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정영국(Youngguk Jung),이진규(Jingyu Lee),이주한(Juhan Lee),서태범(Taebeom Seo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The purpose of the research is to develop the high performance solar air receiver. Four different air receiver are suggested: three way type, spiral type, porous type, module type. The performances of these receivers are numerically estimated and experimentally measured. Using 128 core parallel computing machine, convection, conduction, radiation are calculated simultaneously. The transient temperature and concentration information is obtained from the calculation. The numerical results are compared with the experimental results. Good agreement is obtained. Four receiver are installed on the dish-type solar thermal system of Inha University. The temperatures, mass flow rates, pressure are measured. At the same condition, The three way type receiver was similar performance the spiral type receiver does. However, the spiral type receiver gives reasonably good performance without any problems caused by highly concentrated solar radiation.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
고만석(Manseok Ko),정영국(Youngguk Jung),조현석(Hyunseok Cho),신예원(Yewon Shin),서태범(Taebeom Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.