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실내 CFD 해석을 위한 건물 형상 단순화 알고리즘 개발
박관용,김창민,최창호,박창영 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.5
Computational Fluid Dynamics (CFD) analysis had been generalized for indoor environmental evaluation. Simplification of target model’s geographical information is crucial for numerical simulation as it determines the accuracy and cost of the analysis. Previous studies on building simplification are not suited for numerical simulation as they were aimed for visualization. Geography simplification method was developed by excluding minor faces. The applicability of the method on CFD analysis was evaluated considering number of meshes and air speed error. The complexity and computational cost of the CFD model were reduced as simplified. The error of airflow was controlled from 0.001 to 0.099 m/s by the threshold of simplification. Despite the possibility of error on curved surface or non-convex region, the simplification algorithm was expected to be effective in practical numerical simulation.
유우사 내부 위치 및 작업 형태에 따른 분진 모니터링 및 분석
박관용,권경석,이인복,하태환,김락우,이민형,Park, Gwanyong,Kwon, Kyeong-Seok,Lee, In-bok,Ha, Taehwan,Kim, Rack-Woo,Lee, Minhyung 한국농공학회 2017 한국농공학회논문집 Vol.59 No.3
Organic dust generated inside livestock facilities includes toxic organic matters such as bacteria and endotoxin. Dust can cause respiratory disease for worker and livestock, and consequently, degradation of welfare and productivity. Influence of dust on livestock workers has been studied since the 1970s. However, exposure limit for cattle farmer has not been established, unlike exposure limit for pig and poultry farmer. Furthermore, study on air quality inside livestock facility, especially inside dairy farm has been rarely conducted in Korea. In this study, dust concentration of TSP, PM10, inhalable and respirable dust has been monitored in the commercial dairy house according to location and working activities. Bedding material inside the stall was one of the major sources of dust. The amount of dust was related to water content level of the bedding material. Dust concentration was relatively high in leeward location, and the highest concentration was measured during TMR mixing process. The maximum value of inhalable dust concentration was 29.1 times higher than the reference value as fine particles drop to the TMR mixer. Dust generated by TMR mixing was presumed to decrease by adjusting moisture and drop height of feed.