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역삼투막 공정에서 비산화성 살균제 주입 개선을 통한 미생물 증식 억제효과 향상
박덕준 ( Duk Joon Park ),오은정 ( Eun Jung Oh ),강은희 ( Eun Hee Kang ),김병군 ( Byung Goon Kim ),김홍석 ( Hong Suck Kim ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.1
RO membrane`s surface that accumulated biofilm(biofouling) is removed by disinfectant(biocide). Usually biocide for RO`s biofouling removal uses oxidizing biocide(NaOCl) and non-oxidizing biocide. At the condition that have a high concentration of biofilms was more removed by only using the non-oxidizing biocide on the RO membrane surface than using both oxidizing and non-oxidizing biocide. Also the single use of non-oxidizing biocide enhanced operating time of RO membrane and that reducing differential pressure`s rising and minimizing the operating cost by the stop using RO`s Chemicals ; NaOCl and NaHSO<sub>3</sub>.
살균에 박리 및 분산 기능이 추가된 친환경살균제에 대한 역삼투(RO)막에서의 효과 검증 연구
박덕준(Duk Joon Park),오은정(Eun Jung Oh),김성한(Sung Han Kim),안광택(Kwang Taek Ahn) 대한환경공학회 2016 대한환경공학회지 Vol.38 No.9
살균기능에 박리와 탈리기능 추가된 비유독물인 친환경살균제를 역삼투(RO)막 부착된 유기물 등 오염물질 제거를 위하여 현장 적용시 역삼투막 차압증가 도달시간을 기준 적용시 평균 93.0%의 개선효율을 보였다, 또한 친환경살균제를 사용한 역삼투막을 Autopsy한 결과, 무기 및 유기오염의 비율이 기존살균제에 비하여 친환경살균제를 사용한 역삼투막이 유기오염의 비율이 적은 것으로 조사됨에 따라 친환경살균제의 바이오필름 제거(분산, 박리) 및 살균력이 기존 약품보다 우수한 것으로 확인되었다. Eco-friendly biocide that do not have noxious chemicals, have a role of disinfection adding of dispersion and strengthening peer power on RO membranes surfaces. Eco-friendly biocide show an 93% improvement of differential pressures arrival time. Also, eco-friendly biocide’s Autopsy result show less the percentage of organic pollutants than currently in using biocide. Adding dispersion & peeling strength power to remove the microorganisms is upgrading. Eco-friendly biocide that have a dispersion and peering power is non-toxicant chemicals and is safe for user.
스마트팜 적용 피복재의 시험을 통한 성능평가 및 냉방부하 분석
박두용(Doo Yong Park),이현제(Hyun Je Lee),박덕준(Duk Joon Park),최슬건(Sul Geon Choi) 대한설비공학회 2022 설비공학 논문집 Vol.34 No.2
The thermal performance database of the covering material which can be used as input data for the smart farm cooling load simulation performance evaluation was analyzed through the test evaluation. Methods: The solar heat gain coefficient of the covering materials (PE, PMMA, PC double layer, woven film) was compared and analyzed through the Korean standard test method and input data was derived. Based on the thermal input data, the cooling load simulation of smart farm was conducted and the simulation performance evaluation of each case was performed to analyze how the indoor cooling load changes by covering materials. Results: The cooling load of the PC double layer was the lowest at 424 W/㎡, and the PE film was the highest at 559 W/㎡. The coefficient of heat transmission was 3.7 W/㎡ ·K~6.7 W/㎡ ·K for each covering materials, and the solar heat gain coefficient was evaluated as 54%~90% visible transmittance was 50%~88%. The cooling load of the PC double layer and PE film showed a difference of 135 W/m2(24%), indicating that the selection of the coating material greatly affects the cooling load. The cooling load was reduced by 25.3% when the cooling setpoint temperature was controlled, and the cooling load was reduced by 35.8% when the internal shading rate was applied by 60%.
건축물의 에너지절약설계기준 강화에 따른 업무용 건물의 에너지성능 개선 효과
김지혜(Kim, Ji-Hye),성제은(Sung, Jea-Eun),김혜기(Kim, Hye-Gi),박덕준(Park, Duk-Joon),김선숙(Kim, Sun-Sook) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1
Building energy codes are widely used worldwide as a key policy tool for improving building energy efficiency by defining the minimum requirement for the energy performance of new buildings. In Korea, the building energy code includes prescriptive criteria such as U-value requirements for each building component by climate zones and EPI (Energy performance index) as well as performance criteria for primary energy use. The purpose of this study is to suggest the direction to revise building energy code based on the analysis of improvement in energy performance of buildings according to its evolution over the past 20 years. The energy needs and primary energy uses were calculated for three office buildings and four cities. An increasing trend of energy performance was found with the reinforcing of the code, and some recommendations for future revision were suggested.