http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
동절기 옥외 수영장 시설의 운영을 위한 바닥난방 성능평가 및 설계기준에 관한 사례연구
조진균(Jinkyun Cho),우경헌(Kyunghun Woo),김진호(Jin-Ho Kim) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.6
This study aimed to analyze the deck floor heating system of an outdoor swimming pool in terms of the thermal capacity/output and the surface temperature distribution based on the outdoor temperature, to design for anti-freezing during winter. Through the transient heat transfer simulation with PHYSIBEL and theoretical equations, the surface temperature distribution of the floor heating system at two outdoor conditions in Jeju, were calculated and evaluated. The results indicate that the specific thermal output required for maintaining 4℃ surface temperature at the design outdoor temperature of 0.1℃, was about 90 W/m². This performance analysis can be applied for future design criteria, including optimizations of system capacity and size.
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.
데이터센터의 합리적인 환경제어를 위한 공기분배 시스템에 대한 연구
조진균(Jin-kyun Cho),차지형(Ji-hyoung Cha),홍민호(Min-ho Hong),연창근(Chang-kun Yeon) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The cooling of data centers has emerged as a significant challenge as the density of IT server increases. Server installations, along with the shrinking physical size of servers and storage systems, has resulted in high power density and high heat density. The introduction of high density enclosures into a data center creates the potential for "hot spots" within the room that the cooling system may not be able to address, since traditional designs assume relatively uniform cooling patterns within a data center. The cooling system for data center consists of a CRAC or CRAH unit and the associated air distribution system. It is the configuration of the distribution system that primarily distinguishes the different types of data center cooling systems, this is the main subject of this paper.
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.
병원건물의 에너지 저감을 위한 에너지성능 평가에 관한 사례연구
조진균(Jinkyun Cho),문정환(Junghwan Moon),강호석(Hosuk Kang) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.1
Hospitals contribute to energy consumption and have a negative environmental impact. This study aims to find how meaningful energy performance, reflecting good energy management and design, can be planned for hospital buildings, a category encompassing complex buildings with different setups and large differences between them. Energy-consumption characteristics were surveyed throughout Korea to establish statistical energy models. Findings confirm that different hospital departments have hugely different energy-demand profiles. Energy efficiency and energy-saving potentials on HVAC systems are presented. The energy performance analysis can be applied to a wide range of problems in energy-system design and planning, including simulations and optimizations of community energy systems.
비상시 열원중단에 따른 데이터센터의 냉각시스템 열성능 평가에 관한 사례연구
조진균(Jinkyun Cho),강호석(Hosuk Kang) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.5
This study describes the analysis of a 20 MW chilled water plant used for the IT cooling of a recently constructed data center in Korea. The CFD model was developed with the aim of evaluating the impact of problems such as chiller failure on the water and air temperatures in the cooling system. The numerical model includes the chilled water hydraulic network and individual water-to-air CRAC units. The coupling between the IT server room air temperature levels and the cooling plant has enabled a full assessment of the cooling system design in response to system fault conditions to be performed. The paper examines an emergency situation involving the failure of the cooling plant, and shows how the inherent thermal inertia of the system along with additional inertia achieved through buffer systems allowed a suitable design to be achieved.
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.
최적 IT 환경제어를 위한 데이터센터의 냉각(열원)시스템 선정에 관한 연구
조진균(Cho Jin-Kyun),정차수(Jeong Cha-Su),김병선(Kim Byung-Seon) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.12
Today's data centers require precise, stable environments for sensitive IT equipments to operate optimally. As the latest computing equipment becomes smaller and uses the same or even more electricity than the equipment it replaced, more heat is being generated in data centers. There are 4 basic ways to collect and transport heat from the IT environment to the outdoor environment such as air cooled systems, glycol cooled systems, water cooled systems and chilled water systems. Each method uses the refrigeration cycle to transport or pump heat. When designing or selecting cooling system of data center, the existing facility infrastructure, the total power level of the installation, the geographical location, the physical constraints of the building and initial installation/operating costs should also be considered. In this research, the design parameters and economical aspects of cooling system were studied with the largest multi-megawatt data center that is recently completed in Korea. Energy simulation analysis was carried out in order to compare the energy consumption combined with four basic cooling systems by TRNSYS simulation program and energy saving effects of water-side economizer systems are reviewed. A method for planning and design of the appropriate cooling system was described. IT professionals versed in precision cooling mechanisms, components and configurations can work more effectively with HVAC/cooling engineers to ensure the specification and design of optimized cooling solutions.
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.