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파장별 태양복사를 고려한 차량 내부의 온도 및 열쾌적성 예측
이진운(J.W. Lee),장은영(E.Y. Jang),김종민(J.M. Kim),조민행(M.H. Cho),최해진(H-J. Choi),최상열(S.Y. Choi),김주헌(J. Kim),유홍선(H.S. Ryou),이성혁(S.H. Lee) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The main objective of this study is to investigate numerically thermal comfort and energy transport inside a passenger car considering spectral solar radiation. We used the discrete ordinates (DO) model considering spectral radiation effects to estimate the spatial temperature distribution for determining solar loads. The Fanger model is used for evaluation of thermal comfort in the passenger car. From numerical results, when considering spectral radiation effect, it is shown that higher cabin temperature is estimated and longer penetration of solar irradiation inside the cabin is predicted. These results show that the spectral radiation effect should be considered for thermal comfort analysis.
코로나 방전기가 없는 전기집진기의 나노입자 집진에 관한 수치해석
이진운(J.W. Lee),장재성(J.S. Jang),이성혁(S.H. Lee) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
This article presents computational fluid dynamics (CFD) simulations of nanoparticle movements and flow characteristics in laboratory-scale electrostatic precipitator (ESP) without corona discharge, and for simulation, it uses the commercial CFD program(CFD-ACE) including electrostatic theory and Lagrangian-based equation for nanoparticle movement. For validation of CFD results, a simple cylindrical type of ESP is simulated and numerical prediction shows fairly good agreement with the analytical solution. In particular, the present study investigates the effect of particle diameter, inlet flow rate, and applied electric potential on particle collection efficiency and compares the numerical prediction with the experimental data, showing good agreement. It is found that the particle collection efficiency decreases with increasing inlet flow rate because the particle detention time becomes shorter, whereas it decreases with the increase in nanoparticle diameter and with the decrease of applied electric voltage resulting from smaller terminal electrostatic velocity.
이진운(J.W. Lee),유홍선(H.S. Ryou),이성혁(S.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The present study investigates the effect of spectral solar radiation on the thermal comfort in a vehicle compartment. For achieving this goal, transmittance and reflectance for automotive glass were measured to analyze the spectral characteristics of glass by using a spectrophotometer. Using the measurement data, extensive numerical simulations were conducted for three different cases by using the ANSYS Fluent 13.0. The Fanger model was also used for analysis of thermal comfort in the vehicle compartment. From numerical results, the temperature predicted for case 3 with considering spectral effect was approximately 3°C higher than that of case 1 without considering spectral effect. These results show that the spectral radiation effect should be considered for thermal comfort analysis