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윤석구(Suk Goo Yoon),박진철(Jin Chul Park) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
지역난방을 이용하며, 4개동 332 세대와 부대시설로 이루어진 목동의 w아파트공용부에 2관식의 통합배관시스템을 적용한 배관 성능개선 사업을 실시한 결과 기존 4관식으로의 발주 예상 대비 공용부 급수. 급당. 난방 배관공사비를 28.6% 줄일 수 있었고, 2년간의 에너지 사용을 모니터링 한 결과 2013 년도 대비, 2015 년도와 2016 년도의 에너지 절감 율이 각각 14.6 %. 12.7 %, 2년 평균 13.7 %의 에너지를 절감하였음을 확인하였다. 이는 2년 평균 38.6%의 공용부 열에너지 손실이 감소되었기 때문이다. 또한 LCC 분석결과 해당 아파트는 통합배관 시스템을 운영함으로서 20년간 총 2,157,000,000원을 절감해 단위 세대에 20년간에 걸쳐 매년 약 650만원의 절감효과가 있을 것으로 기대되었다. 한편 통합배관을 통한 에너지 절약을 위해서는 유용한 통합배관 유닛의 선정이 필수인데 연구에서는 이를 위해 개발한 직렬형의 통합배관 세대 유닛이 사용되었다.
습식 및 온수 바닥 복사 난방 시스템에서 PCM 적용을 위한 상변화온도 영향 분석
백상훈(Sang-Hoon Baek),윤석구(Suk-Goo Yoon),박진철(Jin Chul Park) 한국생활환경학회 2018 한국생활환경학회지 Vol.25 No.1
This study aims to design the PCM radiant floor heating system and to calculate optimal temperature of the PCM. The results of this study is as following. A existing radiant floor heating system have some problems to use a lot of hot water and energy owing to low heat storage performance of autoclaved lightweight concrete and mortar. for this problem, this study suggested the design of PCM radiant floor heating system applied to PCM, which is a heat storage material. The PCM radiant floor system consists of 210 mm concrete slab, 20 mm cushioning material, 15 mm mortar, 10 mm PCM aluminum case, 55 mm mortar, and a finishing material. It was analyzed that the PCM temperature (Melting point) scope for the PCM radiant floor heating system is 32-39℃ through the heat transfer model if a finishing material of 5 mm thickness is used.
Numerical study on the effects of nozzle geometry and substrate location in the supersonic flow
박정재(Park, Jung Jae),윤석구(Yoon, Suk Goo),김호영(Kim, Ho Young) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
This paper deals with the simulation of solid particle coating technology via supersonic nozzle in vacuum environment to devote as an aerosol-deposition device. In order to improve efficiencies of nozzle and coating process, effects of shockwave, nozzle geometry, and substrate location were studied computationally under a fixed chamber pressure of 0.01316 bar which is nearly vacuous. Shockwave is the important factor affect to entire flow because shockwave in the jet flow dissipates the kinetic energy of the flow in the supersonic condition. Results show that various nozzle geometries have significant effect on the supersonic flow and we know that the supersonic nozzle should be optimized to minimize the loss of the flow. Another parameter, the distance between substrate and nozzle tip, shows little effect in this study.
미분탄 입자의 크기 차이와 배열이 연소특성에 미치는 영향
김기덕(Ki Duck Kim),김호영(Ho Young Kim),조종표(Chong Pyo Cho),윤석구(Suk Goo Yoon) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
The laminar combustion characteristics of interacting coal particles in a convective flow are numerically investigated at particle arrangement and size difference. The numerical simulations, which use the two-step global reaction model to account for the surrounding gas effect, show the detailed interaction among the inter-space particles, undergoing devolatilization and subsequent char burning. Several parametric studies, which include the effect of the gas temperature (1700 K), high pressure(10 atm) and variation in geometrical arrangement of the particle diameter on the volatile release rate and the char combustion rate, have been carried out. The comparison indicates that the shift to the multiple particle arrangement resulted in the substantial change of the combustion characteristics and that the volatile release rate of the interacting coal particles exhibits a strong dependency on the particle spacing and size difference.
액체 연료 액적들의 배열 및 크기차이가 증발 및 연소특성에 미치는 영향
이동조(Dong Jo Lee),김호영(Ho Young Kim),조종표(Chong Pyo Cho),윤석구(Suk Goo Yoon) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
The burning characteristics of interacting droplets with internal circulation in a convective flow are numerically investigated at various particle arrangement and size difference. In this simulation some conditions are fixed, surround gas temperature is 1250K, pressure is 10 atm and drolet's initial temperature is 300K. The transient combustion of arranged droplets, the fixed droplet distances of 4 radii to 20 radii horizontally, is studied. And the range of size of droplet is 75㎛ to 100㎛. The results obtained from the present numerical analysis reveal that the transient flame configuration and retardation of droplet internal motion with the horizontal spacing substantially influence lifetime of interacting droplets. At a Reynolds number 10, lifetime of the three droplets with decreasing horizontal droplet spacing increases monotonically. But when droplet spacing decreases further to 4radii, Lifetime of interacting droplets are increase. So Lifetime of interacting droplets exhibits a strong dependence on the horizontal droplet spacing and size difference. It can be investigated well with these conditions to that of single burning droplet.
스월 노즐의 Air-core가 Diesel 및 Bunker A 유의 분무 불안전성에 미치는 영향에 관한 실험적 연구
이은재(Eun Jae Lee),김호영(Ho Young Kim),전철균(Chul Kyeun Chun),윤석구(Suk Goo Yoon),김기덕(Ki Duk Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Most of all combustion system has combustion instability. It is a serious problem in combustion system. Unstable injection is one of the source of combustion instability. The experimental investigation of spray characteristics for simplex swirl injector were conducted experimentally. Two kerosene based fuels were chosen as the atomizing fluid. As the major operating parameters, fuel temperature and injection pressure were chosen, and varied in the range from 283 K to 363 K and from 0.3 ㎫ to 0.9 ㎫, respectively. Direct spray images and mean diameter were measured for the various combination of operating parameters in the flow field. The results of present study show that the injection pressure and spray cone angle are fluctuated at specific conditions while it is continuous steady injection, and the principal factor is developing air-core. As developing air-core, the area of orifice is changed, then injection pressure and volume flow rate is varied, and as fully-developed air-core, spray is stability.