioning. One, called semiautomatic version, for small & TAXI vehicle and it operates when the driver changed the shift lever from D to Neutral. The second version, called automatic version, for conventional vehicle and it operates without any shift lever operation. The third one is Belt-Driven system and it developed only for Luxury class vehicle because of its NVH characteristic and higher cost. For these one, we developed our own Software and test procedure. And as a result, we can get more than 6%~30% of fuel economy improvement and eco-friendly brand image.
목업 테스트를 통한 창호 종류별 창호 결로방지 성능 평가방법
유지용(Yu, Ji-Yong),이규남(Rhee, Kyu-Nam),김영탁(Kim, Young-Tag),임아람(Lim, Ah-Ram),송진희(Song, Jin-Hee),송승영(Song, Seung-Yeong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
In this study, we validated and analyzed the performance evaluation methods of the condensation prevention on the window through mock-up tests. NFRC 500-2010 compares the condensation prevention performance of various windows by using condensation resistance value at specific indoor temperature(21℃) and humidity(30%/50%/70%). AAMA 1503-09 is advantageous to the evaluation of condensation prevention performance for the overall window, while KS F 2295 is advantageous to the evaluation considering the local parts of the window. The results show that high-performance glazing type is Low-e (Argon filled), followed by Low-e (Air filled) and conventional double glazing. Based on the results of this study, we will establish the evaluation method which is appropriate to the domestic circumstances and users" performance requirements.
설계 단계에서 적용 가능한 창호별 결로방지 성능 평가 방법에 관한 연구
유지용(Yu, Ji-Yong),이규남(Rhee, Kyu-Nam),김영탁(Kim, Young-Tag),임아람(Lim, Ah-Ram),송진희(Song, Jin-Hee),송승영(Song, Seung-Yeong) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.4
The objective of this study is to derive the condensation preventing performance (temperature Difference Ratio) by part of the window, which can be evaluated at design stage by means of computer simulation. There are two evaluation methods that is available at design stage: One is the method that estimates the temperature difference ratio(hereinafter TDR) with regard to the overall window (hereinafter method 1), the other is the method that calculates the TDR at each part of the window by using computer simulation (hereinafter method 2). As for method 1, the estimation is relatively simple, however, it is difficult to evaluate the performance at thermal bridge, which has high risk of condensation. As for method 2, the calculation is somewhat complicated, however, it is possible to evaluate the performance at thermal bridge. The evaluation result of typical windows shows that the performance estimated by method 1 is 23∼48% higher than method 2. As the result can underestimate the possibility of condensation at the heat bridge, it is needed to evaluate the performance at every point of the window, as suggested in method 2. However, method 2 has a restriction that the simulation should be conducted for every design. Thus it is required to establish a database that provides the TDR by part of the common windows, much like U-value.
SK케미칼 연구소에 적용된 친환경 기술 적용 효과 분석 : 에너지 및 수자원 절감 적용 효과를 중심으로
유지용(Ji-Yong Yu),이유하(Yoo-Ha Lee),이영렬(Young-Ryul Lee),양재웅(Jae-Woong Yang),박현근(Hyun-Geun Park) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The SK Chemical R&D center is an eco-friendly building designed as top score in the GBCC(GREEN BUILDING CERTIFICATE CRITERIA). This building has applied various eco-friendly technologies such as energy /water resource cutdown, improvement of indoor quality and improvement of user convenience, etc through eco-friendly concept from the design phase. In this thesis, an economic efficiency evaluation has been performed on building energy cwater resource cutdown technologies among them and the results are as follows. The building energy has cut down about 40% compared to ordinary buildings and the investment recovery period was shown as about 5 years. The water resource has cut down about 63% compared to ordinary buildings and the investment recovery period was shown as about 10 years.