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자연환기 계획을 위한 국내 초고층 공동주택 커튼월의 창호유형 사례분석 및 환기창 성능분석에 관한 연구
조진균(Cho Jin-Kyun),홍민호(Hong Min-Ho),유창우(Yoo Chang-Woo) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.4
When solar heat gain is not discharged outside the building due to a stagnant ventilation flow and lack of shading devices, the indoor environment of residents becomes worse, and the cooling of high-temperature products is delayed. The aim of this paper is to introduce a study which has been applied for the determination of the appropriate building envelope and window type from the cooling energy reduction viewpoint. The method used in this study comprises the analysis of building envelope and window type aspects of natural ventilation and shading device design criteria by quantitative data, surveyed case study of 114 high-rise residences that have above twenty stories in Korea. 11 curtain-wall types in this research were classified according to openable window location of vision part of building envelope. To calculate the open area ratio of windows use of openable window types' coefficient of discharge that classified by open method. CFD simulation analysis was carried out in order to compare the natual ventilation efficiencies of various window systems. The information presented here is a foundation allowing architects and professionals to successfully design the building envelope and window systems for improvement of natural ventilation and reduction of building cooling load.
고밀도 내부부하 중심 건물의 에너지 절약적 공조방식에 대한 연구
조진균(Jin-Kyun Cho),정차수(Cha-Su Jeong),김병선(Byung-Seon Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.8
With the advancement of technology, the density of IT equipment, heat load and power consumption continue to increase in high density internal-load dominated buildings as datacenters. To improve the HVAC system’s energy performance and efficiency, there is a need to find methods of using outside air. Through cooling tower control that is based on outside wet-bulb temperature, the water-side economizer made it possible to achieve a maximum energy performance improvement of about 16.6% over the basic chilled water system, whereas the air-side economizer, through control based on outdoor air enthalpy, made it possible to achieve about 42.4% improvement.
저온온수 모세유관 바닥복사 난방시스템의 성능에 관한 실험적 연구
조진균(Jinkyun Cho),박병용(Beungyong Park),이용준(Yongjun Lee),정원호(Wonho Chong) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.2
Radiant floor heating systems with capillary tubes are energy saving systems in which hot water is circulated into capillary tube with a small diameter. In this study, the heating performance of capillary tube system is investigated in an experimental study and a simulation model. The results of the study showed that, the capillary tube radiant floor heating system maintains a more stable floor surface temperature in comparison a PB pipe system. In terms of energy consumption, the capillary tube radiant floor heating system proved to be more efficient than the PB pipe heating system at 40℃ of low temperature hot water supply. The difference between water temperature and room temperature can be held low for heating which saves energy. Low temperature radiant floor heating system with capillary tubes have significant advantages such as health improvement, low energy cost, optimum use of heat source(boiler) and higher operational efficiency.
COVID-19 대응 비접촉 모듈러 선별진료소 개발 및 성능검증
조진균(Jinkyun Cho),송종운(Jongwoon Song),배상환(Sang Hwan Bea) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
With the ongoing COVID-19 pandemic, the number of individuals that need to be tested for COVID-19 has been rapidly increasing. Temporary or mobile screening/testing centers are being widely utilized in response to outbreaks and epidemics. Temporary screening centers are being widely utilized in response to outbreaks and epidemics. However, there is a risk of cross-infection at each stage of screening treatment, including the booths, and adverse reactions with disinfection of the booths. A non-contact modular screening center (NCMSC) using negative pressure booths with the biosafety cabinet has been developed and implemented for safe, fast and easy screening of COVID-19. The NCMSC increases patient access to the screening clinics and adequately protects healthcare personnel while reducing the consumption of personal protective equipment. It can also increase the number of people tested. In this study, the NCMSC was investigated experimentally for cross-infection prevention effects. Image processing based laser-diagnostics techniques including particle image velocimetry (PIV) was employed to characterize flow dynamics in the NCMSC by taking advantage of the state-of-the-art high-speed cameras and an infrared (IR) camera.
고밀도 데이터센터의 에너지 저감을 위한 공조효율 평가방법에 관한 연구
조진균(Cho, Jin-Kyun),박우평(Park, Woo-Pyoung),신승호(Shin, Seung-Ho) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.6
The goal of air management system of high-density data centers is to minimize re-circulation of hot air and minimize by-pass of cold air in the IT server room. Successfully implemented, both measures result in energy savings and better thermal conditions. Air management helps reduce operating costs by enhancing economizer utilization, improving cooling system efficiency. Metrics play an important role in providing a measure of the performance of air management systems. Performance indices include the Supply/Return Heat Index(SHI/RHI), the Rack Cooling Index(RCI) and the Return Temperature Index(RTI). CFD simulation estimates temperature, airflow in the data center and provides a wealth of information for evaluating cooling efficiency. This study describes four performance metrics for analyzing air management systems. They were computed with CFD modeling to evaluate the thermal environment in a typical data center module and 46 different design alternatives. In this paper, advanced and comprehensive evaluation index of cooling efficiency was also derived and well-crafted metrics will undoubtedly play an important role.
고밀도 데이터센터 구역단위 냉각시스템 실증연구: 독립모듈 컨테인먼트 및 냉각시스템 성능평가
조진균(Jinkyun Cho),박병용(Beungyong Park),정용대(Yongdae Jeong) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Owing to the rapid growth of information technology (IT) services over the past decade, such as mobile telecommunication, Internet of Things, big data, and cloud computing, data centers have become the core infrastructure for Industry 4.0. Meanwhile, the energy use of data centers has increased rapidly. In this study, a modular air containment prototype was developed for optimal row-based cooling system for high-density data centers. The main purpose is to evaluate the cooling performance of hybrid(refrigerant-water cooled type) in-row coolers in an independent row-based air containment. The differences and technical features of this in-situ experimental study is that rated cooling performance of hybrid in-row cooling system was evaluated based on the full IT load conditions. The hybrid in-row cooling system was found to be the better efficient in removing heat output of IT equipment based on the observations and experimental results.
교차감염 방지를 위한 비접촉 감염병 선별진료소 평가에 관한 연구 - 환기시스템에 의한 바이러스성 에어로졸 제거효과를 중심으로 -
조진균(Cho, Jinkyun),김진호(Kim, Jinho) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.10
In this study, to fundamentally solve the risk of cross-infection in screening centers responding to infectious diseases, a new non-contact screening center was developed that supplemented the problems of existing screening centers. Numerical analysis was performed on the effectiveness of a ventilation system to remove viral aerosols and prevent cross-infection. Moreover, full-scale field measurements and SF6 tracer gas simulating viral aerosol was used under the same conditions as it was for the numerical analysis, comparison, and verification when CFD simulations were performed. Currently, COVID-19 screening centers operating in Korea can be divided into five types; the risk of cross-infection is very high due to its structure where the movement of medical staff and suspected patients cannot be separated. As a result of the CFD simulation on the ventilation system of a non-contact screening center, among the 3,000 particles generated from a patient, not a single particle was transmitted from the specimen collection booth to the adjacent examination room. More than 99% of the particles were removed by the ventilation system after 559 seconds. As a result of the in-situ measurement, the concentration of SF6 gas generated in the specimen collection booth was effectively reduced by the ventilation system. Additionally, the SF6 gas was not detected in the examination room due to the maintenance of an appropriate differential pressure.
제로에너지 건축물 구현을 위한 에너지 융 · 복합시스템의 기술정의 및 시장현황
조진균(Jinkyun Cho),김진호(Jinho Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
The renewable energy based convergence-integration system have been developed for zero energy buildings and their energy systems especially when generation-consumption variables need to be optimized. However, these methods ignore the interactions between building passive design and active system optimizations. In this study, energy convergence-integration systems coordinated multi renewable energy system and building active system is defined as a computation cost-effective method for stand-alone and grid connected zero energy buildings to effectively consider the interactions between building design and energy system optimizations. This paper provides basic technical information and extend scopes of energy convergence-integration system as well as support policy for zero energy building development in Korea. The aspects include the energy and cost impact as well as the energy matching and the convergence-integration system interactions.
사무소 건물의 HVAC&R 시스템 에너지 분석방법 및 예측 프로그램 개발
조진균(Jinkyun Cho),신승호(Seungho Shin),김종헌(Jonghurn Kim),황동곤(Dongkon Hwang),홍희기(Hiki Hong) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.7
HVAC&R systems are the most energy consuming building services, representing approximately half of the final energy use in the building sector. Despite their significant energy use, there is a lack of a consistent and homogeneous framework to efficiently guide research. This research is about the energy consumptions of HVAC&R systems, with the aim of establishing a common idea for the analysis of building energy efficiency. Our approach deals with the concept of an HVAC&R set that is composed of subsystems. A matrix combination evaluation is examined, and a total of 960 sets can be implemented in a large scale office building. A method as a tool for energy evaluations of HVAC&R systems, and HEET as a energy simulation program, were developed.