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간척지 인근 농경지에서의 비산 및 부유먼지 확산 모니터링(I) : 군산 모니터링
황현섭,이인복,신명호,홍세운,서일환,유재인,이승기,Hwang, H.S.,Lee, I.B.,Shim, M.H.,Hong, S.W.,Seo, I.H.,Ryu, J.I.,Lee, S.K. 한국농공학회 2008 한국농공학회논문집 Vol.50 No.4
A study on fugitive dust dispersion was conducted at Saemanguem reclaimed area located at the west coastal area of Jeon-buk Province Total reclaimed area is 40,100ha developed by building a 33km long sea dike through Gunsan, Gimje, and Buan. (Land: 28,300ha, Fresh Water Lake: 11,800ha) After this area was completely reclaimed in 2006, there has been high possibility of dust generation and dispersion to the neighboring area. The dust generated at the reclaimed land was composed mainly of minerals with high salinity, and it could make harmful effect on crop production as well on to human's health such as eye irritation and respiratory disease. Especially, when those aerosol particles are reached on the leaves of farm crops, the photosynthesis and respiration of the plants can be under restraint resulting in the decrease of agricultural productivity of the nearby farm areas. Furthermore, highly concentrated salty particles can directly damage the leaf cells. In this study, field experiment has been conducted to regularly measure the locally suspended dust particles and analyze how they were dispersed to the neighboring areas. The collected dust particles were analyzed to examine theirs sizes, concentrations, and components. The SPSS statistical program was also used to separate the dust concentration generated by the reclaimed land from the total dust concentration measured at the measuring locations.
새만금 지역 간척지 및 인근 농경지에서의 비산 및 부유먼지의 지역별, 시기별 모니터링
황현섭,이인복,신명호,이광야,홍세운,서일환,유재인,권경석,김용희,Hwang, H.S.,Lee, I.B.,Shin, M.H.,Lee, G.Y.,Hong, S.W.,Seo, I.H.,Yoo, J.I.,Bitog, J.P.,Kwon, K.W.,Kim, Y.H. 한국농공학회 2009 한국농공학회논문집 Vol.51 No.5
A study on fugitive dusts was conducted at Saemangeum reclaimed land and the neighboring farm located at the west coast of Korea. After the area was completely reclaimed in 2006, halophyte plants and several windbreak systems were installed. The distributions of suspended dust particle was regularly measured through field experiment. The size of dust source area was also analyzed periodically and then it was determined to be in the following order: Buan > Gimje > Gunsan. The suspended dust which were dispersed to the neighboring areas were significantly affected by the size of the soil particles, wind velocity and wind direction. The results of Big Spring Number Eight (BSNE) experiments also showed that the concentration of the fugitive dust generated from the reclaimed land was reduced remarkably by the presence of halophyte plants. Recently, in 2008, the measured dust concentration rate was decreased by an average of 30.6%. The average dust concentration is expected to decrease further as more areas are being covered by halophyte plants.
CFD 시뮬레이션을 활용한 미세조류 배양용 버블 칼럼 광생물반응기 설계
유재인 ( J. -i. Yoo ),이인복 ( I. -b. Lee ),황현섭 ( H. -s. Hwang ),서일환 ( I. -h. Seo ),홍세운 ( S. -w. Hong ),( J. Bitog ),권경석 ( K. -s. Kwon ),최지선 ( J. -s. Choi ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
Photobioreactors (PBRs) that houses and cultivates microalgae providing a suitable environment for its growth, such as light, nutrients, CO2,heat, etc. is now getting more popular in the last decade. Among the many types of PBRs, the bubble column type is very attractive because of its simple construction and easy operation. However, despite the availability of these PBRs, only a few of them can be practically used for mass production. Many limitations still holdback their use especially during their scale-up. To enlarge their culture volume and productivity by supplying optimum environmental conditions, various PBR structures and processes for controlling are needed to be compared. In this study, computational fluid dynamics (CFD) was used to design a bubble-column type PBR to economically take the place of field experiments. CFD is a promising technique which can simulate the growth and production of microalgae in the PBR. To study bubble column PBR with CFD, the most important factor is the possibility of realizing bubble. In this study, multi-phase models which are generally used were compared by theoretical approaches and 2D preliminary simulations. As a result, the VOF (Volume of Fluid)model was found to be the most effective to realize the bubble shape and flow inside PBR which is made by bubble injection. Considering the accuracy and economical efficiency, 0.005 sec of time step size was chosen for 2.5 mm mesh size. With these initial conditions, 3-D PBR trial simulation and PIV (Particle Image Velocimetry) validation test were conducted. The verified CFD simulation model will be used as criteria for PBR scale-up research.
돈사의 시설 및 환기구조에 따른 돼지 호흡기성 질병 발생 가능성
서일환 ( Seo I. -h. ),이인복 ( Lee I. -b. ),황현섭 ( Hwang H. -s. ),홍세운 ( Hong S. -w. ),( Jessie P. Bitog ),유재인 ( Yoo J. I. ),권경석 ( Kwon K. -s. ),김용희 ( Kim Y. -h. ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
The typical diseases for pigs in Korea are Porcine epidemic diarrhea (PED), Porcine reproductive and respiratory syndrome (PRRS), Post weaning multi-systemic wasting syndrome (PMWS), and Porcine respiratory disease complex (PRDC). The main factor for the occurrence of these diseases specially the respiratory diseases is the environmental condition particularly ventilation inside the pig house. Considering that Korea has 4 distinct season, the environmental condition in the pig house changes every season. The purpose of this study was to find the relationship between the configuration of the structure and ventilation system of pig houses and the occurrence of pig respiratory disease. The effect of internal airflow distribution to internal disease dispersion in pig house was analyzed. Several field experiments were conducted at several pig farms to understand the environmental control in relation to disease occurrence. To overcome the difficulties of conducting field experiments and obtain internal airflow visualization quantitatively and qualitatively, computational fluid dynamic (CFD). The accuracy of the simulations was preliminarily examined and improvements were made in the model based form the seasonally collected farm data.
이성현,윤남규,김경원,이인복,김태일,장진택,Lee S.H.,Yun N.K.,Lee K.W.,Lee I.B.,Kim T.I.,Chang J.T. 한국축산환경학회 2006 축산시설환경학회지 Vol.12 No.1
본 연구에서는 육성 비육돈 슬러리를 이용하여 슬러리의 환경조건에 따라 슬러리로 부터의 암모니아 발생 특성을 분석코자 하였다. 슬러리의 온도와 pH를 조절하여 슬러리로부터 발생하는 암모니아 농도를 측정 분석한 결과 슬러리의 온도가 높을수록 슬러리로 부터 발생하는 암모니아 농도는 급격히 증가하는 것으로 나타났고, 슬러리의 pH를 5, 6, 7, 8의 4수준으로 조절하여 각각의 온도에 따라 발생하는 암모니아 농도를 측정한 결과 pH 5, 6에서는 암모니아 가스가 검출되지 않았으나 pH 7, 8에서는 많은 양의 암모니아 가스가 검출되었고 양돈 슬러리의 pH가 높을수록 발생하는 암모니아 가스가 많이 발생하는 것으로 분석되었다. 본 연구결과 슬러리의 온도를 낮추어 주거나 슬러리의 pH를 낮춤으로써 슬러리로부터 발생하는 악취가스를 크게 줄일 수 있을 것으로 판단되었다. Ammonia emission from swine production process originates from three major sources: manure storage facility, swine housing, and land application of manure. Most of the ammonia gas that are emitted from swine production operations is the by-product of aerobic or anaerobic decomposition of swine waste by microorganism. Knowing the ammonia emission rate is necessary to understand how management practices or alternative manure handling process could reduce impacts of this emission on the environment and neighbors. Ammonia gas emission from pig slurry is very difficult to predict because it is affected by many factors including wind speed of slurry surface, temperature or pH of the swine slurry, sort breed differences and classes, and diets. This study was carried out to effects of pH and temperature on ammonia gas emission from growing-finishing pig slurry. Treated far slurry in this study were pH and temperature. Results showed that pH of slurry variable changes 5, 6, 7, 8 upon an addition of NaOH and $HNO_3$, respectively. The temperature of the slurry which was contained in a water bath maintained at increasing levels ranging from 10 to $35^{\circ}C$. Ammonia emission rate of influenced pH and temperature such that the increase in pH or temperature resulted to an increase in ammonia emission. The ammonia gas was not detected at pH 5 and 6. Moreover, at a slurry of pH 8, the ammonia ranged from 28 to 60ppm and 8-29 ppm at slurry pH of 7 while temperature was 13 to $33^{\circ}C$. When slurry pH was>6, the ammonia emission was significantly increased according to rise in temperature in contrast to acid treatment of the pH. There was also a significantly increase in ammonia emission relative to slurry pH of 7 to 8. The above findings showed that to effectively reduce ammonia emission from slurry of growing-finishing pigs, the pH and temperature should be maintained a low levels.
이권재(K. J. Lee),김정석(J. S. Kim),백대성(D. S. Back),이상재(S. J. Lee),한화택(H. T. Han),이인복(I. B. Lee),한건수(G. S. Han) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
An experimental study has been performed to investigate the heating performance of the heat pump with the ventilation system under a heating condition. The heating performance of the heat pump were measured by the psychrometric calorimeter and were experimented at the heating standard condition of KS C 9306. Also, the heating performance was studied under the temperature conditions of the ventilation system along the temperature efficiency by using EES program. The heat pump with the ventilation system was higher about 1.5%~3% for the heating capacity and about 4%~9% for COP than that without the ventilation system. The effect of the effective enthalpy efficiency of the ventilation system was not significant for the heat pump performance.