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대기배출시설의 입자상물질 측정과정과 배출허용기준 개선방안 연구
조광운,서동주,김승호,김난희,서광엽,배석진,조영관 한국환경정책학회 2019 環境政策 Vol.27 No.1
In this study, we assessed the main emission characteristics of particulate matter and total hydrocarbons from an air discharge facility in the Gwangju area from 2013 to 2017. We examined the measurement process of particulate matter and evaluated the permissible emission standards for total hydrocarbons. 1) By measuring the discharge flow rate from the air discharge facility, we found that there were many facilities where the measured flow rate exceeded the facility flow rate. In order to accurately measure the actual flow rate, it is necessary to either change the position of the measurement port or improve the facility. Alternatively when the flow rate is not measured, it is necessary to thoroughly inspect the preventive facility. 2) After acetone washing and drying of the cylindrical filter for dust measurement, it is possible to reduce the influence of the cylindrical filter paper on the measurement result by measuring after removing the residue outside the filter. Therefore, pretreatment methods such as cleaning, etc., should be added to the dust test method(ES 01301.1). 3) The emission allowance standard of total hydrocarbons need to be subdivided according to the emission facility. 4) Approximately 90% of the air polluters were composed of fourto fine, so the measurement data of these small companies should be databaseed so that they can be utilized for the improvement and poliies of air discharge facilities. 본 연구는 2013년부터 2017년까지 광주지역 대기배출시설에서 배출되는 입자상물질과 총탄화수소의 주요 배출특성을 분석하여 입자상물질 측정과정 검토 및 총탄화수소 배출허용기준에 대한 평가를 하였다. 1) 대기배출시설의 배출유량을 측정한 결과, 실제 측정유량이 시설유량을 초과하는 차이가 있는 시설이 많았고, 실제유량의 정확한 측정을 위하여 측정구 위치 변경이나 시설개선이 필요하며, 측정유량이너무 적거나 유량이 측정되지 않을 경우에는 반드시 방지시설의 철저한 점검을 통한 운영이 필요하다. 2) 먼지측정용 원통여과지를 아세톤 세척 후 건조 등의 전처리 후 측정하면 원통여과지가 먼지 측정결과의 정확성을 높일 수 있어 대기오염공정시험기준 중 먼지(ES 01301.1)시험법에 여과지 세척 등에 대한 전처리내용을 추가 할 필요가 있다. 3) 총탄화수소의 배출허용기준은 배출시설에 따라 배출허용기준을 세분화 할필요가 있다. 4) 대기배출업체수의 약 90%가 4~5종으로, 이들 소규모업체의 측정자료를 데이터베이스화하여 대기배출시설의 개선 및 정책에 활용할 수 있도록 하여야 한다.
삼중효용 LiBr/물 흡수식 냉방기의 사이클 시뮬레이션
조광운,정시영,정은수 대한설비공학회 1998 설비공학 논문집 Vol.10 No.1
Basic design of a 50USRT(175㎾) triple effect absorption chiller driven by hot gas has been carried out for both parallel and series flow cycles. Parallel flow cycle showed higher COP, however, the temperature in the generator was also higher than that in series flow cycle. Dynamic operation behavior of a parallel flow system at off-design conditions, such as the change in heat transfer medium temperature or the construction change of the system components, has been investigated in detail. It was found that the cooling capacity was seriously decreased by reducing hot gas flow rate and UA-value in the high temperature generator. However, the system COP was improved, because thermal load in the system components was reduced. The COP and the cooling capacity was found to be improved as cooling water temperature decreased or chilled water temperature increased. The optimum ratio of solution distribution could be suggested by considering the COP, the cooling capacity and the highest temperature in the system, which is critical for corrosion.
소독방법에 따른 실내수영장 수질 특성 -브롬산염, 클로레이트, 염소이온을 중심으로-
조광운 ( Gwang Un Jo ),이세행 ( Se Haeng Lee ),위환 ( Whan Wi ),윤상훈 ( Sang Hoon Yoon ),김난희 ( Nan Hee Kim ),안상수 ( Sang Soo An ),정숙경 ( Suk Kyeong Jung ),김동수 ( Dong Su Kim ),조영관 ( Young Gwan Cho ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.2
This study was carried out to investigate the characteristics of water quality parameters in the indoor swimming pool water according to the type of disinfection. The method of disinfection has a on-site oxidant generation, sodium hypochlorite and artificial seawater electrolysis that the salt was put in the pool directly. The on-site oxidant generation and sodium hypochlorite in the disinfectant contain high concentrations of bromate and chlorate. The bromate and chlorate containing the disinfectant is the cause of detection in a swimming pool. Maximum concentration of bromate in swimming pool waters was 1.365 mg/L at on-site oxidant generation and maximum concentration of chlorate was 36.00 mg/L at sodium hypochlorite. Therefore, to reduce the concentration of bromate and chlorate in swimming pool water, it is necessary to use the disinfectant containing the less quantity of bromate and chlorate and to exchange of swimming pool water frequently.
조광운(Kwangwoon Cho),배종식(Jong Sik Bae),김학봉(Harkbong Kim),이재명(Jaemyeong Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
On this study, fan less air cooling system that use air inflow naturally driven by the high pressure on the front head lamp during driving and the radiator fan during idle was developed for the LED head lamp. The tube and duct let the inflow air from the inlet grille on front of headlamp to be separated from the air head lamp inside. It makes sure not for contamination and fog up on lens of headlamp. The duct and heat sink were made of one aluminum body to increase the heat transfer area and the rubber tubes were flexible enough for the headlamp aiming movement. The hose connected to radiator fan shroud was 30mm diameter for suction during idle. As a result, the fan less air cooling system could cool the led lower then 102℃ during both idle condition and driving. It shows the new cooling system can make the led headlamp system cost down.
정시영,조광운,이상수 대한설비공학회 2000 설비공학 논문집 Vol.12 No.5
The major irreversibilities in absorption chillers are associated with the transfer of heat into and out from the machine and irreversible process inside the machine. By modeling only external irreversibilities(endo-reversible), a model was formulated to predict the ideal performance of a single-effect absorption chiller. Its actual performance including both external and internal irreversibilities was calculated with a in-house simulation program. The optimization of heat transfer area distribution was performed for both endo-reversible cycle and actual cycle. The equation of endo-reversible modeling was found to give about 2times higher cooling capacity than the simulation program. At optimal distribution, it was found that heat transfer area of the evaporator was about 30% of total area, that of the generator was 20%, and the rest 50% was for the absorber and condenser. The system COP for endo-reversible cycle was slightly higher than that for actual cycle. In the case of LiBr-water single-effect absorption chiller, the maximum cooling capacity was obtained near the condition that LMTD is same at all heat exchangers.
광주지역 영산강 내 식물플랑크톤의 계절적 변동과 남조류 독소합성유전자의 계통발생학적 특성
김하람,조광운,손경록,장동,서광엽,김연희,Haram Kim,Gwangwoon Cho,Gyeongrok Son,Dong, Jang,Gwangyeob Seo,Yunhee Kim 한국환경과학회 2023 한국환경과학회지 Vol.32 No.5
Cyanobacteria have been used as pollution indicator species in freshwater ecosystems, and identifying their fluctuations can be an important part about management of surface waters globally. Cyanotoxins produced by cyanobacteria are directly or indirectly a threat to human and environmental health. In order to confirm the potential risk of these cyanotoxins, the fluctuations of phytoplankton and phylogenetic analysis of cyanotoxin synthetase genes were conducted at each point in the Yeongsan River water system in Gwangju from November 2021 to October 2022. Diatoms which grow well in winter were dominant at 99.4 ~ 99.5%, and diatoms and green algae were dominant from the spring to autumn when the water temperature rises. Stephanodiscus spp. were dominant at 92.7 to 97.5 % at all sites in the winter, and Aulacoseira spp., which grow in warm water temperatures, were dominant in summer and autumn. Microcystis aeruginosa was dominant at 25.2% in summer only at site 5. mcyB and anaC have been detected as cyanotoxin synthetase genes. The phylogenetic tree of anaC could be divided into two groups (Group 1 & Group 2). Group 1 contained Aphanizomenon sp. and Cuspidothrix issatschenkoi. It is combined with Aphanizomenon sp. and Cuspidothrix issatschenkoi, which are known to produce cyanotoxins.