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지하철 역사 내 실내 공기질 개선을 위한 정전분무 공기청정기의 성능평가
이강산(Kang-San LEE),박준수(Junsu PARK),이길봉(Gilbong LEE),이계중(Kye Jung LEE),조민정(Minjeong CHO),이미혜(Meehye LEE),최종원(Jongwon CHOI) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
지하철 역사 내부에서 발생하는 대표적인 실내공기 오염물질로는 미세먼지, 부유세균, 그리고 휘발성 유기화합물이 있다. 각각의 오염물질을 처리하기 위해서는 필터를 이용한 여과시스템, UV-C를 이용한 살균시스템, 광촉매를 이용한 산화시스템 등 별도의 독립적인 시스템을 도입해야하므로, 높은 설치비용 및 유지 보수비용에 소비자는 부담을 느낄 수 있다. 따라서 본 연구에서는 미세먼지, 부유세균, 휘발성 유기화합물을 동시에 저감시킬 수 있는 물을 이용한 정전분무 기술을 제안한다. 정전분무 시 생산되는 높은 하전을 띈 미세 물 액적은 미세먼지와 직접 충돌 및 전기적 인력에 의한 간접 충돌로 인해 높은 효율로 미세먼지를 집진할 수 있다. 한편, 물을 이용한 정전분무 시 생성되는 수산화 이온은 높은 전기장 환경에서 에너지를 받아 수산화 라디컬로 변함과 동시에 2개의 수산화 라디컬이 반응을 일으켜 과산화수소가 된다. 이렇게 생산된 과산화수소수와 공기 내 산소가 오존으로 변한 이후 물에 흡수된 오존수는 부유세균의 살균과 휘발성 유기화합물의 산화를 유도한다. 본 연구에서는 이러한 가설을 검증하기 위해 정전분무 공기청정기 시작품을 제작하여 서울 지하철역 플랫폼에 적용하여 성능을 평가하였다. 연구 결과 공기청정기 입출구 사이의 PM10, PM2.5, PM1.0의 집진효율은 각각 99.1, 98.7, 93.5%로 측정되었으며, 장시간 운전 결과 지하철 역사 내 미세먼지는 약 40% 가량 저감되는 것을 확인하였다. 또한, 공기청정기 입출구 사이의 총 부유세균은 99.9% 이상, 총 휘발성 유기화합물은 95% 이상 저감시키는 것을 확인하였다.
이욱현(Wook-Hyun Lee),이기우(Ki-Woo Lee),이영수(Young-Soo Lee),전원표(Won-Pyo Jeon),박기호(Ki-Ho Park),이계중(Kye-Jung Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, we have manufactured the flat plate heat pipe with different square modules ; different hight(10㎜, 5㎜) and width(30㎜, 20㎜), and investigated the operating characteristics of flat plate heat pipe experimentally. Water was used as a working fluid. Fill charge ratio and heat flux was changed(10-40 vol.%, 10-45W). Surface temperature, inner saturated temperature and pressure were measured. Experiment was conducted in condition of nature convection and thermal resistance was showed as representative index for heat transfer performance. Optimal module type was selected and minimum surface temperature difference ranged 0.3~1.1℃ when average surface temperature ranged 70~150℃
이욱현(Wook-Hyun Lee),이기우(Ki-Woo Lee),전원표(Won-Pyo Chun),박기호(Ki-Ho Park),이계중(Kye-Jung Lee),이석호(Seok-Ho Rhi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Loop heat pipe is a very reliable and versatile heat transport system which makes it possible to considerably extend the capability of two phase heat transfer devices with a capillary pumping force. In this study, heat transfer characteristics of the loop heat pipe at the vertical mode was investigated through the fabrication of practical heat sink models. Heat sink model basically consist of the separated vapor/liquid channels, evaporator having sintered ceramic wick and condenser cooled by air, water and ammonia were used as the working fluid.
스크린메쉬윅 히트파이프에서 윅의 기공율변화에 따른 열수송한계의 이론적 고찰
이기우(Ki Woo Lee),박기호(Ki Ho Park),전원표(Won Pyo Chun),이욱현(Wook Hyun Lee),이계중(Kye Jung Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The purpose of the present study is to investigate the capillary hear transportation limitation in heat pipe according to the change of screen mash wick porosity. Diameter of pipe was 6mm, and mesh numbers are 100, 150, 200 and 250 and water was selected as a working fluid. According to the change of wick porosity and mesh number, the capillary pressure, pumping pressure, liquid friction coeffcient in wick, vapor friction coefficient, and capillary heat transportation limitation are analyzad by theoretical desigm method of a heat pipe. As some results, the capillary heat transportation limitation in screen mesh wick heat pipe is largely affected by wick porosity and mesh namber.
제지건조기용 실린더드럼의 다중유로내의 응축수배출에 관한 이론적 연구
이기우(Ki Woo Lee),전원표(Won Pyo Chun),이계중(Kye Jung Lee),장석필(Seok Pil Jang),최웅소(U.S. Choi),하재청(Jae-Cheong Ha) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The heat transfer process in the cylinder drum for paper drying consists of the thermal resistances by condensate thickness, thickness of shell, and the contact resistance between cylinder and canvas. The most thermal resistance in conventional cylinder drum is generated by condensate, which is specially increased by the increase of revolution per minute (RPM). In this paper, the condensate removal in the cylinder drum, w hich multi-flow channel is attached to the inside surface of cylinder, was analyzed. The maximum RPM of cylinder drum was exam ined for removing the condensate in multi-flow channel by steam pressure without siphon. Steam pressure, channel height, RPM, gap between cover plate and separate plate of steam and condensate and centrifugal force in channel and gap were examined as variables.
사이폰없는 실린더드럼에서 다중유로에 의한 응축수배출에 관한 실험적 연구
이기우(Ki Woo Lee),전원표(Won Pyo Chun),이계중(Kye Jung Lee),하재청(Jae Cheong Ha) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
Cylinder drum dryer tor paper drying is the method which drys the wetted paper flowing on surface of drum by steam. The condensate, which the steam transfers the heat to the surface of drum for paper drying and is condensed, must be removed for continuous drying. In this paper, the condensate removal and heat transfer characteristics were experimented according to steam pressure, revolution of drum and height of flow channel by multi-f1ow channel in cylinder drum without syphon. And these heat transfer characteristics were compared with the case of conventional type with syphon for condensate removal. As the experimental results, the minimum steam pressure existed for the removal of condensate by steam pressure without siphon, and heat transfer quantity in cylinder drum with multi-flow channel was approximately increased to 28% compared to conventional drum. Accordingly, application effect on this technology was expected to be great, but a lot of steam was exhausted with condensate, so this problem must be improved for the commercialization of cylinder dryer with multi-t1ow channels.