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CFD 기술을 활용한 2-D 구조에서의 환기 효율 분석 방법 개발
권경석 ( Kyeongseok Kwon ),이인복 ( Inbok Lee ),한화택 ( Hwataek Han ),신철용 ( Chulyong Shin ),홍세운 ( Sewoon Hong ),황현섭 ( Hyunseob Hwang ),서일환 ( Ilhwan Seo ),( J. P. Bitog ),유재인 ( Jaein Yoo ),김용희 ( Yonghee Kim ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
In researches related to ventilation of agricultural facilities, it is very important to conduct quantitative analysis with visualization of the aero-fluid patterns to evaluate its ventilation system. Recent ventilation researches have been using a new concept to quantitatively study the ventilation effectiveness; where the duration for air to remain inside the structure is considered. The "age of air" concept which is used to study ventilation efficiency was established by Sandberg (1981, 1983, and 1992). According to Sandberg, ventilation efficiency is higher if the time of fresh air to reach the spaces of the ventilated room delivers a shorter LMA and LMR values. The LMA and LMR parameters are used to evaluate the fresh air distribution and the ventilation system’s potential in exhausting contaminants inside the structure. As a basic approach to the quantitative study of the total or local ventilation efficiency in agricultural facilities, a 2-dimensional chamber structure was designed for casual analysis, making the inlet steadily fixed and the outlet being varied according to the investigated case. The total and local ventilation rates and its characteristic were analyzed based on the LMA and LMR theory. Computational fluid dynamics (CFD) technology which is a powerful tool in studying aero-dynamics especially on the ventilation mechanism and material transfers was employed in this study. The User define function (UDF) of CFD was used to compute the LMA and LMR values in every time step using the C language. A tracer gas approach following the pulse method was also used. The methodology as well as the results in this study was verified with the ventilation theory of Han et al. (1992, 1999). Theventilation efficiency and the ventilation characteristics were thoroughly investigated.
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