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간척지 인근 농경지에서의 비산 및 부유먼지 확산 모니터링(II): 김제 모니터링
황현섭,이인복,신명호,홍세운,서일환,유재인,권경석,김용희,Hwang, Hyun-Seob,Lee, In-Bok,Shin, Myeong-Ho,Hong, Se-Woon,Seo, Il-Hwan,Yoo, Jae-In,Bitog, Jessie.P.,Kwon, Kyeong-Seok,Kim, Yong-Hee 한국농공학회 2009 한국농공학회논문집 Vol.51 No.2
A study on fugitive dusts was conducted at Saemangeum reclaimed land located in Gim-je area. The monitoring result on the fugitive and suspended dust was significantly affected by the farming activities (harvesting and land cultivation) and vehicles passing nearby the measuring points. The concentration of the fugitive dust generated from the reclaimed land was reduced remarkably by the effect of halophyte present on the ground and the tide embankment. Comparing the data collected in 2006 and 2007, the concentrations of TSP and PM10 decreased by 47.4% and 29.5%, respectively. After harvesting operations at paddy field, TSP increased by 22% while PM10 increased by 54%. The concentration of a Cl- which is a representative ion of sea-salt decreased to about 35% in 2007 compared with 2006. This represents that the inside area change and plant covering rate affected on the decrease of fugitive dust. The correlation analysis for the compounds of topsoil at each measuring point shows that near the coastline is more comparable. The canopy of halophyte in the source area also increased which reduced the fugitive dust remarkably. The dust distribution measured by dust spectrometer at the same point shows that most particles are $0.5{\mu}m$ to 2um size but not greater than $5{\mu}m$.
비육돈사 작업 종사자의 호흡기 관련 공기 중 분진 농도 측정 및 분석
권경석,이인복,황현섭,하태환,하정수,박세준,조예슬,Kwon, Kyeong-Seok,Lee, In-Bok,Hwang, Hyun-Seob,Ha, Tae-Hwan,Ha, Jung-Soo,Park, Se-Jun,Jo, Ye-Seul 한국농공학회 2013 한국농공학회논문집 Vol.55 No.5
In swine house, dust generation comes from various sources and is known to be harmful both for the animals and the farmers because the dust contains biological and gaseous matters. When farmers are constantly exposed to the dusts, they can suffer chronic or acute respiratory symptoms and have high probability of manifesting various diseases. To address this problem, understanding of the mechanism of dust generation is very important. In this paper, the dust concentration of inhalable, respirable, TSP and $PM_{10}$ were monitored and analyzed according to the pig-activity level, ventilation quantity and feeding method in fattening pig house. From the measured results, in case of the concentration of TSP, an inverse-linear relation with ventilation rate ($R^2=0.88$) and linear relation with the installation height of feed supply pipe ($R^2=0.73$) were determined. However in case of the concentration of $PM_{10}$, no particular relationship with the variables was observed. Using the concentration of inhalable and respirable dust based on the pig-activity level, multi-variate regression analysis was conducted and results have shown that the movement of pigs can contribute to the dust generation (p<0.05, $R^2=0.71$, 0.61). The relationship determined between dust generation and environmental variables investigated in this study is very significant and useful in conducting dust-reduction researches.
전산유체역학 기법을 이용한 돈사 내 습식 공기 정화기의 적정 위치 설계
권경석,이인복,황현섭,홍세운,서일환,최지선,송상현,문운경,Kwon, Kyeong-Seok,Lee, In-Bok,Hwang, Hyun-Seob,Bitog, Jessie.P.,Hong, Se-Woon,Seo, Il-Hwan,Choi, Ji-Sun,Song, Sang-Hyeon,Moon, Oun-Kyung 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3
In South Korea, as the living standard has been getting higher, meat consumption is steadily increasing. To meet the country's demand, livestock houses become larger and wider with increased raising density. In larger livestock houses, pollutants such as flake of pig skin, excrement, odor, various dusts and noxious gas like ammonia are excessively accumulated inside the facility. These will cause weak immunity for the pigs, diminution of productivity and degeneration of working condition. These problems can be solved through the ventilation performance of the facility. In the winter time, ventilation must be controlled to minimum to maintain a suitable thermal condition. However, this affects the other internal environmental condition because of the minimum ventilation. The installation of "wet air cleaner" especially in the winter time can be an alternative solution. For efficient application of this machine, there is a need to understand the existing ventilation condition and analyze the interaction of existing ventilation system with the wet air cleaner considering its appropriate location. In this study, the existing ventilation system as well as the internal environmental condition negatively inside the facility with the wet air cleaner has been studied using CFD technology. The CFD simulation model was validated from the study conducted by Seo et al. (2008). Results show that the elimination rate of ammonia was 39.4 % and stability could be improved to 35.1 % (Comparing case 5 to 1 where wet air cleaner machine was not used). It can therefore be concluded that case 5 shows the optimum location of a wet air cleaner in the livestock house.
강제환기식 돈사의 환기 효율성 분석을 위한 CFD 모델 개발
서일환,이인복,홍세운,황현섭,유재인,권경석,하태환,김현태,Seo, Il-Hwan,Lee, In-Bok,Hong, Se-Woon,Hwang, Hyun-Seob,Bitog, Jessie Pascul,Yoo, Jae-In,Kwon, Kyung-Suk,Ha, Tae-Hwan,Kim, Hyeon-Tae 한국농공학회 2008 한국농공학회논문집 Vol.50 No.1
When livestock facilities in Korea have been changed larger and denser, rearing conditions have been getting worse and the productivity of animal production have been decreased. Especially in the cold season, the minimized ventilation has generally been operated to save energy cost in Korea resulting in very poor environmental condition and high mortality. While the stability, suitability, and uniformity of the rearing condition are the most important for high productivity, the ventilation configuration is the most important to improve the rearing condition seasonally. But, it is so difficult to analyze the internal air flow and the environmental factors by conducting only field experiment because the weather condition is very unpredictable and unstable as well as the structural specification can not be easily changed by the researchers considering cost and labor. Accordingly, an aerodynamic computer simulation was adopted to this study to overcome the weakness of conducting field experiment and study the aerodynamic itself. It has been supposed that the airflow is the main mechanism of heat, mass, and momentum transfers. To make the simulation model accurately and actually, simplified pig models were also developed. The accuracy of the CFD simulation model was enhanced by 4.4 % of errors compared with the data collected from field experiments. In this paper, using the verified CFD model, the CFD computed internal rearing condition of the mechanically ventilated pig house were analyzed quantitatively as well as qualitatively. Later, this developed model will be computed time-dependently to effectively analyze the seasonal ventilation efficiency more practically and extensively with tracer gas decay theory.
간척지의 비산먼지 모니터링 및 이의 3차원 공기역학적 모델링
이인복 ( Lee In Bok ),황현섭 ( Hwang Hyun Seob ),홍세운 ( Hong Se Woon ),서일환 ( Il Hwan ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
While studies have been actively conducted to build a prediction system of dust diffusion at a large-scaled reclaimed land the objective of this study was to develop an aerodynamic numerical model to collect fundamental data for the studies. Saemangeum area, the experimental place of this study, is located at the western costal area, and its total area reaches to 28,300ha. CFD model were developed to overcome the difficulties of field experiment depending on very limited measuring points as well as dealing with the spacious area. The 3-D CFD model was designed with dust generation computed by the local GIS data was used to design the topography of Saemangeum area. All the seasonally collected data were used as the CFD input data as well as to improve the accuracy of the developed CFD model. The experimental results indicated that dust generated at Saemangeum was diffused very extensively and strongly depended on weather condition. Moreover, the dust contain salty contents which can be very harmful to plant production while the dust itself causes respiratory and eye diseases for human and animals. Through this study, it was recognized that the aerodynamic simulation can be very effective tool to build the prediction and alarm system of dust diffusion.
공력 저항 측정기를 이용한 방풍펜스 방진막의 공기 투과 저항력 측정
김락우,이인복,홍세운,황현섭,손영환,김태완,김민영,송인홍,Kim, Rack-Woo,Lee, In-Bok,Hong, Se-Woon,Hwang, Hyun-Seob,Son, Young-Hwan,Kim, Tae-Wan,Kim, Min-Young,Song, Inhong 한국농공학회 2013 한국농공학회논문집 Vol.55 No.6
Recently, damage occurrence by wind erosion has been increasing in society. In times past, such problems only took place in desert area ; however, in recent years, the wind erosion problem is spreading out to agricultural land. Wind erosion in agricultural land can cause loss of loam soils, the disturbance of the photosynthesis of the crop fields and serious economic losses. To overcome the mentioned problems, installation of windbreak fence can be recommended which function as disturbing strong wind and wind erosion. However, there is still no proper guideline to install the windbreak fence and the installation used to rely on the intuition of the workers due to the lack of related studies. Therefore, this study measured the aerodynamic resistance of screens of the windbreak fence using the apparatus for testing screens. The apparatus for testing screens was designed to measure pressure loss around the screen. Measured pressure loss by wall friction compensated for pressure loss to calculate the aerodynamic resistance of screens. The result of pressure loss by regression analysis derived the aerodynamic coefficient of Darcy-Forchheimer equation and power law equation. The aerodynamic resistance was constant regardless of the overlapped shape when the screen was overlapped into several layers. Increasing the number of layers of the screen, internal resistance increased significantly more, and pressure loss caused by the screen also increased linearly when the wind speed was certain conditions, but permeability had no tendency. In the future, the results of this study will be applied to the computational fluid dynamics simulation. The simulation models will be also validated in advance by wind tunnel experiments. It will provide standard of a design for constructing windbreak fence.
축사 환기팬 후류의 풍에너지 평가 및 기류 형상의 전산유체역학 모델링
홍세운,이인복,서일환,권경석,하태환,황현섭,Hong, Se-Woon,Lee, In-Bok,Seo, Il-Hwan,Kwon, Kyeong-Seok,Ha, Tae-Hwan,Hwang, Hyun-Seob 한국농공학회 2012 한국농공학회논문집 Vol.54 No.5
The objectives of this paper were to evaluate the wind flow behind the livestock ventilation fan for small-scale wind power generation and to make flow profiles of imaginary ventilation fan for future simulation works. The field experiments using typical 50-inch fan indicated that the wind flow behind the ventilation fan had a good possibility of power generation with its high and steady wind speeds up to a distance of 2 m. The expected electricity yield was almost 101~369 W with a small (0.8 m radius) wind turbine. The decline of ventilation fan performance caused by the obstacle was also not significant with about 4 % from a distance of 2 m. The flow profiles for the computational fluid dynamics (CFD) simulation was created by combining the direction vectors analyzed from tuft visualization test and the flow predicted by the rotating fan modeling. The flow profiles are expected to provide an efficient saving of computational time and cost to design a better wind turbine system in future works.
서일환 ( Il Hwan Seo ),이인복 ( In Bok Lee ),황현섭 ( Hyun Seob Hwang ),배연정 ( Yeon Jeong Bae ),배승종 ( Seung Jong Bae ),문운경 ( Oun Kyung Moon ) 한국농촌계획학회 2013 농촌계획 Vol.19 No.4
Most of livestock houses are concentrated in certain area with mass rearing system resulting in rapid spread of infectious diseases such as HPAI (highly pathogenic avian influenza). The livestock-related vehicles which frequently travel between farms could be a major factor for disease spread by means of transmission of airborne aerosol including pathogens. This study was focused on the quantitative measurement of aerosol concentration by field experiment while vehicles were passing through the road. The TSP (total suspended particle) and PM10 (particle matter) were measured using air sampler with teflon filter installed downward the road with consideration of weather forecast and the direction of road. And aerosol spectrometer and video recorders were also used to measure the real-time distribution of aerosol concentration by its size. The results showed that PM2.5 was not considerable for transmission of airborne aerosol from the livestock-related vehicle. The mass generated from the road during the vehicle movement was measured and calculated to 241.4 μg/㎥ by means of the difference between TSP and PM2.5. The dispersion distance was predicted by 79.6 m from the trend curve.